Optical attenuator apparatus without steep level variation

Details Optical attenuator apparatus without steep level variation Optical attenuator apparatus without steep level variation

1992-02-11

1993-05-11

Ben, Loha

Optical: systems and elements

Absorption filter

359889, 250205, 362293, G02B 522

Patent

active

052106578

ABSTRACT:
A first optical attenuation filter is arranged in a predetermined optical path and attenuates light to be attenuated with a first variable attenuation amount. A second optical attenuation filter is arranged in the predetermined optical path and attenuates, with a second variable attenuation amount, the light which has been transmitted through the first optical attenuation filter. The first and second optical attenuation filters can be driven in the forward and reverse directions and each has an attenuation amount characteristic which changes monotonously in both the forward and reverse directions. An attenuation amount setting section sets a desired attenuation amount to the light to be attenuated. First and second drivers are coupled to drive the first and second optical attenuation filters in the forward and reverse directions, respectively. A controller controls driving directions and driving amounts of the first and second optical attenuation filters through the first and second drivers in accordance with the desired attenuation amount so that an algebraic sum of the first and second attenuation amounts finally becomes equal to the desired attenuation amount and a variation in attenuation amount is decreased as a whole, thereby providing a smooth attenuation characteristic.

REFERENCES:
patent: 2960911 (1960-11-01), Coote et al.
patent: 4443696 (1984-04-01), Taboada
patent: 4800474 (1989-01-01), Bornhorst
patent: 4984143 (1991-01-01), Richardson
Applied Optics, vol. 19, No. 14, Jul. 15, 1980, pp. 2408-2412; New York, New York, Computer-Controllable Wedged-Plate Optical Variable Attenuator, R. Bennett, R. Byer.

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