Abstract

We propose the performance enhancing method optimization of an asynchronous 2.5 Gbps/1.25 Gbps optical subscriber network with inverse RZ (Return to Zero) coded downstream and NRZ (Non Return to Zero) upstream re-modulation by adjusting threshold level control of a receiver. We theoretically analyze the BER (Bit Error Rate) performance by modeling the occurrence of BER by simulation with MATLAB according to the types of downstream data. The results have shown that the normalized threshold level in an optical receiver could be saturated at 1/3 as the SNR (Signal to Noise Ratio) increases. The needed SNR for obtaining the BER <TEX>$10^{-9}$</TEX> can be reduced by <TEX>$\sim$</TEX>5 dB by optimizing the normalized threshold level at 1/3 instead of by using the conventional receiver with threshold level of 0.5. The proposed system can be a useful technology for asynchronous optical access networks with asymmetric upstream and downstream data rates, because the improved minimum receiving power could replace a light source with a source with lower power and lower cost in an OLT (Optical Line Termination).

© 2009 Optical Society of Korea

Wavelength remodulation scheme using DPSK downstream and upstream for DWDM-PONs

Nebras Deb and Hanan Anis
Opt. Express 19(17) 16418-16422 (2011)

An experimental demonstration for carrier reused bidirectional PON system with adaptive modulation DDO-OFDM downstream and QPSK upstream signals

Jhih-Heng Yan, You-Wei Chen, Kuan-Heng Shen, and Kai-Ming Feng
Opt. Express 21(23) 28154-28166 (2013)

Performance Analysis of Heterogeneous Optical CDMA Networks With Bursty Traffic and Variable Power Control

Yanhua Deng and Paul R. Prucnal
J. Opt. Commun. Netw. 3(6) 487-492 (2011)

Injection-locking laser-diode-based OC-192 optical non-return-to-zero-to-return-to-zero OR logic gate

Yung-Cheng Chang and Gong-Ru Lin
Opt. Lett. 30(16) 2074-2076 (2005)

Extended-reach access network with downstream radio-over-fiber (ROF) signal and upstream NRZ signal using orthogonal-WDM

C. W. Chow, S. P. Huang, L. G. Yang, and C. H. Yeh
Opt. Express 20(15) 16757-16762 (2012)