Real-time closed-loop measuring and tracking method of half-wave voltage of integrated electro-optical phase modulator

Abstract

The invention discloses a real-time closed-loop measuring and tracking method of the half-wave voltage of an integrated electro-optical phase modulator. One Sagnac fiber optic interferometer is used as a measuring device, and the phase of the fiber optic interferometer is modulated by the measured integrated electro-optical phase modulator. An adopted phase modulating signal comprises four modulation steps A, B, C and D, the duration time of each modulation step equals to the transition time of the Sagnac fiber optic interferometer, the modulation voltage signals of the four modulation steps are respectively 0, V, 4V and V, and the magnitude of V is adjustable. The interferometer output signals corresponding to the phases B and C are measured by using a sampling circuit, the magnitude of V is adjusted according to an established policy until the measurement precision is met, and thus, the real-time closed-loop measurement and tracking to the half-wave voltage can be realized. The method has the characteristic of real-time measurement due to the adoption of closed-loop measurement, the method can be used for tracking the half-wave voltage, and the precision and the reliability of measurement are high and can not be influenced by the drift of the sampling circuit.

Description

technical field [0001] The invention relates to a signal processing method in an optical fiber gyroscope sensor, in particular to a real-time closed-loop measurement and tracking method for half-wave voltage of an integrated electro-optic phase modulator. Background technique [0002] Half-wave voltage is a parameter used to measure the modulation performance of integrated electro-optical phase modulators (often referred to as phase modulators, modulators, etc.), which is defined as the voltage that needs to be loaded on the modulation electrode to make the integrated electro-optical phase modulator generate π phase Voltage, half-wave voltage and electro-optic phase modulation coefficient are an equivalent parameter. Both are parameters used to describe the phase modulation efficiency of the phase modulator. The electro-optic phase modulation coefficient is defined as the ratio of the optical phase modulation generated by the phase modulator to the voltage applied to its ele...

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Problems solved by technology

[0010] In the current research on optical fiber sensing technology, the accuracy of the original integrated electro-optic modulator phase modulator electro-optic phase half-wave voltage test method is poor, or it belongs to the open-loop test method, and the test accuracy is affected by the drift of the sampling circuit, so it cannot meet the requirements The application in high-precision sensing measurement requires a new measurement method that can measure half-wave voltage more accurately to meet the current situation of application in high-precision sensing measurement. The purpose of the present invention is to provide an integrated electro-optic phase modulator half-wave Real-time closed-loop measurement and tracking method of wave voltage to achieve precise and fast closed-loop measurement and real-time tracking of half-wave voltage, and this test method has nothing to do with the drift of the test circuit

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