Optoelectric cross-point switch

Details Optoelectric cross-point switch Optoelectric cross-point switch

H - Electricity

03

K

344/52, 328/114.

H03K 17/78 (2006.01) H04Q 3/52 (2006.01)

Patent

CA 1130398

TITLE OPTOELECTRIC CROSS-POINT SWITCH INVENTORS Elmer H. Hara R. Ian MacDonald ABSTRACT OF THE DISCLOSURE The optoelectronic cross-point switch suitable for a broadband switching array includes a photodiode which converts an optical signal impinging upon it to an electronic signal and a biasing circuit for selectively reverse biasing the photodiode to render the photodiode responsive to the optical signal or forward biasing the photodiode to render the photodiode substantially non-responsive to an optical signal. The biasing circuit consists of positive and negative voltage sources and a controllable switch to connect the sources to the photodiode load circuit which is connected to the photodiode for developing the output signal may consist of a single resistor, a pair of series resistors, an operational amplifier with feedback or an rf transformer. The load circuit can also include an rf switching diode connected to the photodiode to improve isolation and to reduce the electrical power required to forward bias the photodiode.

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