High frequency analog switch for use with a laser diode

Details High frequency analog switch for use with a laser diode High frequency analog switch for use with a laser diode

1996-08-30

1998-06-16

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327583, 327 65, 369116, 372 38, 372 26, H03K 342, H01S 3096

Patent

active

057677042

ABSTRACT:
In a laser diode which forms read and write functions upon an electro-optic memory, a drive circuit provides power modulation during the read function and sufficient power to perform a write function. During a read function, transistors connected in an emitter coupled switch pair modulate the power delivered to the laser diode. At the emitters of each transistors are a pair of Schottky diodes which enhance the switching speeds of the transistors. Logic is provided to completely turn on the read switch during the time the write switch is on in order to provide sufficient power to the laser diode in order to perform a write function.

REFERENCES:
patent: 4647792 (1987-03-01), Meslener et al.
patent: 4709370 (1987-11-01), Bednarz et al.
patent: 5015873 (1991-05-01), Hirayama
patent: 5097145 (1992-03-01), Hayashi
patent: 5197059 (1993-03-01), Minami et al.
patent: 5253198 (1993-10-01), Birge et al.
patent: 5276671 (1994-01-01), Minami et al.
patent: 5309461 (1994-05-01), Call et al.
patent: 5438581 (1995-08-01), Reele

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