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Middle-infrared-band dispersion compensator

A dispersion compensation, infrared band technology, applied in optical waveguides, microstructured fibers, cladding fibers, etc., can solve the problems of difficult to increase power and low transmission loss of lasers

Inactive Publication Date: 2015-07-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the disadvantage that the existing mid-infrared band mode-locked fiber laser is difficult to increase the power, and utilizes ZBLAN fluoride glass fiber having low transmission loss and large normal group velocity dispersion characteristics in the mid-infrared band, and designs a mid-infrared laser based on ZBLAN micro-nano fiber Infrared Broadband Dispersion Compensation Device and Structural Parameter Optimization

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Embodiment 1

[0018] The first embodiment of the invention consists of an optical fiber core part (1), a cladding part (2), a section of input optical fiber (3) and a section of output optical fiber (4). Wherein, the core part (1) is ZBLAN, the cladding part (2) is air, and the core diameter is 1.5 microns. The dispersion curve of the mid-infrared optical fiber dispersion compensation device is as follows figure 2 shown. The group velocity dispersion parameter (GVD) of the optical fiber dispersion compensator reaches 4457ps at a wavelength of 3 microns 2 / km, its value reaches a peak of 6403ps at a wavelength of 3.7 microns 2 / km, up to 6067ps at 4 micron wavelength 2 / km.

Embodiment 2

[0020] image 3 is the waveguide dispersion curve of the second embodiment of the present invention. The core part (1) of the dispersion compensator is ZBLAN, and the cladding part (2) is MgF 2 , with a core diameter of 3 microns, MgF 2 The thickness is 5 nm, and the outer cladding is air. The GVD parameter of the optical fiber dispersion compensator reaches 344.9ps at a wavelength of 3 microns 2 / km, reaching a peak value of 674ps near a wavelength of 4 microns 2 / km.

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Abstract

The invention discloses a middle-infrared-band dispersion compensator which is implemented on the basis of fluoride ZBLAN micronano optical fibers. The middle-infrared-band dispersion compensator comprises an input optical fiber, a ZBLAN micronano optical fiber and an output optical fiber. By reasonable design of parameters including geometric structure, numerical aperture and the like of the micronano optical fiber, high normal dispersion of the ZBLAN micronano optical fiber in a wavelength ranging from 2 micrometers to 5 micrometers can be achieved to effectively compensate dispersion of optical fiber links. In addition, nonlinear parameters of the micronano optical fiber can be regulated according to optical fiber structural parameters. Owing to unique dispersion characteristics and low loss of the ZBLAN micronano optical fiber, a simple scheme is provided for dispersion compensation of middle-infrared-band ultrafast lasers.

Description

technical field [0001] The present invention relates to a mid-infrared band optical fiber device, in particular to a mid-infrared broadband dispersion compensation device based on ZBLAN micro-nano optical fiber, which is used to realize a laser all-fiber structure, optimize the output power of a mode-locked fiber laser, soliton pulse transmission and broadband supercontinuum spectrum generation etc. Background technique [0002] In recent years, the rise of mode-locked fiber lasers in the mid-infrared band (2-5 μm) has aroused great interest. In this wavelength range, many important molecules have strong rotational vibration absorption, which provides the possibility for mid-infrared atmospheric detection and so on. In addition, the high-power pulsed laser in this band is an ideal light source for applications such as plastic processing and molding, and is also used in the field of strong field physics. However, limited by the traditional soliton area theory and spectral s...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02295
Inventor 杨青林缪丽丽唐平华赵楚军
Owner HUNAN UNIV
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