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A dispersion-optimized bend-insensitive optical fiber

A bend-insensitive, optical fiber technology, applied in clad optical fibers, multi-layer core/clad optical fibers, optics, etc., can solve problems such as difficulty in meeting the requirements of bending loss, avoid excessive bending loss, and optimize the dispersion coefficient. Effect

Active Publication Date: 2021-12-31
YANGTZE OPTICAL FIBRE & CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Bend-insensitive optical fibers generally have a depressed cladding, and optimized bend-insensitive single-mode optical fiber patent documents CN110780379B, CN110749953A, CN103257397B, and CN102200610B use a depressed cladding while also setting a raised cladding. However, from the example data, it is difficult to meet the bending loss requirements of G.657.A2 and G.657.B3 under small bending radii for the design of such a dispersion-optimized single-mode fiber convex cladding

Method used

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  • A dispersion-optimized bend-insensitive optical fiber
  • A dispersion-optimized bend-insensitive optical fiber
  • A dispersion-optimized bend-insensitive optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1~10

[0055] Embodiment 1-1~10 G657A2 standard optical fiber

[0056] The geometric dimensions and refractive index parameters adopted by the G657A2 standard optical fiber are shown in the table below;

[0057]

[0058]

[0059] The relative refractive index difference change curve of the transitional depressed cladding can be expressed as:

[0060]

[0061] in is the distance from a point in the transitional depressed cladding to the boundary of the core cladding, is the distribution index, is the refractive index of the core layer relative to pure silica, that is, its relative refractive index difference, is the refractive index of the depressed cladding relative to pure silica, that is, its relative refractive index difference, is the transitional sag cladding width.

[0062] After testing, the attenuation of the G657A2 standard optical fiber provided in Examples 1-1~10 at a wavelength of 1310nm is less than or equal to 0.330dB / km; the attenuation at a waveleng...

Embodiment 2-1~10

[0072] Embodiment 2-1~10 G657B3 standard optical fiber

[0073] The geometric dimensions and refractive index parameters adopted by the G657B3 standard optical fiber are shown in the table below;

[0074]

[0075]

[0076] The refractive index variation curve of the transitional depressed cladding can be expressed as:

[0077]

[0078] in is the distance from a point in the transitional depressed cladding to the boundary of the core cladding, is the distribution index, is the refractive index of the core layer relative to pure silica, is the refractive index of the depressed cladding relative to pure silica, is the transitional sag cladding width.

[0079] After testing, the attenuation of the G657B3 standard optical fiber provided in Examples 2-1~10 at a wavelength of 1310nm is less than or equal to 0.330dB / km; the attenuation at a wavelength of 1383nm is less than or equal to 0.284 dB / km; Less than or equal to 0.190dB / km; attenuation at a wavelength of 16...

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Abstract

The invention discloses a dispersion-optimized bend-insensitive optical fiber, which is provided with a transitional sunken cladding between the core layer and the sunken cladding, and the relative refractive index difference of the transitional sunken cladding is continuous from the inside to the outside from 0%. Changes to the relative refractive index difference at the junction point of the depressed cladding. The present invention adopts double sunken cladding to balance and optimize waveguide dispersion and macrobending performance, and reduce its dispersion coefficient without affecting the bending performance of the optical fiber; wherein the transitional sunken cladding between the core layer and the sunken cladding, its The refractive index changes continuously to reduce the waveguide dispersion caused by the difference in refractive index between the core layer and the cladding layer in the waveguide structure, limit the refractive index distribution and width of the transitional depressed cladding layer, optimize the dispersion coefficient, and avoid the problem caused by the convex cladding layer. The problem of excessive bending loss at small bending radii.

Description

technical field [0001] The invention belongs to the field of optical fiber communication, and more specifically relates to a dispersion-optimized bend-insensitive optical fiber. Background technique [0002] Dispersion is an important transmission characteristic of optical fiber. Dispersion is a physical effect in which different frequency or mode components in light waves travel at different speeds and produce different time delays. With the continuous increase of the optical fiber transmission distance, the broadening of the optical pulse caused by dispersion causes the front and rear pulses to overlap each other, causing inter-symbol crosstalk of digital signals, resulting in an increase in the bit error rate. There are mainly two kinds of dispersion in single-mode optical fiber: material dispersion and waveguide dispersion. Material dispersion is the dispersion characteristic caused by the signal pulse broadening caused by the group refractive index of the material chan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/036
CPCG02B6/03644G02B6/03694
Inventor 雷汉林王瑞春顾立新朱继红刘善沛黄利伟曹蓓蓓吴俊
Owner YANGTZE OPTICAL FIBRE & CABLE CO LTD
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