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Temperature compensation method for half-wave voltage of integrated electro-optical phase modulator

A phase modulator and half-wave voltage technology, which is applied in the fields of instruments, optics, nonlinear optics, etc., can solve the problems of half-wave voltage phase drift, etc., and achieve the effects of reducing phase drift, stable and reliable functions, and improving stability

Inactive Publication Date: 2013-09-18
ZHEJIANG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a temperature compensation method for the half-wave voltage of the integrated electro-optical phase modulator to solve the problem that the half-wave voltage changes with temperature in the current research on the integrated electro-optic phase modulator.

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  • Temperature compensation method for half-wave voltage of integrated electro-optical phase modulator

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Embodiment Construction

[0024] The half-wave voltage of the integrated electro-optic phase modulator varies with temperature, that is, V π =f(t), if the least square method is used for linear fitting, the approximate expression can be obtained as follows:

[0025] V π = a×t+b (1)

[0026] Among them, V π is the half-wave voltage, a is the temperature coefficient, and the dimension is V / ℃; b is a constant, and the dimension is V.

[0027] The above expression is approximate to the relationship between the actual half-wave voltage and temperature. If a high-order model is used to fit "V π =f(t)" relation, will be closer to the actual change law.

[0028] A certain voltage is applied to the modulation electrode of the integrated electro-optic phase modulator, and the light propagating through it will produce a corresponding phase change. Combining with formula (1), the corresponding relationship can be obtained as follows:

[0029] φ=π×V out / V π =π×V out / (a×t+b) (2)

[0030] Among them, φ is ...

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Abstract

The invention discloses a temperature compensation method for a half-wave voltage of an integrated electro-optical phase modulator. A modulation voltage temperature compensation circuit is constructed by using a thermistor, an input voltage which is a modulation voltage before compensation and an output voltage which is a modulation voltage after compensation are applied to an electrode of the integrated electro-optical phase modulator, and the temperature characteristic of the half-wave voltage is compensated, therefore, the modulation stability of the integrated electro-optical phase modulator is enhanced, the phase shift is decreased, and the stability of a scale factor can be increased when the method is used in a fibre optic gyro. By adopting the method, the effective compensation for the half-wave voltage temperature characteristic of the integrated electro-optical phase modulator can be achieved, the function is stable and reliable, and the phase shift of the integrated electro-optical phase modulator is effectively decreased.

Description

technical field [0001] The invention relates to a temperature compensation method for the half-wave voltage of an integrated electro-optic phase modulator. Background technique [0002] The integrated electro-optical phase modulator is the core device of the digital closed-loop fiber optic gyroscope, and a certain voltage is applied to the modulation electrode to cause the corresponding phase change of the propagating light wave. When light waves propagate through When the phase changes, the voltage loaded on the modulation electrode is called the half-wave voltage, denoted as V π . [0003] The relationship expression between half-wave voltage and other influencing factors is: V π =b×λ / (n 3 e ×γ×L×Γ), where b is the electrode spacing, λ is the wavelength of the light wave that propagates through, and n e is the refractive index of lithium niobate crystal, γ is the electro-optic coefficient of the crystal, L is the length of the modulation waveguide, and Γ is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/03
Inventor 周虎薛宁王磊刘承陈杏藩
Owner ZHEJIANG UNIV
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