Patent
Wavelength division multiplexing/code division multiple access hybrid
Antonio J. Mendez,Charles A. Finnila,Robert M. Gagliardi +2 more
- 27 Mar 1997
68
TL;DR: In this article, the authors proposed a hybrid WDM/CDMA hybrid code fiber optic communication device, which 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.
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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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Citations
High-performance optical CDMA system based on 2-D optical orthogonal codes
TL;DR: This research shows that OCDMA implementation complexity can be avoided by using a guard time in the codes and an optical hard limiter in the receiver, and that 2-D wavelength/time codes have better SE than one-dimensional CDMA/WDM combinations.
75
Patent
Wavelength selective optical add/drop multiplexer and method of manufacture
Alan Braun,Joseph H. Abeles,Robert Amantea +2 more
- 02 Aug 2001
TL;DR: In this paper, the authors present an exemplary wavelength selective optical coupling device, which includes two waveguides, a ring or disc resonator, and resonator coupling elements, including a bridge coupled to the top surface of the substrate and electrically coupled to control circuitry within the substrate.
65
Patent
Method and apparatus for non-linear code-division multiple access technology
Alfred Keng Tiong Tan
- 05 Oct 2001
TL;DR: Go-CDMA as mentioned in this paper is a class of n x l nonlinear block codes, which are constructed using column-reduced and row reduced Hadamard orthogonal matrices.
65
Patent
Optical routing using a star switching fabric
Mohammed N. Islam
- 02 Sep 2003
TL;DR: In this paper, a router includes a plurality of line cards each operable to receive at least one packet comprising an identifier associated with a destination element external to the router, each line card includes a look-up table that facilitates routing the received packet toward the destination element based at least in part on the identifier.
63
Patent
Dynamically reconfigurable composite grating filters for temporal waveform processing
Alan E. Johnson,Eric S. Maniloff,Michael Munroe,Anders Grunnet-Jepsen,John N. Sweetser +4 more
- 26 Jan 2000
TL;DR: In this paper, programmable waveguide coders are described that include one or more corrugation segments (609) and spacer segments (613) formed on or in a waveguide defined by a core and are independently controllable with voltages applied to each segment's electrodes.
47
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