Mach-Zehnder interferometer based on three-core optical fiber
A three-core fiber, interferometer technology, applied in the direction of multi-layer core/clad fiber, clad fiber, optical waveguide coupling, etc. Effects of weight reduction, low energy dependence, high environmental tolerance
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Embodiment 1
[0020] A Mach-Zehnder interferometer based on a three-core fiber, such as figure 1 Shown is a schematic diagram of the Mach-Zehnder interferometer with single-mode input and single-mode output. In the figure, the interferometer is composed of a broadband light source, a single-mode input fiber 1, a three-core fiber 3, a single-mode output fiber 6 and a spectrum analyzer connected in sequence. The three-core optical fiber 3 includes a first core 31, a second core 32 and a third core 33, the three cores are arranged in parallel at equal intervals, and the second core 32 is located between the first core 31 and the third core. In the middle of the core 33, one end of the single-mode input fiber core 2 and the second fiber core 32 is fused, and the other end of the single-mode output fiber core 7 and the second fiber core 32 is fused; in the middle of the three fiber cores, the second fiber The middle position of the core 32 is cut with a laser to cut out the air layer 4, and the...
Embodiment 2
[0025] image 3 Shown is a schematic diagram of the structure of a Mach-Zehnder interferometer with multi-mode input and single-mode output. In the figure, in the interferometer structure, the single-mode input fiber core 2 adopts the multi-mode input fiber core, so that the single-mode input fiber 1 becomes a multi-mode input fiber, and the connection relationship of the various components is the same as that of the first embodiment. Above-mentioned first fiber core 31 and the 3rd fiber core 33 relative edge shortest distance h are 130 μ m, the length L of air layer 4 is 49 km, and width d is 110 μ m (such as figure 2 shown) to clean the optical fiber connection, and then encapsulate and cure with epoxy resin 5 .
[0026] The working process of the Mach-Zehnder interferometer with multi-mode input and single-mode output is the same as the first embodiment. The lengths of the multimode input optical fiber 1 and the single-mode output optical fiber 6 described in this embodi...
Embodiment 3
[0028] Figure 4Shown is a schematic diagram of the Mach-Zehnder interferometer structure using single-mode input and multi-mode output; in the figure, in the interferometer structure, the single-mode output fiber core 7 adopts the multi-mode output fiber core, so that the single-mode output fiber 6 It becomes a multimode output optical fiber, and the connection relationship of the various components is the same as that of the first embodiment. Above-mentioned first fiber core 31 and the 3rd fiber core 33 relative edge shortest distance h are 450 μ m, the length L of air layer 4 is 99 km, and width d is 430 μ m (such as figure 2 shown) to clean the optical fiber connection, and then encapsulate and cure with epoxy resin 5 .
[0029] The working process of the Mach-Zehnder interferometer with single-mode input and multi-mode output is the same as that of Embodiment 1. The lengths of the single-mode input optical fiber 1 and the multimode output optical fiber 6 described in t...
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