Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2007-05-29
2007-05-29
Singh, Dalzid (Department: 2613)
Optical communications
Multiplex
Wavelength division or frequency division
C398S084000, C398S102000, C398S082000
Reexamination Certificate
active
10253599
ABSTRACT:
A time-spreading and wavelength-hopping optical encoder spreads each pulse in a modulated optical pulse signal into a predetermined pulse train including pulses with different wavelengths. The last pulse in the pulse train is delayed from the first pulse in the pulse train by an interval that is longer than the pulse period of the modulated optical pulse signal. Interference is avoided by dividing the pulse train into successive delay groups that are equal in length to the pulse period of the modulated data pulse signal, and having each wavelength appear in only one delay group. If encoders producing differently structured pulse trains are used in an optical multiplexer, interference is avoided by having the same wavelength appear only at different positions within the delay groups of different pulse trains. Long delays can be used to multiplex a relatively large number of channels, even at high transmission rates.
REFERENCES:
patent: 5995255 (1999-11-01), Giles
patent: 2002/0012500 (2002-01-01), Paek
patent: 2003/0086647 (2003-05-01), Willner et al.
patent: 2004/0175188 (2004-09-01), Bellemare et al.
patent: 2000-209186 (2000-07-01), None
N. Wada et al., “Time-spread/wavelength-hop OCDM using fibre Bragg grating with supercontinuum light source,” 1999 IEICE Communication Society Conference, B-10-128, p. 305.
Lawrence R. Chen et al., “Wavelength-Encoding/Temporal-Spreading Optical code Division Multiple-Access System With In-Fiber Chirped Moiré Gratings”, Applied Optics, OSA, Optical Society of America, Washington, DC, US, vol. 38, No. 21, Jul. 20, 1999, pp. 4500-4508.
Wei Huang et al., “Coherent Optical CDMA (OCDMA) Systems Used for High-Capacity Optical Fiber Networks-System Description, OTDMA Comparison, and OCDMA/WDMA Networking”, Journal of Lightwave Technology, IEEE Service Center, New York, NY, US, vol. 18, No. 6, Jun. 2000, pp. 765-778.
Lawrence R. Chen et al., “Proof-of-Principle Demonstration of a Wavelength-Encoding/Time-Spreading Optical Code-Division Multiple Access System using In-Fiber Chirped Moiré Gratings”, Conference on Lasers and Electro-Optics, (CLEO 2000), Technical Digest, Postconference Edition, San Francisco, CA, May 7-12, 2000, Trends in Optics and Photonics (TOPS), New York, NY, IEEE, US, vol. 39, May 7, 2000. pp. 577-578.
L. Tan{hacek over (c)}evski et al., “Hybrid Wavelength Hopping/Time Spreading Schemes for Use in Massive Optical Networks With Increased Security”, Journal of Lightwave Technology, IEEE Service Center, New York, NY, US, vol. 17, No. 12, Dec. 1996, pp. 2636-2647.
OKI Electric Industry Co., Ltd.
Singh Dalzid
Wenderoth , Lind & Ponack, L.L.P.
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