Optical communications – Transmitter – Including compensation
Reexamination Certificate
2006-06-20
2006-06-20
Phan, Hanh (Department: 2638)
Optical communications
Transmitter
Including compensation
C398S182000, C398S183000, C398S186000, C398S192000, C398S193000, C398S194000, C398S195000, C372S038060, C372S034000, C372S032000, C372S029011, C372S033000, C372S043010, C372S044010, C361S018000, C315S291000, C331S094100
Reexamination Certificate
active
07065303
ABSTRACT:
Systems, apparatuses, and methods for driving an optical source with a current source. The optical source driver has a primary control loop having a DC—DC converter and an operational amplifier, wherein the DC—DC converter has a power input, a power output connected to the input of the optical source, and a control input, and wherein the operational amplifier has a first input connected between the optical source and the current source, a second input, and an output connected to the control input of the DC—DC converter, for controlling the output of the DC—DC converter in response to a control signal at the second input. In addition, the optical source drive includes an override control loop having a power input, a power output connected to an input of the optical source, a switch between the power input and the power output, and a comparator having a first input connected between the optical source and the current source, having a second input, and having an output connected to a control input of the switch, for selectively connecting the power input to the power output when a signal between the optical source and the current source falls below a predetermined point.
REFERENCES:
patent: 4639924 (1987-01-01), Tsunekawa
patent: 5463648 (1995-10-01), Gibbs
Kenyon, Kevin, “Visible-Laser Driver Has Digitally Controlled Power and Modulation”, Electronic Design, Mar. 23rd1998, p. 132.
IC-VJ, IC-VJZ Laser Diode Controller Data Sheet by IC-Haus Corporation.
Williams, Jim, Current Sources for Fiber-Optic Lasers: A Compendium of Pleasant Current Events, Aug. 22, 2002, pp. 69-78, EDN.
Corvis Corporation
Phan Hanh
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