Coherent light generators – Particular component circuitry – Optical pumping
Patent
1996-05-31
1998-03-24
Bovernick, Rodney B.
Coherent light generators
Particular component circuitry
Optical pumping
H01S 300
Patent
active
057320969
ABSTRACT:
The control circuit for supplying a driving current to a laser diode makes it possible to keep the laser driving current variable in a wide range. The control circuit includes a laser diode, a photo diode for receiving a part of an optical output emitted from the laser diode and outputting an electrical signal corresponding to a level of the optical output, a first current supplying circuit for supplying a bias current to the laser diode, a first monitor circuit for monitoring a size of a signal driving current supplied by the first current supplying circuit, a second monitor circuit for monitoring a size of the bias current supplied by the second current supplying circuit, a first feed-back loop for controlling the signal driving current supplied from the first current supplying circuit by the output of the first monitor circuit, as a reference of the electric signal outputted from the photo diode corresponding to the level of the optical output emitted from the laser diode, a second feed-back loop for controlling the bias current supplied from the second current supplying circuit by the output of the second monitor circuit, as said reference of the signal outputted from the photo diode corresponding to the level of the optical output emitted form the laser diode; and an adder circuit for adding an offset current of the signal driving current supplied from the first current supplying circuit on the outside of the first feed-back loop.
REFERENCES:
patent: 5253267 (1993-10-01), Johnson
patent: 5394416 (1995-02-01), Ries
patent: 5408485 (1995-04-01), Ries
Kuzukami Hiroshi
Miyaki Yuji
Ohkuma Yoshinori
Suzuki Kazuhiro
Yasuda Akihiko
Bovernick Rodney B.
Fujitsu Limited
Wise Robert E.
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