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Coherent light BPSK/QPSK self-adaptive demodulation method and device

A technology of demodulation method and demodulation device, which is applied in the field of coherent optical communication, can solve problems such as inflexible application and poor versatility, and achieve the effects of evaluation, low complexity and cost, and reduced logic resources

Inactive Publication Date: 2016-11-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a coherent optical BPSK / QPSK adaptive demodulation method and device, the purpose of which is to realize BPSK / QPSK adaptive demodulation by hardware multiplexing, thereby solving the problem of existing Technical problems that cannot be flexibly applied due to weak technical versatility

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Embodiment 1

[0061] like figure 1 As shown, the main components involved in the implementation of the present invention include two ADCs, an FPGA chip, and a single-chip microcomputer chip. After the BPSK / QPSK optical signal is processed by the coherent optical front-end, I / Q two-way analog electrical signals are obtained. The two-way analog electrical signals are converted into digital signals after being sampled by two high-speed ADCs. The sampling rate of the ADC is twice the signal rate. After the data enters the FPGA, it is first converted into 64 channels of parallel data, and the data is stored in the FIFO buffer. The single-chip microcomputer reads the data in the FIFO through the serial port, and performs a format recognition algorithm to identify the modulation format of the signal. At the same time, the data in the FIFO enters the clock recovery module for clock recovery (the clock recovery algorithm has nothing to do with the modulation format). After the clock recovery, the sa...

Embodiment 2

[0063] Using the device provided in Embodiment 1 to realize the coherent optical BPSK / QPSK adaptive demodulation method provided by the present invention includes the following steps:

[0064] (1) Signal acquisition: Analog-to-digital conversion is performed on the analog electrical signals I and Q to obtain digital signals I and Q, and serial-to-parallel conversion processing is performed to obtain parallel signals.

[0065] The analog electrical signals I and Q are obtained by signal light in a coherent optical receiver through frequency mixing and balanced detection. The precision of the analog-to-digital conversion is 6 bits.

[0066] (2) format recognition: carry out format recognition for obtaining parallel signal in step (1), concrete steps are as follows:

[0067] (2-1) After performing square and quartic operations on the parallel signals, perform Fast Fourier Transform (FFT);

[0068] (2-2) Calculate the characteristic parameter α, the formula is as follows:

[00...

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Abstract

The invention discloses a coherent light BPSK / QPSK self-adaptive demodulation method and device. The method comprises the following steps: (1) signal acquisition: performing analog-digital conversion on analog electric signals I and Q to obtain digital signals I and Q, performing serial-parallel processing to obtain a parallel signal; (2) format recognition: performing format recognition on the parallel signal; (3) clock recovery: performing the clock recovery on the parallel signal to obtain the parallel signal after the clock recovery; (4) frequency offset compensation; (5) phase noise compensation; (6) judging the acquired signal after the phase noise compensation in the step (5) according to a modulation format to obtain one bit of signal. The device comprises a first A / D conversion circuit and a second A / D conversion circuit, a FPGA chip, and a single chip; the first A / D conversion circuit and the second A / D conversion circuit are used for acquiring the first analog signal and the second analog signal, and converting the acquired analog signals into the first digital signal and the second digital signal to input to the FPGA chip. Through the adoption of the method and device disclosed by the invention, the coherent light BPSK / QPSK self-adaptive demodulation is realized.

Description

technical field [0001] The invention belongs to the field of coherent optical communication, and more specifically relates to a coherent optical BPSK / QPSK adaptive demodulation method and device. Background technique [0002] As a key technology of next-generation optical communication, coherent optical communication has many advantages. Compared with the traditional direct detection system, coherent detection can obtain more signal information by mixing the signal light with the local oscillator. More importantly, with the help of high-speed digital signal processing technology, coherent optical communication can place signal reconstruction and distortion compensation at the receiving end of the system. Therefore, coherent detection makes it possible to apply high-order modulation formats and polarization state multiplexing, thereby further improving the total capacity and transmission distance of the communication system on the basis of the original time-division multiple...

Claims

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Application Information

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IPC IPC(8): H04B10/25H04B10/61H04L27/227
CPCH04B10/25H04B10/613H04B10/616H04L27/227
Inventor 罗志祥阳坚夏文娟崔晟柯昌剑
Owner HUAZHONG UNIV OF SCI & TECH
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