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Hollow-core photonic crystal fiber resonant gyroscope based on free-form surface lens coupling

A technology of hollow-core photonic crystals and curved lenses, which is applied in the field of inertial sensing technology and integrated optics, can solve the problems of less lens reports, achieve reduced volume and installation difficulty, insensitivity to environmental changes, and simplify preparation and installation processes Effect

Active Publication Date: 2021-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the current spatial light coupling schemes are a combination of plane beam splitters and general lenses, and there are relatively few reports on lenses designed by free-form surfaces.

Method used

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  • Hollow-core photonic crystal fiber resonant gyroscope based on free-form surface lens coupling
  • Hollow-core photonic crystal fiber resonant gyroscope based on free-form surface lens coupling
  • Hollow-core photonic crystal fiber resonant gyroscope based on free-form surface lens coupling

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preparation example Construction

[0041] The preparation process of the fiber resonator gyroscope of the present invention comprises the following steps:

[0042] 1) Connect to an optical transmission system, including a narrow linewidth laser light source 1, a first polarization maintaining fiber 2, a phase modulator 3, a Y waveguide 4, a circulator 5, and a photodetector 6.

[0043] 2) Design the free-form surface lens coupler 9 . Wherein the second surface 10 is an ellipsoid, and the head and tail end surfaces of the hollow-core optical fiber ring 11 are on the two foci of the long axis of the ellipsoid, which can satisfy mutual coupling after being reflected by the ellipsoid. The intersection of the extension lines at both ends of the hollow-core optical fiber ring 11 coincides with the center of the ellipsoid.

[0044] 3) According to the designed second surface 10, the first surface 8 can be designed with a free-form surface, and the first surface 8 can be designed with a bicoinczernike surface, so that...

Embodiment

[0049] In this embodiment, the hollow-core photonic crystal fiber resonator gyro based on the free-form surface lens, the first polarization-maintaining fiber 2 is HC-1550-02 type, the center wavelength of the narrow-linewidth laser light source 1 is 1550nm, and the material of the free-form surface lens coupler 9 for BK7;

[0050] like figure 1 As shown, the light emitted by the narrow-linewidth laser source 1 enters the first polarization-maintaining optical fiber 2, and the phase modulator 3, Y waveguide 4, circulator 5, and photodetector 6 are arranged in sequence along the direction of the optical path. The free-form surface lens coupler 9, the polarization beam splitting prism 13, and the hollow fiber ring 11 form a resonant cavity. The head and tail end faces of the second polarization-maintaining fiber 7 , the free-form surface lens coupler 9 , the polarizing beam splitting prism 13 , and the hollow-core fiber ring 11 are mounted together on an etched silicon chip 12 ...

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Abstract

The invention discloses a hollow-core photonic crystal fiber resonant gyroscope based on free-form surface lens coupling. Light emitted by a narrow linewidth laser light source passes through a first polarization maintaining optical fiber and then is modulated by a phase modulator to reach a Y waveguide, and the Y waveguide divides the light into two beams of light with equal light intensity; the two beams of light respectively pass through two circulators, are emitted from corresponding second polarization maintaining optical fibers, are coupled through a free-form surface lens coupler and a polarization beam splitter prism, and then enter a hollow-core optical fiber ring; one part of light in the hollow-core optical fiber ring is reflected by the free-form surface lens coupler and then resonates in the hollow-core optical fiber ring, and the other part of light in the hollow-core optical fiber ring passes through the free-form surface lens coupler, then returns to the second polarization maintaining optical fibers, passes through the corresponding circulator and then reaches a corresponding photoelectric detector. The hollow-core photonic crystal fiber resonant gyroscope has the advantages of high integration level, few coupling parts, reduction of relative position errors among elements, more compact overall structure and improvement of the reliability and environmental adaptability; and the manufacturing process is simple in flow and high in stability.

Description

technical field [0001] The invention belongs to the field of inertial sensing technology and integrated optics, and relates to a hollow-core photonic crystal fiber gyroscope in a space light coupling mode. Background technique [0002] With the development of inertial technology, the volume and weight of the inertial system in the application field are getting higher and higher, and the design of an integrated, miniaturized, low-cost and high-stability optical gyroscope becomes inevitable. Compared with traditional single-mode fiber, polarization-maintaining fiber has lower insertion loss, less nonlinearity, and is insensitive to environmental changes. In recent years, polarization-maintaining fibers have been increasingly used in the fabrication of resonant cavities of resonant gyroscopes. However, the current optical fiber fusion splicing process is not compatible with polarization-maintaining optical fibers, and high insertion loss often occurs at the splicing point when...

Claims

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Application Information

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IPC IPC(8): G01C19/72G01C25/00
CPCG01C19/72G01C19/721G01C25/005
Inventor 佘玄范文申何良陈侃毕然舒晓武
Owner ZHEJIANG UNIV
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