Abstract
In order to meet the transmission needs of WDM-PON system, a WDM-PON full-duplex system based on reflective semiconductor optical amplifier (RSOA) remodulation was constructed in this paper. The downlink transmission rate of the system was 40Gb/s, and the downlink adopted three modulation formats, namely carrier suppression return to zero (CSRZ), optical duobinary (ODB) and quadrary pulse amplitude modulation (PAM4); the uplink transmission rate of the system was 10Gb/s, and the uplink adopted NRZ code. Through the simulation, the transmission performance of the system under these three modulation formats was compared and analysed?and the system uplink/downlink eye diagram and Q-value graph were obtained. The results show that the PAM4 signal has the strongest anti-dispersion capability and the ODB has the highest anti-nonlinear tolerance.
Highlights
Today's mobile communications have entered the 5G era and Wavelength Division Multiplexing Passive Optical Network (WDM-PON) has been identified as one of the 5G fronthaul pass bearing solutions
A WDM-PON full duplex system based on reflective semiconductor optical amplifier (RSOA) re-modulation is shown in figure 1
The spectrum of the three modulation formats are shown in figure 3(a)-(c).The spectrum width of optical duobinary (ODB) is about 40GHz, which is about half of that of NRZ signal, with no carrier frequency component at the centre frequency, no discrete component, and high spectrum utilization.The spectrum of PAM4 is tighter, with a spectrum width of about 40GHz and strong anti-dispersion capability.The spectrum width of carrier suppression return to zero (CSRZ) signal is about 95GHz, with no spikes at the carrier frequency
Summary
Today's mobile communications have entered the 5G era and WDM-PON has been identified as one of the 5G fronthaul pass bearing solutions. The fronthaul network is the network between the DU and the AAU, it plays a very important role in the 5G communication architecture[2]. In high-speed WDM-PON communication system, loss, chromatic dispersion (CD), polarization mode dispersion (PMD),etc in the optical fiber become the main factors affecting the transmission performance as the transmission rate increases[4]. The selection of modulation format is one of the key factors affecting the transmission performance of WDM-PON systems. A WDM-PON full duplex system based on reflective semiconductor optical amplifier (RSOA) re-modulation is shown in figure 1. The optical spectrum of the 10-channel signal after multiplexing is shown in figure 2.
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