Optical switch, optical modulator and wavelength variable...

Details Optical switch, optical modulator and wavelength variable... Optical switch, optical modulator and wavelength variable...

2008-04-08

2008-04-08

Font, Frank G. (Department: 2883)

Optical waveguides

With optical coupler

Particular coupling structure

C385S039000, C385S040000, C385S041000, C385S050000, C385S129000, C385S130000, C385S131000, C385S132000, C385S141000, C385S142000, C385S144000

Reexamination Certificate

active

07356227

ABSTRACT:
An optical switch, an optical modulator, and a wavelength variable filter each have a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch includes a 3-dB coupler placed on an output, a 3-dB coupler placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3(0<x<1) and KxLi1-xTayNb1-yO3(0<x<1, 0<y<1), or KTaxNb1-xO3or KxLi1-xTayNb1-yO3.

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