Frequency locking of multisection laser diodes

Details Frequency locking of multisection laser diodes Frequency locking of multisection laser diodes

2002-08-12

2008-03-04

Harvey, Minsun Oh (Department: 2828)

Coherent light generators

Particular beam control device

Optical output stabilization

C372S023000, C372S038010

Reexamination Certificate

active

07339962

ABSTRACT:
A multi-section laser diode control system comprising a multi-section laser diode (10), microprocessor controller (24), digital-to-analogue converter (28), driver circuit (30) and wavelength locker (14) is modified by inclusion of a locking circuit (40) which generates an analogue correction signal . . . 1 V ph responsive to measurements of the laser output made by the wavelength locker. The analogue correction signal is added to the preset phase voltage V ph asserted by the microprocessor controller to provide fast feedback that bypasses the microprocessor controller. This novel feedback is made possible by avoiding the use of the standard prior art control algorithm which requires a division calculation to be performed. Instead, novel control algorithms based purely on additions, subtractions and multiplications are used. The laser can thus be locked to its target output frequency without having to place slow analogue-to-digital and digital-to-analogue converters in the feedback control path.

REFERENCES:
patent: 2001/0017876 (2001-08-01), Kner et al.
patent: 2002/0181521 (2002-12-01), Crowder et al.
patent: WO 00/49693 (2000-08-01), None
patent: WO 01/03262 (2001-01-01), None
Sarlet, G. et al., “Control of Widely Tunable SSG-DBR Lasers For Dense Wavelength Division Multiplexing”, Journal of Lightwave Technology, IEEE. New York, US. vol. 18, No. 8, Aug. 2000.

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