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Short-period Mach-Zehnder optical interferometer constructed by polarization-maintaining fiber couplers

A polarization-maintaining optical fiber and optical interferometer technology, applied in the coupling of optical waveguides, optics, instruments, etc., can solve the problems of poor optical interference effect and instability, and achieve the effect of avoiding the influence of interference effect

Inactive Publication Date: 2012-02-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to solve the problem that the optical interference effect of the large ΔL and short-period Mach-Zehnder optical interferometer becomes worse and unstable due to the change of the polarization state in the optical fiber and the ambient temperature

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  • Short-period Mach-Zehnder optical interferometer constructed by polarization-maintaining fiber couplers
  • Short-period Mach-Zehnder optical interferometer constructed by polarization-maintaining fiber couplers
  • Short-period Mach-Zehnder optical interferometer constructed by polarization-maintaining fiber couplers

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Embodiment 1

[0031] Embodiment one: see figure 1 , the short-period Mach-Zehnder optical interferometer constructed by the polarization-maintaining fiber coupler, including a laser, a polarizer, a 2*2 polarization-maintaining fiber coupler and a polarization-maintaining fiber.

Embodiment 2

[0032] Embodiment 2: This embodiment is basically the same as Embodiment 1, and the special features are as follows:

[0033] The present embodiment is a FSR=10GHz, the making of the Mach-Zehnder optical interferometer that temperature is controlled at 40 ℃: see appendix figure 2 And attached image 3 : FSR=10GHz of Mach-Zehnder optical interferometer, can calculate τ according to formula (4) mz = 0.1ns, The temperature is controlled at 40°C, and the required set voltage value Vs=(40+273.2)*10mV=3.132V can be calculated according to formula (5). According to the above principle, the optical fiber connected to the light source is first connected to the polarizer 2, so as to ensure that the light wave input into the polarization-maintaining fiber coupler is linearly polarized light. The polarizer 2 and one input end of the 2*2 polarization-maintaining fiber coupler 3 are connected through a polarization-maintaining pigtail, and the polarization-maintaining fiber fusion spli...

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Abstract

The invention relates to a short-period Mach-Zehnder optical interferometer constructed by polarization-maintaining fiber couplers, which comprises a polarizer and 2*2 polarization-maintaining fiber couplers and is matched with a temperature control circuit to maintain the stability thereof. The invention adopts the two polarization-maintaining fiber couplers, forms two-boom difference by using polarization-maintaining tail fiber of the polarization-maintaining fiber couplers, designs and manufactures the high-accuracy temperature control circuit to stabilize the performance of the optical interferometer and maintains FSR (Free Spectral Range) of the Mach-Zehnder optical interferometer at different environmental temperatures. Under the conditions that the FSR is equal to 10GHz, tau mz is equal to 0.1ns, the length difference of two zooms exceeds 20mm, and therefore, the extinction ratio of the Mach-Zehnder optical interferometer reaches 17dB and obtains better effect.

Description

Technical field: [0001] The invention relates to a short-period Mach-Zehnder optical interferometer constructed of a polarization-maintaining fiber coupler. The core idea of ​​the present invention is: in order to construct the Mach-Zehnder optical interferometer of small FSR, solve the technical problem that the optical interference effect is poor and unstable due to the change of the polarization state in the optical fiber and the ambient temperature. Two polarization-maintaining fiber couplers are used, and the polarization-maintaining fiber coupler's polarization-maintaining pigtail is used to form the difference ΔL between the two arms, and the polarization-maintaining fiber fusion splicer is used for fusion splicing to ensure the polarization direction of the two sections of fiber being fused The melting points are coincident. In order to ensure that the input light wave is linearly polarized light, a polarizer is added before the light wave enters the polarization-main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/28G02B6/26G05D23/20
Inventor 邹是桓宋英雄叶家骏魏林林如俭李迎春
Owner SHANGHAI UNIV