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Large-effective-area single mode optical fiber amplifier based on change of refractive index distribution of cladding

A technology of cladding refractive index and effective area, which is applied in the field of single-mode fiber amplifier with large effective area, can solve the problem that the single-mode and high power of fiber amplifier cannot be combined, and achieve the reduction of maximum power per unit volume and reduction of normalization The effect of optimizing the frequency and reducing the loss

Inactive Publication Date: 2012-05-23
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that existing optical fiber amplifiers cannot have both single-mode and high power, the present invention provides a large effective area single-mode optical fiber amplifier by changing the cladding refractive index distribution

Method used

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  • Large-effective-area single mode optical fiber amplifier based on change of refractive index distribution of cladding
  • Large-effective-area single mode optical fiber amplifier based on change of refractive index distribution of cladding
  • Large-effective-area single mode optical fiber amplifier based on change of refractive index distribution of cladding

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Embodiment approach 1

[0026] Large effective area single-mode fiber amplifiers by changing the cladding refractive index distribution, such as figure 1 , 2 shown. The amplifier includes: an optical fiber and a pump source 3 .

[0027] The refractive index of the core 1 of the optical fiber is 1.6, and the refractive index of the cladding 2 is 1.4.

[0028] The annular region with an axial length of 1 mm is etched away with a hydrofluoric acid solution, the thickness of the ring is 50 μm, and it is filled with quartz having a refractive index of 1.5 to form a filled region 4 .

[0029] The radius of the core 1 is 8 microns, the thickness of the cladding 2 is 50 microns, and the axial length of the filling region 4 is 1 mm.

[0030] The pumping source 3 pumps the fiber end face.

Embodiment approach 2

[0032] A large effective area single-mode fiber amplifier with a D-shaped filling area by changing the refractive index distribution of the cladding, such as image 3 , 4 shown. The amplifier includes: an optical fiber and a pump source 3 .

[0033] The refractive index of the core 1 of the optical fiber is 1.9, and the refractive index of the cladding 2 is 1.7.

[0034] The shape is etched away with hydrofluoric acid solution to form a D shape with a chord height of 10 microns and an axial length of 10 mm, and is filled with quartz having a refractive index of 1.8 to form a filled region 4 .

[0035] The radius of the core 1 is 100 microns, and the thickness of the cladding 2 is 100 microns.

[0036] The pumping source 3 pumps the side of the optical fiber.

Embodiment approach 3

[0038] A large effective area single-mode fiber amplifier with a helical rectangular groove whose filling area changes the refractive index distribution of the cladding, such as Figure 5 shown. The amplifier includes: an optical fiber and a pump source 3 .

[0039] The refractive index of the core 1 of the optical fiber is 1.8, and the refractive index of the cladding 2 is 1.6.

[0040] The filling area 4 is etched away with a hydrofluoric acid solution to form a spiral rectangular groove with a width of 10 microns, a pitch of 100 microns, and a depth equal to the thickness of the cladding layer 2. The filling area 4 is formed by filling with quartz having a refractive index of 1.7.

[0041] The radius of the core 1 is 50 microns, and the thickness of the cladding 2 is 80 microns.

[0042] The pumping source 3 pumps the fiber end face.

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Abstract

The invention discloses a large-effective-area single mode optical fiber amplifier based on the change of refractive index distribution of cladding, which is applicable in the field of optical fiber communication. In order to solve the problem that the conventional optical fiber amplifier fails to combine single mold and high power, the laser transmission mode of fiber core is changed by changingthe refractive index distribution of the cladding of the optical fiber in the amplifier, so the signal amplification in a large mold field area is realized under a single mold condition. The concreteprocess comprises the following steps of: corroding and removing the cladding (2) of the optical fiber with solution of hydrofluoric acid and filling with quartz of which the refractive index is bigger than that of the cladding (2) and smaller than that of the fiber core (1) to form a filling area (4), wherein the filling area may be D-shaped, annular, rectangular and spirally coiled. The opticalfiber amplifier is used for high-power amplification of the laser signals in the optical fiber communication.

Description

technical field [0001] The invention relates to a single-mode optical fiber amplifier with large effective area, which is suitable for optical fiber communication. Background technique [0002] The emergence of optical fiber amplifiers enables optical fiber communication to achieve advantages that cannot be achieved by optical-electrical-optical conversion of electrical relay in terms of high power, long distance, and non-electric relay. Optical fiber amplifiers have been widely recognized for their excellent signal amplification and transparency of the optical path. With the development of technology, the magnification of optical fiber amplifiers is increasing. High-magnification optical fiber amplifiers are used in optical fiber communications, national defense and sensing. The application has attracted people's attention day by day, and its wide range of applications has made people invest more and more in optical fiber amplifiers. Although the high magnification of fibe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067
Inventor 温晓东宁提纲裴丽李晶张帆王春灿
Owner BEIJING JIAOTONG UNIV
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