Motor driven variable optical attenuator with IR sensor...

Details Motor driven variable optical attenuator with IR sensor... Motor driven variable optical attenuator with IR sensor...

2008-03-29

2010-06-22

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

C385S140000

Reexamination Certificate

active

07741606

ABSTRACT:
Attenuators used to regulate optical signals are disclosed. According to one aspect of the present invention, an assembly including an IR source and an IR sensor is provided to sense blockage of optical signals transmitted between two collimators via a fixed common light blocker that is driven by a stepper motor. The movement of the light blocker is sensed by a sensing assembly including an IR source and IR sensor. By detecting the photocurrent from the IR sensor and a feedback circuit, the attenuation of the optical signals can be well controlled.

REFERENCES:
patent: 4545659 (1985-10-01), Swinehart et al.
patent: 5701525 (1997-12-01), Caterino et al.
patent: 7504630 (2009-03-01), Wang et al.
patent: 7529459 (2009-05-01), Wang et al.
patent: 2001/0036333 (2001-11-01), Kasuga et al.
patent: 2002/0146201 (2002-10-01), Suzuki et al.

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