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Four-phase reflection type coherent optical communication system

A coherent optical communication and reflective technology, which is applied in the field of optical communication systems, can solve problems such as the instability of optical phase-locked loops, and achieve the effect of strong confidentiality and convenient phase synchronization

Active Publication Date: 2019-07-05
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0003] The purpose of the present invention is to propose a four-phase reflective coherent optical communication system to solve the technical problem of instability of the optical phase-locked loop in the homodyne receiving coherent optical communication system in view of the defects in the background technology

Method used

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  • Four-phase reflection type coherent optical communication system
  • Four-phase reflection type coherent optical communication system
  • Four-phase reflection type coherent optical communication system

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Experimental program
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Embodiment

[0022] In this example,

[0023] Laser: 1550nm DFB Laser Diode, PM Output, up to 30mW;

[0024] Polarizing beam splitter: center wavelength 1550nm, withstand power 300mW, light type PM;

[0025] Polarization controller: center wavelength 1550nm, input optical power -20dBm to 20dBm;

[0026] Faraday rotating mirror: center wavelength 1550nm, rotation angle 45°, fiber B=250μm bare fiber;

[0027] Homodyne coherent reception: the rate is 100Gbps (high-order phase modulation can generally achieve a rate above 100G), and the differential amplification gain is 2500V / W.

[0028] The four-phase reflective coherent optical communication system obtained in the embodiment has been tested and shown, compared with the existing forward system, the BER curve is equivalent, and the longest transmission distance is about 2800km, indicating that the performance of the two is roughly the same; the reflection of the embodiment The BER comparison curves of the coherent optical system and the fo...

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Abstract

The invention discloses a four-phase reflection type coherent optical communication system, and belongs to the technical field of optical communication systems. The optical communication system comprises a laser, a reflective optical modulator, a polarization controller, a 3dB coupler, a polarization beam splitter, a homodyne coherent receiver, a digital signal processing module and an adder. According to the reflection type coherent optical communication system provided by the invention, the self-coherent demodulation technology is adopted, the signal light and the local oscillation light arefrom the same light source, the wavelength tracking of the local oscillation laser is realized without closed-loop feedback in a traditional coherent optical communication system, and the receiving part is relatively simple.

Description

technical field [0001] The invention belongs to the technical field of optical communication systems, and in particular relates to a four-phase reflective coherent optical communication system. Background technique [0002] The coherent optical fiber communication system based on homodyne reception is the mainstream in the current optical fiber communication backbone network. Because it is difficult to realize the optical phase-locked loop (OPLL) that makes the system sufficiently stable, the current coherent optical communication system generally adopts asynchronous reception combining optical and electrical. At the transmitting end, the transmitted electrical signal is input into the optical modulator, and the modulated optical signal After the gain amplifier, at the receiving end, the optical signal and the local oscillator light enter the optical coherent receiver to complete the coherent detection process. After the corresponding digital signal processing technology, t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/63H04B10/61
CPCH04B10/614H04B10/6151H04B10/63
Inventor 陈树强闫淼金诗文
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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