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Single mode and multi-mode cladding mode interference special type optical fibre and method for making same

A special optical fiber, cladding mode technology, applied in the direction of multi-layer core/cladding optical fiber, cladding optical fiber, glass manufacturing equipment, etc., can solve the problems of performance degradation, complex preparation process, etc. Mature preparation process and low cost effect

Inactive Publication Date: 2010-09-22
SHANGHAI UNIV
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Problems solved by technology

[0004] However, the cladding interference based on the fiber grating structure requires secondary processing of the fiber, and there will be problems in its reliability and consistency, especially the problem of performance degradation at high temperature and long-term use; based on photonic crystals The cladding mode interference realized by optical fiber is mainly imported in my country because of its complicated preparation process, especially the mode distribution and the coupling problem with conventional single-mode optical fiber are also problems to be solved, so this requires a new type of optical fiber waveguide and its device appears

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  • Single mode and multi-mode cladding mode interference special type optical fibre and method for making same
  • Single mode and multi-mode cladding mode interference special type optical fibre and method for making same

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Embodiment 1

[0017] Embodiment one: see figure 1 , a single-mode and multi-mode cladding mode interference special optical fiber of the present invention consists of three parts: core 1, interference inner cladding 2 and outer cladding 3, the material of core 1 is pure silica doped with high refractive index GeO 2 Composition of materials; the material of the interference inner cladding 2 is composed of pure silica doped with low refractive index additive fluorine (F), the doping amount of fluorine is 350ppm, for a 125μm single-mode optical fiber, the thickness of the inner cladding is 8μm; the outer cladding The material of layer 3 is composed of pure quartz, and the interference inner cladding 2 is sandwiched between the core 1 and the outer cladding 3 .

[0018] The above-mentioned single-mode and multi-mode cladding mode interference special optical fibers use the improved chemical vapor deposition method MCVD, and the pure quartz outer cladding (3), interference The inner cladding (...

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Abstract

The invention provides a single-mode / multi-mode cladding mode interference special fiber and a method for preparing the same. The fiber comprises a fiber core, an inner interference cladding and an outer cladding; the inner interference cladding is arranged between the fiber core and the outer cladding, and has a refractive index lower than the fiber core and the outer cladding. The preparation method of the single-mode / multi-mode cladding mode interference special fiber is to make a fiber preform on a rod making machine directly by adopting improved chemical vapor deposition (MCVD) and outside vapor deposition (OVD) and then drawing the fiber. The single-mode / multi-mode cladding mode interference special fiber of the invention is characterized by being stable in performance, simple in preparation, flexible to use and convenient for batch production and can be applied in fiber spectral filter, dispersion compensator, fiber pressure sensor and fiber temperature sensor in the fields such as fiber communication device and fiber sensor.

Description

technical field [0001] The invention relates to a single-mode and multi-mode cladding mode interference special optical fiber, which belongs to the technical field of optical fiber. Background technique [0002] Cladding mode interference is to use some special optical waveguide structure to couple the optical energy transmitted in the fiber core to the fiber cladding waveguide for transmission. The coupling structure parameters determine the phase matching conditions of different order core modes and cladding modes. Thus, cladding mode interference is realized [T. Erdogan. Journal of the Optical Society of America A, 1997, 14(8): 1760-1773]. The cladding mode interference characteristics can solve many key technical problems in the field of optical fiber communication and optical fiber sensing: first, the spectral filtering function - based on the cladding mode interference characteristics, it is possible to obtain optical fiber spectral filters with excellent performance, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036C03B37/018
CPCC03B37/01807C03B2201/12C03B2201/31C03B2203/23C03B37/01413C03B2201/10
Inventor 王廷云庞拂飞陈振宜向文超梁文斌
Owner SHANGHAI UNIV
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