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Polarization fading suppression method and device

A technology of polarization fading and suppression device, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problem of polarization-induced signal fading and other problems, and achieve the effect of avoiding signal fading

Pending Publication Date: 2022-02-08
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a polarization fading suppression method and device to solve the technical problem of polarization-induced signal fading when the phase interference monitoring technology is used in the prior art

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  • Polarization fading suppression method and device
  • Polarization fading suppression method and device
  • Polarization fading suppression method and device

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Embodiment Construction

[0025] As mentioned in the background art, the random variation of the polarization direction of the light will cause the inconsistency of the polarization states of the two light beams participating in the interference, which will affect the signal. Specifically reflected in its working process, the optical fiber will be affected by the environment such as temperature. When the temperature rises, the tension on the fiber core will decrease, and the birefringence will become smaller, resulting in a change in the polarization state, which will cause the fading of the interference light intensity. lead to inaccurate sensor measurements.

[0026] In addition, the submarine cable monitor needs to detect acoustic vibrations in the submarine environment, such as vibration signals of ship engines, windlasses, and net hoists. However, the vibration signal will not only change the phase of the transmitted light in the fiber, but also change its polarization, and the polarization will a...

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Abstract

The invention discloses a polarization fading suppression method and device. The method comprises the following steps of: adjusting a light beam output by a light source into a light beam with periodically changed polarization; carrying out interference detection on the light beam with periodically changed polarization to obtain a detection signal with periodically changed intensity; and performing envelope detection on the detection signal to obtain a detection signal. According to the method and the device, the light beam output by the light source is adjusted into the light beam with the periodically changed polarization, then the detection signal is obtained after the light beam with the periodically changed polarization is subjected to interference detection; and if disturbance of an external environment occurs, non-periodic change occurs on the periodically changed light beam and is reflected in the detection signal; envelope detection is carried out on the signal, so that a light intensity change signal caused by phase change can be effectively extracted; and the disturbance can be eliminated or weakened, or the influence of external environment disturbance on polarization can be eliminated, and thus signal fading caused by polarization change is avoided.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing and measurement, in particular to a polarization fading suppression method and device. Background technique [0002] Optical fiber fingerprints use optical fiber as the transmission medium, which has the advantages of small size, light weight, easy bending, low loss, anti-electromagnetic interference, and good anti-radiation performance. It can realize the acoustic information perception function based on submarine photoelectric composite cables (hereinafter referred to as submarine cables) . The submarine cable monitor based on interferometric optical fiber fingerprint technology, if it is applied to submarine cable monitoring, can greatly improve the perception sensitivity and frequency response range of the submarine cable to the acoustic vibration in the surrounding environment, and can identify ship engines, windlasses, and nets. and underwater exploration operations and other ...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 张梓平陈硕俞恩科胡凯何旭涛
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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