Modulation format recognition scheme using orthogonal codewords for wavelength division multiplexing system

Rui Mao, Qi Zhang, Xiangjun Xin, Naijin Liu, Wei Zhang, Qinghua Tian, Feng Tian, Ying Tao

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A modulation format identification (MFI) scheme based on orthogonal coding scheme is proposed to solve the modulation format identification problem in wavelength division multiplexing (WDM) systems. The scheme uses sidebands to carry orthogonally encoded modulation format information. The basic orthogonal codeword is generated by the Hadamard matrix, and the codewords that are not equal to other codewords after the cyclic shift are selected. The receiving end decodes the modulation format information by using mutual information. We calculate the difference between the maximum and minimum values of the mutual information between the received symbols after cyclic shifting and the standard codewords to make the proposed scheme more robust. We numerically simulated the proposed scheme in a wavelength division multiplexing system, where its channels carry 12.5 Gbaud 4/16/64 QAM and 8/16 PSK. The simulation results show that the modulation format information in the sideband has little effect on the main band information. In the absence of symbol calibration, the receiver can still recover modulation format information from the sideband information with a high accuracy rate. Compared with the MFI algorithm based on Stokes space and the MFI based on signal amplitude performance, the proposed MFI still performs well at low OSNR, although it occupies some bandwidth resources. Moreover, this solution only requires a small number of symbols for decision, so it can achieve fast response requiring little extra storage space.

Original languageEnglish
Title of host publicationEleventh International Conference on Information Optics and Photonics, CIOP 2019
EditorsHannan Wang
PublisherSPIE
ISBN (Electronic)9781510631731
DOIs
Publication statusPublished - 2019
Externally publishedYes
Event11th International Conference on Information Optics and Photonics, CIOP 2019 - Xi'an, China
Duration: 6 Aug 20199 Aug 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11209
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

Conference11th International Conference on Information Optics and Photonics, CIOP 2019
Country/TerritoryChina
CityXi'an
Period6/08/199/08/19

Keywords

  • modulation format recognition
  • optical communication
  • orthogonal code
  • wavelength division multiplexing

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Mao, R., Zhang, Q., Xin, X., Liu, N., Zhang, W., Tian, Q., Tian, F., & Tao, Y. (2019). Modulation format recognition scheme using orthogonal codewords for wavelength division multiplexing system. In H. Wang (Ed.), Eleventh International Conference on Information Optics and Photonics, CIOP 2019 Article 112092A (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11209). SPIE. https://doi.org/10.1117/12.2548185