Method for demultiplexing polarization by using constant rotation sign training sequence

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

Inactive Publication Date: 2014-11-19
BEIJING UNIV OF POSTS & TELECOMM
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/22H04L25/02H04L25/03
Inventor 乔耀军赵源纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap