Rate adjustable differential phase shift key (DPSK) modulation

Details Rate adjustable differential phase shift key (DPSK) modulation Rate adjustable differential phase shift key (DPSK) modulation

2006-03-24

2010-10-19

Tran, Dzung D (Department: 2613)

Optical communications

Transmitter

Having particular modulation

C398S186000, C398S187000

Reexamination Certificate

active

07817924

ABSTRACT:
In a fixed delay optical communication system, rate adjustable differential phase shift key (DPSK) techniques eliminate the need for multiple comparing modules, each corresponding to a different data rate. Setting alternative data rates at integer multiples of the fundamental data rate of the optical communication system allows the system to process the respective integer number of symbols per period of the system, wherein the period of the system is the inverse of the fundamental data rate. Pulse carving techniques may be used to set the duty cycle of clock levels associated with a clock signal. The clock levels may be combined with respective symbols to provide optical symbols having a duty cycle less than 100%.

REFERENCES:
patent: 2003/0002121 (2003-01-01), Miyamoto et al.
patent: 2005/0111855 (2005-05-01), Bissessur
patent: 2006/0088321 (2006-04-01), Cheung et al.
patent: 2007/0058988 (2007-03-01), Yonenaga
patent: 2007/0116477 (2007-05-01), Oberland
J.R. Minch, et al., “Rate Adjustable NRZ-DPSK Modulation Scheme with a Fixed Interferometer”, IEEE LEOS Summer Topical Meeting 2005 (submitted Mar. 25, 2005 for peer review).
David Gervais, “Atmospheric Mitigation Techniques for Freespace Optical Communication”, Presented at Mitre Washington Tech Symposium, Apr. 13-14, 2005.
M.L. Stevens, et al., “A Novel Variable-Rate Pulse-Position Modulation System with Near Quantum Limited Performance”, IEEE 1999, pp. 301-302.
Eric A. Swanson, et al., “High Sensitivity Optically Preamplified Direct Detection DPSK Receiver with Active Delay-Line Stabilization”, IEEE Photonics Technology Letters, vol. 6, No. 2, Feb. 1994, pp. 263-265.
Peter J. Winzer, et al., “Return-to-Zero Modulator Using a Single NRZ Drive Signal and an Optical Delay Interferometer”, IEEE Photonics Technology Letters, vol. 13, No. 12, Dec. 2001, pp. 1298-1300.
D.O. Caplan, et al., “High-Sensitivity Variable-Rate Transmit/Receive Architecture”, IEEE 1999, pp. 297-298.
E. Ciaramella, et al., “A Novel Scheme to Detect Optical DPSK Signals”, IEEE Photonics Technology Letters, vol. 16, No. 9, Sep. 2004, pp. 2138-2140.
Fixed Differential Group Delay—PolaDelay™, Passive Polarization Components, General Photonics Corp., pp. 49.
A.H. Gnauck, et al., “Optical Phase-Shift-Keyed Transmission”, Journal of Lightwave Technology, vol. 23, No. 1, Jan. 2005, pp. 115-130.
A.H. Gnauck, et al., “Demonstration of 42.7-Gb/s DPSK Receiver With 45 Photons/Bit Sensitivity”, IEEE Photonics Technology Letters, vol. 15, No. 1, Jan. 2003, pp. 99-101.
Optical Transmission DPSK Demodulators, ITF Optical Technologies, Rev. May 1, 2005, 2 pages.
DPSK Decoder, Product Information Sheet, Little Optics, Inc. Rev. May 2004, 3 pages.
Xiang Liu, et al., “Athermal Optical Demodulator for OC-768 DPSK and RZ-DPSK Signals”, IEEE Photonics Technology Letters, vol. 17, No. 12, Dec. 2005, pp. 2610-2612.

Affiliated with

Also associated with

Rating

Rate adjustable differential phase shift key (DPSK) modulation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Rate adjustable differential phase shift key (DPSK) modulation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rate adjustable differential phase shift key (DPSK) modulation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4196407