Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2007-03-27
2007-03-27
Schwartz, Jordan (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S245000, C398S155000
Reexamination Certificate
active
11208571
ABSTRACT:
An apparatus for simultaneous OTDM demultiplexing, electrical clock recovery and optical clock generation, and optical clock recovery using a traveling-wave electroabsorption modulator. The apparatus includes a TW-EAM and a PLL coupled thereto. The TW-EAM includes a first, a second, a third, and a fourth. The first port is used for an optical input and the third port is used for optical output. The second port is coupled to an input, and the fourth port is coupled to an output, of the PLL. When the first port receives optical input, the second port produces a photocurrent to be applied to the PLL, and the fourth port receives a recovered clock produced by the PLL, and the third port produces demultiplexed data and an optical clock. Using the same configuration, the apparatus produces a recovered optical clock signal.
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B. Mikkelsen, et al., “160 Gb/s TDM Transmission Systems”, pp. 125-127, ECOC 2000.
Jianjun Yu, et al. “Simultaneous Demultiplexing and Clock Recovery of 80 Gb/s OTDM Signals Using a Tandem Electro-absorption Modulator”, 2001 IEEE, pp. 358-359.
Blumenthal Daniel J.
Bowers John E.
Chou Hsu-Feng
Hu Zhaoyang
Inohara Ryo
KDDI R&D Laboratories Inc.
Schwartz Jordan
Stultz Jessica
The Regents of the University of California
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