Laser diode driver with extinction ratio control

Details Laser diode driver with extinction ratio control Laser diode driver with extinction ratio control

2006-03-28

2006-03-28

Vannucci, James (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C347S237000

Reexamination Certificate

active

07020169

ABSTRACT:
Included are a light-emitting circuit having a laser diode (LD); an LD drive circuit for driving the light-emitting circuit; a bias circuit for adding a bias current to a pulse current outputted from the LD drive circuit; a light-receiving circuit for receiving monitoring light outputted from the light-emitting circuit; an I/V conversion circuit for subjecting an output from the light-receiving circuit to current-to-voltage conversion; a maximum-value detection circuit and an average-value detection circuit for respectively detecting the maximum and minimum values of an output voltage of the I/V conversion circuit; a first comparator for comparing the detected maximum value with a first reference value to feed back the comparison result to the LD drive circuit; and a second comparator for comparing the detected average value with a second reference value to feed back the comparison result to the bias circuit.

REFERENCES:
patent: 4729035 (1988-03-01), Tanioka
patent: 5488621 (1996-01-01), Slawson et al.
patent: 5710750 (1998-01-01), Tachibana
patent: 6259466 (2001-07-01), Oomura et al.
patent: 6590686 (2003-07-01), Sekiya et al.
patent: 6-164049 (1994-06-01), None

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