Electro-optic switching apparatus not requiring DC bias

Details Electro-optic switching apparatus not requiring DC bias Electro-optic switching apparatus not requiring DC bias

2007-07-17

2007-07-17

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave directional modulation

C359S245000, C359S255000

Reexamination Certificate

active

11083736

ABSTRACT:
An OFF state, maximum attenuation level, for an electro-optic attenuator/switch results when either a first or second control voltage is applied to the control input. An AC generator, coupled to the control input, generates minimum and maximum peak voltages that correspond to the first and second control voltages, respectively, so that the maximum attenuation level of the light beam being switched is provided by the electro-optic attenuator while either of the minimum and maximum peak voltages is applied to the control input. An ON state is achieved by introducing a voltage pulse with a magnitude corresponding to the minimum attenuation level. The ON voltage pulse is added to the square wave. This permits operation of the electro-optic switch in a normally OFF state without requiring a DC bias voltage.

REFERENCES:
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patent: 5448058 (1995-09-01), Arab-Sadeghabadi
patent: 5852507 (1998-12-01), Hall
patent: 0 436 344 (1991-07-01), None
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patent: WO 89 11675 (1989-11-01), None
Nakajima, H., Development on Guided-Wave Switch Arrays, IEICE Trans. Electron, Feb. 1999, pp. 297-304, vol. E82, No. 2, Japan.
Kirkendall, et al., Overview of High Performance Fibre-Optic Sensing, Journal of Physics, Sep. 2004, pp. R197-R216, United Kingdom.

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