Optical fiber information leakage device and method for coherent detection

Abstract

The embodiment of the invention provides an optical fiber information leakage device and method for coherent detection. The device comprises an optical communication transmitter device, a phase compensation and control device and an optical communication receiver device, The optical communication transmitter device is used for generating a BPSK optical signal with a preset code rate. The phase compensation and control device is used for setting control loop parameters according to the eye pattern opening degree proportion, so that a preset optical phase shift is kept between the BPSK optical signal and the tunable laser. The optical communication receiver device is used for adjusting the polarization states of the BPSK optical signal and the tunable laser to be aligned with the axis of theoptical mixer so as to realize coherent beat frequency of the optical signal and the tunable laser. According to the embodiment of the invention, the signal sensitivity is improved through an opticalheterodyne technology, stable beat frequency signals are realized through phase compensation and control of automatic program control, receiving and detection are facilitated, and meanwhile, the whole device adopts an all-fiber structure, so that an internal optical path is flexible, and the structure is reliable.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to an optical fiber information leakage device and method for coherent detection. Background technique [0002] The common optical fiber eavesdropping is to obtain the signal transmitted in the optical fiber by changing some physical characteristics of the optical fiber; the more practical non-intrusive eavesdropping mainly includes fiber bending coupling method, evanescent wave coupling method, V-groove method and grating Law. [0003] Aiming at the stealing system of point-to-point optical fiber communication, the NSA agency of the United States mentioned in related reports a bending detection system for point-to-point optical fiber communication, including optical fiber bending couplers, optical filters and direct photoelectric detection systems. Realize micro-bending, make a small part of the optical signal leak, and realize optical fiber signal stealing; direct p...

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Problems solved by technology

However, the direct detection system described above cannot demodulate the above coding types

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