Full-Optical TOAD based Walsh-Hadamard code generation

Full-Optical TOAD based Walsh-Hadamard code generation Transmission of information takes place simultaneously over the same available channel bandwidth in Code Division Multiple Access (CDMA) technique. The spread spectrum (SS) technique is used in CDMA systems for transmission of information by employing spreading codes. A unique spreading code, acts as a signature code, is assigned for each individual user. The signal occupies a bandwidth much larger than the minimum necessary to send the information in SS modulation technique. A synchronized reception with the code at the receiver is applied for dispreading the information before the data recovery. From a long-term, Walsh-Hadamard codes have been employed as spread spectrum codes in CDMA communications due to their ease of generation. Walsh-Hadamard codes are absolutely orthogonal binary user codes which have so many favourite applications in synchronous multicarrier communications. However, the optical application of Walsh-Hadamard codes turns important for optical CDMA to solve the above problem. For this, the designs need the use of nonlinear optics capable of controlling multi-valued signals. To achieve this goal all-optical terahertz optical asymmetric Demultiplexer based design of Walsh-Hadamard codes is explored in this paper. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Optical and Quantum Electronics Springer Journals

Full-Optical TOAD based Walsh-Hadamard code generation

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Physics; Optics, Lasers, Photonics, Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks
ISSN
0306-8919
eISSN
1572-817X
D.O.I.
10.1007/s11082-017-1130-4
Publisher site
See Article on Publisher Site

Abstract

Transmission of information takes place simultaneously over the same available channel bandwidth in Code Division Multiple Access (CDMA) technique. The spread spectrum (SS) technique is used in CDMA systems for transmission of information by employing spreading codes. A unique spreading code, acts as a signature code, is assigned for each individual user. The signal occupies a bandwidth much larger than the minimum necessary to send the information in SS modulation technique. A synchronized reception with the code at the receiver is applied for dispreading the information before the data recovery. From a long-term, Walsh-Hadamard codes have been employed as spread spectrum codes in CDMA communications due to their ease of generation. Walsh-Hadamard codes are absolutely orthogonal binary user codes which have so many favourite applications in synchronous multicarrier communications. However, the optical application of Walsh-Hadamard codes turns important for optical CDMA to solve the above problem. For this, the designs need the use of nonlinear optics capable of controlling multi-valued signals. To achieve this goal all-optical terahertz optical asymmetric Demultiplexer based design of Walsh-Hadamard codes is explored in this paper.

Journal

Optical and Quantum ElectronicsSpringer Journals

Published: Aug 9, 2017

References

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