Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1997-04-08
2000-09-19
Chan, Jason
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, 359187, H04B 1000, H04B 1004
Patent
active
06122085&
ABSTRACT:
A predistortion technique for adding a controlled amount of distortion to a radio-frequency (rf) drive signal of a laser in a lightwave transmitter. The magnitude of the added distortion approximates the distortion inherently produced by the laser. Additionally, the phase of the added distortion is substantially 180 degrees different from the distortion produced by the laser. Hence, the added distortion effectively cancels the distortion produced by the laser. The lightwave transmitter comprises a signal conditioner, a predistorter, a high-power rf amplifier circuit and a laser. The signal conditioner processes rf signals received from an rf input circuit. The processed rf signals are passed to the predistorter, which splits the rf signals into two portions. One of the split portions, which includes a major amount of the rf signal, passes through a delay circuit to an input of the combiner. The other split portion passes to diode circuits that selectively generate second- and third-order distortion products. A low-power rf amplifier circuit processes these second- and third-order distortion products before the signal combiner combines them with the main rf signal. The combined signals, which contain a controlled amount of distortion are amplified in the high-power amplifier to form the laser's rf drive signal.
REFERENCES:
patent: 5252930 (1993-10-01), Blauvelt
patent: 5321710 (1994-06-01), Cornish et al.
patent: 5424680 (1995-06-01), Nazarathy et al.
patent: 5481389 (1996-01-01), Pidgeon et al.
Chan Jason
Lucent Technologies - Inc.
Singh Dalzid
LandOfFree
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