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A kind of multi-clad fiber and multi-core fiber coupler

A multi-core optical fiber, multi-cladding technology, applied in cladding optical fiber, multi-layer core/cladding optical fiber, coupling of optical waveguides, etc. The effect of macrobending loss and simple preparation process

Active Publication Date: 2020-02-14
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of the defects of the prior art, the purpose of the present invention is to solve the technical problems that the existing multi-core optical fiber coupler is affected by the optical fiber used in the preparation process, so that the processing accuracy, processing difficulty, cost and loss are insufficient.

Method used

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  • A kind of multi-clad fiber and multi-core fiber coupler
  • A kind of multi-clad fiber and multi-core fiber coupler
  • A kind of multi-clad fiber and multi-core fiber coupler

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Embodiment

[0050] In a specific embodiment, the present invention prepares multi-clad optical fiber, and the selected parameters are as shown in the table:

[0051] Table 1 Fiber parameters

[0052] Radius (μm) Relative refractive index difference (%) Fiber core 4.8 0.68 Inner cladding 10.4 0.34 sunken inner cladding 15.8 0 Annular cladding 20.7 0.37 Outer cladding 32.5 0 sunken outer cladding 42.3 -0.48 mechanical cladding 62.1 0

[0053] After the multi-clad fiber is prepared based on the above parameters, it is measured by experiments that the multi-clad fiber has a bending radius of 3mm, a macrobending loss of less than 0.2dB / turn at a wavelength of 1310nm, and a macrobending loss of less than 0.5dB / turn at a wavelength of 1550nm .

[0054] Based on the multi-core fiber coupler prepared by tapering the above multi-clad fiber, and based on the prepared multi-core fiber coupler, the fusion splice loss of the multi-core...

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Abstract

The invention discloses a multi-cladding optical fibre and a multi-core optical fibre coupler. The multi-core optical fibre coupler comprises N multi-cladding optical fibres and a bushing; the multi-cladding optical fibre comprises a fibre core and multiple claddings encircling the fibre core; the multiple claddings sequentially comprise an inner cladding, a sunken inner cladding, an annular cladding, an outer cladding, a sunken outer cladding and a mechanical cladding from inside to outside; the multi-core optical fibre coupler is obtained by inserting the N multi-cladding optical fibres intothe bushing, tapering and cutting the bushing at one point in the middle of the bushing and welding a multi-core optical fibre; after the N multi-cladding optical fibres are inserted into the bushingand tapered, the fibre core, the inner cladding, the sunken inner cladding and the annular cladding of each multi-cladding optical fibre of the tapered end form a tapered fibre core; and the outer cladding, the sunken outer cladding and the mechanical cladding form a tapered cladding. According to the multi-core optical fibre coupler provided by the invention, after being tapered, the multi-cladding optical fibre can be in low-loss welding with the multi-core optical fibre, and also can be in low-loss welding with a standard single-mode optical fibre; and furthermore, the macrobend loss is relatively low.

Description

technical field [0001] The present invention relates to the field of optical fiber technology, and more specifically, to a multi-clad optical fiber and a multi-core optical fiber coupler. Background technique [0002] In order to meet the needs of future communication systems, multi-core optical fiber has been paid more and more attention because it can provide a new multiplexing dimension of space, which can greatly increase the capacity of communication systems. The multi-core optical fiber communication system needs to be compatible with the existing single-mode optical fiber communication system, which requires multi-core optical fiber and single-mode optical fiber to achieve low-loss connection. The multi-core optical fiber coupler can act as a bridge between single-mode optical fiber and multi-core optical fiber Therefore, the multi-core optical fiber coupler and the optical fiber for preparing the multi-core optical fiber coupler are extremely important, and it has be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036G02B6/26
CPCG02B6/03688G02B6/26
Inventor 唐明甘霖李兵沈力康逸凡付松年
Owner HUAZHONG UNIV OF SCI & TECH
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