Acta Optica Sinica, Volume. 40, Issue 6, 0613001(2020)
Test Method for LiNbO3 Integrated Y-Waveguide Based on Polarization Crosstalk Analyzer
Figures & Tables(7)
Fig. 1. Distributed polarization crosstalk analyzer. (a) Set-up diagram; (b) test principle
Fig. 3. Test crosstalk diagrams of Y-waveguide with different branches. (a) Y1 waveguide upper branch; (b) Y1 waveguide lower branch; (c) Y2 waveguide upper branch; (d) Y2 waveguide lower branch
Fig. 4. Schematic diagram and test results of the single polarized fiber. (a) Schematic diagram; (b) test results
Table 1. Y-waveguide parameters setting
View tableTable 1. Y-waveguide parameters setting
Fiber Length /m Birefringence /10-4 Optical path difference /mm Y1 Y2 Y1 Y2 Y1 Y2 Upper branch Lower branch Upper branch Lower branch Upper branch Lower branch Upper branch Lower branch Upper branch Lower branch Upper branch Lower branch PMF1 0.887 0.887 0.887 0.887 PMF2 1.15 1.15 1.15 1.15 4.1 4.1 4.1 4.1 0.47 0.47 0.47 0.47 PMF3 4.5 4.5 6 4.5 7.24 7.24 7.24 7.24 3.25 3.25 4.34 3.25 PMF4 1.60 1.60 1.98 1.98 5.0 5.0 5.0 5.0 0.80 0.80 0.99 0.99 Y-waveguide 0.016 0.016 800 800 1.28 1.28 1.28 1.28 PMF5 1.85 2.05 2.15 2.03 5.0 5.0 5.0 5.0 0.92 1.02 1.07 1.01 PMF6 1.4 1.4 1.4 1.4 4.1 4.1 4.1 4.1 0.57 0.57 0.57 0.57 PMF7 1.003 1.003 1.003 1.003 *PMF1 and PMF7 are the pigtails of internal polarizer and analyzer, respectively, and the optical path difference Δ is a fixed value.
Table 2. Analysis of Y1-waveguide test results
View tableTable 2. Analysis of Y1-waveguide test results
Peak Theoretical position Original position Original value /mm Experimental value /mm Xtalk /dB Meaning Upper branch Lower branch Upper branch Lower branch Upper branch Lower branch B Δ2 Δ2-Δ7 -0.53 -0.53 -0.52 -0.51 -52.92 -56.93 PMF2 and PMF3 fusion joints C Δ3 Δ3-Δ7 2.25 2.25 2.21 2.20 -54.01 -53.96 Waveguide input pigtail and PMF3 fusion joint D Δ3+Δ4 Δ3+Δ4-Δ7 3.05 3.05 3.07 3.03 -53.35 -52.93 Waveguide input pigtail and waveguide connection point E Δ5+Δ6+Δ7 Δ5+Δ6 1.49 1.59 1.46 1.62 -38.66 -46.99 Waveguide output pigtail and waveguide connection point F Δ6+Δ7 Δ6 0.57 0.57 0.55 0.55 -40.78 -38.60 Waveguide output pigtail and jumper fusion joint G Δ7 0 0 0 0 0 -28.23 -27.36 Polarization crosstalk analyzer port Yx Δ3+Δ4+ΔY1 Δ3+Δ4+ΔY1-Δ7 3.69 3.69 3.63 3.57 -59.12 -58.05 Y-waveguide internal defect point
Table 3. Analysis of Y2-waveguide test results
View tableTable 3. Analysis of Y2-waveguide test results
Peak Theoretical position Original position Original value /mm Experimental value /mm Xtalk /dB Meaning Upper branch Lower branch Upper branch Lower branch Upper branch Lower branch B Δ2 Δ2-Δ7 -0.53 -0.53 -0.51 -0.52 -56.45 -52.45 PMF2 and PMF3 fusion joints C Δ3 Δ3-Δ7 3.34 2.25 3.29 2.26 -52.63 -47.34 Waveguide input pigtail and PMF3 fusion joint D Δ3+Δ4 Δ3+Δ4-Δ7 4.33 3.24 4.32 3.22 -56.72 -59.38 Waveguide input pigtail and waveguide connection point E Δ5+Δ6+Δ7 Δ5+Δ6 1.64 1.58 1.67 1.65 -40.28 -32.16 Waveguide output pigtail and waveguide connection point F Δ6+Δ7 Δ6 0.57 0.57 0.59 0.54 -29.38 -34.67 Waveguide output pigtail and jumper fusion joint G Δ7 0 0 0 0 0 -29.40 -34.92 Polarization crosstalk analyzer port Yx Δ3+Δ4+ΔY1 Δ3+Δ4+ΔY1-Δ7 4.97 3.88 4.96 3.83 -56.68 -58.33 Y-waveguide internal defect point
Tools
Get Citation
Copy Citation Text
Huanhuan Zou, Xiaotian Yao, Chao Yu, Yiqing Zhu. Test Method for LiNbO3 Integrated Y-Waveguide Based on Polarization Crosstalk Analyzer[J]. Acta Optica Sinica, 2020, 40(6): 0613001
Paper Information
Category: Integrated Optics
Received: Oct. 17, 2019
Accepted: Nov. 29, 2019
Published Online: Mar. 6, 2020
The Author Email: Zhu Yiqing (zhuyq11@126.com)
© Copyright 2018-2021 | Chinese Laser Press.
All Rights Reserved 沪ICP备15018463号-20