A passive optical network (PON) fiber access system with two types of high spectral efficiency orthogonal frequency division multiple access (OFDMA) downlink signals is designed and demonstrated. In this scheme, 50Gbit/s 16/32 quadrature amplitude modulation (QAM) -OFDMA-PON downstream signals are transmitted over 20 km single-mode fiber (SMF) and detected using self mixing detection method, in which 256 subcarriers are divided into four sub-channels for multiple users access applications. The electrical frequency spectrums, optical spectrums, constellation diagrams, and bit error rate (BER) performance of the downstream signals are analyzed. The results show that under different received optical powers, we can select a certain sub-channel with the lowest BER, and the system also supports the dynamic selection of the appropriate signals type between 16QAM-OFDM and 32QAM-OFDM according to different users bandwidth requirements.
In this paper, a novel full duplex Radio Frequency Passive Optical Network (RPON) system by using 8-ary pulse amplitude modulation (8-PAM) downlink and duobinary (DB) uplink signals is designed. We measure optical spectrum diagrams, eye diagrams, bit error rate (BER), and analyze the reception performance of the 10Gbit/s system before and after transmission. Results show that the downlink 8-PAM and uplink DB signals can improve bandwidth efficiency. Hence, the scheme is expected to be applied in the future high-speed full duplex access system.
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