Wavelength division multiplexing/code division multiple access h

Details Wavelength division multiplexing/code division multiple access h Wavelength division multiplexing/code division multiple access h

1997-03-27

2000-02-15

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359124, 359123, H04J 1408, H04J 1402

Patent

active

060259442

ABSTRACT:
The present invention is a wavelength division multiplexing (WDM)/code division multiple access (CDMA) hybrid code fiber optic communication device. It provides multiple, concurrent, asynchronous, bursty communication at up to full data rate at each port. The invention includes a novel physical channel scrambling technique which allows coders and decoders to conveniently select any encoded channel and increases the communications throughput. This hybrid approach combines WDM with a form of space/time division multiplexing (matrix codes) applied to each data bit so that up to P channels can be defined and simultaneously used without having the stringent hardware requirements for P different wavelengths or P different time slots. To alleviate cross-channel interference that can produce an error rate limitation in both optical matrix CDMA and WDM/CDMA Hybrid codes, a modification of this invention has been designed. This modification includes novel very high speed optical detection threshold determination which can cancel or discriminate part of the data dependent cross-channel interference.

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