Unlock instant, AI-driven research and patent intelligence for your innovation.

Ultranarrow double-channel filter based on symmetric sampling grating structure

A sampling grating, symmetrical structure technology, applied in the field of ultra-narrow dual-channel optical filters, can solve the problems of multi-channel intensity and bandwidth are different, the bandwidth is large, and only one response can be obtained.

Inactive Publication Date: 2009-08-26
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a kind of ultra-narrow dual-channel filter based on symmetrical sampling grating structure, which solves the problem that the traditional SFBG in the background technology realizes that the multi-channel strength and bandwidth are different, the bandwidth of each channel of the multi-channel Bragg grating filter is very large and the Technical questions that only get one response

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
  • Ultranarrow double-channel filter based on symmetric sampling grating structure
  • Ultranarrow double-channel filter based on symmetric sampling grating structure
  • Ultranarrow double-channel filter based on symmetric sampling grating structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The structure of the ultra-narrow dual-channel filter of the present invention is detailed in image 3 , mainly consists of a 3-port optical circulator, a 0 to π sampling Bragg grating SFBG 1 and a symmetric structured Bragg grating SFBG 2 composition. There are two connection relationships: the first connection relationship see image 3 (a), 0 to π sampled Bragg grating SFBG 1 Connected to the middle port A2 of the 3-port optical circulator A, symmetrical structure Bragg grating SFBG 2 Connect to output port A3 of 3-port optical circulator A. The input light wave is input from the input port A1 of the 3-port optical circulator, reaches the middle port A2, and passes through the SFBG 2 After reflection, the reflected wave passes through the symmetrical Bragg grating SFBG 2 Then output from the output port A3. For the second connection, see image 3 (b), 0 to π sampled Bragg grating SFBG 1 Connected to the middle port A2 of the 3-port optical circulator A, symme...

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

A super-narrow double channel filter based on symmetric-sampling grating structure consists of two SFBG and one optical circulator with three ports. It is featured as applying O to pi cycle to carry out sampling by one Bragg grating and applying symmetric-space sampling by another Bragg grating, generating two suppression frequency bands on spectral line by the former and generating two through frequency bands by the latter.

Description

technical field [0001] The invention relates to an optical filter, in particular to an ultra-narrow dual-channel optical filter. Background technique [0002] Fiber Bragg gratings (FBG) have been used in many fiber optic devices, such as optical filters, optical sensors and so on. At the same time, FBG has the ability to generate multiple channels. But the traditional sampling fiber Bragg grating (SFBG) is performed with simple binary sampling, which realizes multiple channels with different lengths and bandwidths. Although the complex sinC sampling function technology can overcome these problems and realize the same multi-channel Bragg grating filter, the bandwidth of each channel is very large, usually 100pm-300pm. At the same time, a spatial π phase shift is introduced at the center of the uniform fiber grating, and the suppression frequency band of the grating can obtain an ultra-narrow transmission window, but only a single-channel response can be obtained. Contents...

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
Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/18G02B6/26G02B6/34
Inventor 刘雪明宫永康王雷然王涛赵卫
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI