Light source relative intensity noise suppression device using double polarization maintaining coupler

A technology of relative intensity noise and suppression device, which is applied in the direction of Sagnac effect gyroscope, etc., can solve the problems of increasing system complexity and achieve the effect of achieving relative intensity noise, reducing loss and avoiding interference

Inactive Publication Date: 2019-05-07
BEIHANG UNIV
View PDF5 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some schemes for suppressing relative intensity noise are given in the prior art, among which some circuit schemes suppress relative intensity noise by adding ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Light source relative intensity noise suppression device using double polarization maintaining coupler
  • Light source relative intensity noise suppression device using double polarization maintaining coupler
  • Light source relative intensity noise suppression device using double polarization maintaining coupler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0021] The French IXBlue company once proposed a relative intensity noise suppression method, that is, the optical path addition method. The optical path structure is as follows: figure 1 shown. The optical path structure includes ASE (amplified spontaneous emission) light source, polarizer, 50:50 polarization maintaining coupler, 95:5 polarization maintaining coupler, isolator, Y waveguide integrated optical device, polarization maintaining fiber ring and detector. The light emitted by the ASE light source passes through the polarizer to form polarized light, and is divided into two beams by a 50:50 polarization-maintaining coupler, one beam is used as signal light, and the other beam is used as reference light. : 5 polarization-maintaining couplers, the time difference between two beams of light is τ, and the suppression of relative intensity noise...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a light source relative intensity noise suppression device using a double polarization maintaining coupler, belonging to the technical field of fiber optic gyroscope. The lightsource relative intensity noise suppression device using the double polarization maintaining coupler comprises an ASE light source, a 2x2 polarization maintaining coupler, a Y-waveguide integrated optical device, a polarization maintaining fiber ring, a 95:5 polarization maintaining coupler and a detector. A 5% branch of the 95:5 polarization maintaining coupler and one branch of the 2x2 polarization maintaining coupler are welded together by a method of 90 degree melting point. The ASE light source is split into two paths of light by passing through the 2x2 polarization maintaining coupler; one path of the light is a signal light, which is divided into two paths after passing through the Y-waveguide integrated optical device and then enters into the polarization maintaining fiber ring forinterference, and the interference light is input to the 95:5 polarization maintaining coupler through the 2x2 polarization maintaining coupler; and the other path of the light is a reference light,which is input to the 95:5 polarization maintaining coupler after the 90 degree melting point. The polarization states of the interference light and the reference light are perpendicular; therefore, no interference occurs when the light is combined, and the optical power is superimposed; so that the suppression of relative intensity noise is realized; moreover, the invention has a simple structureand is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and relates to a scheme for suppressing relative intensity noise of a light source using double polarization-maintaining couplers. Background technique [0002] At present, the light source used by high-precision fiber optic gyroscopes is a wide-spectrum light source, especially the development of high-power super-fluorescent erbium-doped fiber optic light sources has greatly improved the accuracy of fiber optic gyroscopes. The optical characteristics of the erbium-doped fiber optic light source include average wavelength, spectral width and optical power of the light source, which are closely related to the performance of the gyroscope. The average wavelength with good stability can improve the stability of the scale factor of the gyroscope, the wide spectral width of the light source can reduce the coherent noise, and the high optical power can improve the minimum detection sensi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01C19/72
Inventor 徐宏杰王夏霄刘昕张春熹宋凝芳郑月孔令海
Owner BEIHANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap