High order modulation formats for multi-Terabit optical communication systems

2012 ◽  
Author(s):  
Chao Lu ◽  
Shuangyi Yan ◽  
Alan Pak Tao Lau ◽  
Yuliang Gao ◽  
Qi Sui
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
High Order ◽  
Modulation Formats ◽  
Optical Communication Systems ◽  
High Order Modulation

A Cost-Benefit Analysis on Modulation Formats for 40-Gb/s Optical Communication Systems

2011 ◽  
Vol 30 (2) ◽  
pp. 87-101 ◽  
Author(s):  
Clenilson Rodrigues da Silveira ◽  
Daniel M. Pataca ◽  
Murilo A. Romero ◽  
Mônica de Lacerda Rocha
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
Cost Benefit Analysis ◽  
Cost Benefit ◽  
Benefit Analysis ◽  
Modulation Formats ◽  
Optical Communication Systems

scholarly journals Numerical Investigation of the Equalization Enhanced Phase Noise Penalty for M-Quadrature Amplitude Modulation Formats in Short-Haul Few-Mode Fiber Transmission Systems with Time-Domain Equalization

2018 ◽  
Vol 8 (11) ◽  
pp. 2182 ◽  
Author(s):  
José Delgado Mendinueta ◽  
Werner Klaus ◽  
Jun Sakaguchi ◽  
Satoshi Shinada ◽  
Hideaki Furukawa ◽  
...  
Keyword(s):  
Phase Noise ◽  
Optical Communication ◽  
Amplitude Modulation ◽  
Communication Systems ◽  
Numerical Study ◽  
Optical Signal ◽  
Quadrature Amplitude Modulation ◽  
Transmission Systems ◽  
Modulation Formats ◽  
Optical Communication Systems

The equalization enhanced phase noise (EEPN), caused by the interaction of the chromatic dispersion (CD) with the phase noise of the local oscillator (LO), has been extensively studied for single-mode optical communication systems. Few-mode fiber (FMF) transmission systems introduce a new channel impairment, the differential mode delay (DMD), which also creates EEPN and hence limits the maximum transmission distance of those systems. In this work, we numerically investigate the optical signal to noise ratio (OSNR) penalties caused by the EEPN in a 3-mode FMF transmission system at 25 GBd for quadrature phase-shift keying (QPSK), 16-quadrature amplitude modulation (QAM), 32-QAM and 64-QAM modulation formats when using the blind phase search (BPS) carrier phase recovery (CPR) algorithm, which has been demonstrated to be both robust and suitable for optical communication systems. Our numerical study assumes a short-span of FMF, modeled in the weakly-coupled regime, and includes two cases; the use of ideal mode-selective de/multiplexers at both ends of the FMF span (model A), and the use of ideal non-mode-selective de/multiplexers (model B). The results show that the EEPN has almost no effect in model A. However, EEPN produces a severe penalty in model B with the onset of the OSNR degradation starting for a DMD spread of the impulse response of about 100 symbols for all modulation formats investigated. The distribution ratio of the amount of phase noise between the transmitter and receiver lasers is also assessed for model B and we confirm that the degradation is mainly due to the phase noise of the LO.

Advanced modulation formats for short reach optical communication systems

IEEE Network ◽  
2013 ◽  
Vol 27 (6) ◽  
pp. 6-13 ◽  
Author(s):  
Li Tao ◽  
Yu Ji ◽  
Jie Liu ◽  
Alan Pak Tao Lau ◽  
Nan Chi ◽  
...  
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
Modulation Formats ◽  
Advanced Modulation Formats ◽  
Optical Communication Systems

scholarly journals Impact of Equalization-Enhanced Phase Noise on Digital Nonlinearity Compensation in High-Capacity Optical Communication Systems

Sensors ◽  
2020 ◽  
Vol 20 (15) ◽  
pp. 4149 ◽  
Author(s):  
Jiazheng Ding ◽  
Tianhua Xu ◽  
Cenqin Jin ◽  
Ziyihui Wang ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Phase Noise ◽  
Optical Communication ◽  
Communication Systems ◽  
Laser Linewidth ◽  
Dual Polarization ◽  
Transmission Systems ◽  
Modulation Formats ◽  
Information Rates ◽  
Optical Communication Systems ◽  
The Impact

Equalization-enhanced phase noise (EEPN) can severely degrade the performance of long-haul optical fiber transmission systems. In this paper, the impact of EEPN in Nyquist-spaced dual-polarization quadrature phase shift keying (DP-QPSK), dual-polarization 16-ary quadrature amplitude modulation (DP-16QAM), and DP-64QAM optical transmission systems is investigated considering the use of electrical dispersion compensation (EDC) and multi-channel digital backpropagation (MC-DBP). Our results demonstrate that full-field DBP (FF-DBP) is more susceptible to EEPN compared to single-channel and partial-bandwidth DBP. EEPN-induced distortions become more significant with the increase of the local oscillator (LO) laser linewidth, and this results in degradations in bit-error-rates (BERs), achievable information rates (AIRs), and AIR-distance products in optical communication systems. Transmission systems using higher-order modulation formats can enhance information rates and spectral efficiencies, but will be more seriously degraded by EEPN. It is found that degradations on AIRs, for the investigated FF-DBP schemes, in the DP-QPSK, the DP-16QAM, and the DP-64QAM systems are 0.07 Tbit/s, 0.11 Tbit/s, and 0.57 Tbit/s, respectively, due to the EEPN with an LO laser linewidth of 1 MHz. It is also seen that the selection of a higher-quality LO laser can significantly reduce the bandwidth requirement and the computational complexity in the MC-DBP.

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