Optical communications – Transmitter – Including compensation
Reexamination Certificate
2006-06-27
2006-06-27
Leung, Christina Y. (Department: 2633)
Optical communications
Transmitter
Including compensation
C398S154000, C398S159000
Reexamination Certificate
active
07068950
ABSTRACT:
A device and technique for aligning an optical carrier signal (e.g., a soliton pulse train) with a data signal in a transmitter. According to the invention, the device is configured to analyze the radio frequency (RF) spectrum of the transmitter's output. In one implementation, the device evaluates the amount of energy in a certain frequency band located near a selected null of the RF spectrum. In another implementation, the device examines the shape of the RF spectrum within that frequency band. In either case, based on the analysis, the device adjusts the phase of the clock signal driving an electro-optic (E/O) modulator in the transmitter. Such adjustment reduces misalignment between the optical carrier signal and data resulting, e.g., from thermal effects in the E/O modulator. The device may be used, e.g., in long-haul optical transmission systems operating at 10 GBit/s.
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Leung Christina Y.
Lucent Technologies - Inc.
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