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

Ring-assisted few-mode fiber for uncoupled mode-division multiplexing transmission and its transmission method

A technology of few-mode fiber and mode division multiplexing, which is applied in the direction of graded-index fiber core/cladding fiber, cladding fiber, optics, etc., and can solve the problem of difficult to effectively suppress LP21 and LP02 mode coupling, inapplicability, and effective refraction Reduce the difficulty of preparation, improve the mode extinction ratio, and improve the effective refractive index difference

Active Publication Date: 2021-12-24
上海光织科技有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology can only obtain more than 0.9×10 in two-mode fibers supporting LP01 and LP11 modes -3 The effective refractive index difference, and in the described fiber supporting four LP modes, the technology can realize the effective refractive index difference of less than 0.5×10 -3 , it is difficult to effectively suppress the coupling between LP21 and LP02 modes, so this technical solution is not suitable for weakly coupled few-mode fibers supporting 4 or more LP modes

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
  • Ring-assisted few-mode fiber for uncoupled mode-division multiplexing transmission and its transmission method
  • Ring-assisted few-mode fiber for uncoupled mode-division multiplexing transmission and its transmission method
  • Ring-assisted few-mode fiber for uncoupled mode-division multiplexing transmission and its transmission method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this embodiment, a loop-assisted weakly coupled four-mode fiber is designed and optimized. To ensure four-mode operation and the highest order guided mode (LP 02 mode) capable of low-loss transmission, first study the possible core size and refractive index combination of the step-index fiber in the case of V = 5.1, and study their effective refractive index difference between modes at 1550nm and the mode field area with the fiber Variation of parameters. Such as figure 1 As shown in , while keeping the V value constant, as the core size increases, the effective refractive index difference of each mode decreases gradually, and the minimum mode field area of ​​each mode increases significantly. Therefore, for the conventional step structure For few-mode fibers, there is an obvious mutual constraint relationship between the mode effective refractive index difference and the mode field area, and the limiting bottleneck is mainly LP 21 with LP 02 There is a small dif...

Embodiment 2

[0039] In this embodiment, a ring-assisted weakly coupled seven-mode fiber with grooves is designed. Fiber structure such as Image 6 As shown in (a), the area indicated by the horizontal line is the core 1, the area indicated by the vertical line is the high refractive index ring 2 in the core, and the area indicated by the dot is the groove structure 4, which is used to compensate the bending loss. Such as Image 6 As shown in (b), it is a schematic diagram of the refractive index distribution of the fiber section. It can be seen from the figure that the core diameter is 2R, the relative refractive index difference between the core and the cladding is Δn, and the inner circle diameter of the high refractive index ring in the fiber core is 2R in_ring , the radial width of the ring is W ring , the relative refractive index difference between ring and core is Δn + , a low-refractive-index groove is set between the core and the cladding, and the radial width of the groove is ...

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
areaaaaaaaaaaa
radiusaaaaaaaaaa
radiusaaaaaaaaaa
Login to View More

Abstract

A ring-assisted few-mode fiber for uncoupled mode-division multiplexing transmission and its transmission method, including: a core and a cladding structure, and a high-refractive-index ring is arranged in the fiber core, and the high-refractive-index ring is placed in the optical fiber LP at position in 02 The electric field intensity of mode is (0,30%] place of peak intensity, and described fiber core except high refractive index ring other parts refractive index is identical. The present invention has effectively reduced the mode coupling in the transmission process. Through this technology , the minimum effective refractive index difference between modes can be more than doubled under the condition that the mode field area is basically unchanged, so as to obtain an uncoupled few-mode fiber with large mode field area and low mode crosstalk. Multiplexing transmission has great significance and application prospects.

Description

technical field [0001] The invention relates to a technology in the field of optical fiber communication, in particular to a weakly coupled few-mode optical fiber used for mode division multiplexing optical transmission and a transmission method thereof. Background technique [0002] In recent years, the demand for data transmission has continued to maintain an annual growth rate of about 40%, which puts forward higher requirements for the capacity of optical fiber communication systems. By adopting advanced multiplexing methods such as high-power Raman amplification and dense wavelength division multiplexing, as well as coherent detection and DSP digital processing technology, the transmission capacity of ordinary single-mode optical fiber networks has been greatly improved, which is close to its theoretical upper limit of 100Tb / s. Therefore, in order to further improve the transmission capacity of a single fiber, the mode division multiplexing technology based on few-mod...

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): G02B6/028
CPCG02B6/0288
Inventor 何祖源马麟姜寿林樊昕昱杜江兵张文甲徐晓李佳熊
Owner 上海光织科技有限公司
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