Polarization shift keying modulation-demodulation method, system and method for updating self-adaptive filtering coefficients of reception end

A technology of adaptive filtering and adaptive filtering, applied in the field of coherent optical communication

Active Publication Date: 2015-04-01
WUHAN POST & TELECOMM RES INST CO LTD
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[0010] The problem to be solved by the present invention is that the ...

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  • Polarization shift keying modulation-demodulation method, system and method for updating self-adaptive filtering coefficients of reception end
  • Polarization shift keying modulation-demodulation method, system and method for updating self-adaptive filtering coefficients of reception end
  • Polarization shift keying modulation-demodulation method, system and method for updating self-adaptive filtering coefficients of reception end

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Embodiment Construction

[0054] The invention discloses a modulation and demodulation method of polarization shift keying, which completely inherits the mature hardware architecture of polarization multiplexing QPSK for sending and receiving signals, and has the advantages of immunity to phase noise of polarization shift keying, reduction of nonlinear influence of optical fiber, and the like. The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0055] Such as figure 1 As shown, the polarization shift keying modulation and demodulation method provided by the present invention comprises the following steps:

[0056] At the sending end, use QPSK (Quadrature Phase Shift Keying, Quadrature Phase Shift Keying) to modulate any QPSK signal in the X polarization direction as the X polarization signal In the direction of Y polarization, the input signal S(n) is modulated to be the same as the X polarization signal Same or opposite ...

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Abstract

The invention disclose a polarization shift keying modulation-demodulation method, a system and a method for updating self-adaptive filtering coefficients of a reception end. The polarization shift keying modulation-demodulation method comprises the following steps: at a transmission end, modulating any QPSK (quadrature phase shift keying) signal (the formula is as shown in the specification) in an X polarization direction and modulating a Y polarization signal (the formula is as shown in the specification) same as or opposite to an X polarization signal (the formula is as shown in the specification) in a Y polarization direction according to an input signal S(n) by using a QPSK manner; at the reception end, demodulating a received signal into a corresponding electric signal by using a polarization multiplexing QPSK manner and carrying out digital signal processing to reduce the input signal S(n) after ADC sampling and quantification, wherein an improved CMA method is used during the digital signal processing to update the self-adaptive filtering coefficients. The polarization shift keying modulation-demodulation method has the advantages that polarization shift keying immunity phase noise is provided, the optical fiber nonlinear influence is reduced, important function is brought to ultralong-span transmission, the signal transmission/reception completely inherits the mature hardware architecture of polarization multiplexing QPSK, the realization is simple and high practicability is achieved.

Description

technical field [0001] The invention relates to coherent optical communication, in particular to a polarization shift keying modulation and demodulation method, a system and a method for updating adaptive filter coefficients at a receiving end. Background technique [0002] The theory and experiments of coherent optical communication began in the 1980s, and it is recognized that it has the advantage of high sensitivity. Coherent optical communication also has the characteristics of good frequency selectivity and high spectral efficiency, which are conducive to the improvement of communication capacity. In addition, in coherent optical communication, the impairments to signals caused by dispersion and polarization mode dispersion are both linear impairments, and the communication channel can be modeled as a linear time-invariant system. Therefore, the linear impairment can be compensated by moderately complicated DSP (Digital Signal Processing) technology, and the dispersion ...

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Application Information

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IPC IPC(8): H04L27/227H04L27/20H04B10/556
CPCH04B10/5161H04B10/556H04L27/20H04L27/227
Inventor 曾韬
Owner WUHAN POST & TELECOMM RES INST CO LTD
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