Electrically controllable optical attenuator

Details Electrically controllable optical attenuator Electrically controllable optical attenuator

1997-12-24

1999-09-21

Ullah, Akm E.

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

G02F 1035

Patent

active

059564377

ABSTRACT:
A known form of electrically controlled optical attenuator is formed by a mach Zehnder waveguide configuration with a variable refractive index element in one arm to modify the undulatory spectral characteristic of the network to give a specific attenuation at a specific wavelength. The spectral characteristic of the network makes the attenuation that it provides wavelength dependent. An attenuator with a wavelength dependence of reduced magnitude is provided by the series combination of two Mach Zehnder networks, one having an electrically controllable optical path length adjuster in its longer interference arm, and the other with its adjuster in its shorter arm.

REFERENCES:
patent: 3634695 (1972-01-01), Barringer
patent: 5085501 (1992-02-01), Sakuma
patent: 5323406 (1994-06-01), Yee
patent: 5535001 (1996-07-01), Tajima
patent: 5572350 (1996-11-01), Spanke
patent: 5771255 (1998-06-01), Horichi et al.

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