Optical fiber phase compensator and use method thereof

Abstract

The invention provides an optical fiber phase compensator and a use method of the optical fiber phase compensator. A laser of a single longitudinal mode laser device of the optical fiber phase compensator is divided into two beams through an optical fiber coupler, one beam is input into a first wavelength division multiplexer and transmitted to a transmission optical fiber along with a transmission optical signal, one end of the transmission optical fiber is wound around piezoelectric ceramics (PZT), the other end of the transmission optical fiber is connected with a second wavelength division multiplexer, an output single longitudinal mode laser signal is reflected by a second optical fiber reflecting mirror and returned through the transmission optical fiber, interference between the optical fiber coupler and the local single longitudinal model laser signal is generated, an interference optical signal enters a feedback control circuit, a control signal controls the PZT flexible range, an upper optical fiber optical path of the PZT is changed, and phase compensation is conducted on the transmission optical signal. The use method comprises the steps that a stable phase point of the optical fiber phase compensator is firstly set and automatic phase compensation is conducted by the PZT; when the adjustment limitation of the PZT is reached, reset is conducted. The stable phase transmission distance of one-level compensation reaches 25 km and a cascade optical fiber phase compensator can be formed through multiple levels.

Description

technical field [0001] The invention relates to the technical field of optical fiber communication, in particular to an optical fiber phase compensator and a method for using the same, so as to accurately compensate the jitter error caused by the optical path change of the transmitted optical signal. Background technique [0002] Affected by changes in ambient temperature, single-mode optical fibers will experience thermal expansion and contraction as well as changes in the refractive index. Vibrations in the environment will also cause small changes in the refractive index of the optical fiber. Changes in these environmental factors will cause the transmission of optical signals in the optical fiber The optical path changes and jitter occurs. Special optical signal transmission systems such as optical fiber timing system and phase-correlated high-speed optical fiber radio frequency signal transmission (ROF) system have very high requirements on the accuracy of the optical p...

AI Technical Summary

Problems solved by technology

Special optical signal transmission systems such as optical fiber timing system and phase-correlated high-speed optical fiber radio frequency signal transmission (ROF) system have very high requirements on the accuracy of the optical path. The influence of ambient temperature and vibration on the optical fiber often makes the optical path jitter error of the system greatly exceed the tolerance. , seriously reducing the performance of the system

However, long-distance optical fibers cannot avoid the influence of ambient temperature and vibration. When the existing phase-correlated high-speed optical fiber radio frequency signal transmission (ROF) system transmits 10GHz carrier signals, it must satisfy the condition that the phase deviation is less than 5°, and the transmission distance is less than 50 meters.

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