Laser driver circuit for externally modulated lasers

Details Laser driver circuit for externally modulated lasers Laser driver circuit for externally modulated lasers

2007-03-20

2007-03-20

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular component circuitry

For driving or controlling laser

C372S026000, C372S038010

Reexamination Certificate

active

10995684

ABSTRACT:
Systems and methods for biasing an externally modulated laser. An inductorless bias T network is provided that includes a terminating resistor in series with a capacitor. The capacitor is an open circuit for a bias signal and a virtual ground for an RF signal. Thus, the RF signal is terminated by the terminating resistor without dissipating the bias signal through a ground return path of the RF signal. Using a charge pump inverter, a positive supply can be used to positively bias a laser and negatively bias the external modulator through the terminating resistor. A negative power supply is not required. A swing voltage provided by the RF signal causes the external modulator to modulate the light emitted by the laser.

REFERENCES:
patent: 5182756 (1993-01-01), Waki et al.
patent: 5608561 (1997-03-01), Marcuse et al.
patent: 5706116 (1998-01-01), Sugata
patent: 5883910 (1999-03-01), Link
patent: 6542008 (2003-04-01), Daugherty et al.
patent: 2001/0054927 (2001-12-01), Zhou et al.

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