Data processing: generic control systems or specific application – Specific application – apparatus or process – Product assembly or manufacturing
Reexamination Certificate
2006-02-14
2006-02-14
Paladini, Albert W. (Department: 2125)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Product assembly or manufacturing
C250S205000
Reexamination Certificate
active
06999838
ABSTRACT:
A system and method of stabilizing laser output levels includes a laser (10), an injection circuit for injecting a radio frequency waveform, and a control circuit for energizing and stabilizing the laser. The radio frequency waveform injected by the injection circuit has a high duty cycle to maintain high output power while providing a stable multimode spectrum. A back facet photodiode sensor (102) detects radiation emitted from a back facet semiconductor laser (101) and provides a feedback signal to the control circuit (41) for maintaining the laser output power. The response of the photodiode is not fast enough to track intensity variations due to the RF waveform, and thus provides feedback to the control circuit (41) only when there is a substantial need to adjust laser power.
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Markis William R.
Roddy James E.
Eastman Kodak Company
Nelson Adrian Blish
Paladini Albert W.
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