Optical path structure for stimulated Brillouin optical fiber gyroscope

A technology of stimulated Brillouin and circuit structure, which is applied in the field of fiber optic gyroscopes, can solve the problems of large laser volume, poor shock and vibration resistance, and is not suitable for practical application requirements of miniaturized gyroscopes, and achieves enhanced scattering effect, The effect of frequency stabilization and high Brillouin gain

Inactive Publication Date: 2010-05-12
BEIHANG UNIV
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Problems solved by technology

However, the gain medium of He-Ne laser is gas, which has poor shock and vibration resistance.
Later, Nd:YAG (neodymium-doped yttrium aluminum garnet) lasers with a wavelength

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  • Optical path structure for stimulated Brillouin optical fiber gyroscope
  • Optical path structure for stimulated Brillouin optical fiber gyroscope

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Embodiment Construction

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] see figure 1 As shown, the present invention is an optical path structure of a stimulated Brillouin photonic crystal fiber optic gyroscope, which includes a narrow linewidth erbium-doped fiber laser 1, an A coupler 11, an acousto-optic frequency shifter 2, and an A fiber loop 4A, A polarization controller 5A, B coupler 12, variable attenuator 3, B fiber circulator 4B, B polarization controller 5B, C coupler 13 and photonic crystal fiber resonator 6.

[0028] The tail fiber of the narrow-linewidth erbium-doped fiber laser 1 is connected to the a port of the A coupler 11; in the present invention, the narrow-linewidth erbium-doped fiber laser 1 is used as a light source, and the central wavelength of its output is 1549nm~1551nm, and the linewidth is less than 1kHz.

[0029] The a port of the A coupler 11 is connected with the tail fiber of the narrow l...

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Abstract

The invention discloses an optical path structure for a stimulated Brillouin optical fiber gyroscope. A light source emitted by an Erbium-doped narrow-linewidth optical fiber laser is split into two beams to transmit in different paths after passing through a coupler A. One beam of light enters a photonic crystal optical fiber resonant cavity after passing through an all-optical fiber acousto-optic frequency shifter, an optical fiber circulator A, a polarization controller A and a coupler B; and the other beam of light enters the photonic crystal optical fiber resonant cavity after passing through a variable attenuator, an optical fiber circulator B, a polarization controller B and the coupler B. The two beams of light are pump light transmitting anticlockwise and pump light transmitting clockwise respectively. As the wave field of the pump light in a photonic crystal optical fiber and an elastic sound wave field interact to generate stimulated Brillouin scattering, the stimulated Brillouin scattering can be described as periodical modulation of the refractive index of a medium which is caused by the nonlinear interaction performed between pump light waves and Stokes light waves through sound waves that are generated by the electrostriction of the pump light waves.

Description

technical field [0001] The present invention relates to a fiber optic gyroscope, more particularly, to an optical path structure suitable for use as a fiber optic gyroscope. Background technique [0002] The fiber optic gyroscope is a kind of all-solid-state, truly silent gyroscope. It can be divided into an optical path structure and a circuit structure according to the difference in processing information. A photodetector is used to realize the connection between the optical path structure and the circuit structure. Fiber optic gyroscope is a kind of high reliability, long life, wide dynamic range, shock and vibration resistance, small size, light weight and suitable for mass production, etc. It can achieve high precision and has become the first choice for various inertial systems. inertial instrument. [0003] The patent application publication number is CN 101067556A, and the publication date is November 7, 2007. A four-frequency differential Brillouin fiber optic gyro...

Claims

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Application Information

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IPC IPC(8): G01C19/72
Inventor 欧攀林志立冯丽爽贾豫东李沐华刘惠兰张春熹
Owner BEIHANG UNIV
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