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Split-wave front Mach-Zehnder interferometer and method based on broadband fiber collimator

A fiber collimator and interferometer technology, applied in the field of fiber optic interferometer, can solve the problems of increasing the wavelength interval of spectral sampling, low resolution of interference spectrum, weak sensing ability, etc. Excellent stickiness and high spectral quality

Active Publication Date: 2022-02-11
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large insertion loss, in order to improve the signal-to-noise ratio of the interferometer spectrum, the spectral sampling wavelength interval must be increased, resulting in low resolution of the interferometric spectrum
Although a fiber optic Mach-Zehnder interferometer with very high sensitivity has been designed, the optical power loss of the interferometer exceeds 95%, which is limited by low resolution. When the interferometer is used for refractive index measurement, the sensing ability not strong
Moreover, there are also problems of poor spectral quality and fragile structure

Method used

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  • Split-wave front Mach-Zehnder interferometer and method based on broadband fiber collimator
  • Split-wave front Mach-Zehnder interferometer and method based on broadband fiber collimator
  • Split-wave front Mach-Zehnder interferometer and method based on broadband fiber collimator

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Embodiment 1

[0025] Such as Figure 1-4 As shown, the demultiplexing front Mach-Zehnder interferometer and method based on the broadband fiber collimator of the present invention include the first optical fiber 1, the first fiber collimator 2, and the second fiber collimator arranged in sequence 4 and the second optical fiber 5, wherein the first fiber collimator 2 is connected behind the first fiber 1, the central axis of the first fiber collimator 2 and the second fiber collimator 4 are on a straight line, and the first A transparent film 3 is provided between the fiber collimator 2 and the second fiber collimator 4 , and the second fiber 5 is connected behind the second fiber collimator 4 .

[0026] In order to further illustrate the above-mentioned embodiment, the two light-transmitting surfaces of the transparent film 3 are perpendicular to the central axes of the first fiber collimator 2 and the second fiber collimator 4, and the transparent film 3 partially blocks the first fiber co...

Embodiment 2

[0042] An implementation method of a split-wavefront Mach-Zehnder interferometer and method based on a broadband fiber collimator, comprising the following steps:

[0043] ① The broadband divergent beam emitted by the first optical fiber 1 is incident on the first fiber collimator 2, and the first fiber collimator 2 converts the broadband divergent beam into a broadband parallel Gaussian beam, and enters the transparent film 3;

[0044] ②The two light-transmitting surfaces of the transparent film 3 are perpendicular to the propagation direction of the parallel Gaussian beam, which can divide the wavefront of the broadband parallel Gaussian beam, and the broadband parallel Gaussian beam whose wavefront is divided is incident on the second fiber collimator 4;

[0045] ③ The Gaussian beam passing through the second fiber collimator 4 is converged into the second fiber 5 to construct a sub-wavefront fiber Mach-Zehnder interferometer.

[0046] Using the split-wavefront Mach-Zehnder...

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Abstract

The invention discloses a demultiplexing front Mach-Zehnder interferometer and a method based on a broadband optical fiber collimator, belonging to the technical field of optical fiber interferometers, comprising a first optical fiber, a first optical fiber collimator, and a second optical fiber collimator arranged in sequence. A collimator and a second optical fiber, wherein the first optical fiber collimator is connected behind the first optical fiber, the central axis of the first optical fiber collimator and the second optical fiber collimator are in a straight line, and the first optical fiber collimator There is a transparent film between the second optical fiber collimator and the second optical fiber collimator, and the second optical fiber is connected behind the second optical fiber collimator. The diameter of the beam is significantly enlarged relative to the mode field diameter of a single-mode fiber, which can greatly suppress diffraction and scattering losses. When the transparent film is inserted into the expanded beam along the direction perpendicular to the light propagation direction, a high-quality interference spectrum with great visibility and little loss can be obtained.

Description

technical field [0001] The invention relates to a split-wave front Mach-Zehnder interferometer and method based on a broadband optical fiber collimator, belonging to the technical field of optical fiber interferometers. Background technique [0002] Fiber Mach-Zehnder interferometer is one of the most commonly used fiber optic interferometers, and has a wide range of applications in optical coherence tomography, optical switches, modulators, filters, and physical, chemical, and biological sensing. However, compared with fiber-optic Fizeau interferometer and fiber-optic Fabry-Perot interferometer, fiber-optic Mach-Zehnder interferometer has two independent interference arms, which are susceptible to external interference and are not conducive to maintaining long-term stability. In recent years, many attractive design schemes have been proposed both at home and abroad in the research of online fiber optic Mach-Zehnder interferometers that are not sensitive to external disturba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/225G02B6/32G02B6/293
Inventor 李晓平马任德曹洪忠满忠晓夏云杰
Owner QUFU NORMAL UNIV
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