Lithium niobate optical TE-TM mode splitter

Details Lithium niobate optical TE-TM mode splitter Lithium niobate optical TE-TM mode splitter

1994-10-18

1995-07-25

Bovernick, Rodney B.

Optical waveguides

With optical coupler

Particular coupling structure

385 14, 385 28, 385142, G02B 626

Patent

active

054369924

ABSTRACT:
We disclose a new optical TE-TM mode splitter on lithium niobate. The splitter is fabricated by using an asymmetric Y-junction structure which is composed of a straight waveguide, and two branch waveguides. The straight waveguide is the input one that can guide randomly-polarized light (i.e. both TE and TM modes). The two branch waveguides are the output ones, and one of them can guide only the TE mode, the other can guide only the TM mode. Because the output waveguides can individually guide the TE and TM modes, the input modes are then split by the branch waveguides. The input waveguide is fabricated by diffusing titanium into lithium niobate. The two output waveguides are made by nickel indiffusion and magnesium-oxide induced lithium outdiffusion or proton exchanged techniques.

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Way-Seen Wang & Pei-Kuen Wei, "Fabrication of Lithium Niobate Optical Channel Waveguides by Nickel Indiffusion", Microwave and Optical Technol. Lett., vol. 7, No. 5, pp. 219-221, 1994.
Way-Seen Wang and Pei-Kuen Wei, "A TE-TM Mode Splitter on Lithium Nobate Using Ti, Ni and MgO Diffusions", IEEE Photon, Technol. Lett., vol. 6, No. 2, pp. 245-248, 1994.
Way-Seen Wang and Pei-Kuen Wei, "Novel TE-TM Mode Splitter on Lithium Niobate Using Nickel Indiffusion and Proton Exchange Techniques", Electronics Lett., vol. 30, No. 1, pp. 35-37, 1994.
C. S. Lau, P. K. Wei, C. W. Su and W. S. Wang, "Fabrication of Magnesium Oxide Induced Lithium Outdiffusion Waveguides", Photon. Technol. Lett., vol. 4, No. 8, pp. 872-875, 1992.
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