scholarly journals 100 Gb/s wavelength division multiplexing four‐level pulse amplitude modulated transmission over 160 km using advanced optical fibres

2018 ◽  
Vol 54 (11) ◽  
pp. 699-701 ◽  
Author(s):  
J.D. Downie ◽  
J. Hurley ◽  
R. Nagarajan ◽  
T. Maj ◽  
H. Dong ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Pulse Amplitude ◽  
Optical Fibres ◽  
Wavelength Division

scholarly journals Joint Probabilistic-Nyquist Pulse Shaping for an LDPC-Coded 8-PAM Signal in DWDM Data Center Communications

2019 ◽  
Vol 9 (23) ◽  
pp. 4996 ◽  
Author(s):  
Han ◽  
Yang ◽  
Djordjevic ◽  
Yue ◽  
Wang ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Spectral Efficiency ◽  
Data Center ◽  
Pulse Shaping ◽  
Direct Detection ◽  
Signal Transmission ◽  
Ldpc Code ◽  
Pulse Amplitude ◽  
Wavelength Division ◽  
Nyquist Pulse

M-ary pulse-amplitude modulation (PAM) meets the requirements of data center communication because of its simplicity, but coarse entropy granularity cannot meet the dynamic bandwidth demands, and there is a large capacity gap between uniform formats and the Shannon limit. The dense wavelength division multiplexing (DWDM) system is widely used to increase the channel capacity, but low spectral efficiency of the intensity modulation/direct detection (IM/DD) solution restricts the throughput of the modern DWDM data center networks. Probabilistic shaping distribution is a good candidate to offer us a fine entropy granularity and efficiently reduce the gap to the Shannon limit, and Nyquist pulse shaping is widely used to increase the spectral efficiency. We aim toward the joint usage of probabilistic shaping and Nyquist pulse shaping with low-density parity-check (LDPC) coding to improve the bit error rate (BER) performance of 8-PAM signal transmission. We optimized the code rate of the LDPC code and compared different Nyquist pulse shaping parameters using simulations and experiments. We achieved a 0.43 dB gain using Nyquist pulse shaping, and a 1.1 dB gain using probabilistic shaping, while the joint use of probabilistic shaping and Nyquist pulse shaping achieved a 1.27 dB gain, which offers an excellent improvement without upgrading the transceivers.

A Cost-Effective High-Speed Radio over Fibre System for Millimeter Wave Applications

2020 ◽  
Vol 41 (2) ◽  
pp. 177-180
Author(s):  
Abhishek Sharma ◽  
Sushank Chaudhary ◽  
Deepika Thakur ◽  
Vigneswaran Dhasratan
Keyword(s):  
Millimeter Wave ◽  
Wavelength Division Multiplexing ◽  
High Frequency ◽  
High Speed ◽  
Cost Effective ◽  
Optical Fibres ◽  
60 Ghz ◽  
Wavelength Division ◽  
Millimetre Waves ◽  
Radio Over Fibre

AbstractsFuture 5 G networks can enhance their wireless capacity and speed by effectively using high-frequency millimetre waves. Radio over fibres (RoF) is the promising technology to deliver millimetre waves over optical fibres as it integrates radio domain with wireless domain. The current study employed cost-effective non-return to zero scheme to encode 10 Gbps – 60 GHz data and wavelength division multiplexing scheme to transmit four channels over 60 km optical fibre link.

Wavelength Division Multiplexing and Demultiplexing using Photonic Crystal Multi Channel Add Drop Filter: A Review

2016 ◽  
Vol 5 (4) ◽  
pp. 29
Author(s):  
BHADRA ANAMIKA ◽  
SAHU VIKAS ◽  
SHRIVASTAVA SHARAD MOHAN ◽  
ANSHU ◽  
SANGHVI ANJALI S. ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Wavelength Division Multiplexing ◽  
Wavelength Division

scholarly journals Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Georg Rademacher ◽  
Benjamin J. Puttnam ◽  
Ruben S. Luís ◽  
Tobias A. Eriksson ◽  
Nicolas K. Fontaine ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Capacity Limits ◽  
Wavelength Division ◽  
Core Networks ◽  
Space Division Multiplexing ◽  
Space Division ◽  
Data Rates ◽  
Multi Mode

AbstractData rates in optical fiber networks have increased exponentially over the past decades and core-networks are expected to operate in the peta-bit-per-second regime by 2030. As current single-mode fiber-based transmission systems are reaching their capacity limits, space-division multiplexing has been investigated as a means to increase the per-fiber capacity. Of all space-division multiplexing fibers proposed to date, multi-mode fibers have the highest spatial channel density, as signals traveling in orthogonal fiber modes share the same fiber-core. By combining a high mode-count multi-mode fiber with wideband wavelength-division multiplexing, we report a peta-bit-per-second class transmission demonstration in multi-mode fibers. This was enabled by combining three key technologies: a wideband optical comb-based transmitter to generate highly spectral efficient 64-quadrature-amplitude modulated signals between 1528 nm and 1610 nm wavelength, a broadband mode-multiplexer, based on multi-plane light conversion, and a 15-mode multi-mode fiber with optimized transmission characteristics for wideband operation.

Performance enhancement of Raman + EYDFA HOA for UD-WDM system applications

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Anurupa Lubana ◽  
Sanmukh Kaur ◽  
Yugnanda Malhotra
Keyword(s):  
Wavelength Division Multiplexing ◽  
Performance Enhancement ◽  
Optical Amplifier ◽  
Q Factor ◽  
Channel Spacing ◽  
Average Gain ◽  
Wavelength Division ◽  
System Parameters ◽  
Gain Variation ◽  
Hybrid Optical Amplifier

AbstractIn this work, we study and analyze the performance of Raman + Erbium-Ytterbium codoped fiber hybrid optical amplifier (HOA) for an ultradense wavelength division multiplexing (UD-WDM) system having 100 channels. The system has been investigated considering initial values of channel spacing and data rate of 0.1 nm (12.5 GHz) and 100 GB/s, respectively. Initially, the two important WDM system parameters—wavelength and channel spacing—have been selected and then optimization of the proposed HOA has been performed in terms of EYDFA length, pump power and Er+ concentration to achieve higher values of average gain, Q-factor and lower gain variation ratio. The optimized configuration of the HOA results in the achievement of higher value of average gain, Q-factor and gain variation ratio of 47 dB, 14 and 0.14, respectively, which confirms its viability for UD-WDM system applications.

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