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
CN102904643AActive Publication Date: 2013-01-30FUDAN UNIV
5 Cites 15 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
FUDAN UNIV
Publication Date
2013-01-30

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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...

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