Coherent light generators – Particular component circuitry – For driving or controlling laser
Reexamination Certificate
2011-07-12
2011-07-12
Park, Kinam (Department: 2828)
Coherent light generators
Particular component circuitry
For driving or controlling laser
C372S038070, C372S038010, C372S038040
Reexamination Certificate
active
07978741
ABSTRACT:
The invention provides an optical transmitter that prevents the high frequency components in the driving signal from leaking to the external power supply in a wider frequency range. The transmitter provides a shun driving configuration with a switching transistor connected in parallel to the laser diode and a load transistor connected in serial to the parallel circuit of the switching transistor and the laser diode. The load transistor operates in the common base configuration, or the common gate configuration, by which the input impedance viewed from the laser diode becomes large, while, the output impedance viewed from the external power source becomes small. Thus, the high frequency components in the driving signal applied to the switching transistor can be suppresses to appear in the external power source.
REFERENCES:
patent: 6091449 (2000-07-01), Matsunaga et al.
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patent: 6522114 (2003-02-01), Bakker et al.
patent: 6618408 (2003-09-01), Mader et al.
patent: 7026655 (2006-04-01), Go et al.
patent: 2006/0088071 (2006-04-01), Hovakimyan
patent: 5-315686 (1993-11-01), None
patent: 2003-163547 (2003-06-01), None
patent: 2005-033019 (2005-02-01), None
Notification of Reasons of Rejection.
Park Kinam
Smith , Gambrell & Russell, LLP
Sumitomo Electric Industries Ltd.
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