Coherent light generators – Particular beam control device – Having particular beam control circuit component
Patent
1997-12-24
2000-08-08
Sanghavi, Hemang
Coherent light generators
Particular beam control device
Having particular beam control circuit component
372 32, 372 34, 372 38, 372 43, H01S 313
Patent
active
061012009
ABSTRACT:
An apparatus for simultaneously stabilising the output power and wavelength of a semiconductor laser is disclosed. A wavelength discriminating scheme is used to provide a wavelength error signal and an output power detection scheme is used to provide an output power level signal. The wavelength error signal is used to adjust the behaviour of a temperature sensor such that an automatic temperature control (ATC) module configured to maintain a pre-determined output from the temperature sensor, adjusts the actual laser temperature to minimize said signal. The output power level signal is directly delivered to an automatic power control (APC) module, which adjusts the drive current fed into the laser to minimize said signal using known control circuitry means. Adjusting the properties of the temperature sensor makes it possible for the apparatus to manipulate laser temperature and current to achieve simultaneous power, wavelength and temperature control, using the constant-temperature and constant-power external control modules used by semiconductor lasers that do not stabilize wavelength.
REFERENCES:
patent: 4815081 (1989-03-01), Mahlein et al.
patent: 4821273 (1989-04-01), Hori
patent: 5042042 (1991-08-01), Hori et al.
patent: 5193083 (1993-03-01), Yanagawa
patent: 5438579 (1995-08-01), Eda et al.
patent: 5602860 (1997-02-01), Masonson
patent: 5675597 (1997-10-01), Shighara
patent: 5825792 (1998-10-01), Villeneuve et al.
Patent Abstracts of Japan, vol. 096, No. 005, May 31, 1996 & JP 08 018145 A (Olympus Optical Co Ltd), Jan. 19, 1996 *Abstract*.
Patent Abstracts of Japan, vol. 018, No. 351 (C-1220), Jul. 4, 1994 & JP 06 090672 a (Kyowa Hakko Kogyo Co Ltd), Apr. 5, 1994 *Abstract*.
Patent Abstracts of Japan, VO. 096, No. 006, Jun. 2, 1996 & JP 08 037334 A (NEC Corp.), Feb. 6, 1996 *Abstract*.
Patent Abstracts of Japan vol. 017, No. 434(E-1412) Aug. 11, 1993 (Aug. 11, 1993) -& JP 05 090672 A (Shimadzu Corp). Apr. 9, 1993 (Apr. 9, 1993) Abstract.
Burbidge Douglas S.
Gariepy Daniel
Cushwa Benjamin H.
Nortel Networks Corporation
Sanghavi Hemang
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