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Double-channel optical performance testing device of integrated waveguide modulator and polarization crosstalk identification and processing method thereof

A technology of integrated waveguide and polarization crosstalk, which is applied in the field of dual-channel optical performance testing devices, can solve the problems that do not involve the optical performance of the output channel of the Y waveguide device and its difference test and evaluation, and achieve high test efficiency and good stability , the effect of small environmental impact

Active Publication Date: 2014-04-23
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current testing devices and methods have not yet involved in the comprehensive testing and evaluation of the optical performance of different output channels of Y waveguide devices and their differences.

Method used

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  • Double-channel optical performance testing device of integrated waveguide modulator and polarization crosstalk identification and processing method thereof
  • Double-channel optical performance testing device of integrated waveguide modulator and polarization crosstalk identification and processing method thereof
  • Double-channel optical performance testing device of integrated waveguide modulator and polarization crosstalk identification and processing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144]Embodiment 1——Waveguide measurement device based on Mach-Zehnder demodulation interferometer

[0145] Device measurement devices such as image 3 As shown, the device selection and parameters of the white light interferometry device are as follows:

[0146] (1) The central wavelength of the broadband light source 11 is 1550nm, the half-spectrum width is greater than 45nm, the output power of the fiber is greater than 2mW, the spectral ripple of the light source is <0.05dB (the peak amplitude is about -60dB), and the optical path range of the coherence peak is 4-7mm; DFB The half-spectrum width of the light source 311 is less than 50MHz, and the output power of the fiber is greater than 1mW;

[0147] (2) 2 / 98 fiber coupler 12 working wavelength 1550nm, splitting ratio 2:98;

[0148] (3) Optical fiber isolator 16 has a working wavelength of 1550nm, insertion loss of 0.8dB, and isolation >35dB;

[0149] (4) The optical fiber polarizer 17, the working wavelength of the fi...

Embodiment 2

[0159] Embodiment 2——Double-channel simultaneous measurement of the Y-waveguide device with the slow axis of the pigtail and the fast axis of the waveguide chip

[0160] The measurement device diagram of the Y waveguide device is shown in the figure image 3 As shown, the optical performance measurement process is as follows Figure 4 shown.

[0161] (1) From step 701, it can be seen that the length l of the Y waveguide input pigtail is measured W-i is 1.53 meters;

[0162] (2) It can be known from step 702 that the input pigtail l W-i The theoretical optical path length (Δn f Press 5×10 -4 Count) S W-i =0.765mm; while S ripple =4~7mm, it can be seen that the input extension fiber must be welded;

[0163] (3) According to step 703, it can be known that connecting the extension fiber l f-i must be at least 7×10 in length -3 / 5×10 -4 =14 meters, the actual selection is 15 meters;

[0164] (4) According to step 704, it can be seen that the length of the measured waveg...

Embodiment 3

[0173] Embodiment 3——Measurement of the change of two output channels of Y waveguide device with temperature

[0174] The measurement device of the Y waveguide device is still as image 3 As shown, the difference from Example 2 is that the other Y-waveguide 2 to be tested connected to the broadband light source 1 and the optical path demodulation device 3 is placed in a temperature control box and changed from -50°C to 80°C Change the temperature, as in Figure 4 In the measurement process and data analysis method shown, various optical variations of the Y waveguide device with temperature are obtained from the first measurement channel and the second measurement channel at the same time.

[0175] The test results show that the crosstalk at the coupling point of the input / output pigtail and the waveguide chip is very sensitive to temperature, such as Figure 8-10 As shown, the power coupling crosstalk between the Y waveguide input pigtail, the first output channel pigtail, t...

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Abstract

The invention particularly relates to a double-channel optical performance testing device of an integrated waveguide modulator and a polarization crosstalk identification and processing method thereof and belongs to the technical field of measurement of optical devices. The double-channel optical performance testing device of the integrated waveguide modulator comprises a high-polarization stability wide spectrum light source, an integrated waveguide modulator to be detected, an optical distance demodulating device and a polarization crosstalk detecting and recording device. According to the device, the system structure is simplified and the testing function is enriched; the cost is reduced and the testing efficiency is improved; the double-channel optical performance testing device can be widely applied to a quantitative test of the optical performance of integrated waveguide devices with an extinction ratio greater than 80dB.

Description

technical field [0001] The design of the invention belongs to the technical field of optical device measurement, and specifically relates to a dual-channel optical performance testing device of an integrated waveguide modulator and a polarization crosstalk identification and processing method thereof. Background technique [0002] Multifunctional integrated optical devices are commonly known as "Y waveguides", generally using lithium niobate materials as the substrate, which highly integrates single-mode optical waveguides, optical beam splitters, optical modulators and optical polarizers, forming an interference fiber optic gyroscope (FOG) and the core components of the fiber optic current transformer determine the measurement accuracy, stability, volume and cost of the fiber optic sensing system. [0003] The important parameters of the Y waveguide device mainly include: the extinction ratio of the waveguide chip, the crosstalk of the pigtail, the optical path difference o...

Claims

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Application Information

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IPC IPC(8): G01M11/02
Inventor 杨军苑勇贵吴冰彭峰苑立波
Owner HARBIN ENG UNIV
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