Methods and apparatus for optical pulse generator with...

Details Methods and apparatus for optical pulse generator with... Methods and apparatus for optical pulse generator with...

2006-04-11

2006-04-11

Palmer, Phan T. H. (Department: 2874)

Optical waveguides

Temporal optical modulation within an optical waveguide

Electro-optic

C385S001000, C385S004000, C359S279000, C398S189000

Reexamination Certificate

active

07027669

ABSTRACT:
Systems and techniques for generating optical pulses exhibiting a progressive phase shift, and the use of those pulses to transmit data, are described. One embodiment of the invention employs a Mach-Zehnder modulator using electrical signals chosen to introduce a predetermined frequency shift at the center of each pulse generated by the pulse generator. This frequency shift is achieved by introducing a timing difference between the electrical input signals. Another embodiment of the invention employs a chirp free pulse generator and a separate phase modulator to induce the desired frequency or phase shift. These progressively phase shifted pulses may be further modulated to transmit data by introducing phase or amplitude modulation on the optical pulses, depending on the data to be transmitted.

REFERENCES:
patent: 6760142 (2004-07-01), Leuthold et al.
Hodzic et al., Alternative Modulation Formats in N×40 Gb/s WDM Standard Fiber RZ-Transmission Systems, Journal of Lightwave Technology, Apr. 2002, Page(s) 598-607, vol. 20, No. 4.
Idler et al., Vestigial Side Band Demultiplexing for Ultra High Capacity (0.64 bit/s/Hz) Transmission of 128×40 Gb/s Channels, Proc. Optical Fiber Communications Conference (OFC '01), paper MM3, 2001.
Veselka et al., Pulse Generaltion for Soliton Systems Using Lithium Niobate Modulators, IEEE Journal of Selected Topics in Quantum Electronics, Jun. 1996, Pages(s) 300-310, vol. 2, No. 2.

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