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Apparatus and method for inhibiting intensity noise in optical signal

A technology of intensity noise and optical signal, applied in the field of optical signal processing, can solve the problems of suppression device failure, system instability, poor optical signal processing ability, etc., and achieve the effect of improving performance, improving precision, and stable working state

Inactive Publication Date: 2013-04-03
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The operating point of the intensity modulator is easily affected by changes in environmental factors such as ambient temperature, humidity, and electromagnetic fields. The drift of the operating point of the intensity modulator will directly lead to a decline in the suppression effect of the intensity modulator on the intensity noise of the optical signal, and even make the entire The suppression device fails, so that the fiber optic gyroscope cannot work normally. This scheme does not consider the influence of the drift of the working point of the intensity modulator on the suppression effect of the intensity noise
This solution uses analog closed-loop control technology, which has the problems of poor optical signal processing capability and system instability.

Method used

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  • Apparatus and method for inhibiting intensity noise in optical signal
  • Apparatus and method for inhibiting intensity noise in optical signal
  • Apparatus and method for inhibiting intensity noise in optical signal

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Experimental program
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Embodiment 1

[0030] The structure schematic diagram of the intensity noise suppression device based on the square wave modulation tracking the working point of the intensity modulator provided by this scheme is as follows figure 2 As shown, the suppression device mainly includes: a fiber optic light source, an intensity modulator, a coupler, a photodetector, an A / D (analog-to-digital) conversion module, a control module and a D / A (digital-to-analog) conversion module. The functions of each module in the above suppression device are introduced respectively below.

[0031] The fiber optic light source is used to send out light signals through the light source driving circuit. The fiber optic power supply can be a super fluorescent fiber optic light source, which is a wide-spectrum light source.

[0032] The intensity modulator is placed between the optical fiber light source and the coupler, and is used to receive the optical signal sent by the optical fiber light source, and modulate the p...

Embodiment 2

[0078] based on figure 2 The suppressing device shown in this embodiment provides a processing flow of a method for suppressing intensity noise in an optical signal as follows Figure 9 As shown, the following processing steps are included:

[0079] Step 91: The photodetector samples the optical signal output by the intensity modulator after intensity noise suppression to obtain a voltage signal, and the A / D conversion module converts the voltage signal into a digital signal, and outputs the digital signal to the adopter A control module realized by a digital circuit.

[0080] The fiber optic light source sends out light signals through the light source driving circuit. The fiber optic power supply can be a superfluorescent fiber optic light source in the fiber optic gyroscope, which is a wide-spectrum light source. The optical input port in the intensity modulator receives the optical signal from the optical fiber light source, and suppresses the intensity noise of the opt...

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Abstract

An embodiment of the invention provides an apparatus and a method for inhibiting intensity noise in an optical signal. The method comprises the following steps of: carrying out sampling on an optical signal output by an intensity modulator to obtain a voltage signal; demodulating the voltage signal; and generating a control signal according to a demodulation result. The control signal includes a power control signal for adjusting power of the optical signal and a modulating square wave signal for adjusting a working point of the intensity modulator. The intensity modulator modulates the powerof the received optical signal according to the received power control signal in the control signal, and adjusts the working point of the intensity modulator according to the received modulating square wave signal in the control signal, so as to maintain the working point of the intensity modulator stable. The embodiment of the invention can realize effective inhibition of the intensity noise in the optical signal while ensuring the working point of the intensity modulator stable.

Description

technical field [0001] The invention relates to the technical field of optical signal processing, in particular to a device and method for suppressing intensity noise in an optical signal. Background technique [0002] As a new type of inertial angular velocity sensor that is developing extremely rapidly, the fiber optic gyro has the advantages of no moving parts and no errors caused by acceleration. It has become the main inertial device in more and more fields and has become the main research direction in the next generation of aviation field. . However, an important difference between the fiber optic gyroscope and the traditional electromechanical gyroscope is that there is a large noise, which mainly includes the noise of the broadband light source of the fiber optic gyroscope. [0003] The noise of the fiber optic gyroscope will directly affect the performance indicators such as random walk coefficient and zero bias instability of the fiber optic gyroscope, and directl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C19/72
Inventor 许文渊张春熹于海鹏李立京张晞李慧
Owner BEIHANG UNIV