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Preparation device and preparation method of chalcogenide glass fiber Bragg grating

A technology of fiber Bragg and chalcogenide glass, which is applied in the direction of cladding optical fiber, optical waveguide, light guide, etc., and can solve the problems of high dependence on phase mask and limited length of fiber Bragg grating center wavelength grating

Active Publication Date: 2020-03-13
XUZHOU NORMAL UNIVERSITY
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Problems solved by technology

[0007] In order to solve the problem that the existing chalcogenide glass fiber fiber Bragg grating writing device can only be used for writing sulfide glass fiber and some selenide glass fibers, and it is highly dependent on the phase mask, so that the center wavelength of the written fiber Bragg grating and The length of the grating is severely limited, etc. The present invention provides a preparation device and method for a chalcogenide glass fiber Bragg grating

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  • Preparation device and preparation method of chalcogenide glass fiber Bragg grating
  • Preparation device and preparation method of chalcogenide glass fiber Bragg grating
  • Preparation device and preparation method of chalcogenide glass fiber Bragg grating

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preparation example Construction

[0038] The present invention also provides a method for preparing a chalcogenide glass fiber Bragg grating based on the above device, comprising the following steps:

[0039] S1. According to the bandgap wavelength band of the host material of the chalcogenide glass optical fiber 6 used, select the corresponding wavelength tunable femtosecond laser light source 2 grating writing wavelength, with the help of reflective gold mirror 3, dichroic mirror 4, calcium fluoride Lens one 5, the first three-dimensional adjustment frame 7 make the femtosecond laser focus in the core of the chalcogenide glass optical fiber 6;

[0040] S2. According to the grating writing wavelength, switch to the visible light-near-infrared silicon-based camera 9 with a working band of 0.4-1 μm or the near-infrared-mid-infrared extended InGaAs camera 10 with a working band of 1-2.4 μm or a working band of 2.5 through the mechanical turntable 13 The mid-infrared mercury cadmium telluride camera 11 of -10 μm ...

Embodiment 1

[0043] Embodiment 1: Chalcogenide glass fiber 6 uses sulfide glass single-mode fiber (core: As 0.40 S 0.60 , cladding: As 0.39 S 0.61 ), the fiber diameter is 160 μm, and the core diameter is 4 μm; its bandgap wavelength is located at ~0.52 μm (such as image 3 shown). Firstly, the optical fiber is fixed on the nano-precision three-dimensional mechanical mobile platform 1, the femtosecond laser wavelength is selected as 0.8 μm, the pulse repetition frequency is 1 kHz, the pulse width is 120 femtoseconds, and the single pulse energy is 5 nanojoules. Switch to the visible light-near-infrared silicon-based camera 9 with a working wavelength of 0.4-1.1 μm through the mechanical turntable 13, and use the auxiliary imaging system on the side of the fiber to realize the accuracy of the focus position (including the centrality and the upper and lower positions) of the femtosecond laser spot in the fiber core Position and make the X-moving direction of the nanometer-precision three...

Embodiment 2

[0044] Embodiment 2: Chalcogenide glass fiber 6 uses selenide glass single-mode fiber (core: Ge 0.1 As 0.3 Se 0.6 , cladding: Ge 0.13 As 0.2 S 0.67 ), the fiber diameter is 240 μm, and the core diameter is 6.5 μm. Its bandgap wavelength is located at 0.8μm (such as image 3 shown). Firstly, the optical fiber is fixed on the nano-precision three-dimensional mechanical mobile platform 1, the femtosecond laser wavelength is selected as 1.5 μm, the pulse repetition frequency is 100 kHz, the pulse width is 100 femtosecond, and the single pulse energy is 0.1 nanojoule. Switch to the near-infrared-mid-infrared extended InGaAs camera 10 with a working band of 1-2.4 μm through the mechanical turntable 13, and realize the focus position (including centrality and up-down position) of the femtosecond laser spot in the fiber core by means of the fiber side auxiliary imaging system ), and make the X-moving direction of the nanometer-precision three-dimensional mechanical mobile platf...

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Abstract

The invention discloses a preparation device and a preparation method of a chalcogenide glass fiber Bragg grating. The preparation device comprises a femtosecond laser fiber Bragg grating direct writing system, an optical fiber side imaging system, a mechanical turntable, a spectrum testing system and a control system. Firstly, femtosecond laser used for inscribing is accurately focused and positioned at the position of an optical fiber core through the optical fiber side imaging system; the femtosecond laser fiber Bragg grating direct writing system accurately controls the moving speed of a chalcogenide optical fiber through a three-dimensional mechanical moving platform to achieve grating inscribing in the optical fiber by femtosecond laser pulses; the optical fiber side imaging camera is switched through the mechanical turntable to adapt to the use of femtosecond lasers with different working wavelengths; the spectral characteristics of an inscribed fiber Bragg grating are tested through the spectrum testing system; and the parameters of the systems are controlled through a computer. The device is high in universality. Fiber Bragg gratings with different central wavelengths canbe inscribed on chalcogenide glass optical fibers with different components. The systems are easy to operate, low in preparation cost and high in efficiency.

Description

technical field [0001] The invention relates to the technical field of fiber Bragg grating preparation, in particular to a preparation device and method of a chalcogenide glass fiber Bragg grating. Background technique [0002] With the development of long-distance optical fiber communication technology, optical fiber technology constitutes an important pillar technology in the field of optical communication. In the past 30 years, all kinds of optical fiber devices have been developed rapidly. The main advantages of optical fiber devices are: (1) the device is compact in structure, small in size and light in weight; (2) it can be mass-produced, and the device cost per unit length is low; (3) since the optical fiber itself is a single transverse mode optical waveguide, its output beam high quality. Fiber Bragg grating, as a special fiber optic device, can theoretically realize the band-pass (that is, light transmission) or band-stop (that is, reflection) function with tunab...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02123
Inventor 冯宪杨志勇施进丹
Owner XUZHOU NORMAL UNIVERSITY
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