Coherent light generators – Particular component circuitry – Having noise suppression circuitry
Reexamination Certificate
2005-05-10
2005-05-10
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular component circuitry
Having noise suppression circuitry
C372S038020
Reexamination Certificate
active
06891868
ABSTRACT:
In order to provide a low noise laser beam, a noise reducing feedback network is provided which creates a noise reducing signal and provides that signal to the laser itself. In order to produce the noise reducing signal, the operation of the laser is monitored and the feedback signal is a direct result of this monitoring. Monitoring is accomplished by a fast-forward sense detector, which receives a portion of the laser beam from the operating laser. The output from this fast-forward sense detector is provided to an amplifier which inverts and amplifies the signal. A noise reduction feedback network then receives the amplified signal, appropriately filters this signal, and provides it to the laser itself so as to reduce noise in the laser-beam for the frequency band of importance for reading the recorded data from the optical medium. The noise reduction feedback signal further has sufficiently high impedance so as to not disturb the traditional CW operation of the laser and to avoid interference with the traditional RF modulation of the laser.
REFERENCES:
patent: 4114180 (1978-09-01), Kayanuma
patent: 4150402 (1979-04-01), Tietze et al.
patent: 4863272 (1989-09-01), Coccoli
patent: 5250796 (1993-10-01), Taguchi et al.
patent: 5253267 (1993-10-01), Johnson
patent: 5303250 (1994-04-01), Masuda et al.
patent: 5307337 (1994-04-01), Woloszczuk
patent: 5309461 (1994-05-01), Call et al.
patent: 5313448 (1994-05-01), Sukeda et al.
patent: 5329395 (1994-07-01), Endo et al.
patent: 5363363 (1994-11-01), Gage
patent: 5471449 (1995-11-01), Kaneko et al.
patent: 5475210 (1995-12-01), Taguchi et al.
patent: 5506716 (1996-04-01), Mihara et al.
patent: 5598264 (1997-01-01), Failes
patent: 5602806 (1997-02-01), Arnett et al.
patent: 5675568 (1997-10-01), Hajjar et al.
patent: 5687261 (1997-11-01), Logan
patent: 5723856 (1998-03-01), Yao et al.
patent: 5726965 (1998-03-01), Hajjar et al.
patent: 5798854 (1998-08-01), Blauvelt
patent: 5825793 (1998-10-01), Miyai et al.
patent: 5848044 (1998-12-01), Taguchi et al.
patent: 5886802 (1999-03-01), Majima
patent: 5898656 (1999-04-01), Takiguchi
patent: 6026071 (2000-02-01), Kimura
patent: 6167066 (2000-12-01), Gaeta et al.
patent: 6222861 (2001-04-01), Kuo et al.
patent: 6233045 (2001-05-01), Suni et al.
patent: 6304200 (2001-10-01), Masuda
patent: 6501773 (2002-12-01), Volz et al.
patent: 56145534 (1981-12-01), None
patent: 58196630 (1983-11-01), None
patent: 63084178 (1988-04-01), None
Brooke Jeffrey M.
Kline Gary L.
Verboom Johannes J.
Harvey Minsun Oh
Lervick Craig J.
Nguyen Tuan N.
Oppenheimer Wolff & Donnelly LLP
Plasmon LMS Inc.
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