To see the other types of publications on this topic, follow the link: Optical repeater.

Journal articles on the topic 'Optical repeater'

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 'Optical repeater.'

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

Silberberg, Y. "All-optical repeater." Optics Letters 11, no. 6 (1986): 392. http://dx.doi.org/10.1364/ol.11.000392.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

GILES, C. R., TINGYE LI, T. H. WOOD, C. A. BURRUS, and D. A. B. MILLER. "ALL-OPTICAL REPEATER." Optics News 14, no. 12 (1988): 33. http://dx.doi.org/10.1364/on.14.12.000033.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Yamamoto, Y. "The Quantum Optical Repeater." Science 263, no. 5152 (1994): 1394–95. http://dx.doi.org/10.1126/science.263.5152.1394.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ogasawara, Yukitoshi, and Wataru Natsu. "A Cost-Effective Approach to the Risk Reduction of Cable Fault Triggered by Laying Repeaters of Fiber-Optic Submarine Cable Systems in Deep-Sea." Journal of Marine Science and Engineering 9, no. 9 (2021): 939. http://dx.doi.org/10.3390/jmse9090939.

Full text
Abstract:
Long-distance submarine cable systems, such as the transoceanic system, generally consist of a series of cables and repeaters. Repeater units are spaced at regular intervals to boost the attenuated optical signal and presently contain optical amplifiers in a pressure vessel made of copper alloy. Since the repeater unit is more massive than the cable, it pulls the cable catenary locally toward the seabed. In the 1990s, several studies numerically simulated cable behavior in the water and showed that the seabed slack runs short, and the seabed cable tension increases just before the repeater reaches the seabed. Therefore, it has been pointed out that an unarmored cable with a polyethylene sheath can be easily damaged. However, no reports have been published regarding the actual situation of cable faults related to the laying of repeaters. This study quantitatively analyzes the mechanism of cable damage related to the laying of repeaters, based on experiments, simulations, maintenance records, and a comparative analysis between the simulation results and actual cable faults. Cost-effective methods to mitigate cable faults triggered by laying a repeater in the deep sea are also explored to ensure mechanical stability during the design lifetime.
APA, Harvard, Vancouver, ISO, and other styles
5

Aiki, M., T. Tsuchiya, and M. Amemiya. "446 Mbit/s integrated optical repeater." Journal of Lightwave Technology 3, no. 2 (1985): 392–99. http://dx.doi.org/10.1109/jlt.1985.1074201.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Marra, G., D. M. Fairweather, V. Kamalov, et al. "Optical interferometry–based array of seafloor environmental sensors using a transoceanic submarine cable." Science 376, no. 6595 (2022): 874–79. http://dx.doi.org/10.1126/science.abo1939.

Full text
Abstract:
Optical fiber–based sensing technology can drastically improve Earth observations by enabling the use of existing submarine communication cables as seafloor sensors. Previous interferometric and polarization-based techniques demonstrated environmental sensing over cable lengths up to 10,500 kilometers. However, measurements were limited to the integrated changes over the entire length of the cable. We demonstrate the detection of earthquakes and ocean signals on individual spans between repeaters of a 5860-kilometer-long transatlantic cable rather than the whole cable. By applying this technique to the existing undersea communication cables, which have a repeater-to-repeater span length of 45 to 90 kilometers, the largely unmonitored ocean floor could be instrumented with thousands of permanent real-time environmental sensors without changes to the underwater infrastructure.
APA, Harvard, Vancouver, ISO, and other styles
7

Suzuki, N., M. Ohashi, and M. Nakamura. "A proposed vertical-cavity optical repeater for optical inter-board connections." IEEE Photonics Technology Letters 9, no. 8 (1997): 1149–51. http://dx.doi.org/10.1109/68.605532.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Tatekura, K., H. Yamamoto, H. Wakabayashi, and Y. Niiro. "Reliability of the OS-280M Optical Submarine Repeater." IEEE Journal on Selected Areas in Communications 4, no. 7 (1986): 1104–11. http://dx.doi.org/10.1109/jsac.1986.1146423.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Shiltsin, A. V., and M. S. Kostin. "Simulation of subnanosecond radio pulse electro-optical repeater." Russian Technological Journal 10, no. 1 (2022): 50–59. http://dx.doi.org/10.32362/2500-316x-2022-10-1-50-59.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Darlis, Arsyad Ramadhan, Lucia Jambola, Lita Lidyawati, and Adisty Hanny Asri. "Optical repeater for indoor visible light communication using amplify-forward method." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 3 (2020): 1351–60. https://doi.org/10.11591/ijeecs.v20.i3.pp1351-1360.

Full text
Abstract:
In this paper, the implementation of an optical repeater for indoor visible light communication using the amplify-forward method was proposed. In indoor, visible light communication (VLC) can occur by transmitting information signals from lamps as a VLC transmitter toward the VLC receiver as line-ofsight (LOS) that is located with only a few meters. In the non-los (NLOS) Communication, the signal will be attenuated, so it needs to amplify to improve good signal quality in a VLC receiver. The optical repeater could be used to improve the signal quality that attenuating due to distance. The audio signal was generated and sent using VLC Transmitter toward the light emitting diode (LED). Then, the electrical signal was converted to become visible light, and it was amplified using an optical amplifier with an amplify-forward method. The signal in the form of visible light that had been amplified would be received by the photodiode (PD), and the VLC receiver processed it. The measurement results showed the system that used the optical repeater could improving the distance until 9.5 m with frequency 6000 Hz, where the best signal quality at a frequency of 3000 Hz. The measurement result showed that the use of repeater components with the amplify-forward method for VLC systems, especially in the room, can increase the range until 4.5 m compare without an optical repeater. This result exceeds the minimum distance of an indoor visible light communication system, with an average distance of the roof to the floor is 3.5 m.
APA, Harvard, Vancouver, ISO, and other styles
11

Darlis, Arsyad Ramadhan, Lucia Jambola, Lita Lidyawati, and Adisty Hanny Asri. "Optical repeater for indoor visible light communication using amplify-forward method." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 3 (2020): 1351. http://dx.doi.org/10.11591/ijeecs.v20.i3.pp1351-1360.

Full text
Abstract:
<p><span>In this paper, the implementation of an optical repeater for indoor visible light communication using the amplify-forward method was proposed. In indoor, Visible Light Communication (VLC) can occur by transmitting information signals from Lamps as a VLC transmitter toward the VLC receiver as Line-of-Sight (LOS) that is located with only a few meters. In the Non-LOS (NLOS) Communication, the signal will be attenuated, so it needs to amplify to improve good signal quality in a VLC receiver. The optical repeater could be used to improve the signal quality that attenuating due to distance. The audio signal was generated and sent using VLC Transmitter toward the Light Emitting Diode (LED). Then, the electrical signal was converted to become visible light, and it was amplified using an optical amplifier with an amplify-forward method. The signal in the form of visible light that had been amplified would be received by the Photodiode (PD), and the VLC Receiver processed it. The measurement results showed the system that used the optical repeater could improving the distance until 9.5 m with frequency 6000 Hz, where the best signal quality at a frequency of 3000 Hz. The measurement result showed that the use of repeater components with the amplify forward method for VLC systems, especially in the room, can increase the range until 4.5 m compare without an optical repeater. This result exceeds the minimum distance of an indoor visible light communication system, with an average distance of the roof to the floor is 3.5 m.</span></p>
APA, Harvard, Vancouver, ISO, and other styles
12

Liang, Xiaojun, John D. Downie, and Jason E. Hurley. "Repeater Power Conversion Efficiency in Submarine Optical Communication Systems." IEEE Photonics Journal 13, no. 1 (2021): 1–10. http://dx.doi.org/10.1109/jphot.2021.3054624.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Chen, Luo-Kan, Hai-Lin Yong, Ping Xu, et al. "Experimental nested purification for a linear optical quantum repeater." Nature Photonics 11, no. 11 (2017): 695–99. http://dx.doi.org/10.1038/s41566-017-0010-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Ryu, S., and N. Takeda. "All-optical 2R repeater for coherent lightwave communication systems." Electronics Letters 31, no. 18 (1995): 1589–91. http://dx.doi.org/10.1049/el:19951060.

Full text
APA, Harvard, Vancouver, ISO, and other styles
15

Takahara, Mikio, and Kenta Noda. "Jitter characteristics of an optical repeater module using dpll." Electronics and Communications in Japan (Part I: Communications) 73, no. 12 (1990): 55–64. http://dx.doi.org/10.1002/ecja.4410731206.

Full text
APA, Harvard, Vancouver, ISO, and other styles
16

Miatto, Filippo M., Michael Epping, and Norbert Lütkenhaus. "Hamiltonians for one-way quantum repeaters." Quantum 2 (July 5, 2018): 75. http://dx.doi.org/10.22331/q-2018-07-05-75.

Full text
Abstract:
Quantum information degrades over distance due to the unavoidable imperfections of the transmission channels, with loss as the leading factor. This simple fact hinders quantum communication, as it relies on propagating quantum systems. A solution to this issue is to introduce quantum repeaters at regular intervals along a lossy channel, to revive the quantum signal. In this work we study unitary one-way quantum repeaters, which do not need to perform measurements and do not require quantum memories, and are therefore considerably simpler than other schemes. We introduce and analyze two methods to construct Hamiltonians that generate a repeater interaction that can beat the fundamental repeaterless key rate bound even in the presence of an additional coupling loss, with signals that contain only a handful of photons. The natural evolution of this work will be to approximate a repeater interaction by combining simple optical elements.
APA, Harvard, Vancouver, ISO, and other styles
17

Zhang, Rui, Li-Zheng Liu, Zheng-Da Li, et al. "Loss-tolerant all-photonic quantum repeater with generalized Shor code." Optica 9, no. 2 (2022): 152. http://dx.doi.org/10.1364/optica.439170.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Taga, H., S. Yamamoto, K. Mochizuki, and H. Wakabayashi. "Power penalty due to optical back reflection in semiconductor optical amplifier repeater systems." IEEE Photonics Technology Letters 2, no. 4 (1990): 279–81. http://dx.doi.org/10.1109/68.53262.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Hakamada, Y., K. Oguchi, and N. Tokura. "Repeater using two wavelengths for passive optical star networks connection." Electronics Letters 22, no. 3 (1986): 140. http://dx.doi.org/10.1049/el:19860098.

Full text
APA, Harvard, Vancouver, ISO, and other styles
20

Nadarajah, Nishaanthan, Chang Joon Chae, An Vu Tran, and Ampalavanapillai Nirmalathas. "Video Service Delivery Over a Repeater-Based Optical Access Network." IEEE Photonics Technology Letters 19, no. 20 (2007): 1637–39. http://dx.doi.org/10.1109/lpt.2007.904933.

Full text
APA, Harvard, Vancouver, ISO, and other styles
21

Horiuchi, Y., Y. Namihira, and H. Wakabayashi. "Chromatic dispersion measurements of 4564 km optical amplifier repeater system." Electronics Letters 29, no. 1 (1993): 4–6. http://dx.doi.org/10.1049/el:19930003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
22

Hayashi, Yoshihiro, Youhou Miyawaki, and Mamoru Aiki. "Remote control signal for submarine optical repeater fault location systems." Electronics and Communications in Japan (Part I: Communications) 69, no. 9 (1986): 93–99. http://dx.doi.org/10.1002/ecja.4410690911.

Full text
APA, Harvard, Vancouver, ISO, and other styles
23

Kim, Ajung, and W. Y. Shin. "Effects of optical repeater lines for reshaping on communication systems." Microwave and Optical Technology Letters 59, no. 4 (2017): 843–48. http://dx.doi.org/10.1002/mop.30406.

Full text
APA, Harvard, Vancouver, ISO, and other styles
24

Miao, De Jun, and Yi Zong Dai. "650nm Plastic Optical Fiber Transmission System." Advanced Materials Research 651 (January 2013): 870–73. http://dx.doi.org/10.4028/www.scientific.net/amr.651.870.

Full text
Abstract:
The 650nm plastic optical fiber transmission system includes 650nm optical Ethernet switch, 650nm optical network card, 650nm optical wavelength converter, 650nm photoelectric converter and 650nm optical repeater. Polymer optical fiber is used as transmission medium, the use of photoelectric technology, network technology, embedded chip and software technology, and system integration. The system can replace the existing twisted-pair copper wire LAN system.
APA, Harvard, Vancouver, ISO, and other styles
25

Nadarajah, Nishaanthan, Chang-Joon Chae, An Vu Tran, and Ampalavanapillai Nirmalathas. "Optical Layer Local Area Network Emulation in a Multifunctional Repeater-Based Optical Access Network." Journal of Optical Communications and Networking 1, no. 1 (2009): 43. http://dx.doi.org/10.1364/jocn.1.000043.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Song, Muping, Weiji Zhu, Qiaolan Xia, et al. "151-km single-end phase-sensitive optical time-domain reflectometer assisted by optical repeater." Optical Engineering 57, no. 02 (2018): 1. http://dx.doi.org/10.1117/1.oe.57.2.027104.

Full text
APA, Harvard, Vancouver, ISO, and other styles
27

Li, Zheng-Da, Rui Zhang, Xu-Fei Yin, et al. "Experimental quantum repeater without quantum memory." Nature Photonics 13, no. 9 (2019): 644–48. http://dx.doi.org/10.1038/s41566-019-0468-5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Ono, Hirotaka, and Makoto Yamada. "Power Consumption Analysis of Optical Repeater Subsystem in Multicore Fiber Link." Journal of Lightwave Technology 39, no. 14 (2021): 4629–37. http://dx.doi.org/10.1109/jlt.2021.3077651.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Hua Yun, 华芸, 桂有珍 Gui Youzhen, 杨飞 Yang Fei, and 蔡海文 Cai Haiwen. "Analysis of Repeater for Time and Frequency Dissemination via Optical Fiber." Chinese Journal of Lasers 39, no. 9 (2012): 0905002. http://dx.doi.org/10.3788/cjl201239.0905002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

Tran, A. V., C. J. Chae, and R. S. Tucker. "Low-cost and scalable passive optical network architecture using remote repeater." Electronics Letters 42, no. 10 (2006): 589. http://dx.doi.org/10.1049/el:20064393.

Full text
APA, Harvard, Vancouver, ISO, and other styles
31

Ohara, M., Y. Akazawa, N. Ishihara, and S. Konaka. "High Gain Equalizing Amplifier Integrated Circuits for a Gigabit Optical Repeater." IEEE Journal of Solid-State Circuits 20, no. 3 (1985): 703–7. http://dx.doi.org/10.1109/jssc.1985.1052371.

Full text
APA, Harvard, Vancouver, ISO, and other styles
32

Malyon, D. J., L. C. Blank, W. A. Stallard, and S. Yamamoto. "5 Gbit/s optical transmission system experiment employing laser amplifier repeater." Electronics Letters 25, no. 2 (1989): 108. http://dx.doi.org/10.1049/el:19890080.

Full text
APA, Harvard, Vancouver, ISO, and other styles
33

Akatsuka, Tomoya, Takashi Goh, Hiromitsu Imai, et al. "Optical frequency distribution using laser repeater stations with planar lightwave circuits." Optics Express 28, no. 7 (2020): 9186. http://dx.doi.org/10.1364/oe.383526.

Full text
APA, Harvard, Vancouver, ISO, and other styles
34

Jabbari, Tahereh, Gleb Krylov, Stephen Whiteley, Jamil Kawa, and Eby G. Friedman. "Repeater Insertion in SFQ Interconnect." IEEE Transactions on Applied Superconductivity 30, no. 8 (2020): 1–8. http://dx.doi.org/10.1109/tasc.2020.3000982.

Full text
APA, Harvard, Vancouver, ISO, and other styles
35

Potasek, M. J., and G. P. Agrawal. "Power-dependent enhancement in repeater spacing for dispersion-limited optical communication systems." Electronics Letters 22, no. 14 (1986): 759. http://dx.doi.org/10.1049/el:19860522.

Full text
APA, Harvard, Vancouver, ISO, and other styles
36

Yoneyama, M., A. Sano, K. Hagimoto, et al. "Optical repeater circuit design based on InAlAs/InGaAs HEMT digital IC technology." IEEE Transactions on Microwave Theory and Techniques 45, no. 12 (1997): 2274–82. http://dx.doi.org/10.1109/22.643831.

Full text
APA, Harvard, Vancouver, ISO, and other styles
37

Li, Shujing, Jiaxin Bao, Qiqi Deng, Lirong Chen, and Hai Wang. "Frequency Conversion Interface towards Quantum Network: From Atomic Transition Line to Fiber Optical Communication Band." Applied Sciences 12, no. 13 (2022): 6522. http://dx.doi.org/10.3390/app12136522.

Full text
Abstract:
Quantum repeater is a key component of quantum network, and atomic memory is one of the important candidates for constructing quantum repeater. However, the atomic transition wavelength is not suitable for long-distance transmission in optical fiber. To bridge atomic memory and fiber communication, we demonstrate a frequency conversion interface from rubidium D1 line (795 nm) to the optical communication L-band (1621 nm) based on difference frequency generation. To reduce broadband noise of spontaneous Raman scattering caused by strong pumping light, we use a combination of two cascaded etalons and a Fabry-Perot cavity with low finesse to narrow the noise bandwidth to 11.7 MHz. The filtering system is built by common optical elements and is easy to use; it can be widely applied in frequency conversion process. We show that the signal-noise ratio of the converted field is good enough to reduce the input photon number below 1 under the condition of low external device conversion efficiency (0.51%) and large duration of input pulse (250 ns). The demonstrated frequency conversion interface has important potential application in quantum networks.
APA, Harvard, Vancouver, ISO, and other styles
38

Oguchi, K., Y. Hakamada, and J. Minowa. "Optical design and performance of wavelength-division-multiplexed optical repeater for fiber-optic passive star networks connection." Journal of Lightwave Technology 4, no. 6 (1986): 665–71. http://dx.doi.org/10.1109/jlt.1986.1074775.

Full text
APA, Harvard, Vancouver, ISO, and other styles
39

Moon-Cheol Jeong, Jong-Seob Lee, Sang-Yuep Kim, et al. "8 x 10-Gb/s terrestrial optical free-space transmission over 3.4 km using an optical repeater." IEEE Photonics Technology Letters 15, no. 1 (2003): 171–73. http://dx.doi.org/10.1109/lpt.2002.805768.

Full text
APA, Harvard, Vancouver, ISO, and other styles
40

Kodama, Takahiro, Keita Tanaka, Kiichiro Kuwahara, Ayumu Kariya, and Shogo Hayashida. "Depth-Adaptive Air and Underwater Invisible Light Communication System with Aerial Reflection Repeater Assistance." Information 16, no. 1 (2025): 19. https://doi.org/10.3390/info16010019.

Full text
Abstract:
This study proposes a novel optical wireless communication system for high-speed, large-capacity data transmission, supporting underwater IoT devices in shallow seas. The system employs a mirror-equipped aerial drone as a relay between underwater drones and a terrestrial station, using 850 nm optical signals for low atmospheric loss and enhanced confidentiality. Adaptive modulation optimizes transmission capacity based on SNR, accounting for air and underwater channel characteristics. Experiments confirmed an exponential SNR decrease with distance (0.6–1.8 m) and demonstrated successful 4K UHD video streaming in shallow seawater (turbidity: 2.2 NTU) without quality loss. The design ensures cost-effectiveness and stable optical alignment using advanced posture control.
APA, Harvard, Vancouver, ISO, and other styles
41

Stetsyura, Gennady Georgievich. "Synchronous execution of group operations in distributed supercomputer components and computer clusters." Program Systems: Theory and Applications 13, no. 4 (2022): 25–46. http://dx.doi.org/10.25209/2079-3316-2022-13-4-25-46.

Full text
Abstract:
This paper proposes decentralized processes for synchronizing the actions of a distributed group of active components (objects) in supercomputers and computer clusters, allowing them to move to specified states or influence the external environment synchronously. The object action depends on the current state of the object and the external environment. The actions should start with the minimum delay after the possibility of their execution is detected. Synchronization is performed by exchanging optical signals over wireless communication channels through an optical signal repeater, combining one group of objects or sequences of groups of objects (layers). Accurate distance measurement performs the compensation of possible changes in distances between objects. Group operations accelerate synchronize and simultaneously receive data from a group of distributed objects. Data processing occurs during their transfer, without increasing the time. The operation time does not depend on the quantity of data processed by the operation. A group operation is performed in a repeater containing no computational means.
APA, Harvard, Vancouver, ISO, and other styles
42

Chandel, Rajeevan, S. Sarkar, and R. P. Agarwal. "Transition time considerations in repeater‐chains." Microelectronics International 22, no. 3 (2005): 39–40. http://dx.doi.org/10.1108/13565360510610530.

Full text
APA, Harvard, Vancouver, ISO, and other styles
43

Yokota, Hirohisa, Kenji Kamoto, Jun-ichi Igarashi, Norihiko Mouri, and Yutaka Sasaki. "An ASE Reduction Filter Using Cascaded Optical Fiber Grating Couplers in EDFA Repeater." Optical Review 9, no. 1 (2002): 9–12. http://dx.doi.org/10.1007/s10043-002-0009-0.

Full text
APA, Harvard, Vancouver, ISO, and other styles
44

Dallaali, Mohammad Amin, and Malin Premaratne. "Power and dispersion constrained optimization of optical links with unequally-spaced repeater modules." Optical Fiber Technology 13, no. 4 (2007): 309–17. http://dx.doi.org/10.1016/j.yofte.2007.04.007.

Full text
APA, Harvard, Vancouver, ISO, and other styles
45

Nakashima, T., S. Seikai, M. Nakazawa, and Y. Negishi. "Theoretical limit of repeater spacing in an optical transmission line utilizing Raman amplification." Journal of Lightwave Technology 4, no. 8 (1986): 1267–72. http://dx.doi.org/10.1109/jlt.1986.1074868.

Full text
APA, Harvard, Vancouver, ISO, and other styles
46

Yoneyama, M., A. Sano, T. Kataoka, et al. "40 Gbit/s optical repeater circuit using InAlAs/InGaAs HEMT digital IC modules." Electronics Letters 33, no. 23 (1997): 1977. http://dx.doi.org/10.1049/el:19971324.

Full text
APA, Harvard, Vancouver, ISO, and other styles
47

Yamamoto, Shu, Hidenori Taga, Kiyofumi Mochizuki, and Hiroharu Wakabayashi. "Performance of a dual-stage semiconductor laser amplifier for optical transmission repeater system." Optical and Quantum Electronics 21, no. 1 (1989): S75—S88. http://dx.doi.org/10.1007/bf02117684.

Full text
APA, Harvard, Vancouver, ISO, and other styles
48

Fusco, V. F., S. L. Karode, and L. M. Chong. "Injection-locked quasicirculator-based steerable repeater array." Microwave and Optical Technology Letters 15, no. 1 (1997): 8–9. http://dx.doi.org/10.1002/(sici)1098-2760(199705)15:1<8::aid-mop3>3.0.co;2-l.

Full text
APA, Harvard, Vancouver, ISO, and other styles
49

Lipunov, Vladimir M., Viktor G. Kornilov, Kirill Zhirkov, et al. "MASTER Real-Time Multi-Message Observations of High Energy Phenomena." Universe 8, no. 5 (2022): 271. http://dx.doi.org/10.3390/universe8050271.

Full text
Abstract:
This review considers synchronous and follow-up MASTER Global Robotic Net optical observations of high energy astrophysical phenomena such as fast radio bursts (FRB), gamma-ray bursts (including prompt optical emission polarization discovery), gravitational-wave events, detected by LIGO/VIRGO (including GW170817 and independent Kilonova discovery), high energy neutrino sources (including the detection of IC-170922A progenitor) and others. We report on the first large optical monitoring campaign of the closest at that moment radio burster FRB 180916.J0158+65 simultaneously with a radio burst. We obtained synchronous limits on the optical flux of the FRB 180916.J0158+65 and FRB 200428 (soft gamma repeater SGR 1935+2154)(The CHIME/FRB Collaboration, Nature 2020, 587) at 155093 MASTER images with the total exposure time equal to 2,705,058 s, i.e., 31.3 days. It follows from these synchronous limitations that the ratio of the energies released in the optical and radio ranges does not exceed 4 × 105. Our optical monitoring covered a total of 6 weeks. On 28 April 2020, MASTER automatically following up on a Swift alert began to observe the galactic soft gamma repeater SGR 1935+2154 experienced another flare. On the same day, radio telescopes detected a short radio burst FRB 200428 and MASTER-Tavrida telescope determined the best prompt optical limit of FRB/SGR 1935+2154. Our optical limit shows that X-ray and radio emissions are not explained by a single power-law spectrum. In the course of our observations, using special methods, we found a faint extended afterglow in the FRB 180916.J0158+65 direction associated with the extended emission of the host galaxy.
APA, Harvard, Vancouver, ISO, and other styles
50

Tian, Xingkang, Fan Wu, Cong Zhang, Wenhao Fan, and Yuanan Liu. "Application of Deep Convolutional Neural Network for Automatic Detection of Digital Optical Fiber Repeater." Sensors 22, no. 19 (2022): 7257. http://dx.doi.org/10.3390/s22197257.

Full text
Abstract:
The digital optical fiber repeater (DOFR) is an important infrastructure in the LTE networks, which solve the problem of poor regional signal quality. Various types of conventional measurement data from the LTE network cannot indicate whether a working DOFR is present in the cell. Currently, the detection of DOFRs relies solely on maintenance engineers for field detection. Manual detection methods are not timely or efficient, because of the large number and wide geographical distribution of DOFRs. Implementing automatic detection of DOFR can reduce the maintenance cost for mobile network operators. We treat the DOFR detection problem as a classification problem and employ a deep convolutional neural network (DCNN) to tackle it. The measurement report (MR) we used in this paper are tabular data, which is not an ideal input for DCNN. We propose a novel MR representation method that takes the overall MR data of a cell as a sample rather than a single record in the table, and represents the MR data as a pseudo-image matrix (PIM). The PIM will be used as the input for training DCNN, and the trained DCNN will be used to perform DOFR detection tasks. We conducted a series of experiments on real MR data, and the classification accuracy can achieve 93%. The proposed AI-based method can effectively detect the DOFR in a cell.
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!

To the bibliography