Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A cascaded long-period fiber grating mode filter

A fiber grating and long-period technology, applied in the direction of grating fiber, cladding fiber, optical waveguide light guide, etc., can solve the problem of no mode filter, etc., and achieve the effect of reducing crosstalk, increasing working bandwidth, and improving purity

Inactive Publication Date: 2018-06-26
JIANGSU UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no suitable filter

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
  • A cascaded long-period fiber grating mode filter
  • A cascaded long-period fiber grating mode filter
  • A cascaded long-period fiber grating mode filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] Such as figure 1 As shown, the cladding 2 material of the few-mode fiber is pure silica, the refractive index difference between the core 1 and the cladding 2 is 0.01, the refractive index of the coating layer is 0.005 higher than that of the cladding 2, the diameter of the core 1 is 10 μm, and the cladding 2 The diameter is 125 μm, write three segments of apodized long-period fiber gratings in the core 1, the grating part removes the coating layer, the first segment corresponds to the grating with a center wavelength of 1.54 μm, Λ 1 198.7 μm, L 1 is 17.49mm; the second section corresponds to a grating with a center wavelength of 1.55μm, Λ 2 200μm, L 2 is 18mm; the third section corresponds to the grating with a center wavelength of 1.56μm, Λ 3 201.7 μm, L 3 It is 18.15mm. The optical fiber with a length of 30mm is kept between the gratings and its coating layer is retained. The few-mode optical fiber written with the long-period fiber grating is immersed in a smal...

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

PropertyMeasurementUnit
lengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a cascade type long-time cycle fiber grating filter ejector, wherein the filter ejector is a segment of few-mode fiber based on multi-cascade long-time cycle fiber grating; write in multi-segment long-time cycle fiber grating in a fiber core; the few-mode fiber comprises the fiber core and a cladding; the outside of the fiber is made of a low-index material; the coating of the few-mode fiber is made of a high-index material. The low-index material is a kind of material that has a refractive index lower than the cladding; each segment of long-time cycle fiber grating satisfies the phase match condition between a fiber-based mode (LP01) and a cladding mode coupling under different wavelength. The long-time cycle fiber grating structure makes the fiber-based mode and the cladding mode couple, and other high order modes have no coupling or the energy can be transferred back after coupling, thereby realizing the purpose of filtering the fundamental mode and reserving the high order modes. According to the invention, work band width can be effectively increased; a mode reuse system using few-mode fiber communication can be used to improve mode purity and reduce mode crosstalk.

Description

technical field [0001] The invention relates to the field of few-mode optical fiber communication, and is used in a mode multiplexing system and device of few-mode optical fiber communication to improve the purity of modes and reduce the crosstalk between modes. Background technique [0002] With the development of the network business, people's demand for optical fiber communication capacity is increasing. An effective way to increase long-distance communication capacity is to use wavelength division multiplexing technology. The wavelength division multiplexing system can realize the simultaneous transmission of multiple light waves with different wavelengths and different information in one optical fiber, thereby increasing the ease of communication. In order to separate these light waves and suppress the interference of other wavelengths of light, filters are required for filtering. The purpose of the filter is to ensure the passage of signals in the required wavelength...

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): G02B6/02
CPCG02B6/02085G02B6/02095G02B6/021
Inventor 陈明阳韦锦
Owner JIANGSU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com