Optical receiver with integrated variable attenuator

Details Optical receiver with integrated variable attenuator Optical receiver with integrated variable attenuator

1998-03-07

2000-05-23

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502011, 2502082, G01J 134

Patent

active

06066844&

ABSTRACT:
An optical assembly for detecting an optical signal from a signal source in systems where the intensity of the optical signal may surpass the operational range of the optical detector being used. The optical assembly includes an optical detector for converting the optical input signal into a corresponding electrical output signal. The optical detector has a set operational range of input signal intensities. An attenuator is disposed between the optical detector and the signal source. The attenuator is capable of reducing the signal intensity of the optical signal if required so that the optical signal falls within the operational range of the optical detector. A controller is electronically coupled to both the optical detector and the attenuator. The controller controls the attenuator as a function of the output signal of the optical detector, wherein the attenuator attenuates the optical signal to fall within the operational range of the optical detector.

REFERENCES:
patent: 4644145 (1987-02-01), Gundner
patent: 5767997 (1998-06-01), Bishop et al.
Goossen et al., Silicon Modulator Based on Mechanically-Active Anti-Reflection Layer with 1 Mbit/sec Capability for Fiber-in-the-Loop Applications, IEEE Photonics Technology Letters, vol. 6 No. 9, pp. 1119-1121, Sep. 1994.

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