Coherent light generators – Particular component circuitry – For driving or controlling laser
Reexamination Certificate
2006-05-30
2006-05-30
Minsun, Harvey (Department: 2828)
Coherent light generators
Particular component circuitry
For driving or controlling laser
C372S038080
Reexamination Certificate
active
07054344
ABSTRACT:
A circuit for equalizing transmission line loss of a laser drive signal includes a laser driver, a laser diode, and a transmission line for connecting the laser driver to the laser diode. The laser driver includes a differential pair of transistors, a modulation current source and two sets of source impedance circuits. Each set of source impedance circuits is configured to produce a frequency response for compensating the frequency response of the lossy transmission line at a distinct corresponding operating frequency. The set of source impedance circuits may be tuned to generate approximately zero impedance when the operating frequency is approximately zero. Hence a lower voltage power supply can be used to power both the laser driver and the laser diode, which in turn reduces the power consumption of the circuit.
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Finisar Corporation
Minsun Harvey
Nguyen Tuan N.
Workman Nydegger
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