Demultiplexing photodiode sensitive to plural wavelength bands

Details Demultiplexing photodiode sensitive to plural wavelength bands Demultiplexing photodiode sensitive to plural wavelength bands

1983-02-16

1986-12-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

357 30, H01J 4014

Patent

active

046266755

ABSTRACT:
A light-sensitive device is disclosed for separately detecting light of two different wavelength bands. Such a device can be used in optical data communication. The separate detection is accomplished by two separate pn junctions which are disposed on two different sides of a substrate and are optically in series. The pn junction lying in front in the light path responds to light of, e.g., 850 nm, but not to light in the range from 950 nm to 1,650 nm. The substrate acts as a filter and passes the light of longer wavelength while blocking the 850-nm light, so that the second pn junction is only reached by light in the range from 950 nm to 1,650 nm.

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patent: 4382265 (1983-05-01), Pearsall
patent: 4450463 (1984-05-01), Chin
IBM Technical Disclosure--vol. 12, #9, Feb. 1970, p. 1486--Woodall & Shang.

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