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Real-time digital service and multimedia service upstream transmission in Digital Signal Processing(DSP)-based Orthogonal Frequency Division Multiplexing-Passive Optical Network(OFDM-PON) is experimentally demonstrated with Centralised Light Source(CLS) configuration in this paper.After transmitted over 25 km Standard Single Mode Fibre(SSMF) with-16.5 dBm optical power at receiver,the Bit Error Rate(BER) is 9.5×10~(-11).The implementations of digital domain up-conversion and down-conversion based on Field Programmable Gate Array(FPGA) are introduced,which can reduce the cost of In-phase and Quadrature(1Q) radio frequency mixers utilised at transmitter and receiver.A carrier synchronization algorithm is implemented for compensating carrier offset.A channel equalization algorithm is adopted for compensating the damage of channel.A new structure of Frequency Synchronization Unit(FSU) designed in FPGA is also proposed to cope with the frequency shifting at receiver.
Based-Real-time digital service and multimedia service upstream transmission in Digital Signal Processing (DSP) -based Orthogonal Frequency Division Multiplexing-Passive Optical Network (OFDM-PON) is experimentally demonstrated with centralized Light Source (CLS) configuration in this paper. After transmitted over 25 km Standard Single Mode Fiber (SSMF) with -16.5 dBm optical power at receiver, the Bit Error Rate (BER) is 9.5 × 10 ~ (-11). These implementations of digital domain up-conversion and down-conversion based on Field Programmable Gate Array (FPGA) are described, which can reduce the cost of In-phase and Quadrature (1Q) radio frequency mixers utilised at transmitter and receiver. A carrier synchronization algorithm implemented for compensating carrier offset. A channel equalization algorithm is adopted for compensating the damage of channel. A new structure of Frequency Synchronization Unit (FSU) designed in FPGA is also proposed to cope with the frequency shifting at receiver.