Planar optical waveguide circuit type variable attenuator

Details Planar optical waveguide circuit type variable attenuator Planar optical waveguide circuit type variable attenuator

2007-06-19

2007-06-19

Bovernick, Rodney (Department: 2874)

Optical waveguides

Integrated optical circuit

C385S003000, C385S004000, C385S140000

Reexamination Certificate

active

11352373

ABSTRACT:
Provided is a planar optical waveguide circuit type variable attenuator capable of light attenuation by an arbitrary value in a range from 0 to 10 dB and also by not less than 30 dB, which is small-sized and is of power saving type. The attenuator is composed of a Mach-Zehnder interferometer circuit30having input waveguides1a,1band an output waveguide1dwhich are formed on an optical waveguide layer3, and comprises a slit12formed on the waveguide layer in a longitudinally intermediate part of at least one of the optical waveguides1a,1b,1dand in a direction crossing the optical waveguides1a,1b,1d, and matching medium displacing means16a,16bfor displacing index-matching medium13in a part of the slit12from a position including a path of propagation light in the optical waveguides1a,1b,1d, and a position retracted from the path of propagation light.

REFERENCES:
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patent: 6240221 (2001-05-01), Thompson
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patent: 2003114358 (2003-04-01), None
Matsubara, et al., “PLC-Type Variable Optical Attenuator With Low Power Consumption and Low Polarization Dependent Loss”, The Institute of Electronics, Information and Communication Engineers, Mar. 3, 2003, p. 215.
Y. Hashizume, et al., “PLC-Type Variable Optical Attenuator With Low Polarizaiton Dependent Loss”, The Institute of Electronics, Information and Communication Engineers, Mar. 7, 2001, C-3-64, p. 229.

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