Threshold Level Setting of a Receiver in Optical Subscriber Network with Manchester Coded Downstream and NRZ Upstream Re-modulation for the Improvement of Upstream Data Ratios

PARK SANGJO

Journal of The Korea Society of Computer and Information

Abbr : JKSCI
2011, 16(12), pp.175-186
Publisher : The Korean Society Of Computer And Information
Research Area : Computer Science

PARK SANGJO ¹

¹서원대학교

ABSTRACT

The threshold level of a receiver is analyzed for the simplification of system and the improvement of upstream data ratios in optical subscriber network of which the upstream date rate and the optical transmitted power are changed to meet the requested BER (Bit Error Rate) defined per interactive multimedia services. In asynchronous optical subscriber network of which the upstream to downstream data ratios are 1:1/2, 1:1/4, 1:1/8 and 1:1/16 with manchester coded downstream and NRZ (Non Return to Zero) downstream re-modulation, the BER performance is theoretically analyzed and it is performed by simulation with MATLAB according to the four types of downstream data for four models. The results have shown that in the cases which the upstream to downstream data ratios are 1:1/4, 1:1/8 and 1:1/16 the conventional receiver with threshold level of 1/2 can be applied regardless of average received optical powers and the BER is not much deteriorated compared with using the optimal threshold level. In the case that the upstream to downstream data ratio is 1:1/2 the threshold level in an optical receiver could be fixed at 1/3 and the BER is not much deteriorated compared with using the optimal threshold level as the average received optical power increases.
KEYWORDS

Optical subscriber network, Manchester code, ONU(Optical Network Unit), OLT(Optical Line Termination), Re-modulation
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