Cascade type long-time cycle fiber grating filter ejector

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 reducing loss

Inactive Publication Date: 2015-11-04
JIANGSU UNIV
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  • Cascade type long-time cycle fiber grating filter ejector
  • Cascade type long-time cycle fiber grating filter ejector
  • Cascade type long-time cycle fiber grating filter ejector

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[0045] like 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 small b...

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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...

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02085G02B6/02095G02B6/021
Inventor 陈明阳韦锦
Owner JIANGSU UNIV
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