Log in

Relevant bibliographies by topics / Self Phase Modulation (SPM) / Journal articles

To see the other types of publications on this topic, follow the link: Self Phase Modulation (SPM).

Journal articles on the topic 'Self Phase Modulation (SPM)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Self Phase Modulation (SPM).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Nain, Abhimanyu, and Suresh Kumar. "Performance Investigation of Different Modulation Schemes in RoF Systems under the Influence of Self Phase Modulation." Journal of Optical Communications 39, no. 3 (June 26, 2018): 343–47. http://dx.doi.org/10.1515/joc-2016-0155.

Full text

Abstract:

Abstract The Radio over Fiber (RoF) system has emerged out a promising solution to the last mile connectivity along with higher data rates making it the preference for future communication networks. But fiber nonlinearities induce crosstalk and degrade the performance of the system. This paper presents a simulative investigation & comparison of Mach Zehender Modulator (MZM) and Optical Phase Modulator (OPM) including the effects of Self Phase Modulation. A single channel RoF system has been designed using MZM and OPM respectively. The model is analyzed for different ranges of dispersion and input channel power. It is observed that as the dispersion modulus increases the SPM induced pulse broadening also increases. The pulse broadening also increases with increase in the channel input power. Further it is revealed that MZM offers 0.3 dB more channel output power compared to OPM when dispersion is increased from 2 to 10 ps/nm/km. With the increase in channel input power from 10 to 17.5 dBm, OPM suppress SPM effects better than MZM and provides 2 dB more channel output power.

APA, Harvard, Vancouver, ISO, and other styles

2

Supe, A., and J. Porins. "Methods for Estimation of Optical Fiber Non-Linearity Using Self-Phase Modulation Effect." Latvian Journal of Physics and Technical Sciences 48, no. 6 (January 1, 2011): 29–40. http://dx.doi.org/10.2478/v10047-011-0037-2.

Full text

Abstract:

Methods for Estimation of Optical Fiber Non-Linearity Using Self-Phase Modulation Effect Due to ever increasing channel density in WDM systems the nonlinear optical effects in fibers become a limiting factor for the high-speed data transmission, which necessitates determination of such important characteristic as the coefficient of optical nonlinearity. To measure it, two methods are proposed: continuous wave self-phase modulation (CW-SPM) and pulse phase self-modulation (P-SPM). The research work has been carried out both in the form of calculations and experimentally, taking as wavelength the central one from the third optical transparency window, λ = 1550 nm. Based on the OptSim 5.2 simulations and experimental results, the sought-for nonlinear coefficients have been calculated. In the paper, comparative analysis and estimation of the results are performed for two different optical fibers.

APA, Harvard, Vancouver, ISO, and other styles

3

Dabas, Bhawana, Jivesh Kaushal, Monika Rajput, and R. K. Sinha. "Study of Self Phase Modulation in Chalcogenide Glass Photonic Crystal Fiber." Applied Mechanics and Materials 110-116 (October 2011): 53–56. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.53.

Full text

Abstract:

In this paper, Self Phase Modulation (SPM) in chalcogenide As2Se3glass Photonic Crystal Fiber (PCF) is numerically studied by combining the fully vectorial effective index method (FVEIM) and Split Step Fourier Method (SSFM). The FVEIM is used to calculate the variation of effective refractive index of guided mode (neff), effective area (Aeff), dispersion and non-linear coefficient (γ) with wavelength for different designs of chalcogenide As2Se3PCF. The FVEIM solves the vector wave equations and SSFM solves non linear Schrödinger Equation (NLSE) for the different designing parameter of As2Se3PCF. In case of Self Phase Modulation (SPM), spectral width of the obtained output pulse at d/Λ=0.7 is 1.5 times greater than width of the output pulse obtained at d/L=0.3 using SSFM. Thus we can get the desired spectral broadening just by tailoring the design parameters of the PCF.

APA, Harvard, Vancouver, ISO, and other styles

4

Xu, Su Xiao, Li Zhou, and Jing Xiao. "40 Gb/s Optical 3R-Regeneration Based on XPM and SPM in PCF." Advanced Materials Research 571 (September 2012): 180–84. http://dx.doi.org/10.4028/www.scientific.net/amr.571.180.

Full text

Abstract:

A scheme to achieve 40Gb/s all-optical 3R-regeneration through cross-phase modulation and self-phase modulation is studied in this paper. The core of the scheme is to use ultra-highly nonlinear photonic crystal fiber as the Mach-Zehnder interference of one arm. Length of the photonic crystal fiber at the arm is adjusted after calculation so as to make the signal light through the arm produce nonlinear phase shift of by means of XPM effect, then mutual interference between the resulting light and the optical signal at the other arm is generated and the noise interfusing the system is eliminated to make the signal be regenerated. Furthermore, self-phase modulation effect of the fiber is applied to make further optimization of the signal, with Optisystem for simulation experiment.

APA, Harvard, Vancouver, ISO, and other styles

5

Gu, Mingming, Aman Satija, and Robert P. Lucht. "Effects of self-phase modulation (SPM) on femtosecond coherent anti-Stokes Raman scattering spectroscopy." Optics Express 27, no. 23 (November 6, 2019): 33954. http://dx.doi.org/10.1364/oe.27.033954.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Muñoz Castro, Geovanny Andrés. "DWDM Networks When Using Raman Configurations with DCF Fibers." Sistemas y Telemática 15, no. 41 (August 1, 2017): 27–43. http://dx.doi.org/10.18046/syt.v15i41.2454.

Full text

Abstract:

In this paper, the basic theoretical foundations regarding a DWDM [Dense Wavelength Division Multiplexing] network when using Raman configurations with DCF [Dispersion Compensation Fiber] are studied, through the revision of: linear effects, such as noise, loss, chromatic dispersion and PMD [Polarization Mode Dispersion]; and nonlinear effects, such as Self-Phase Modulation [SPM], Cross-Phase Modulation [XPM] and Four-Wave Mixing [FWM], compared to Optical Monitoring Parameters [OPM].

APA, Harvard, Vancouver, ISO, and other styles

7

Huszaník, Tomáš, Ján Turán, and Ĺuboš Ovseník. "Mitigation of Fiber Nonlinear Effects in 1.28 Tbps DQPSK Modulated DWDM System." Electronics ETF 23, no. 1 (September 20, 2019): 3. http://dx.doi.org/10.7251/els1923003h.

Full text

Abstract:

The main limitation factor of high capacity multichannel DWDM (Dense Wavelength Division Multiplexing) systems are fiber nonlinear effects. The optical signal is severely degraded due to fiber nonlinear effects also known as Kerr fiber nonlinearity. Nonlinear effects under investigation are self-phase modulation (SPM) and cross-phase modulation (XPM). There are several methods to compensate these nonlinear distorts, some less or more effective. Nonlinear distort due to SPM and XPM can be effectively mitigated through implementation of optical DQPSK modulation over commonly used intensity modulation known as OOK (On-Off Keying). This paper presents a numerical simulation model of 1.28 Tbps DWDM system with optical DQPSK modulation. We present several scenarios and methods to mitigate fiber nonlinear effects including Fractional Fourier Transform (FrFT). Linear and nonlinear effects are considered together, so we implement the inline FrFT module in the optical domain which causes a time-frequency plane rotation to mitigate combined linear and nonlinear effects. The performance of proposed 1.28 Tbps DQPSK modulated DWDM system is evaluated in term of bit error rate (BER) and Q factor value.

APA, Harvard, Vancouver, ISO, and other styles

8

Abdel-Gawad, H. I. "Chirped, breathers, diamond and W-shaped optical waves propagation in nonself-phase modulation medium. Biswas–Arshed equation." International Journal of Modern Physics B 35, no. 07 (March 20, 2021): 2150097. http://dx.doi.org/10.1142/s0217979221500971.

Full text

Abstract:

Self-phase modulation (SPM) induces a varying refractive index of the medium due to the optical Kerr effect. The optical waves propagation (OWP) in a medium with SPM occupied a remarkable area of research in the literature. A model equation to describe OWP in the absence of SPM was proposed very recently by Biswas–Arshed equation (BAE). This work is based on constructing the solutions that describe the waves which arise from soliton-periodic wave collisions. A variety of geometric optical wave structures are observed. Here, a transformation that allows to investigate the multi-geometric structures of OW’s result from soliton-periodic wave collisions is introduced. Chirped, conoidal, breathers, diamond and W-shaped optical waves are shown to propagate in the medium in the absence of SPM. The exact solutions of BAE are obtained by using the unified method, which was presented recently. We mention that the results found here, are completely new.

APA, Harvard, Vancouver, ISO, and other styles

9

Sampath, K. I. Amila, Katsumi Takano, and Joji Maeda. "Peak-to-Average Power Ratio Reduction of Carrier-Suppressed Optical SSB Modulation: Performance Comparison of Three Methods." Photonics 8, no. 3 (February 26, 2021): 67. http://dx.doi.org/10.3390/photonics8030067.

Full text

Abstract:

We compare the performances of three previously proposed methods to reduce the peak-to-average power ratio (PAPR) of the carrier-suppressed optical single-sideband (OSSB-SC) signal. PAPR of OSSB-SC signal becomes high due to the peaky Hilbert-transformed signal which is used for spectral suppression. Nonlinear phase shifts induced by high PAPR degrade OSSB-SC signal during fiber transmission. Previously, we proposed peak folding, peak clipping, and high-pass Hilbert transform methods to reduce the PAPR of OSSB-SC modulation. In this study, we numerically compare the effectiveness of proposed methods in a 10 Gbit/s non-return-to-zero (NRZ)-coded 100-km single-channel transmission link. Due to the reduced PAPR, peak folding and peak clipping can increase the self-phase modulation (SPM) threshold of the studied system by 2.40 dB and 2.63 dB respectively. The high-pass Hilbert transform method improves the SPM threshold by more than 9 dB.

APA, Harvard, Vancouver, ISO, and other styles

10

Radha, Ramaswamy, and Vaduganathan Ramesh Kumar. "Interplay Between Dispersion and Nonlinearity in Femtosecond Soliton Management." Zeitschrift für Naturforschung A 65, no. 6-7 (July 1, 2010): 549–54. http://dx.doi.org/10.1515/zna-2010-6-710.

Full text

Abstract:

In this paper, we investigate the inhomogeneous higher-order nonlinear Schr¨odinger (NLS) equation governing the femtosecond optical pulse propagation in inhomogeneous fibers using gauge transformation and generate bright soliton solutions from the associated linear eigenvalue problem. We observe that the amplitude of the bright solitons depends on the group velocity dispersion (GVD) and the self-phase modulation (SPM) while its velocity is dictated by the third-order dispersion (TOD) and GVD. We have shown how the interplay between GVD, SPM, and TOD can be profitably exploited to change soliton width, amplitude (intensity), shape, phase, velocity, and energy for an effective femtosecond soliton management. The highlight of our paper is the identification of ‘optical similaritons’ arising by virtue of higher-order effects in the femtosecond regime.

APA, Harvard, Vancouver, ISO, and other styles

11

Tawfik, Walid. "Precise measurement of ultrafast laser pulses using spectral phase interferometry for direct electric-field reconstruction." Journal of Nonlinear Optical Physics & Materials 24, no. 04 (December 2015): 1550040. http://dx.doi.org/10.1142/s021886351550040x.

Full text

Abstract:

In this work, I present a novel method for measuring the pulse duration of few-cycle pulses using spectral phase interferometry for direct electric-field reconstruction (SPIDER) with high accuracy. These few-cycle pulses were generated due to nonlinear self-phase modulation (SPM) in nonlinear medium (neon gas) using a one meter hollow-fiber. The observed reconstructed pulse intensity autocorrelation function was varied from 5.35[Formula: see text]fs to almost 13[Formula: see text]fs. Moreover, the applied method allows for direct controlling of the output pulse duration through variation of the pulse-width of input pulses at different pressure of neon gas. The observed results indicate that the SPM was enhanced for high neon pressure (2.5[Formula: see text]atm.) and short input pluses (32[Formula: see text]fs) without chirping. The obtained results may give an opportunity to monitor and control ultrafast transit interaction in femtosecond chemistry.

APA, Harvard, Vancouver, ISO, and other styles

12

CHENG, CHUNFU, YOUQING WANG, YIWEN OU, and QINGHUA LV. "TRANSFORM-LIMITED SPECTRAL COMPRESSION BY USING NEGATIVELY CHIRPED PARABOLIC PULSE IN ALL-NORMAL DISPERSION PHOTONIC CRYSTAL FIBERS." Journal of Nonlinear Optical Physics & Materials 21, no. 03 (September 2012): 1250040. http://dx.doi.org/10.1142/s0218863512500403.

Full text

Abstract:

A theoretical investigation on the parabolic pulse nonlinear propagation and spectral compression in all-normal dispersion photonic crystal fibers (PCFs) is presented. It is found that use of larger chirp can obtain higher quality transform-limited spectrally compressed parabolic pulses due to almost purely the effects of self-phase modulation (SPM) — because of its all-normal dispersion with smaller group velocity dispersion (GVD). Also, use of long initial negatively chirped parabolic pulses can lead to the most efficient transform-limited spectral compression under the optimal compression condition.

APA, Harvard, Vancouver, ISO, and other styles

13

Estevez-Mendoza, Yhon Edinson, Byron Medina-Delgado, and Luis Leonardo Camargo-Ariza. "Automodulación de fase en redes ópticas pasivas de próxima generación, utilizando modulación por desplazamiento cuaternario de fase." Respuestas 22, no. 1 (January 1, 2017): 37. http://dx.doi.org/10.22463/0122820x.818.

Full text

Abstract:

Antecedentes: la información en un canal de fibra óptica sufre distorsiones debido a la aparición de efectos lineales y no lineales, restringiendo la velocidad de transmisión. En este documento se analiza el error no lineal denominado automodulación de fase (SPM),el cual genera un desfase en los pulsos trasmitidos, ocasionando errores de bits en la comunicación. Objetivo: el proyecto está orientado a evaluar el comportamiento del error no lineal SPM en una comunicación monocanal de fibra óptica utilizando Matlab. Métodos: su desarrollo parte del modelado matemático del error SPM, para ser codificado en Matlab y evaluar su desempeño en el canal para condiciones específicas. Para realizar las simulaciones se implementó un canal de comunicaciones en fibra óptica, teniendo en cuenta los parámetros que rigen las redes XGPON o 10GPON que son la siguiente generación de Red Óptica Pasiva con Capacidad de Gigabit (GPON). Para simular el canal de fibra óptica se definieron las distancias de 20, 40 y 60 km, y las potencias de 4, 10 y 20 mW, con velocidades de transmisión de 10 Gbps, en las longitudes de onda de 1550 y 1310 nm, usando la modulación QPSK. Los parámetros para desarrollar la simulación consideraron las recomendaciones de la Unión Internacional de Telecomunicaciones (ITU). Resultados: mediante un análisis gráfico se identificaron los parámetros que afectan el error SPM, como la potencia, el área efectiva, la distancia y el tipo de fibra, entre otros. Conclusión: el error SPM por sí solo no es perjudicial para las redes XGPON en la modulación QPSK, considerando que el máximo desfase obtenido en el proyecto fue de 28.8°, siempre y cuando se tengan en cuenta la potencia, la distancia y los tipos de fibra, de acuerdo con las recomendaciones de la ITU (G652, G987, G691 y G957). Palabras clave: Automodulación de fase, fibra óptica monomodo estándar, modulación por desplazamiento cuaternario de fase, red óptica pasiva con capacidad de gigabit.AbstractBackground: the information transmitted by optical fiber channels is distorted due to the appearance of linear and nonlinear effects, which restrict the transmission rate, this paper analyzes the nonlinear error selfphase modulation (SPM) Objective: the project aims to evaluate the behavior of nonlinear error SPM in a single channel fiber optic communication using Matlab. Methods: development of the mathematical modeling of error SPM to be coded in Matlab and evaluate their performance in the channel for specific conditions. To perform simulations a communications channel is implemented in fiber optics taking into account the parameters governing XGPON or 10GPON networks or which are the next generation of Gigabit Passive Optical Network (GPON). To perform simulations three distances 20, 40 and 60 km, and three power values of 4, 10 and 20 mW were defined, with transmission speeds of 10 Gbps wavelengths 1550 and 1310 nm, respectively; using QPSK modulation. The parameters to simulate were defined taking into account the recommendations of the International Telecommunication Union (ITU). Results: using a graphical analysis we identified the parameters that affect the error SPM, such as potency, the effective area, the distance, the fiber type, among others. Conclusion: the error SPM alone is not harmful to the GPON networks in QPSK modulation, considering that the maximum phase shift obtained in the project was 28.8°, provided that the power, the distance and the types of fiber are taken into account according to the recommendations of the ITU (G652, G987, G691 y G957).Keywords: Gigabit passive optical network, quaternary phase shift keying, self phase modulation, standar singlemode fiber.

APA, Harvard, Vancouver, ISO, and other styles

14

Atiah Al-Zahy, Younis Mohamed. "A Study of the generation of laser soliton from spontaneous emission by ring cavity with carbon nanotube." Iraqi Journal of Physics (IJP) 12, no. 25 (February 12, 2019): 25–37. http://dx.doi.org/10.30723/ijp.v12i25.301.

Full text

Abstract:

We demonstrate a behavior of laser pulse grows through fiber laser inside and output cavity with a soliton fiber laser based on the multi-wall carbon nanotube saturable absorber (SA), we investigate the effects of a saturable absorber parameter on the mode-locking of a realistic Erbium fiber ring laser. Generalized nonlinear Schrodinger equation including the nonlinear effects as gain dispersion, second anomalous group velocity dispersion (GVD), self phase modulation (SPM), and two photon absorption used to describe pulse evolution. An analytical method has been used to understand and to quantify the role of the SA parameter on the propagation dynamics of pulse laser. We compute the chirp, power, width and phase of the soliton for range of SA parameters and we studied stability against nonlinear effects at different SA parameter ranges.

APA, Harvard, Vancouver, ISO, and other styles

15

SONG, H., U. C. PAEK, and D. Y. KIM. "WALK-OFF LENGTH LIMITED SPECTRAL BROADENING IN SUPERCONTINUUM GENERATION." Journal of Nonlinear Optical Physics & Materials 18, no. 01 (March 2009): 99–110. http://dx.doi.org/10.1142/s0218863509004464.

Full text

Abstract:

Detailed spectrum broadening mechanisms in supercontinuum (SC) generation are studied with an all-fiber pulsed laser source and a highly nonlinear dispersion-shifted fiber (HN-DSF). Mode-locked fiber laser pulses are stretched to four different pulse widths, and SC spectra are measured with different propagation distances with these pulses. By observing the development of spectral width with distance, we have observed that self-phase modulation (SPM) rather than soliton fission is the dominant process at the beginning of SC generation in our case. We have also confirmed that four-wave mixing (FWM) and its walk-off problem associated with different spectral components are the major limiting factors in efficient wide-band SC generation.

APA, Harvard, Vancouver, ISO, and other styles

16

KBASHI, HANI JASSIM, HUSSEIN JAWAD, KAIS A. AL-NAIMEE, ROBERTO BENOCCI, PAOLO CARPEGGIANI, CLAUDIO PEREGO, and DIMITRI BATANI. "SPECTRAL WIDTH VARIATION OF ULTRASHORT LASER PULSES IN MONOMODE OPTICAL FIBERS." Journal of Nonlinear Optical Physics & Materials 18, no. 03 (September 2009): 541–52. http://dx.doi.org/10.1142/s0218863509004774.

Full text

Abstract:

Femtosecond laser pulse propagation in monomode optical fibers is demonstrated and investigated numerically (by simulations) and experimentally in this paper. A passively mode locked Nd:glass laser giving a pulse duration of about 200 fsec at 1053 nm wavelength and 120 mW average optical power with 100 MHz repetition rate is used in the experimental work. Numerical simulations are done by solving the nonlinear Schrödinger equation with the aid of Matlab program. The results show that self phase modulation (SPM) leads to compression of the spectral width from 5 nm to 2.1 nm after propagation of different optical powers (34, 43, 86 and 120 mW) in fibers of different length (5, 15, 35 m). The varying optical powers produced a varying phase shift. The output spectral width also changed with the fiber length at a given peak power.

APA, Harvard, Vancouver, ISO, and other styles

17

Zhao, Zixin, Zhaoxian Xiao, Yiying Zhuang, Hangying Zhang, and Hong Zhao. "An interferometric method for local phase modulation calibration of LC-SLM using self-generated phase grating." Review of Scientific Instruments 89, no. 8 (August 2018): 083116. http://dx.doi.org/10.1063/1.5031938.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Peralta Sevilla, Arturo, Milton Tipán Simbaña, and Ferney Amaya Fernández. "Análisis de los efectos dispersivos y no lineales de un canal óptico empleando métodos numéricos." Ingenius, no. 11 (June 30, 2014): 5. http://dx.doi.org/10.17163/ings.n11.2014.01.

Full text

Abstract:

En este documento, presentamos el modelado de un canal de fibra óptica mediante la resolución de la Ecuación No Lineal de Schrödinger (NLSE). Se presentan las dos formas de solución para la NLSE: la forma analítica y la forma numérica empleando el método SSF (Split–Step Fourier Transform). En la simulación se consideran efectos lineales como la dispersión cromática y los efectos no lineales. Uno de los efectos no lineal es el efecto Kerr, del que se derivan los efectos de auto modulación fase (Self Phase Modulation, SPM) y modulación de fase cruzada (Cross Phase Modulation, XPM). Los métodos de solución son empleados para simular y visualizar los efectos de propagación a través de la fibra óptica. Se analizan los efectos de propagación para un escenario de red de acceso óptica con fibra mono–modo estándar (Single Mode Fiber, SMF), con longitudes de fibra de 20 y 40 km y tasas de bits entre 1,25 y 100 Gbps. De otro lado, son presentados los fenómenos no lineales como dispersión estimulada de Raman (Stimulated Raman Scattering, SRS) y dispersión estimulada de Brillouin (Stimulated Brillouin Scattering, SBS). Se presentan las ecuaciones para modelar SRS. Se presentan resultados de simulación de la amplificación Raman en un escenario seleccionado.

APA, Harvard, Vancouver, ISO, and other styles

19

Chu, Jung-Eun, Saji N. Hameed, and Kyung-Ja Ha. "Nonlinear, Intraseasonal Phases of the East Asian Summer Monsoon: Extraction and Analysis Using Self-Organizing Maps." Journal of Climate 25, no. 20 (May 4, 2012): 6975–88. http://dx.doi.org/10.1175/jcli-d-11-00512.1.

Full text

Abstract:

Abstract The hypothesis that regional characteristics of the East Asian summer monsoon (EASM) result from the presence of nonlinear coupled features that modulate the seasonal circulation and rainfall at the intraseasonal time scale is advanced in this study. To examine this hypothesis, the authors undertake the analysis of daily EASM variability using a nonlinear multivariate data classifying algorithm known as self-organizing mapping (SOM). On the basis of various SOM node analyses, four major intraseasonal phases of the EASM are identified. The first node describes a circulation state corresponding to weak tropical and subtropical pressure systems, strong upper-level jets, weakened monsoonal winds, and cyclonic upper-level vorticity. This mode, related to large rainfall anomalies in southeast China and southern Japan, is identified as the mei-yu–baiu phase. The second node represents a distinct circulation state corresponding to a strengthened subtropical high, monsoonal winds, and anticyclonic upper-level vorticity in southeast Korea, which is identified as the changma phase. The third node is related to copious rain over Korea following changma, which we name the postchangma phase. The fourth node is situated diagonally opposite the changma mode. Because Korea experiences a dry spell associated with this SOM node, it is referred to as the dry-spell phase. The authors also demonstrate that a strong modulation of the changma and dry-spell phases on interannual time scales occurs during El Niño and La Niña years. Results imply that the key to predictability of the EASM on interannual time scales may lie with analysis and exploitation of its nonlinear characteristics.

APA, Harvard, Vancouver, ISO, and other styles

20

Hario, Fakhriy, Eka Maulana, Hadi Suyono, Rini N. Hasanah, and Sholeh H. Pramono. "Impact of Combine Dithering and Modulators to Mitigate Noise in Radio Over Fiber System." Indonesian Journal of Electrical Engineering and Computer Science 12, no. 1 (October 1, 2018): 428. http://dx.doi.org/10.11591/ijeecs.v12.i1.pp428-432.

Full text

Abstract:

<p>A well-prepared Radio over Fiber (RoF) is a technology that combines two transmission technologies, radio and optical fiber transmissions. The study focused on the characteristics and problems of the optical fiber medium. One of the problems in the optical fiber is the effect of nonlinear characteristic, which caused by the high light intensity in the optical fiber core with extended interaction area in a single mode fiber (SMF). This characteristic reduces the output width and creates a pulse broadening. The nonlinear characteristics discussed in this study focused on SPM (self-phase modulation) and GVD (Group Velocity Dispersion). To overcome the nonlinear problems, this study presented a method to make the noise-resistant transmitted signal and improve the optical fiber power range. The fundamental of this study was developing similarities of previous studies regarding nonlinearity in the optical fiber. The results show that the use of two modulators combined with the amplification generated the signal with smoother spectrum, which means that the spectrum distribution was more uniform. There was 61.5 % increase of the peak power of the output signal after amplification using an optical amplifier.</p>

APA, Harvard, Vancouver, ISO, and other styles

21

Desem, C. "Composite second order distortion due to self-phase modulation in externally modulated optical AM-SCM systems operating at 1550 nm." Electronics Letters 30, no. 24 (November 24, 1994): 2055–56. http://dx.doi.org/10.1049/el:19941390.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Wang, Zesong, Canxin Tian, Alexander Tolstogouzov, Feng Liang, Changwei Zou, Songquan Li, Sergey I. Gusev, et al. "Microstructure and Rutherford Backscattering Spectrometry of Hard/Lubricant Mo-Ti-Al-N Multilayered Coatings Prepared by Multi-Arc Ion Plating at Low Substrate Rotation." Coatings 10, no. 2 (January 23, 2020): 101. http://dx.doi.org/10.3390/coatings10020101.

Full text

Abstract:

To develop the hard and self-lubricating coatings applied for the industrial dry-cutting and die-casting machining tool fields, a series of MoTiAlN/MoN/Mo multilayered coatings were deposited on Si substrates under low substrate rotation by cathodic multi-arc ion plating. XRD, SEM, TEM, RBS, nanoindentation, and tribology tester were used to monitor the phase structure, morphology, component, nanohardness, and friction coefficient of the coatings. It was found that the coatings deposited at various substrate rotations comprised paramount cubic B1 structure TiAlN and Mo2N phases. The micrographs confirmed that the mean modulation period and total physical thickness of multilayered TiAlN/Mo2N coatings with a sharp interface fabricated at 2 revolutions per minute (rpm) were 26 nm and 1.15 μm. The mean nanohardness and friction coefficient were ca. 30 GPa and 0.4, respectively. RBS results along with the SIMNRA code allowed to estimate the total atomic concentrations and the physical thickness of individual sublayer as well as the modulation period of multilayered coatings, which demonstrated an efficiency of this approach for characterization of nano-multilayered structures.

APA, Harvard, Vancouver, ISO, and other styles

23

MENEZES, J. W. M., J. R. R. SOUSA, M. B. C. COSTA, A. C. FERREIRA, F. T. LIMA, C. S. SOBRINHO, M. L. LYRA, and A. S. B. SOMBRA. "NUMERICAL ANALYSIS OF THE INSTANTANEOUS AND RELAXED KERR MODEL FOR GENERATION OF THE ALL-OPTICAL LOGIC GATES WITH TRIANGULAR FIBER COUPLER (TFC)." Journal of Nonlinear Optical Physics & Materials 21, no. 03 (September 2012): 1250037. http://dx.doi.org/10.1142/s0218863512500373.

Full text

Abstract:

All-optical logic gates can enable many advanced functions such as all-optical bit-pattern recognition, all-optical bit-error rate monitoring, all-optical packet address and payload separation, all-optical label swapping and all-optical packet drop in optical time domain multiplexing (OTDM) networks. Recently, much attention has been given to the influence of the relaxation process (sometimes called the Debye relaxation model) of the nonlinear response because the usual assumption of instantaneous nonlinear response fails for ultrashort pulses and additional contributions coming from nonlinear dispersion and relaxed nonlinearity have to be taken into account. The Kerr–Debye model is a relaxation of the nonlinear Kerr model in which the relaxation coefficient is a finite response time of the nonlinear material. In this paper, we have presented a numerical analysis of the triangular fiber coupler (TFC) for generation of the all-optical logic gates with nonlinear optical (NLO) properties, where we consider the nonlinear effects Kerr group velocity dispersion (GVD) and self-phase modulation (SPM) instantaneous and relaxed (Kerr–Debye model). To implement all-optical logic gates we used TFC of three symmetric configurations [Instantaneous (III), Relaxed (RRR-5 and RRR-9)]. In the instantaneous condition, the TFC is made up of silica optical fibers (with instantaneous response time — indicated by III) and in the relaxed conditions (RRR-5 and RRR-9) the TFC is made up of fibers with delayed response time of around 25 ps (for example, the polymer optical fibers). In our paper, we are interested in the transmission characteristics, the XRatio level (XR (dB)) as a function of the ΔΦ parameter, the normalized time duration (NTD) and the pulse evolution along the TFC and finally to compare the performance of all-optical logic gates, we will use the figure-of-merit of the logic gates (FOMELG (dB)) defined as a function of the extinction ratio of the gate outputs. All results were obtained numerically, considering a very simple model for generation of a optical logic gates.

APA, Harvard, Vancouver, ISO, and other styles

24

Lesche, B., and W. Margulis. "Note on self-phase modulation and cross-phase modulation." Optics Communications 113, no. 4-6 (January 1995): 481–86. http://dx.doi.org/10.1016/0030-4018(94)00532-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Mallamaci, Michael P. "Scanned-Probe Microscopy of Elastomer Blends: Morphology and Mechanical Properties." Microscopy and Microanalysis 4, S2 (July 1998): 824–25. http://dx.doi.org/10.1017/s1431927600024247.

Full text

Abstract:

Scanned-probe microscopy (SPM) has found application to a variety of polymer systems, primarily for the examination of surface morphology and the assessment of surface properties. In fact, SPM is unique in its ability to probe both phase morphology and mechanical properties simultaneously. The examination of industrial elastomers and their blends by SPM techniques can provide morphological information historically obtained only by transmission-electron microscopy (TEM). Since contrast with the SPM can be generated by differences in mechanical response of the constituent phases, polymer blends which are difficult to etch or stain for TEM can be successfully examined. In many cases measurements of polymer morphology can be made more easily with SPM, since time-consuming steps associated with thin-section production and staining are not required. Contact and tapping-mode operation along with force modulation and phase measurement can be used to examine phase microstructure, phase morphology, filler type, filler distribution, and viscoelastic response in elastomer systems.

APA, Harvard, Vancouver, ISO, and other styles

26

Pitois, Stéphane. "Influence of cross-phase modulation in SPM-based nonlinear optical loop mirror." Optics Communications 253, no. 4-6 (September 2005): 332–37. http://dx.doi.org/10.1016/j.optcom.2005.05.003.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Masoud, M. I., and A. S. Abdelkhalik. "Performance Evaluation of Eleven-Phase Induction Machine with Different PWM Techniques." Journal of Engineering Research [TJER] 12, no. 1 (June 1, 2015): 1. http://dx.doi.org/10.24200/tjer.vol12iss1pp1-14.

Full text

Abstract:

Multiphase induction machines are used extensively in low and medium voltage (MV) drives. In MV drives, power switches have a limitation associated with switching frequency. This paper is a comparative study of the eleven-phase induction machine’s performance when used as a prototype and fed sinusoidal pulse-width-modulation (SPWM) with a low switching frequency, selective harmonic elimination (SHE), and single pulse modulation (SPM) techniques. The comparison depends on voltage/frequency controls for the same phase of voltage applied on the machine terminals for all previous techniques. The comparative study covers torque ripple, stator and harmonic currents, and motor efficiency.

APA, Harvard, Vancouver, ISO, and other styles

28

Yang, Qiguang, Jinhai Si, Yougui Wang, and Peixian Ye. "Phase-modulation effects in self-diffraction." Physical Review A 54, no. 2 (August 1, 1996): 1702–8. http://dx.doi.org/10.1103/physreva.54.1702.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Wright, Ewan M. "Quantum theory of self-phase modulation." Journal of the Optical Society of America B 7, no. 6 (June 1, 1990): 1142. http://dx.doi.org/10.1364/josab.7.001142.

Full text

APA, Harvard, Vancouver, ISO, and other styles

30

Manassah, Jamal T. "Self-phase modulation of incoherent light." Optics Letters 15, no. 6 (March 15, 1990): 329. http://dx.doi.org/10.1364/ol.15.000329.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Dinev, S. G., A. A. Dreischuh, and S. Balushev. "Symbiotic light pairs sustained by self-phase modulation and cross-phase modulation." Physica Scripta 47, no. 6 (June 1, 1993): 792–96. http://dx.doi.org/10.1088/0031-8949/47/6/017.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Pathmanathan, Mehanathan, Wen L. Soong, and Nesimi Ertugrul. "Maximum-Torque-per-Ampere Control of Phase Advance Modulation of an SPM Wind Generator." IEEE Transactions on Industry Applications 48, no. 5 (September 2012): 1443–51. http://dx.doi.org/10.1109/tia.2012.2209169.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Hofer, M., M. E. Fermann, F. Haberl, M. H. Ober, and A. J. Schmidt. "Mode locking with cross-phase and self-phase modulation." Optics Letters 16, no. 7 (April 1, 1991): 502. http://dx.doi.org/10.1364/ol.16.000502.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Xu, C., L. Mollenauer, and Xiang Liu. "Compensation of nonlinear self-phase modulation with phase modulators." Electronics Letters 38, no. 24 (2002): 1578. http://dx.doi.org/10.1049/el:20021050.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

SHEN YU-ZHEN, WANG QING-YUE, XING QI-RONG, and SHI JI-YING. "SELF-PHASE MODULATION IN CHIRPED-PULSE AMPLIFICATION." Acta Physica Sinica 45, no. 2 (1996): 214. http://dx.doi.org/10.7498/aps.45.214.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Silva, L. O., and J. T. Mendonça. "Photon kinetic theory of self-phase modulation." Optics Communications 196, no. 1-6 (September 2001): 285–91. http://dx.doi.org/10.1016/s0030-4018(01)01368-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Pliszka, Pawel, and Partha P. Banerjee. "Self-phase Modulation in Quadratically Nonlinear Media." Journal of Modern Optics 40, no. 10 (October 1993): 1909–16. http://dx.doi.org/10.1080/09500349314551931.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Blow, K. J., Rodney Loudon, and Simon J. D. Phoenix. "Graphical Representation of Self-phase Modulation Noise." Journal of Modern Optics 40, no. 12 (December 1993): 2515–24. http://dx.doi.org/10.1080/09500349314552501.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Blow, K. J., R. Loudon, and S. J. D. Phoenix. "Exact solution for quantum self-phase modulation." Journal of the Optical Society of America B 8, no. 8 (August 1, 1991): 1750. http://dx.doi.org/10.1364/josab.8.001750.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Manassah, Jamal T. "Self-phase modulation of incoherent light revisited." Optics Letters 16, no. 21 (November 1, 1991): 1638. http://dx.doi.org/10.1364/ol.16.001638.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Dumais, P., A. Villeneuve, P. G. J. Wigley, F. Gonthier, S. Lacroix, G. I. Stegeman, and J. Bures. "Enhanced self-phase modulation in tapered fibers." Optics Letters 18, no. 23 (December 1, 1993): 1996. http://dx.doi.org/10.1364/ol.18.001996.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Perry, M. D., T. Ditmire, and B. C. Stuart. "Self-phase modulation in chirped-pulse amplification." Optics Letters 19, no. 24 (December 15, 1994): 2149. http://dx.doi.org/10.1364/ol.19.002149.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Fischer, Martin C., Henry C. Liu, Ivan R. Piletic, Yasmin Escobedo-Lozoya, Ryohei Yasuda, and Warren S. Warren. "Self-phase modulation signatures of neuronal activity." Optics Letters 33, no. 3 (January 22, 2008): 219. http://dx.doi.org/10.1364/ol.33.000219.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Xin, Chenguang, Jianbin Zhang, Peizhen Xu, Yu Xie, Ni Yao, Ning Zhou, Xin Guo, Wei Fang, and Limin Tong. "Self-phase modulation in single CdTe nanowires." Optics Express 27, no. 22 (October 17, 2019): 31800. http://dx.doi.org/10.1364/oe.27.031800.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Yang, Ying, Xing Fei Li, and Hong Biao Xiang. "A Novel Phase Modulation Accelerometer." Applied Mechanics and Materials 734 (February 2015): 113–17. http://dx.doi.org/10.4028/www.scientific.net/amm.734.113.

Full text

Abstract:

A novel phase modulation accelerometer based on self-mixing effect is presented. A quartz pendulous reed suspended by dual flexible beam is used as the first step sensing unit, which translates the acceleration signal to the displacement of quartz pendulous reed. The laser self-mixing interferometer reads out the displacement of quartz pendulous reed while the sensor experience acceleration. All-phase spectrum analysis is applied to detect the phase of self-mixing interference signals to reconstruct the acceleration. Finally, performances of the novel phase modulation accelerometer are measured by experiments. Experimental results indicate that the resolution of the acceleration sensor based on laser self-mixing interference can achieve sub micro-g. The phase modulation accelerometer has the potential to achieve high-precision, compact accelerometers.

APA, Harvard, Vancouver, ISO, and other styles

46

Kumar, S., and Dong Yang. "Second-order theory for self-phase modulation and cross-phase modulation in optical fibers." Journal of Lightwave Technology 23, no. 6 (June 2005): 2073–80. http://dx.doi.org/10.1109/jlt.2005.849940.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

He, Jing-Song, Shu-Wei Xu, M. S. Ruderman, and R. Erdélyi. "State Transition Induced by Self-Steepening and Self Phase-Modulation." Chinese Physics Letters 31, no. 1 (January 2014): 010502. http://dx.doi.org/10.1088/0256-307x/31/1/010502.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Mazhar, Shah Faisal B., and Robert R. Alfano. "Modulation instability induced by cross-phase modulation of transient stimulated Raman scattering and self-phase modulation in calcite." Optics Letters 45, no. 11 (June 1, 2020): 3167. http://dx.doi.org/10.1364/ol.395101.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

da Cruz, Heber R., J. Miguel Hickmann, and A. S. Gouveia-Neto. "Self-phase-modulation and induced phase modulation of noisy radiation in single-mode optical fibers." Physical Review A 45, no. 11 (June 1, 1992): 8268–76. http://dx.doi.org/10.1103/physreva.45.8268.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Präkelt, A., M. Wollenhaupt, C. Sarpe-Tudoran, A. Assion, and T. Baumert. "Filling a spectral hole via self-phase modulation." Applied Physics Letters 87, no. 12 (September 19, 2005): 121113. http://dx.doi.org/10.1063/1.2056589.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!