Author_Institution :
Electr. Eng. Dept., Sharif Univ. of Technol., Tehran, Iran
Abstract :
In this paper, we study three types of jammers, namely, pulse-jammer, partial-band jammer, and follower-jammer, in a typical fiber-optic-based spectrally phase-encoded optical code division multiple-access (SPE-OCDMA) system. We analyze, mathematically, the effects of the aforementioned jammers on the performance of an SPE-OCDMA system for two scenarios, namely, ideal noiseless channel with an ideal optimum receiver and an ultrahigh-speed nonlinear receiver based on two-photon-absorption (TPA) in a noisy channel. Also, for each of the above cases, two types of modulation, namely, on-off keying (OOK) and two-code keying (2CK) are investigated and their system performances are compared. It is shown that under certain conditions, the system performance can be dramatically degraded due to the jamming signals; also, systems using 2CK modulation show a better resistance and performance when compared to systems using OOK modulation.
Keywords :
amplitude shift keying; code division multiple access; code division multiplexing; jamming; nonlinear optics; optical fibre communication; optical receivers; two-photon processes; OCDMA; ON-OFF keying; follower-jammer; ideal noiseless channel; ideal optimum receiver; jamming resistance; nonlinear two-photon absorption; optical code division multiple-access system; partial-band jammer; pulse-jammer; spectral phase encoding; two-code keying; ultrahigh-speed nonlinear receiver; Jammer; on–off keying modulation; optical code division multiple access; resistance capabilities; spectrally phase encoded; two-code keying modulation; two-photon-absorption;
