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Apparatus and method for testing power spectral density of frequency noise of laser based on fiber resonator

A noise power spectrum, laser technology, applied in the direction of testing optical performance, optical waveguide coupling, etc., can solve the problems of complex structure, low conversion coefficient of M-Z interferometer, etc., achieve high sensitivity, high definition, suppress intensity noise effect

Inactive Publication Date: 2012-09-26
ZHEJIANG UNIV
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Problems solved by technology

At present, the common method of testing laser frequency noise power spectral density is to use the linear region of the M-Z interferometer to convert frequency fluctuations into voltage fluctuations, but the conversion coefficient of the M-Z interferometer is low and the structure is relatively complicated.

Method used

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  • Apparatus and method for testing power spectral density of frequency noise of laser based on fiber resonator
  • Apparatus and method for testing power spectral density of frequency noise of laser based on fiber resonator
  • Apparatus and method for testing power spectral density of frequency noise of laser based on fiber resonator

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Embodiment Construction

[0016] Such as figure 1 As shown, the device for testing laser frequency noise power spectral density based on a fiber resonator includes a laser 1, a phase modulator 2, a fiber resonator 3, a photodetector 4, a spectrum analyzer 5, a lock-in amplifier 6, and a servo controller 7; Laser 1, phase modulator 2, fiber resonator 3, photodetector 4, lock-in amplifier 6, servo controller 7 are connected in sequence, servo controller 7 is connected to fiber resonator 3, photodetector 4 is connected to spectrum analyzer 5 are connected; the frequency noise of the laser 1 is converted into amplitude fluctuations through the fiber resonator 3, and the power spectral density of the frequency noise of the laser is detected on the spectrum analyzer 5.

[0017] Such as figure 2 As shown, the phase modulator 2 includes a straight waveguide 8, a pair of electrodes 9, an input fiber 10 and an output fiber 11; a pair of electrodes 9 are arranged on both sides of the straight waveguide 8, and ...

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Abstract

The invention discloses an apparatus and a method for testing the power spectral density of a frequency noise of a laser based on a fiber resonator. The apparatus comprises a laser, a phase modulator, a fiber resonator, a photoelectric detector, a spectrum analyzer, a lock-in amplifier and a servo controller. The laser, the phase modulator, the fiber resonator, the photoelectric detector, the lock-in amplifier and the servo controller are connected in serial, wherein the servo controller is connected to the fiber resonator and the photoelectric detector is connected to the spectrum analyzer. The frequency noise of the laser is converted to amplitude fluctuation through the fiber resonator and the power spectral density of the frequency noise of the laser is tested on the spectrum analyzer. The apparatus has high sensitivity, prevents the influence of the laser intensity noise, detects fast fluctuation of the frequency noise, can be combined with frequency noise inhibition of a resonator optic gyroscope, inhibits laser-frequency noise effectively, improves detection precision of the resonator optic gyroscope, and has important scientific significance and application value.

Description

technical field [0001] The invention relates to a device and method for testing laser frequency noise power spectral density based on a fiber resonator. By accurately measuring laser frequency noise power spectral density, it is beneficial to analyze the influence of laser frequency noise in various optical fiber sensing, such as resonance type optical gyroscope. Background technique [0002] Resonator Optic Gyroscope (ROG: Resonator Optic Gyroscope) is a high-precision inertial sensor based on the Sagnac effect to detect angular velocity. It obtains the rotational angular velocity of an object by detecting the resonance frequency difference generated by light propagating clockwise and counterclockwise in the optical resonant cavity. [0003] The angular velocity information of the resonant optical gyro is loaded on the frequency, and the huge frequency noise of the laser itself will overwhelm the weak angular velocity signal, so it is extremely important to test the frequen...

Claims

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Application Information

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IPC IPC(8): G01M11/02G02B6/28
Inventor 俞旭辉马慧莲金仲和
Owner ZHEJIANG UNIV
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