Abstract
AbstractA new type of polarization‐independent optical switch with a cladding layer and a TE/TM mode splitter was designed and fabricated. These devices were composed of a Y‐branched phase modulator and a nonsymmetric X‐branched waveguide with planar electrodes formed on an X‐cut LiNbO3 substrate to propagate light in the Z‐direction.The TE/TM mode lights propagating through the Y‐branched waveguide have opposite polarity but they receive equal electrooptic effect. Therefore, it is possible to achieve polarization‐independent optical switching and TE/TM splitting simply by adjusting the cladding layer formed on the Y‐branch.This paper describes the theoretical and experimental result of these functions. When the cladding layer was formed by using photoresist, polarization‐independent switching was achieved when the length of the photoresist lr was 6 mm (crosstalk < −20 dB, switching voltage = 16 V). When lr = 3 mm, TE/TM mode splitting was achieved (crosstalk < −18 dB). Based on this device principle, a waveguide‐type polarizer was formed and an extinction ratio higher than 30 dB was achieved.
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