Influence of the nonlinear propagation effect on the optical signal-to-noise ratio of 400G optical fiber communication systems

2017 ◽  
Vol 15 (3) ◽  
pp. 030604-30608 ◽  
Author(s):  
Huaqiang Qin Huaqiang Qin ◽  
Xiaosheng Xiao Xiaosheng Xiao
Keyword(s):  
Optical Fiber ◽  
Communication Systems ◽  
Signal To Noise Ratio ◽  
Optical Fiber Communication ◽  
Optical Signal ◽  
Nonlinear Propagation ◽  
Propagation Effect ◽  
Signal To Noise ◽  
Fiber Communication ◽  
Noise Ratio

High-speed signal processing and wide band optical semiconductor amplifier in the optical communication systems

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hazem M. El-Hageen ◽  
Aadel M. Alatwi ◽  
Ahmed Nabih Zaki Rashed
Keyword(s):  
Optical Communication ◽  
Communication Systems ◽  
High Speed ◽  
Noise Figure ◽  
Signal To Noise Ratio ◽  
Local Area ◽  
Optical Signal ◽  
Signal To Noise ◽  
Optical Communication Systems ◽  
Noise Ratio

AbstractThis work clarifies the analysis of the theoretical study of noise and transmission gain characteristics of semiconductor optical amplifiers (SOAs), which are relevant in the novel local area optical communication systems. We investigated the effects of noise on AlGaAs/GaAs SOA transmission performance through the measurement of output power, optical gain, the optical signal-to-noise ratio, and noise figure. It was observed that noise has a dramatic effect on SOAs’ operation transmission efficiency, and the performance of the amplifier structure may be limited. If the drive current and injection power at the SOA can be changed and its active region length modified, then the variation of gain, optical signal-to-noise ratio, and noise figure at the output of the structure can be obtained.

Long-haul coherent optical fiber communication systems using optical amplifiers

1991 ◽  
Vol 9 (2) ◽  
pp. 251-260 ◽  
Author(s):  
S. Ryu ◽  
S. Yamamoto ◽  
H. Taga ◽  
N. Edagawa ◽  
Y. Yoshida ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Communication Systems ◽  
Optical Amplifiers ◽  
Optical Fiber Communication ◽  
Fiber Communication

scholarly journals NOISE STABILITY OF SIGNAL RECEPTION ALGORITHMS WITH MULTIPULSE PULSE-POSITION MODULATION

2018 ◽  
Vol 42 (1) ◽  
pp. 167-174 ◽  
Author(s):  
V. I. Parfenov ◽  
D. Y. Golovanov
Keyword(s):  
Communication Systems ◽  
Pulse Sequence ◽  
Signal To Noise Ratio ◽  
Point Of View ◽  
Estimation Accuracy ◽  
Pulse Position Modulation ◽  
Signal To Noise ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Noise Ratio

An algorithm for estimating time positions and amplitudes of a periodic pulse sequence from a small number of samples was proposed. The number of these samples was determined only by the number of pulses. The performance of this algorithm was considered on the assumption that the spectrum of the original signal is limited with an ideal low-pass filter or the Nyquist filter, and conditions for the conversion from one filter to the other were determined. The efficiency of the proposed algorithm was investigated through analyzing in which way the dispersion of estimates of time positions and amplitudes depends on the signal-to-noise ratio and on the number of pulses in the sequence. It was shown that, from this point of view, the efficiency of the algorithm decreases with increasing number of sequence pulses. Besides, the efficiency of the proposed algorithm decreases with decreasing signal-to-noise ratio.It was found that, unlike the classical maximum likelihood algorithm, the proposed algorithm does not require a search for the maximum of a multivariable function, meanwhile characteristics of the estimates are practically the same for both these methods. Also, it was shown that the estimation accuracy of the proposed algorithm can be increased by an insignificant increase in the number of signal samples.The results obtained may be used in the practical design of laser communication systems, in which the multipulse pulse-position modulation is used for message transmission. 

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