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Coherent-Coupling-Based Wide-Angle Optical Polarization Splitter

Coherent-Coupling-Based Wide-Angle Optical Polarization Splitter. 報 告 者 ：陳 嘉 怜 指導教授：王 維 新 博 士. Introduction Principle of Operation Process Steps and Results Future Work References. Outline. Introduction Principle of Operation Process Steps and Results Future Work References.

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Coherent-Coupling-Based Wide-Angle Optical Polarization Splitter

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  1. Coherent-Coupling-Based Wide-Angle Optical Polarization Splitter 報 告 者 ：陳 嘉 怜 指導教授：王 維 新 博 士

  2. Introduction Principle of Operation Process Steps and Results Future Work References Outline

  3. Introduction Principle of Operation Process Steps and Results Future Work References

  4. Motivation: TE and TM mode have different electrooptic coefficients in birefringence material. Principle: Mode interference Mode sorting Structure: Directional coupler type Y-branch type Material: Ti ; Ni ; PE ; APE ; Zn / Ni In my work: Structure: Y-branch type (simplified coherent couple) Material: Zn / Ni Polarization Splitter

  5. Introduction Principle of Operation Process Steps and Results Future Work References

  6. Ti:LiNbO3 TE TE / TM TM L Ni:LiNbO3 Z-cut LiNbO3 TE / TM Ni:LiNbO3 TE TM Ni:LiNbO3 Z-cut LiNbO3 Principle of Operation • Vary the length L can • make TM mode coupled to another waveguide. (a) Directional coupler type • Curved bend • Chamfered bend • Prism-assisted bend • Substrate prism bend • Coherently-coupled bend (b) Y-branch type

  7. Phase rocking region 4Θ 3Θ 2Θ Θ Phase rocking region 4Θ 3Θ Θ Coherently Coupler Bend (a)standard structure (b)new structure

  8. With a suitable coupling length, TM wave can be coupled to the S-band but not TE wave . TE / TM Zn / Ni:LiNbO3 TE TM Z-cut LiNbO3 Zn / Ni:LiNbO3 Polarization Splitter Coherently-coupled Bend (S-band)

  9. Introduction Principle of Operation Process Stepsand Results Future Work References

  10. Ni Ni Zn Zn Cr Zn Ni Zn Cr Cr Cr (b) (a) (c) (e) (d) Process Steps

  11. TM TM Θ 3Θ L1 5Θ L2 L2 6Θ L3 5Θ L2 3Θ Θ L2 TM L2 Coherently-Coupled Y-branch Waveguide W • L1 = L2+15 / tan (0.5) • L2 = coupling length • L3 = 1000μm • W = 6μm

  12. Waveguide Width Zn Thickness Ni Thickness Diffusion Time Diffusion Temp. Coupling Length 6μm 650 Å 200 Å 1.5 hr 800 ℃ 200μm 6μm 650 Å 200 Å 1.5 hr 800 ℃ 250μm 6μm 650 Å 200 Å 1.5 hr 800 ℃ 300μm 6μm 650 Å 200 Å 1.5 hr 800 ℃ 350μm Process Parameters For TM Mode

  13. TM Mode Power Splitter TM 2.2 W Laser Wavelength = 1.55m Pumping Current = 45 mA Coherent Length = 350 m 0.42 W

  14. Straight Waveguide TM mode 2.2 W

  15. S-band Waveguide TM mode Coupling Length = 350 m 0.42 W

  16. Introduction Principle of Operation Process Steps and Results Future Work References

  17. Vary the coupling length to make sure if 350 m is the best coupling length. We have mask for the coupling lengths 400 m, 450 m, 500 m, and 550 m. When the best one is obtained, a new mask is required for the proposed polarization splitter. Future Work

  18. Ruey-Ching Twu, Chia-Chih Huang and Way-Seen Wang “TE-TM Mode Splitter With Heterogeneously Coupled Ti-Diffused And Ni-Diffused Waveguides On Z-cut Lithium Niobate,”Electron. Lett., 3rd, vol. 36, no. 3, pp. 220-221, Feb. 2000. Jiun-Yun Li, Wen-Hao Hsu, and Way-Seen Wang, Member, IEEE “A TH-TM Mode Splitter Using Annealed Proton Exchange And Zinc/Nickel Co-Diffusion Waveguides” J.J. Su and W. S. Wang, “Novel coherently-coupled multi-sectional bending optical waveguide,” Photo.Tech. Letters, August 2002. References

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