A large effective area and low loss single-mode optical fiber

A single-mode fiber, effective area technology, applied in the field of optical communication, can solve the problems of complex doping process, poor fiber strength, difficult concentration control, etc., and achieve the effects of increasing the mode field diameter, reducing stress mutation, and reducing attenuation.

Active Publication Date: 2021-12-14
ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, in order to further reduce or completely eliminate the amount of Ge doped in the core layer, while reducing the viscosity difference between the core layer and the fluorine-doped layer, a trace amount of alkali metal (usually K 2 O) has been extensively studied, and trace amounts of K 2 Although O can significantly reduce the viscosity of quartz glass, and through the K 2 O gasification and diffusion can eliminate structural defects in quartz glass, which is beneficial to reduce Rayleigh scattering, but due to K 2 O is prone to moisture absorption and instability. If the concentration is too high, it will lead to the rapid deterioration of the optical fiber's anti-hydrogen damage and anti-radiation performance.
And because KCl is very easy to hydrolyze, even a small amount of KCl crystals in the fiber material will make the fiber strength worse
In order to prevent the formation of KCl, doped with K 2 O process requires that the chlorine content of all raw materials must be less than 50PPm, so K 2 The O doping process is very complicated, and the concentration control is difficult, making it difficult to achieve large-scale and repeatable production

Method used

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  • A large effective area and low loss single-mode optical fiber
  • A large effective area and low loss single-mode optical fiber
  • A large effective area and low loss single-mode optical fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] The prefabricated inner core rod is prepared by the improved in-tube chemical vapor deposition method MCVD process, and the inner core rod includes: core layer, gradient layer 1, inner cladding layer 1, inner cladding layer 2, gradient layer 2, depression layer, transition layer (the transition layer is doped with F composed of quartz tubes). Use F-doped quartz tube as the deposition substrate tube, SiCl 4 and O 2 for SiO 2 Raw material, SiF 4 , SF 6 、C 2 f 6 or CF 4As a raw material for fluorine doping, GECl 4 As a GE-doped raw material, POCl 3 It is a raw material doped with P; using a hydrogen-oxygen torch moving back and forth as a heat source, by controlling the concentration of each doping element in the tube, the concave layer is sequentially deposited on the inner surface of the substrate tube, and the gradient layer 2, the inner cladding layer 2, the inner cladding layer 1, and the gradient layer 1 and the core layer; then melt the deposition tube to a...

Embodiment 2

[0092] The preparation method is the same as that in Example 1. The improved in-tube chemical vapor deposition method MCVD production process is used to prepare a preform, draw wire, and match the outer tube to obtain an optical fiber. The optical fiber structure includes a core layer, a graded layer 1, an inner cladding layer 1, an inner cladding layer 2, a graded layer 2, a concave layer, a transition layer and an outer cladding layer from the inside to the outside, and the content of doping elements in each layer is shown in Table 1; The layer thicknesses are shown in Table 2.

[0093] Gradient layer 1: Δ2(r)=0.15-0.17×(r-5.8) 0.8 5.8

[0094] Gradient layer 2:

[0095] The performance of the optical fiber obtained in Example 2 was tested, and the results obtained are shown in Table 3.

[0096] As can be seen from Table 2 and Table 3, on the basis of Example 1, the core layer refractive index Δ1 is reduced from 0.20% to 0.15% in Example 2 (the amount of Ge dopin...

Embodiment 3

[0098] The preparation method is the same as that in Example 1. The improved in-tube chemical vapor deposition method MCVD production process is used to prepare a preform, draw wire, and match the outer tube to obtain an optical fiber. The optical fiber structure includes a core layer, a graded layer 1, an inner cladding layer 1, an inner cladding layer 2, a graded layer 2, a concave layer, a transition layer and an outer cladding layer from the inside to the outside, and the content of doping elements in each layer is shown in Table 1; The layer thicknesses are shown in Table 2.

[0099] Gradient Layer 1:

[0100] Gradient layer 2:

[0101] The performance of the optical fiber obtained in Example 3 was tested, and the results obtained are shown in Table 3.

[0102] It can be seen from Table 2 and Table 3 that the core refractive index Δ1 of Example 3 is reduced to 0.12% on the basis of Example 1, the core radius R1 is 6.3 μm, and other structural parameters are basicall...

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Abstract

The present invention provides a large effective area low-loss single-mode optical fiber, which is characterized in that, from the center to the periphery, it includes: a core layer, a first graded layer, a first inner cladding layer, a second inner cladding layer, a second graded layer, and a depression layer, transition layer and outer cladding. Compared with the prior art, the present invention designs a double gradient layer and a double inner cladding between the core layer and the concave layer, which can reduce the stress mutation between the core layer and the concave layer on the one hand and reduce attenuation; on the other hand, it can eliminate the depression The effect of layers on the key properties of optical fibers, especially the mode field diameter and the cut-off wavelength of the optical cable, increases the mode field diameter of the optical fiber, and provides a new design method for large effective area and low loss single-mode optical fiber.

Description

technical field [0001] The invention belongs to the technical field of optical communication, in particular to a single-mode optical fiber with large effective area and low loss. Background technique [0002] The optical fiber communication network is constantly developing towards the "three super" directions of ultra-long distance, ultra-large capacity, and ultra-high speed. In recent years, 400Gbs high-speed optical fiber communication technology has gradually matured and started to enter the practical field. The 400Gbs transmission technology can not only increase the network bandwidth, but also greatly reduce the transmission cost per bit through high-order modulation technology. Transmission systems at 100Gbs and above utilize high-order modulation schemes and coherent digital detection. In this system, dispersion and PMD can be digitally compensated in the electrical domain, but these systems are limited by fiber nonlinearity and fiber loss. The mainstream 400Gbs te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B6/028G02B6/036
CPCG02B6/02019G02B6/028G02B6/0283G02B6/036G02B6/03688
Inventor 蒋新力王见青沈一春许维维徐希凯丁松唐江
Owner ZHONGTIAN TECH ADVANCED MATERIALS CO LTD
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