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Phase-synchronized acousto-optic modulator driving device and phase-synchronized acousto-optic modulator driving method

An acousto-optic modulator, phase synchronization technology, applied in instruments, optics, nonlinear optics, etc., can solve problems such as uncertain interference terms, affecting demodulation accuracy, etc., to eliminate phase jitter, improve demodulation accuracy, and improve phase. The effect of synchronization accuracy and stability

Active Publication Date: 2017-10-13
珠海任驰光电科技有限公司
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  • Abstract
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Problems solved by technology

[0004] In the existing acousto-optic modulator drive technology, the sine wave signal and the pulse signal usually use different clock sources, and the initial phase of the sine wave signal finally obtained by each pulse is random, which leads to the introduction of uncertain interference in the demodulation process item, which affects the demodulation accuracy

Method used

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  • Phase-synchronized acousto-optic modulator driving device and phase-synchronized acousto-optic modulator driving method
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  • Phase-synchronized acousto-optic modulator driving device and phase-synchronized acousto-optic modulator driving method

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Embodiment Construction

[0040] The present invention is described in detail below in conjunction with accompanying drawing:

[0041] The invention discloses a phase synchronous acousto-optic modulator driving device, such as figure 1 As shown, including: processor, signal source, waveform shaping unit, programmable digital delay, electronic switch, analog-to-digital converter and amplification module;

[0042] The processor is connected to the signal source, the signal source, the waveform shaping unit, the programmable digital delayer and the analog-to-digital converter are sequentially connected in series, and the processor is respectively connected to the programmable digital delayer and the analog-to-digital converter;

[0043] The input end of the electronic switch is respectively connected with the signal source and the programmable digital delayer, and the output end of the electronic switch is respectively connected with the analog-to-digital converter and the amplification module.

[0044] ...

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Abstract

The invention discloses a phase-synchronized acousto-optic modulator driving device and a phase-synchronized acousto-optic modulator driving method. The phase-synchronized acousto-optic modulator driving method includes: outputting a high-frequency signal and a low-frequency signal, synchronized in clock, by a signal source; realizing high-frequency signal chopping by a rectangular wave from the low-frequency signal; adopting the chopped signal for an acousto-optic modulator. By the signal source, a wave shaping unit, a programmable digital delayer, an electronic switch, an analog-digital converter and a processer, in-phase measurement of wave shapes of the high-frequency signal before and after chopping is realized, a rectangular wave signal delay time used for wave chopping is adjusted according to a measurement result, and a closed-loop control system synchronized in phases is formed. The high-frequency signal before chopping is sent to a demodulating device to be as a local oscillating signal for orthogonal frequency mixing, phase synchronization of an acousto-optic modulator driving signal and an orthogonal frequency mixing local oscillating signal in a demodulating device is realized, and demodulating precision is improved.

Description

technical field [0001] The invention relates to the technical field of acousto-optic modulator drive, in particular to a phase-synchronized acousto-optic modulator drive device and method. Background technique [0002] Acousto-optic modulators are widely used in the field of coherent phase-sensitive optical time-domain reflectometry. This technology relies on the acousto-optic modulator to modulate the frequency of the optical signal, and the frequency-modulated optical signal is divided into local oscillator light and probe light. In the process of signal demodulation, the local oscillator light and the returned probe light are first coherent, and then the coherent signal and the driving signal of the acousto-optic modulator are down-converted and quadrature-mixed to finally obtain the measured signal. [0003] In the field of coherent phase-sensitive optical time-domain reflectometry, the driving of the acousto-optic modulator needs to be in the form of superposition of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/11
CPCG02F1/113
Inventor 崔洪亮王忠民于淼刘珉含王旭付群建常天英李亚崔鸿奎
Owner 珠海任驰光电科技有限公司
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