Optical communications – Transmitter – Including compensation
Reexamination Certificate
2005-08-16
2005-08-16
Chan, Jason (Department: 2633)
Optical communications
Transmitter
Including compensation
C398S197000
Reexamination Certificate
active
06931214
ABSTRACT:
Methods and apparatus related to maintaining a pre-determined ratio of a pilot tone power and a total mean optical power of an optical signal are provided. One method includes the steps of detecting the AC and DC components of an optical signal having a pilot tone signal. An amplitude of the pilot tone signal is varied in accordance with a difference between a pre-determined value and a ratio of the AC and DC components. Another method includes the step of generating an optical signal in accordance with a DC bias and an AC bias corresponding to a pilot tone signal. The AC and DC components of the optical signal are detected. At least one of the DC bias and the AC bias is varied in accordance with a difference between a pre-determined value and a ratio of the AC and DC components. An apparatus includes an optical source providing an optical signal in response to a DC bias and an AC bias corresponding to a pilot tone signal. The apparatus includes detectors coupled to measure the AC and DC components of the optical signal. A feedback control varies at least one of the DC bias and the AC bias in accordance with a difference between a pre-determined value and a ratio of the AC and DC components. In various embodiments, the DC bias only, the AC bias only, or both the AC bias and the DC bias are varied.
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Brorson Stuart D.
Carrick John C.
Frankfort Eric J.
Holmstrom Roger P.
Talmadge Paul C.
Chan Jason
Davis William D.
Davis & Associates
Li Shi K.
Tellabs Operations Inc.
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