Optical communications – Transmitter – Having particular modulation
Reexamination Certificate
2004-12-17
2010-02-02
Sedighian, M. R. (Department: 2613)
Optical communications
Transmitter
Having particular modulation
C398S185000, C398S187000, C398S200000, C398S214000
Reexamination Certificate
active
07657189
ABSTRACT:
A system having a first optical modulator operates in a non-linear region thereof and fed by: an input radio frequency signal; and, a first optical frequency signal having a wavelength λ2. A second optical modulator operates in a linear region thereof and fed by: a fractional portion of the input radio frequency signal phase shifted relative to the input radio frequency signal by nπ radians where n is an odd integer; and a second different optical frequency signal wavelength λ1. A first photodiode is fed by an output of the first optical modulator. A second photodiode is fed by an output of the second optical modulator and a fractional portion of an output of the first optical modulator. An amplifier is fed by the second photodiode. A subtractor is fed by the amplifier and the first photodiode.
REFERENCES:
patent: 5214524 (1993-05-01), Shigematsu et al.
patent: 5699179 (1997-12-01), Gopalakrishnan
patent: 6175672 (2001-01-01), Newberg et al.
patent: 6215571 (2001-04-01), Yoshida
patent: 6266171 (2001-07-01), Gehlot
patent: 6490069 (2002-12-01), Kahn et al.
patent: 6819877 (2004-11-01), Carter et al.
patent: WO 02/25843 (2002-03-01), None
PCT/US2005/033568 International Search Report dated Jan. 17, 2006.
Frankart J.P., Boeckx, T., Gilliard J.M., Guevar D., Vion, E., Analog, Transmission of TV-Channels on Optical Fibers, with Non-Linearities Correction by Regulated Feedforward, Jan. 9, 1984, pp. 298-304, vol. 12, No. 9, Brussel, BE.
Govind P. Agrawal, Fiber-Optic Communication Systems, 1997, pp. 14-17, Second Edition, Canada.
H.S. Black, Stablized Feed-Back Amplifiers, Feb. 1999, pp. 379-385, vol. 87, No. 2.
Plextex Limited, Case Study RF Power Amplifier Design Feedforward Linearity Correction, pp. 1-2, Great Chesterford, Essex, United Kingdom, 1999.
Edward Ackerman and Charles Cox, Fiber-Optic Technology for Antenna Remoting, Jul. 9, 2001, pp. 1-14, Berkeley, California.
Daly, Crowley & Mofford & Durkee, LLP
Raytheon Company
Sedighian M. R.
LandOfFree
Optical link does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical link, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical link will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4204529