Optical communications – Transmitter and receiver system – Including electrical oscillator
Reexamination Certificate
2005-02-01
2005-02-01
Phan, Hanh (Department: 2633)
Optical communications
Transmitter and receiver system
Including electrical oscillator
C398S091000, C398S098000, C398S140000, C398S141000, C398S115000, C398S187000, C398S185000, C398S186000, C398S202000, C398S204000, C398S205000, C455S166200, C455S166200, C455S166200, C455S166200, C455S166200, C455S166200, C455S166200, C370S902000, C370S902000, C370S902000
Reexamination Certificate
active
06850710
ABSTRACT:
A method and apparatus are provided for transmitting and receiving multiple RF/microwave subcarriers on a single optical wavelength over an optical link. The method includes the steps of modulating a plurality of RF/microwave subcarrier frequencies with a respective communication signal and modulating an optical carrier wave with the plurality of modulated RF/microwave subcarrier frequencies. The method further includes the steps of detecting the plurality of RF/microwave subcarriers of the optical carrier wave and mixing those subcarriers with a first local oscillator (LO) frequency to create a new heterodyne IF frequency above the highest frequency component of the modulated signal spectrum of the detected subcarriers, filtering an RF/microwave subcarrier frequency of the plurality of detected RF/microwave subcarriers utilizing a bandpass filter at an IF center frequency of the new IF frequency and mixing the filtered RF/microwave subcarrier with a second local oscillator (LO) frequency to derive a difference frequency at a desired center frequency for propagation over the subsequent network element.
REFERENCES:
patent: 4596052 (1986-06-01), Wright et al.
patent: 4953156 (1990-08-01), Olshansky et al.
patent: 5016242 (1991-05-01), Tang
patent: 5023946 (1991-06-01), Yamazaki et al.
patent: 5029306 (1991-07-01), Bull et al.
patent: 5052051 (1991-09-01), Naito et al.
patent: 5134509 (1992-07-01), Olshansky et al.
patent: 5142402 (1992-08-01), Tsushima et al.
patent: 5170275 (1992-12-01), Large
patent: 5305134 (1994-04-01), Tsushima et al.
patent: 5323258 (1994-06-01), Tsushima et al.
patent: 5339184 (1994-08-01), Tang
patent: 5500758 (1996-03-01), Thompson et al.
patent: 5526158 (1996-06-01), Lembo
patent: 5589970 (1996-12-01), Lyu et al.
patent: 5596436 (1997-01-01), Sargis et al.
patent: 5680238 (1997-10-01), Masuda
patent: 5701186 (1997-12-01), Huber
patent: 5896211 (1999-04-01), Watanabe
patent: 5940196 (1999-08-01), Pichler et al.
patent: 6115162 (2000-09-01), Graves et al.
Phan Hanh
Stefaniw Eliza
TIP Group, LLC
LandOfFree
Method and apparatus of utilizing RF/microwave and optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus of utilizing RF/microwave and optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus of utilizing RF/microwave and optical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3474931