Electro-optic depolarization switch on y-cut LiNbO3 proton-exchanged channel waveguides

Chen, Ray T.
June 1989
Applied Physics Letters;6/26/1989, Vol. 54 Issue 26, p2628
Academic Journal
We report the first electro-optic depolarization (TE guided mode to TM substrate modes) switch on y-cut LiNbO3 proton-exchanged channel waveguides operating at 632.8 nm. Tunability of the waveguide ordinary and extraordinary indices through thermal annealing provides an alternative way to reduce the drive voltage. An extinction ratio of 13.5 dB is achieved with 10 V applied voltage on a switch with 4 μm channel width and 3 mm electrode length. The measured capacitance of the electrode is 4.2 pF, which gives a theoretical modulation bandwidth of 1.5 GHz in a 50 Ω lumped electrode structure.


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