Method for compressing low-frequency phase noise in optical fiber transmission process

A technology of phase noise and optical fiber transmission, applied in the field of optics, can solve problems such as inability to accurately compress low-frequency phase noise, achieve the effect of compressing low-frequency phase noise and avoiding interference

Inactive Publication Date: 2014-07-09
SHANXI UNIV
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Problems solved by technology

[0005] In order to solve the problem that the existing method for compressing phase noise without frequency selective feedback cannot accurately compress low-frequency phase noise, the present invention provides a method that can effectively compress low-frequency phase noise

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  • Method for compressing low-frequency phase noise in optical fiber transmission process
  • Method for compressing low-frequency phase noise in optical fiber transmission process
  • Method for compressing low-frequency phase noise in optical fiber transmission process

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Embodiment Construction

[0023] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] Such as figure 1 As shown, a method for compressing low-frequency phase noise in optical fiber transmission includes the following steps:

[0025] (1) Narrow linewidth laser (NP Photonics company, model RFLG-25-1-1550.00-UNL, linewidth 600Hz) outputs light with a wavelength of 1550nm, which passes through fiber optic isolator FOI (connet company) and fiber attenuator FOA in turn (connet company) and then divided into two beams of reference light and signal light with a light intensity ratio of 1:9; the phase of the light source emitted by the laser is φ ref .

[0026] (2), the initial phase is φ ref The signal light passes through the acousto-optic modulator AOM 1 (GOOCH & HOUSEGO Company, Model M200-2J-F2S) After frequency shifting, the phase becomes φ ref +φ 1 , the acousto-optic modulator AOM 1 The driving frequency is variabl...

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Abstract

The invention relates to a phase noise compression technology, in particular to a method for accurately eliminating low-frequency phase noise in the optical fiber transmission process. According to the method, the problem that due to the fact that in the prior art, noise in different frequency bands is different in contribution to a feedback loop, the phase noise cannot be accurately eliminated is solved, a low-frequency portion in the phase noise is extracted through a low-pass filter and is fed back, and the low-frequency phase noise is effectively compressed; proportional integral differential processing is carried out on noise signals, then the processed noise signals are fed back to an acousto-optic modulator, frequency shifting is carried out on light beams through the acousto-optic modulator to adjust the phase, and finally accurate compression of the low-frequency phase noise is achieved. According to the method for accurately eliminating the low-frequency phase noise in the optical fiber transmission process, the problem that the low-frequency phase noise cannot be effectively eliminated through an existing compensation method is effectively solved, and the method is suitable for phase noise processing of an optical fiber transmission system for quantum secret key distribution, coherence measurement and the like.

Description

technical field [0001] The invention belongs to the field of optics and relates to a compression technology for phase noise introduced by optical fiber transmission, in particular to a method for detecting phase noise through heterodyne beat frequency and extracting feedback signals with a low-pass filter to realize compression of low-frequency phase noise. Background technique [0002] In recent years, narrow-linewidth lasers have been widely used in optical communication, optical precision measurement, and high-resolution laser spectroscopy research. During the long-distance optical fiber transmission of the beam, due to the influence of environmental changes, the refractive index of the optical fiber and other factors change randomly, which makes the phase and polarization of the laser light during the transmission process change randomly, and phase noise is introduced. Phase noise will lead to broadening of the narrow-linewidth laser beam transmitted through the fiber, r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2507
Inventor 刘令令于波张国峰秦成兵肖连团贾锁堂
Owner SHANXI UNIV
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