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Method for demultiplexing polarization by using constant rotation sign training sequence

A technology of training sequence and polarization demultiplexing, which is applied in the field of optical communication and can solve problems such as polarization demultiplexing

Inactive Publication Date: 2010-11-24
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

Aiming at the problem of polarization demultiplexing in the polarization diversity multiplexing coherent optical communication system, the present invention designs a special training sequence and related algorithm

Method used

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  • Method for demultiplexing polarization by using constant rotation sign training sequence
  • Method for demultiplexing polarization by using constant rotation sign training sequence
  • Method for demultiplexing polarization by using constant rotation sign training sequence

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Embodiment Construction

[0027] Receivers of polarization diversity multiplexing optical communication systems such as Figure 4 As shown, the coherent receiver includes a front-end processing section 413 and a digital signal processing (DSP) module 411 . The front-end processing part 413 converts the optical signal into a baseband digital signal 410 . The DSP module 411 processes the baseband digital signal 410 , performs operations such as clock synchronization, compensation for various signal impairments, and demodulation to recover data 412 . The detailed structure of DSP module 411 is as Figure 5 As shown, the output 510 of the DSP module corresponds to 412 in the coherent receiver, and the inputs 501 and 502 of the DSP module are connected to the baseband digital signal 410 in the coherent receiver. Note that the input x of the DSP circuit in 501,y in 502 is a plural number, and its relationship with 410 is:

[0028] x in =x Re +i×x Im

[0029] the y in =y Re +i×y Im

[0030] input...

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Abstract

The invention belongs to the field of optical communication, and is applied to the polarization demultiplexing of a polarization diversity multiplexing coherent optical communication system. According to the invention, for the problem of the polarization demultiplexing in the polarization diversity multiplexing coherent optical communication system, a special training sequence and related algorithms are designed. Through the method, a coherent receiver can fast, automatically and accurately perform the polarization demultiplexing. As the track of the training sequence, viewed from a planisphere, rotates along a unit circle after sign power is normalized, the training sequence provided by the invention is called a constant rotation sign training sequence. The invention discloses two processing algorithms for the constant rotation sign training sequence, which are a frequency-domain algorithm and a time-domain algorithm respectively, wherein the frequency-domain algorithm can be combined with frequency-domain dispersion compensation without adding a frequency spectrum calculation module. Through the method, the receiver does not need synchronizing with an initial position of the training sequence.

Description

technical field [0001] The invention belongs to the field of optical communication, and is applied to a polarization diversity multiplexing coherent optical communication system to perform polarization demultiplexing. Background technique [0002] Coherent optical communication can not only use high-order modulation technology and polarization diversity multiplexing technology to improve spectral efficiency, but also use adaptive digital signal processing technology to dynamically compensate signal damage. It is an important technology with broad application prospects. In the polarization diversity multiplexing coherent optical communication system, the transmitting end inputs two optical signals whose polarization directions are perpendicular to each other into the optical fiber for transmission. figure 1 Indicates the input signal of the polarization diversity multiplexing system. The transmission of optical signals in optical fibers will be affected by the polarization ...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/22H04L25/02H04L25/03
Inventor 乔耀军赵源纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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