Optical communications – Transmitter – Including compensation
Reexamination Certificate
2011-04-12
2011-04-12
Phan, Hanh (Department: 2613)
Optical communications
Transmitter
Including compensation
C398S194000, C398S159000, C327S318000, C327S317000, C327S362000
Reexamination Certificate
active
07925170
ABSTRACT:
A predistortion circuit provides a predistorted input signal that compensates for distortion generated by a non-linear amplifier such as a laser device. The predistortion circuit may be used in an optical transmitter designed for broadband applications, such as a laser transmitter used for forward path CATV applications. The predistortion circuit may include a primary signal path and a secondary signal path that receive an input signal. A second order distortion generator on the secondary signal path generates predistortion of a magnitude corresponding to the magnitude of, but at an opposite phase to, the distortion generated by the non-linear amplifier. The second order distortion generator includes diodes with an adjustable diode bias to control phase, magnitude and/or magnitude/phase versus frequency of the predistortion.
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Applied Optoelectronics, Inc.
Grossman Tucker Perreault & Pfleger PLLC
Kinsella Norman S.
Phan Hanh
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