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Pohotonic crystal fiber and common single-mode fiber low-loss coupling method

A technology of photonic crystal fiber and ordinary single-mode fiber, which is applied in the coupling of optical waveguide, cladding fiber, optical waveguide and light guide, etc., can solve the problems of large loss and achieve good versatility, high coupling efficiency and good coupling effect Effect

Inactive Publication Date: 2015-06-10
HEFEI UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a low-loss coupling method between a photonic crystal fiber and a common single-mode fiber, so as to solve the problem of large loss after coupling between a photonic crystal fiber and a common single-mode fiber in the prior art

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  • Pohotonic crystal fiber and common single-mode fiber low-loss coupling method

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[0024] This example selects PCF such as figure 1 As shown in c, its parameters are: cladding diameter D is 125 μm, air hole diameter d is 1.8 μm, distance A between air holes is 2.5 μm, and mode field diameter MFD is 2.4 μm. The single-mode fiber is SMF-28, and the mode field diameter is 10.4 μm. Due to the large difference in the mode field diameters of the two fibers, the coupling loss of the two fibers is relatively large. If only the loss caused by mode field mismatch is considered, the theoretical value of the coupling loss of the two fibers is 7.17dB. The coupling loss α caused by mode field mismatch is calculated as follows, where ω PCF and ω SMF Represent the mode field diameters of PCF and SMF respectively:

[0025] α = - 10 lg [ ( 2 ω PCF ω ...

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Abstract

The invention discloses a pohotonic crystal fiber and common single-mode fiber low-loss coupling method. The method comprises the steps of determining filling schemes, and filling air holes of pohotonic crystal fibers selectively; selecting appropriate filling parameters and filing the pohotonic crystal fiber; coupling the common single-mode fiber and the filled pohotonic crystal fiber. The method is applicable to low-loss coupling between various pohotonic crystal fibers and common single-mode fibers, and the advance of the method is apparent in the condition of serious mismatch of mode fields of the pohotonic crystal fibers and the common single-mode fibers.

Description

technical field [0001] The invention relates to the field of optical fiber coupling methods, in particular to a low-loss coupling method between a photonic crystal optical fiber and a common single-mode optical fiber. Background technique [0002] Photonic Crystal Fiber (PCF, Photonic Crystal Fiber), also known as holey fiber (HF) or microstructured fiber (MOF), has a periodically arranged air hole structure and a flexible structure. Compared with traditional optical fibers, it has the advantages of adjustable dispersion, adjustable nonlinear characteristics, and can realize endless single-mode characteristics. It can be used in supercontinuum generation, optical soliton communication and other fields, and has become a research hotspot. The low-loss fusion splicing technology of photonic crystal fiber and ordinary single-mode fiber is a key technical issue for the practical application of photonic crystal fiber. Therefore, how to achieve low-loss fusion splicing between pho...

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Application Information

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IPC IPC(8): G02B6/24G02B6/02
CPCG02B6/24G02B6/02328
Inventor 姜海明张静谢康王二垒
Owner HEFEI UNIV OF TECH
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