Optical waveguide electrically controlled variable attenuator

Details Optical waveguide electrically controlled variable attenuator Optical waveguide electrically controlled variable attenuator

1998-02-10

1999-10-26

Ullah, Akm E.

Optical waveguides

Accessories

Attenuator

G02B 600

Patent

active

059742160

ABSTRACT:
In an optical waveguide electrically controlled variable attenuator using a dielectric substrate, light which has entered from the input port is split into TM mode and TE mode by a polarization beam splitter. After these modes are variably attenuated by respective directional coupler switches, a resulting TM mode and TE mode are coupled by a polarization coupler and output from the output port. Control voltages of the directional coupler switches are adjusted to a fixed ratio in such a manner that equal attenuation characteristics will be obtained for both the TM and TE modes. This makes it possible to obtain an attenuation characteristic that is independent of the polarized light.

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M. Kondo et al., "Rendering an LiNbO.sub.3 optical waveguide switch independent of polarization", Soc. Electronics Information and Communications, Semiconductor Materials Section, National Conf. Mar. 1987.

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