Optical communications – Transmitter – Including compensation
Reexamination Certificate
2008-05-13
2008-05-13
Li, Shi K. (Department: 2613)
Optical communications
Transmitter
Including compensation
Reexamination Certificate
active
07373089
ABSTRACT:
Methods and apparatus for providing improving optical signal transmission results over standard mode fiber using a combination of negative chirp, low extinction ratio, and self-phase modulation transmission techniques in combination are described. The use of pre-transmission signal distortion in combinations with one or more of the other transmission techniques is also described. Pre-transmission signal distortion may be introduced by controlling a modulator with a large symmetric AC signal which causes the modulator to operation in a non-linear region or, alternatively, by using a relatively small non-symmetric AC signal to drive the modulator. Use of the small non-symmetric signal has the advantage of reduced power requirements. The pre-transmission distortion acts to counter some of the distortion introduced by the transmission of the signal over an optic fiber.
REFERENCES:
patent: 2003/0147656 (2003-08-01), Yano
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Chand Naresh
Kojima Keisuke
Yu Jianjun
Li Shi K.
LSI Corporation
Straub Michael P.
Straub & Pokotylo
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