Optical signal summing device

Details Optical signal summing device Optical signal summing device

1989-12-11

1991-03-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

324 77K, 343843, H01J 4014

Patent

active

050013360

ABSTRACT:
A device for receiving intensity modulated optical input signals, and producing an electronic output signal having a magnitude corresponding to the sum of the intensities of the input signals. The device comprises a plurality of photodetectors for receiving the input signals, the photodetectors being connected in parallel between first and second conductor lines. The photodetectors are reverse biased, preferably through a low pass filter, and a high pass filter is positioned between the conductor lines and a pair of output terminals at which the output signal is produced. The device may also include frequency compensation and/or impedance matching means connected between the high pass filter and the output terminals. Where the input signals are provided on fiber-optic cables or optical waveguides, means may also be provided for positioning the fiber-optic cables or waveguides such that the input signals are efficien=tly coupled onto the photodetectors.

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patent: 4686533 (1987-08-01), MacDonald et al.
patent: 4885589 (1989-12-01), Edward et al.

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