Effect of laser frequency offset on optical minimum-shift keying transmission system

2008 ◽  
Author(s):  
Han Chen ◽  
Yi Dong ◽  
Hao He ◽  
Weisheng Hu ◽  
Lemin Li
Keyword(s):  
Laser Frequency ◽  
Frequency Offset ◽  
Transmission System ◽  
Shift Keying

Tolerance of laser frequency offset in optical minimum-shift keying transmission systems

2009 ◽  
Vol 282 (14) ◽  
pp. 2774-2779 ◽  
Author(s):  
Han Chen ◽  
Yi Dong ◽  
Hao He ◽  
Weisheng Hu ◽  
Lemin Li
Keyword(s):  
Laser Frequency ◽  
Frequency Offset ◽  
Transmission Systems ◽  
Shift Keying

scholarly journals Laser frequency offset locking via tripod-type electromagnetically induced transparency

2014 ◽  
Vol 53 (12) ◽  
pp. 2632 ◽  
Author(s):  
Kang Ying ◽  
Yueping Niu ◽  
Dijun Chen ◽  
Haiwen Cai ◽  
Ronghui Qu ◽  
...  
Keyword(s):  
Electromagnetically Induced Transparency ◽  
Laser Frequency ◽  
Frequency Offset ◽  
Induced Transparency

scholarly journals Phase Clustering Based Modulation Classification Algorithm for PSK Signal over Wireless Environment

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Qi An ◽  
Zi-shu He ◽  
Hui-yong Li ◽  
Yong-hua Li
Keyword(s):  
Frequency Estimation ◽  
Signal To Noise Ratio ◽  
Frequency Offset ◽  
Estimation Accuracy ◽  
Modulation Classification ◽  
Electronic Warfare ◽  
Wireless Communication Network ◽  
Shift Keying ◽  
Analytical Formulas ◽  
Fractional Function

Promptitude and accuracy of signals’ non-data-aided (NDA) identification is one of the key technology demands in noncooperative wireless communication network, especially in information monitoring and other electronic warfare. Based on this background, this paper proposes a new signal classifier for phase shift keying (PSK) signals. The periodicity of signal’s phase is utilized as the assorted character, with which a fractional function is constituted for phase clustering. Classification and the modulation order of intercepted signals can be achieved through its Fast Fourier Transform (FFT) of the phase clustering function. Frequency offset is also considered for practical conditions. The accuracy of frequency offset estimation has a direct impact on its correction. Thus, a feasible solution is supplied. In this paper, an advanced estimator is proposed for estimating the frequency offset and balancing estimation accuracy and range under low signal-to-noise ratio (SNR) conditions. The influence on estimation range brought by the maximum correlation interval is removed through the differential operation of the autocorrelation of the normalized baseband signal raised to the power ofQ. Then, a weighted summation is adopted for an effective frequency estimation. Details of equations and relevant simulations are subsequently presented. The estimator proposed can reach an estimation accuracy of10-4even when the SNR is as low as-15 dB. Analytical formulas are expressed, and the corresponding simulations illustrate that the classifier proposed is more efficient than its counterparts even at low SNRs.

Performance of Phase Modulation in WDM-PON Transmission System

2015 ◽  
Vol 36 (1) ◽  
Author(s):  
Li Li ◽  
Dong Zhao
Keyword(s):  
Phase Shift ◽  
Optical Fiber ◽  
Phase Modulation ◽  
High Speed ◽  
Dispersion Compensation ◽  
Transmission System ◽  
Phase Shift Keying ◽  
Modulation Formats ◽  
Differential Phase Shift ◽  
Shift Keying

AbstractThe modulation and demodulation methods of the optical Differential Quadrature Phase Shift Keying (DQPSK), Optical Differential Phase Shift Keying (DPSK) and the different modulation formats including nonreturn-to-zero (NRZ), return-to-zero (RZ), carrier-suppressed return-to-zero (CS-RZ) are introduced, studying the ability of anti-dispersion for different optical signals in the 40 Gb/s high speed transmission system. The system is simulated in optical fiber by way of dispersion compensation. And then analyzed the compensation effect of the different dispersion compensation method for different phase modulation formats. It is shown that the ability of anti-dispersion and anti-PMD is better in the CS-RZ-DQPSK modulation format, and this format has the smallest eye-opening penalty (EOP) with a wider range of power into the optical fiber.

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