Improvement of Received Optical Power Sensitivity in Asymmetric 2.5Gbps/1.2Gbps Passive Optical Network with Inverse Return to Zero(RZ) coded Downstream and NRZ upstream re-modulation

PARK SANGJO

Journal of The Korea Society of Computer and Information

Abbr : JKSCI
2010, 15(3), pp.65-72
Publisher : The Korean Society Of Computer And Information
Research Area : Computer Science

PARK SANGJO ¹

¹ 서원대학교

ABSTRACT

We propose the asymmetric 2.5Gbps/622Mbps PON(Passive Optical Network) in order to reduce the bandwith of filter at receiver with inverse RZ(Return to Zero) code coded downstream and NRZ(Non Return to Zero) upstream re-modulation. I theoretically analyze BER(Bit Error Rate) performance and the power sensitivity with the optimal threshold level by performing simulation with MATLAB according to the types of downstream data. The results have shown that the optimal threshold level at the optical receiver could be saturated at 0.33 as the optical received power increase more than -26dBm to keep of BER to a minimum. Also the power sensitivity is more improved by about 3dB by fixing the threshold level at 0.33 than the conventional receiver. The proposed system can be a useful technology for optical access networks with asymmetric upstream and downstream data rates because the optical receiver can be used without controlling threshold levels and that does not require a light source in optical network unit (ONU) and its control circuits in the optical line termination (OLT).
KEYWORDS

Optical subscriber network , Inverse Return-to-Zero code , Optical Network Unit , OLT , Optical Line Termination , Re-modulation , Asymmetric
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