Multimode blind equalization algorithm applied to quadrature duobinary (QDB) frequency-spectrum-compressed polarization multiplexing signal

A multi-mode blind equalization and spectrum compression technology, which is applied in polarization multiplexing systems, multi-carrier systems, transmitter/receiver shaping networks, etc., can solve the problems of lack of algorithms and achieve high spectral efficiency

Active Publication Date: 2013-01-30
FUDAN UNIV
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Problems solved by technology

For a long time, there has been a lack of effective algorithms that can

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  • Multimode blind equalization algorithm applied to quadrature duobinary (QDB) frequency-spectrum-compressed polarization multiplexing signal
  • Multimode blind equalization algorithm applied to quadrature duobinary (QDB) frequency-spectrum-compressed polarization multiplexing signal
  • Multimode blind equalization algorithm applied to quadrature duobinary (QDB) frequency-spectrum-compressed polarization multiplexing signal

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[0042] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0043] The processing algorithm flow chart applicable to the QDB spectrum compression signal proposed by the present invention is as follows Figure 4 , 6 , 7, and Figure 8 It is a specific implementation experiment of the present invention, which adopts the proposed algorithm flow, and belongs to some embodiments of the present invention. In this specific implementation experiment, we conducted the Nquist wavelength division multiplexing test, that is, we used 11 channel multi-wavelength l...

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Abstract

The invention belongs to the technical field of optical fiber communication, in particular to a multimode blind equalization digital signal processing algorithm applied to a quadrature duobinary (QDB) frequency-spectrum-compressed polarization multiplexing signal. According to the invention, in a coherent optical communication system, the multimode-blind-equalization-based digital signal processing algorithm is adopted to realize equalization compensation and demodulation of an optical signal which is subjected to QDB frequency spectrum compression; suitable filters are adopted in an electric field or an optical field to realize the QDB frequency spectrum compression of a polarization multiplexing signal; the polarization demultiplexing of a transmitted optical signal is realized by using a cascade multimode algorithm (CMMA); frequency offset estimation is realized by using a multimode quadrature phase shift keying (QPSK) partition method; and phase retrieval is realized by using the multimode QPSK partition method and maximum likelihood estimation. By the algorithm, the frequency spectrum efficiency of the signal can be effectively improved, the transmission quality of the signal can be improved, and high-spectral-efficiency coherent optical transmission can be realized.

Description

technical field [0001] The invention belongs to the technical field of optical fiber communication, and in particular relates to a multimode blind equalization algorithm suitable for QDB spectrum compression and polarization multiplexing signals, which is used for digital signal processing at the receiving end of coherent optical communication. Background technique [0002] Quadrature Duobinary (QDB) spectrum compression technology has recently gained great attention and research interest, because this spectrum compression technology can effectively improve the spectral efficiency of the signal, compared with the traditional QPSK signal In other words, the spectral efficiency is doubled after spectral compression. At the same time, the spectrally compressed signal has a smaller bandwidth, so it is more tolerant to the dispersion damage of the optical fiber link. Especially in 100G and 200G systems, due to the addition of FEC error correction coding, etc., the channel data r...

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Application Information

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IPC IPC(8): H04B10/2569H04L25/02H04L25/03H04L27/22H04J14/06H04L27/32
Inventor 迟楠张俊文余建军
Owner FUDAN UNIV
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