역 RZ 부호로 코딩된 하향신호의 재변조를 이용한 광가입자망에서 상하향 데이터 속도 비율에 따른 최적 임계치의 설정을 위한 성능 분석
Performance Analysis for Optimizing Threshold Level Control of a Receiver in Optical Subscriber Network with Inverse Return to Zero (RZ) Coded Downstream and NRZ Upstream Re-modulation According to Upstream Bit Rates
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초록
역 RZ 부호로 코딩된 하향신호의 재변조를 이용한 광가입자망에서 상향과 하향 데이터 속도비가 1:2, 1:4, 1:8, 1:16인4가지 형태에 따른 최적 임계치의 설정을 위한 성능 분석을 위하여 하향 데이터의 형태에 따른 재변조한 상향신호의 평균오차율을 이론적으로 분석하고 매트랩을 이용한 시뮬레이션에서 얻어진 수치 결과를 분석한다. 4가지 상향 데이터에 대하여 광수신기의 최적 임계치는 평균 수신전력이 증가하면 1/3로 수렴하고 1/3로 설정된 임계치는 최적 임계치에 설정한 경우와 비교하면 평균 오차율이 거의 열화되지 않는 것을 알 수 있다. 그리고 평균 수신전력이 -28 dBm이상인 경우 임계치를 1/3로고정하여 설정하면 임계치가 1/2인 종래의 수신방식보다 평균 오차율에 대한 평균 수신전력이 2dB~3dB 개선되는 것을 알수 있다. 역 RZ 부호로 코딩된 하향신호의 재변조방식은 상향과 하향 데이터 속도비와 관계없이 광수신기의 임계치를 1/3로설정하면 종래의 수신기를 적용한 경우와 비교하여 전송능력을 향상시킬 수 있어 광가입자 망에 적용할 경우 광가입자의 수를 증가시킬 수 있는 유용한 방식임을 알 수 있다.
Abstract
We theoretically analyze the BER (Bit Error Rate) performance by modeling the occurrence of BER in order to increase performance by optimizing the threshold level of a receiver in asynchronous 10 Gbps/622 Mbps, 1.25 Gbps, 2.5 Gbps, 5Gbps optical subscriber network with inverse RZ (Return to Zero) coded downstream and NRZ (Non Return to Zero)downstream re-modulation and it is performed by simulation with MATLAB according to the types of downstream data for four models of which the downstream to upstream data ratios are 1:2, 1:4, 1:8 and 1:16. The results have shown that the normalized threshold level in an optical receiver could be saturated at 1/3 as the average received optical power increase and the BER using the fixed threshold level at 1/3 is not deteriorated compared with using the optimal threshold level. As the average received optical power increases than -28 dBm, the average received optical powers for obtaining the same BER can be reduced by 2 dB~3 dB than using the conventional receiver with threshold level of 0.5. The asynchronous 10 Gbps/622Mbps, 1.25 Gbps, 2.5 Gbps, 5 Gbps optical subscriber network with inverse RZ (Return to Zero) coded downstream and NRZ (Non Return to Zero) downstream re-modulation can be a useful technology for asynchronous optical access networks because the improved minimum receiving power could increases the number of subscribers.
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