Optical signal converter, optical encoder, optical decoder,...

Details Optical signal converter, optical encoder, optical decoder,... Optical signal converter, optical encoder, optical decoder,...

2007-02-06

2007-02-06

Payne, David C. (Department: 2613)

Optical communications

Multiplex

Code division multiplexing

C398S189000, C398S190000

Reexamination Certificate

active

10716709

ABSTRACT:
An optical signal encoder/decoder includes a grating waveguide having an identical number of uniform pitch gratings to the number of code chips of a binary phase optical code, the uniform pitch gratings being formed in a waveguide direction to reflect light of a predetermined wavelength. Here, adjacent gratings corresponding to a position at which the optical code value changes are disposed a spacing apart from each other to give a phase shift of (2m+1)π/2 to the light, and the remaining adjacent gratings are disposed a spacing apart from each other to give a phase shift of nπ to the light (m, n: integer).

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Yusuke Nasu et al., “Multiple-phase-shift superstructure fiber Bragg gratings (MPS-SSFBG's) for dense WDM systems”, Presented at OECC/IOOC2001, pp. 34-35.
Peh Chiong The et al., “8-channel Bi-directional Spectrally Interleaved OCDMA/DWDM experiment employing 16-chip, four-level phase coding gratings”, Technical Digest, Jul. 2002, pp. 384-385.
Dr. H. Fathallah, Optical CDMA: Extending the Life of Optical Networks, APN, Inc.

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