Statistic parameterized control loop for compensating power...

Details Statistic parameterized control loop for compensating power... Statistic parameterized control loop for compensating power...

2005-06-21

2005-06-21

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular beam control device

Having particular beam control circuit component

C372S029011, C372S026000, C372S024000, C372S038100, C372S038010, C372S038020, C372S033000

Reexamination Certificate

active

06909731

ABSTRACT:
An automatic closed loop power control system is described for simultaneously adjusting an output power and an extinction ratio P1/P0of a laser diode in order to maintain a desired average output power and a desired extinction ratio. The bias current component of a laser diode drive current is adjusted to compensate for changes in the average output power caused by ambient characteristics such as temperature and aging. Simultaneously, a modulation current component of the laser diode drive current is adjusted to maintain an extinction ratio of the laser diode output signal. The bias current and modulation current adjustments are based on the second order statistics of an average output power of the laser diode and a variance in the power output of the laser diode.

REFERENCES:
patent: 5754577 (1998-05-01), Casper et al.
patent: 2004/0131094 (2004-07-01), Miremadi
patent: 1 083 643 (2001-03-01), None
GiGa. product GD16521, 2.5 Gbips re-timing laser driver, pp. 1-13, Feb. 1, 2001.
Summit Microelectronics, Inc., product SML2108, Laser Diode Adaptive Power Controller, pp. 1-21, Oct. 3, 2001.

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