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首页> 外文期刊>Journal of Lightwave Technology >Performance Analysis of Spectral-Phase-Encoded Optical CDMA System Using Two-Photon-Absorption Receiver Structure for Asynchronous and Slot-Level Synchronous Transmitters
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Performance Analysis of Spectral-Phase-Encoded Optical CDMA System Using Two-Photon-Absorption Receiver Structure for Asynchronous and Slot-Level Synchronous Transmitters

机译:使用双光子吸收接收器结构的相位和相位同步发射器的频谱编码光CDMA系统的性能分析

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摘要

In this paper, we analyze the performance of a nonlinear two-photon-absorption (TPA) receiver and compare its performance with that of a single-photon-absorption (SPA) receiver in the context of spectral-phase-encoded optical code-division multiple access (CDMA) technique. The performances for the above systems are evaluated for two different transmission scenarios, namely, asynchronous and slot-level synchronous transmitters. Performance evaluation includes different sources of degradation such as multiple-access interference, noise due to optical amplification, shot noise, and thermal noise. In obtaining the performance, the mean and variance of the received signal in each of the above techniques are derived, and bit error rate is obtained using Gaussian approximation. In general, it is shown that TPA receivers are superior in performance with respect to SPA receivers when the receiver employs a much slower photodetector in comparison with the laser''s transmitted pulse duration. This, indeed, is the reason behind the choice of nonlinear receivers, such as TPA, in most spectral-phase-encoded optical CDMA systems.
机译:在本文中,我们分析了非线性双光子吸收(TPA)接收器的性能,并在频谱相位编码的光学码分的情况下将其性能与单光子吸收(SPA)接收器进行了比较。多址(CDMA)技术。针对两种不同的传输方案,即异步和时隙级同步发射机,评估了上述系统的性能。性能评估包括不同的降级源,例如多址干扰,由于光放大而引起的噪声,散粒噪声和热噪声。在获得性能时,得出上述每种技术中接收信号的均值和方差,并使用高斯近似获得误码率。总的来说,当与激光发射脉冲持续时间相比,TPA接收器使用的光检测器慢得多时,TPA接收器的性能要优于SPA接收器。实际上,这就是在大多数频谱相位编码的光学CDMA系统中选择诸如TPA之类的非线性接收器的原因。

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