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Optical Fiber Communication Conference

Non-Uniform Spectral Encoding of Measured Mode-Locked Laser Pulse for Enhanced Multi-User Performance in Optical CDMA Networks

Yixue Du, Sang-Hwa Yoo, Zhi Jun Ding

Published Mar 5, 2006• 0 citations
OpenAlex

Abstract

We propose a novel non-uniform spectral encoding scheme in a SPECTS O-CDMA system. Simulations incorporating measured mode-locked laser pulse spectrum indicate that enhanced BER performance and 8-fold increase in system capacity are possible.

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Limits to the encoding and bounds on the performance of coherent ultrashort light pulse code-division multiple-access

D. J. Hajela, Jawad A. Salehi

The authors obtain lower and upper bounds on the peak intensity of a spectrally phase encoded ultrashort light pulse as a function of the length of spectral phase encoding. It is shown that using random phase codes for spectral encoding of ultrashort light pulses in a coherent ultrashort light pulse code-division multiple-access (CDMA) system is almost optimal. Furthermore, simple upper bounds and an asymptotic approximation on the bit error rate (BER) for a wide class of ultrashort light pulse CDMA systems are obtained. It is shown that, in spite of being simple, these upper bounds can be used to evaluate the performance of a coherent ultrashort light pulse CDMA system.>

IEEE Transactions on Communications•Jan 1, 1992•21 citations
This paper presents a simple and effective security enhancement mechanism for spectral phase-encoded time spread (SPECTS) optical code-division multiple-access (O-CDMA) users against eavesdroppers tapping at the isolated single-user uplink stream. Traditional SPECTS O-CDMA users apply pseudorandom spectral phase codes to spread ON-OFF keyed ultrashort optical pulses in time. Isolated single-user upstream transmission is prone to energy detection by eavesdroppers, even those without code knowledge. In addition, it has been shown that the use of a pair of (bright/dark) codes to represent binary data transmission is still susceptible to differential phase shift keying (DPSK) eavesdroppers without code knowledge. To remedy this security weakness, we introduce a new type of O-CDMA data modulation with memory. This new method not only effectively defeats DPSK eavesdropping but also can provide good detection performance for authorized users. We successfully demonstrate the concealment of information from DPSK eavesdroppers with different levels of modulation information.
The authors obtain lower and upper bounds on the peak intensity of a spectrally phase encoded ultrashort light pulse as a function of the length of spectral phase encoding. It is shown that using random phase codes for spectral encoding of ultrashort light pulses in a coherent ultrashort light pulse code-division multiple-access (CDMA) system is almost optimal. Furthermore, simple upper bounds and an asymptotic approximation on the bit error rate (BER) for a wide class of ultrashort light pulse CDMA systems are obtained. It is shown that, in spite of being simple, these upper bounds can be used to evaluate the performance of a coherent ultrashort light pulse CDMA system.>