Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2007-08-01
2010-02-09
Petkovsek, Daniel (Department: 2874)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C398S116000, C398S141000, C398S150000, C385S001000, C385S002000
Reexamination Certificate
active
07660491
ABSTRACT:
A cw-laser source transmits low-noise, narrow-linewidth optical power via an optical fiber to a bias-free electro-optic phase modulator at a remote site, where an antenna or an RF sensor is located. The RF electrical signal modulates the phase modulator at the remote site, converting an electrical signal into an optical signal. The phase-modulated optical signal is fed back via the optical fiber to an optical filter whose filter transfer characteristics can be tuned and reconfigured to cancel the intermodulation distortion terms, particularly the dominant 3rdorder intermodulation, as well as the 2ndorder. The filtered optical signal is converted to the RF signal at the photodetector. The optical filter is used to effectively “linearize” the signal at the receiver end, rather than at the modulator end.
REFERENCES:
patent: 6115162 (2000-09-01), Graves et al.
patent: 6643417 (2003-11-01), Strutz et al.
patent: 6996345 (2006-02-01), Chen
patent: 2003/0030868 (2003-02-01), Sasai et al.
Creighton Wray James
EOSpace, Inc.
Narasimhan Meera P.
Petkovsek Daniel
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