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On-line testing method and device for integrated optical modulator for optic fiber gyroscope

A technology of integrated optics and fiber optic gyroscope, applied in the direction of testing optical performance, etc., can solve the problem of not being able to reflect the stability characteristics of half-wave voltage, and achieve the effect of increasing dynamic test parameters, comprehensive test parameters, and enhanced contrast

Inactive Publication Date: 2005-09-07
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the frequency of the sawtooth wave is different from the actual modulation of the fiber optic gyroscope, the retrace of the sawtooth wave has a certain delay, and the stability of the half-wave voltage and the characteristics after reset cannot be reflected in the test.

Method used

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  • On-line testing method and device for integrated optical modulator for optic fiber gyroscope
  • On-line testing method and device for integrated optical modulator for optic fiber gyroscope
  • On-line testing method and device for integrated optical modulator for optic fiber gyroscope

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Embodiment Construction

[0015] Such as figure 1 As shown, the test system of the present invention consists of a high-precision stable light source 1, an optical fiber interference optical path (optical fiber ring) 2, a photodetector and a preamplifier 3, a modulation and demodulation control part 4, a high-precision square wave and a ladder wave generator and The potentiometer 5, the output of the high-precision and stable light source 1 is connected to the input end of the Y-waveguide modulator 6 to provide light waves for the entire test system; the detector and the preamplifier 3 convert the optical interference signal of the entire test system into The electrical signal is sent to the oscilloscope 7 for display after the modulation and demodulation control 4 parts; the high-precision square wave and waveform generator and the potentiometer 5 provide the test waveform for the tested Y waveguide modulator 6 and adjust the amplitude, and the optical fiber interference optical path 2 pairs are It re...

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PUM

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Abstract

The invention relates to a method for measuring the optical gyroscope on line by the integrating optical modulator, and the measuring system comprises optical fiber interference circuits, a high-precision stable light source, a light-sensitive detector, a head amplifier, the controlling section of modem, the high precision square wave, a step wave generator and the adjustment. The method comprises the following steps: a) injecting the light source to the Y waveguide modulator after coupling, measuring the depletion, light splitting proportion of the device according to the input and output parameter; b) coupling the Y waveguide modulator with the interometer, applying the manual step wave and square wave signals to the device to be measured; c) outputting the electric signal after interference by the signal mediating system, measuring the dynamic response feature quantificationally through the slope of the reset curve which is formed after the device responses to the step wave.

Description

technical field [0001] The invention relates to an online testing method and testing device for an integrated optical modulator used in a fiber optic gyroscope. Background technique [0002] Y-waveguide integrated optics (Y-IOC) is a very critical device in fiber optic gyroscopes. It is on the photoelectric crystal material substrate, using semiconductor technology to prepare a "Y"-shaped planar optical waveguide. By applying an external electric field to the waveguide, the refractive index distribution of the waveguide is changed, thereby changing the characteristics of the light passing through it. The role of the integrated optical modulator in the fiber optic gyroscope is as follows: (1) change the phase of the passing light to realize the working point of the fiber optic gyroscope at the most sensitive position; (2) realize the closed-loop control of the fiber optic gyroscope through the modulation of the optical phase; ( 3) Realize precise beam splitting, divide one b...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 伊小素肖文王妍
Owner BEIHANG UNIV
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