Coherent light generators – Particular component circuitry – Optical pumping
Patent
1997-05-12
1999-10-05
Lee, John D.
Coherent light generators
Particular component circuitry
Optical pumping
372 46, H01S 310
Patent
active
059635703
ABSTRACT:
A control circuit for an injection laser provides a pre-bias current which prevents clipping induced errors in the laser output. An analog modulating signal is provided directly to the laser which receives the sum of a feedback current (Ifb) and a current source (Io) as the pre-bias current (Ipb). A monitor diode detects the laser light output and provides a current (Idet). A feedback circuit operates in a limited dynamic range, e.g. I.sub.l +/-40 mA or is incapable of outputting a negative current (Ifb>0). The feedback circuit responds to changes in Idet and adjusts the laser pre-bias current to hold Idet equal to a preset value, which effectively holds the laser's average output power constant. If the pre-bias current necessary to hold Idet fixed falls below some minimum level, Imin, the feedback circuit will run out of dynamic range and the laser's average power will increase. By preventing Ipb from falling below Imin clipping induced errors and distortion are avoided.
REFERENCES:
patent: 3946335 (1976-03-01), DeLoach, Jr. et al.
patent: 4009385 (1977-02-01), Sell
patent: 4081670 (1978-03-01), Albanese
patent: 4109217 (1978-08-01), Brackett et al.
patent: 4292606 (1981-09-01), Trimmel
patent: 4355395 (1982-10-01), Salter et al.
patent: 4484331 (1984-11-01), Miller
patent: 4701609 (1987-10-01), Koishi et al.
patent: 4876442 (1989-10-01), Fukushima
patent: 4903273 (1990-02-01), Bathe
patent: 4945541 (1990-07-01), Nakayama
patent: 4958926 (1990-09-01), Bu-Abbud
patent: 5073983 (1991-12-01), Pfizenmayer
patent: 5260955 (1993-11-01), Davis et al.
patent: 5402433 (1995-03-01), Stiscia
patent: 5412675 (1995-05-01), Odagawa
patent: 5488621 (1996-01-01), Slawson et al.
patent: 5675599 (1997-10-01), Abe et al.
Gnauck Alan H.
Woodward Sheryl Leigh
AT&T Corp.
Lee John D.
Redmond, Jr. Joseph C.
LandOfFree
Current control for an analog optical link does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Current control for an analog optical link, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Current control for an analog optical link will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1180156