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Journal articles on the topic 'Coherent optical-OFDM (CO-OFDM)'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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1

Raj, Ajay Amrit. "Adaptive Neuro-Fuzzy Inference System-based Nonlinear Equalizer for CO-OFDM Systems." Computer Journal 63, no. 2 (2019): 169–78. http://dx.doi.org/10.1093/comjnl/bxz072.

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Abstract The principle of orthogonal frequency-division multiplexing (OFDM) is to transmit the data through a large number of multiple orthogonal subcarriers. The coherent optical OFDM (CO-OFDM) is OFDM data that are being modulated to light frequency and being detected in coherent manner. CO-OFDM brings to optical communications the combination of two powerful techniques, coherent optical detection and OFDM. One of the primary challenges in the CO-OFDM system is to remove optical fiber nonlinear effects. This makes nonlinearity compensation a critical task of the CO-OFDM system. So a nonlinea
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2

Nehra, Monika, and Deepak Kedia. "Design of Optical I/Q Modulator Using Dual-drive Mach-Zehnder Modulators in Coherent Optical-OFDM System." Journal of Optical Communications 39, no. 2 (2018): 155–59. http://dx.doi.org/10.1515/joc-2016-0089.

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AbstractA CO-OFDM system combines the advantages of both coherent detection and OFDM modulation for future high speed fiber transmission. In this paper, we propose an I/Q modulation technique using dual-drive MZMs for high rate 10 Gb/s CO-OFDM system. The proposed modulator provides 10.63 dBm improved optical spectra compared to a single dual-drive MZM. The simulation results in terms of BER and Q factor are quite satisfactory upto a transmission reach of 3,000 km and that to without making use of any dispersion compensation. A BER of about 8.03×10−10and 15.06 dB Q factor have been achieved at
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3

Kadum, Jaffar Emad, and Raad Sami Fyath. "Integration of IR-UWB Services into Single- and Multi-Channel Optical Coherent OFDM Network." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 14, no. 2 (2014): 5398–408. http://dx.doi.org/10.24297/ijct.v14i2.2056.

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Distribution of wireless communication signals over implemented optical networks is a challenged task since the presence of wireless services may affect the performance of the existing wired ones. This paper addresses the possibility of integrating impulse radio-ultrawideband (IR-UWB) wireless services into implemented coherent optical orthogonal frequency division multiplexing (CO-OFDM) network. Simulation results are presented for the transmission of a 625Mb/s UWB  signal with either 50Gb/s single-channel or three-channel OFDM system. Both Gaussian monocycle and 5th-order derivative Gaussi
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4

Hussein Ali, Adnan, Hayder Jasim Alhamdane, and Begared Salih Hassen. "Design analysis and performance evaluation of the WDM integration with CO-OFDM system for radio over fiber System." Indonesian Journal of Electrical Engineering and Computer Science 15, no. 2 (2019): 870. http://dx.doi.org/10.11591/ijeecs.v15.i2.pp870-878.

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<span>The optical communication and wireless networks can be integrated to increase the capacity and mobility with decrease the costs in the access networks. Optical communication is considered a Fiber optic communication that can be used for wired and wireless communication. The problems of Fiber optic communication have a solution represented by Radio over fiber (RoF) which can control many base stations (BSs) that connect to a central station (CS) with an optical fiber. The Coherent optical OFDM (CO-OFDM) have concerned a great interest due to the high spectral efficiency and strength
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5

Shao, Yu Feng, Jiang Jun Wang, Shi Kui Wang, Lian Dong Wang, Yin Xiang Luo, and Ze Fu Tan. "Coherent Optical OFDM-PON Using Phase Diversity Receiver and Phase Estimation." Applied Mechanics and Materials 475-476 (December 2013): 1697–700. http://dx.doi.org/10.4028/www.scientific.net/amm.475-476.1697.

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In this paper, a novel CO-OFDM system using phase diversity receiver and phase estimating is proposed, theoretically analyzed, and demonstrated by simulation results. 10Gb/s C0-OFDM signals can travel in this system for at least 320km.
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6

Giacoumidis, Elias, Yi Lin, Jinlong Wei, Ivan Aldaya, Athanasios Tsokanos, and Liam Barry. "Harnessing machine learning for fiber-induced nonlinearity mitigation in long-haul coherent optical OFDM." Future Internet 11, no. 1 (2018): 2. http://dx.doi.org/10.3390/fi11010002.

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Coherent optical orthogonal frequency division multiplexing (CO-OFDM) has attracted a lot of interest in optical fiber communications due to its simplified digital signal processing (DSP) units, high spectral-efficiency, flexibility, and tolerance to linear impairments. However, CO-OFDM’s high peak-to-average power ratio imposes high vulnerability to fiber-induced non-linearities. DSP-based machine learning has been considered as a promising approach for fiber non-linearity compensation without sacrificing computational complexity. In this paper, we review the existing machine learning approac
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7

Bharti, Manisha. "Performance Enhancement of Coherent Optical OFDM System Using LMS Algorithm." Journal of Telecommunications and Information Technology 1 (March 31, 2020): 1–5. http://dx.doi.org/10.26636/jtit.2020.137919.

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Instability of the local oscillator causes phase noise – a phenomenon that is a disadvantage and is considered to be a major obstacle in the functioning of coherent optical orthogonal frequency division multiplexing (CO-OFDM) systems. An attempt has been made in this paper to reduce the effects of common phase errors generated by phase noise. In this paper, a least mean square (LMS) based algorithm is proposed for estimation of phase noise. Using this proposed algorithm, the major problem of phase ambiguity caused by cycle slip is avoided and the bit error rate is greatly improved. Further, the
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8

Wang, Jingjing, Yongtao Du, Chunhao Liang, Zhong Li, and Jing Fang. "Performance Evaluation of Highly Nonlinear Fiber (HNLF) Based Optical Phase Conjugation (OPC) in Long Haul Transmission of 640 Gbps 16-QAM CO-OFDM." Photonics 8, no. 2 (2021): 45. http://dx.doi.org/10.3390/photonics8020045.

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This paper presents the quantitative measurement through an experimental test of 640 Gbps 16-QAM coherent-optical orthogonal frequency-division multiplexing (CO-OFDM) over 800 km optical fiber with mid-link optical phase conjugation (OPC) using highly nonlinear fiber (HNLF). The first focus is the OPC parameter optimization, including the optimization of HNLF length and signal/pump power that inputs into OPC. Four different HNLFs, as the illustrative examples, are investigated. The second focus is to investigate the effects of fiber dispersion, nonlinearity, and amplified spontaneous emission
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9

Kaushik, Vikas, and Himanshi Saini. "Comparative Examination of CO-OFDM Formats for Varied Fiber-Length and Bit Rate." Journal of University of Shanghai for Science and Technology 23, no. 07 (2021): 1058–67. http://dx.doi.org/10.51201/jusst/21/07174.

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The use of multiple carriers in Orthogonal Frequency Division Modulation (OFDM) makes it bandwidth-efficient and suitable for modern communication such as Long-Term Evolution (LTE), Digital Subscriber Line (DSL) internet access, optical fiber communication, digital television, audio broadcasting, etc. In this paper, four modulation formats by using Coherent Optical Orthogonal Frequency Division Modulations (CO-OFDM) have been analyzed. These are Single Port Dual Polarization (SP DP) 16 QAM, Single-Port Single Polarization (SP SP) 16 QAM, Dual Port Single Polarization (DP SP) QPSK 16-QAM, and S
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10

Ahmed, Bashar M., and Raad S. Fyath. "Effect of Fiber Nonlinearity on the Performance of WDM Dual-Polarization Coherent Optical OFDM Systems." INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY 13, no. 9 (2014): 4943–64. http://dx.doi.org/10.24297/ijct.v13i9.2397.

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In recent years, there is increasing interest in using dual-polarization (DP) technique to enable future systems with at least 100 Gb/s rate per channel to operate over existing optical networks. The performance of these advanced systems can be enhanced further by using coherent optical orthogonal multiplexing (CO-OFDM) technique which offers high spectral efficiency and outstanding tolerance of fiber dispersion. This paper addresses the effect of fiber nonlinear optics on the performance of dual-polarization wavelength-division multiplexing (WDM) CO-OFDM systems operating with 100 Gb/s per ch
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11

Miglani, Rajan, and Jagjit Singh Malhotra. "Investigation on R–S Coded Coherent OFDM Free Space Optical (CO-OFDM-FSO) Communication Link Over Gamma–Gamma Channel." Wireless Personal Communications 109, no. 1 (2019): 415–35. http://dx.doi.org/10.1007/s11277-019-06571-z.

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12

Wu Jinda, 吴金达, 卢瑾 Lu Jin, 任宏亮 Ren Hongliang, 覃亚丽 Qin Yali, 郭淑琴 Guo Shuqin, and 胡卫生 Hu Weisheng. "Nonlinear Equalizer Based on General Regression Neural Network in Coherent Optical OFDM System." Acta Optica Sinica 38, no. 9 (2018): 0906002. http://dx.doi.org/10.3788/aos201838.0906002.

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13

Zabala-Blanco, David, Marco Mora, Cesar A. Azurdia-Meza, Ali Dehghan Firoozabadi, Pablo Palacios Játiva, and Ismael Soto. "Relaxation of the Radio-Frequency Linewidth for Coherent-Optical Orthogonal Frequency-Division Multiplexing Schemes by Employing the Improved Extreme Learning Machine." Symmetry 12, no. 4 (2020): 632. http://dx.doi.org/10.3390/sym12040632.

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A coherent optical (CO) orthogonal frequency division multiplexing (OFDM) scheme gives a scalable and flexible solution for increasing the transmission rate, being extremely robust to chromatic dispersion as well as polarization mode dispersion. Nevertheless, as any coherent-detection OFDM system, the overall system performance is limited by laser phase noises. On the other hand, extreme learning machines (ELMs) have gained a lot of attention from the machine learning community owing to good generalization performance, negligible learning speed, and minimum human intervention. In this manuscri
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14

Tithi, F. H., and S. P. Majumder. "Performance analysis of a DCO-CO-OFDM optical transmission system with distributed Raman amplifier using coherent heterodyne receiver." Optik 210 (May 2020): 164481. http://dx.doi.org/10.1016/j.ijleo.2020.164481.

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15

Kumar, Suresh, Akshaya Dhingra, and Payal Arora. "Evaluation of Proposed Coherent Optical OFDM Link Using X-QAM with Polarization Division Multiplexing." Journal of Optical Communications, May 15, 2019. http://dx.doi.org/10.1515/joc-2019-0088.

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AbstractOrthogonal Frequency Division Multiplexing (OFDM) is one of the popular techniques used for 4 G, 5 G and backbone optical communication networks to meet the large data transfer requirement applications. Optical Communication model based on Coherent Optical OFDM (CO-OFDM) using 4-Quadrature Amplitude Modulation (QAM), 16-QAM and 64-QAM has been evaluated by different researchers. To understand and evaluate the effects of polarization, we have proposed an Optical Communication model with Polarization Division Multiplexing (PDM). The proposed CO-OFDM PDM system has been evaluated for diff
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16

Asha, R. S., and V. K. Jayasree. "A Coherent Optical OFDM Communication System with Nonlinear Distortion Compensation in the Channel and Receiver." Journal of Optical Communications 38, no. 3 (2017). http://dx.doi.org/10.1515/joc-2016-0090.

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AbstractA simple and low-cost scheme is proposed for reducing the distortions in the coherent optical orthogonal frequency-division multiplexing (CO-OFDM) system. The total wireless channel noise and the distortions in the receiver can be considered as an additive white Gaussian noise model and all distortions can be reduced using maximum likelihood sequence estimation (MLSE) equalizers. The performance of the CO-OFDM is analyzed for different fiber lengths and laser powers. Results show that the MLSE-equalized system can outperform with a higher
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17

Chauhan, Anu, and Arti Vaish. "Incorporating SDC Module for ISI Compensation for a Long-Haul Co-OFDM System." Journal of Optical Communications, July 18, 2018. http://dx.doi.org/10.1515/joc-2018-0106.

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AbstractWith the increase in demand of bandwidth hungry applications, it is recommended to develop a high data rate system for long-haul coherent optical orthogonal frequency division multiplexing (CO-OFDM). At a very high data rate, CO-OFDM signal experiences deterioration. At 50 Gbps, the signal experiences ISI effect and in order to overcome this ISI effect, a prolonged system has been developed to reach optimal ISI compensation technique. One of the prominent and competent techniques to enhance system performance is (SDCM) symmetrical dispersion compensation module. In order to make system
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18

Fu, Minglei, Ke Meng, Zhicheng Chai, Yuling Liu, and Zichun Le. "Physical Layer Impairment Model for CO-OFDM System Considering Amplified Spontaneous Emission and Four-wave Mixing." Journal of Optical Communications 36, no. 3 (2015). http://dx.doi.org/10.1515/joc-2014-0062.

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AbstractIt’s known that different physical impairments can occur in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system. Not only linear impairments but also nonlinear impairments can cause significant signal degradations. It is important to analyze the physical layer impairment (PLI) model which should consider these impairments. In this paper, a new PLI model is developed, where amplified spontaneous emission (ASE) categorized to linear impairments and four-wave mixing (FWM) categorized to nonlinear impairments are regarded as the main noise sources. The performance
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19

Chowdhury, Ruhin, and A. K. M. Sharoar Jahan Choyon. "Design and performance analysis of spectral-efficient hybrid CPDM-CO-OFDM FSO communication system under diverse weather conditions." Journal of Optical Communications, August 2, 2021. http://dx.doi.org/10.1515/joc-2021-0113.

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Abstract A comprehensive design is proposed for the free-space optical (FSO) communication system by hybridizing circular polarization division multiplexing (CPDM) with coherent optical orthogonal frequency division multiplexing (CO-OFDM) and its performance is investigated realistically under diverse turbulent weather conditions of Bangladesh. Here, we consider Gamma–Gamma distribution for the turbulent FSO channel model. Moreover, the proposed scheme presents an excellent performance since the CPDM technique not only maximizes the link capacity of the FSO system but also enhances the spectra
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20

Padhy, Jagana Bihari, and Bijayananda Patnaik. "CO-OFDM and DP-QPSK Based DWDM Optical Wireless Communication System." Journal of Optical Communications, October 2, 2018. http://dx.doi.org/10.1515/joc-2018-0072.

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Abstract The 5 G technology provides a promising solution for future broadband networks. It requires access to high-speed wireless services for systems at anytime and anywhere. For adapting the 5 G services, this paper proposes an optical wireless system with hybrid scheme of dual polarized Gbps dense wavelength division multiplexed (DWDM) system. The multi-carrier transmission technique such as coherent optical orthogonal frequency division multiplexing (CO-OFDM) has also been incorporated into the system. The frequency spacing for the DWDM system is taken 25, 50 and 100 GHz according to the
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