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Linear digital phase demodulation method for high-spectral-efficiency coherent optical link

A technology of phase demodulation and coherent light, which is applied in the field of optical communication and digital signal processing, can solve the problems of low processing bandwidth, easy to be affected by environmental factors, and high requirements on device performance, so as to save resources, realize strict linear demodulation, Effect of Improving Spectrum Efficiency

Active Publication Date: 2021-03-19
XIDIAN UNIV
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Problems solved by technology

Homodyne detection requires strict matching of local oscillator light and signal light, which can obtain high sensitivity and low processing bandwidth, but requires an optical phase-locked loop, which has high requirements on device performance and is easily affected by environmental factors

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  • Linear digital phase demodulation method for high-spectral-efficiency coherent optical link
  • Linear digital phase demodulation method for high-spectral-efficiency coherent optical link
  • Linear digital phase demodulation method for high-spectral-efficiency coherent optical link

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Embodiment Construction

[0034] Below in conjunction with the accompanying drawings, the embodiments of the present invention are described in detail: the present embodiment is implemented on the premise of the technical solution of the present invention, and provides detailed implementation modes and specific operation procedures, but the protection scope of the present invention is not limited to the subordinates. example.

[0035] figure 1 Schematic diagram of a linear digital phase demodulation scheme for high spectral efficiency coherent optical links. The optical carrier output by CW1 is directly injected into the input end of the PDM-MZM, and the PDM-MZM performs intensity modulation and phase modulation on the two polarization states of the optical carrier, respectively. The obtained modulated signal is transmitted through the SMF. The transmitted optical signal and the local oscillator optical signal output by CW2 are injected into the ICR together to obtain the electrical signal after phot...

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Abstract

The invention discloses a linear digital phase demodulation method for a high-spectral-efficiency coherent optical link, and relates to the technical field of optical communication, the technical field of microwaves and the field of digital signal processing. The method is as shown in figure 1 in the specification, and comprises two lasers CW1 and CW2, a polarization multiplexing Mach-Zehnder modulator PDMMZM, a 25km single-mode optical fiber SMF, two polarization controllers PC1 and PC2, an integrated coherent receiver ICR, an analog-to-digital converter ADC and a digital signal processing module DSP. Intensity modulation and phase modulation are respectively carried out on two radio frequency signals RF in an optical carrier orthogonal polarization state by using PDMMZM, the polarizationstates of a modulated optical signal and a local oscillation optical signal are manually adjusted through two PCs, the modulated optical signal and the local oscillation optical signal are sent to anICR for coherent detection, and then the signals are sent to a DSP module through ADC sampling to complete linear demodulation. According to the invention, coherent detection is combined with a digital signal processing technology to realize signal demodulation. The method has the advantages of high spectral efficiency, good linearity, high sensitivity, capability of effectively suppressing phasenoise and the like.

Description

technical field [0001] The invention relates to the technical field of optical communication, microwave technology and digital signal processing, and mainly relates to using photonics technology to realize high spectral efficiency transmission of radio frequency signals and using digital signal processing to realize linear demodulation of optical phase modulation. Background technique [0002] In the field of optical communication technology, larger transmission bandwidth, larger transmission distance, higher spectral efficiency and higher reception sensitivity are always the goals pursued by researchers. The advent of the 5G era and the explosive growth of information generated by the popularization of the Internet have put forward higher requirements for the performance of communication systems. The traditional optical communication system mainly adopts the method of intensity modulation / direct demodulation (IMDD), which directly modulates the intensity of the optical carr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/516H04B10/54H04B10/556H04B10/61
CPCH04B10/504H04B10/5165H04B10/541H04B10/5561H04B10/616
Inventor 李文杰张彗星张卫鹏
Owner XIDIAN UNIV
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