Detector for determining the wavelength of an optical signal

Details Detector for determining the wavelength of an optical signal Detector for determining the wavelength of an optical signal

1995-06-23

1997-06-10

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250226, 257440, H01J 4014

Patent

active

056378629

ABSTRACT:
An optical detector for determining the wavelength of an optical signal iudes a semiconductor material in the path of the optical signal having a bandgap less than the optical signal. A conductive layer is positioned on the semiconductor material and a plurality of conductive pads are also positioned on the semiconductor material to delineate individual photodetectors. The pads have a common node established by the conductive layer. The optical detector produces a plurality of photocurrents between the pads and the conductive layer in response to the optical signal which photocurrents can be measured and compared to determine the wavelength of the optical signal. A system for determining the wavelength of the optical signal includes a plurality of optical detectors numbered 1 to n positioned sequentially in the path of the optical signal. The detectors produce photocurrents which are converted into digital signals. A microprocessor receives the digital signals and determines a ratio therebetween. A memory accessible by the microprocessor relates the ratio and the nth numbered detector to the wavelength of the optical signal.

REFERENCES:
patent: 4749851 (1988-06-01), Wolffenbuttel
patent: 4804833 (1989-02-01), Matsubara et al.
patent: 4975567 (1990-12-01), Bishop et al.
patent: 5032710 (1991-07-01), Nojiri
patent: 5270536 (1993-12-01), Malhotra

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