Abstract
We demonstrate a cost- and spectrum-effective orthogonal frequency-division multiple access passive optical network downstream scheme based on multi-band and modified sub-Nyquist sampling over transmission reach of 20km. The sampling rate and bandwidth of ADC are reduced effectively, and double spectrum efficiency is obtained. The aggregate bit rate achieves 50.4 Gb/s. The influence of bit resolution of ADC/DAC is investigated and 8-bit resolution is regarded as a reasonable choice. The performance of receiver sensitivity and nonlinearity tolerance is studied. A 20km PON downstream transmission with splitter ratio of 1:64 is considered and the FEC limit of $3.8\times 10 ^{-3}$ is met. The research results show that the proposed scheme is suitable for the short reach communication systems and could be regarded as a promising candidate for the system beyond NG-PON2.
Highlights
The ever-growing bandwidth requirements of end-user applications services have put a lot of pressure on the access network bandwidth
We evaluate the performance of proposed orthogonal frequency-division multiplexing (OFDM) scheme by mean of the indicators like channel response, digital to analog converter (DAC)/analog-to-digital converter (ADC) resolution, SNR, receiver sensitivity, nonlinearity tolerance
The power fading caused by chromatic dispersion (CD) appears obviously in high frequency subbands
Summary
The ever-growing bandwidth requirements of end-user applications services have put a lot of pressure on the access network bandwidth. In order to solve the problem, passive optical network (PON), as a cost-effective solution to provide high-speed access, has gained extensive attention and been widely adopted [1]–[6]. The subcarriers are able to be assigned to any optical network unit (ONU) independently, so OFDM access (OFDMA) PON is a quite. We propose a scheme combining multi-band and modified sub-Nyquist sampling. The narrow baseband OFDM signals are moved to different frequency sub-bands by up-conversion at OLT, and are moved back to baseband by down-conversion at ONUs. The narrow baseband OFDM signals are moved to different frequency sub-bands by up-conversion at OLT, and are moved back to baseband by down-conversion at ONUs Both required sampling rate and bandwidth of ADC are able to be reduced.
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