Abstract
In this paper, the transceiver performance of optical 64QAM-OFDM signals with different sub-car- riers is studied. Firstly, we build a 40Gbit/s optical coherent 64QAM-OFDM transmission system. 64QAM-OFDM optical signals with 16, 32, 64, 64, 128, 256 and 512 sub-carriers are transmitted over 100 km single mode fiber (SMF). Then, the optical spectrum diagrams before and after transmission, the bit error rate (BER) and constellation diagrams of received signals were compared. The simulation results show that, with the number of sub-carriers increasing, the value of PAPR will gradually increase and the quality of the received optical signals will deteriorate. Moreover, with the number of sub-carriers increasing, the computational complexity will increase when digital signal processing (DSP) is used. Therefore, we should choose the optimal number of sub-carriers, and the PAPR influence and BER are also considered for achieving effective transmission.
Highlights
Orthogonal Frequency division multiplex (OFDM) technology has been widely used in the optical transmission systems, because it has characteristics of effectively against dispersion, eliminating the inter symbol interference (ISI) and flexible bandwidth allocation [1] [2]
The optical spectral diagrams, the bit error rate (BER) and the constellation diagrams of the received optical coherent 64QAM-OFDM signals in the case of 16, 32, 64, 128, 256 and 512 sub-carriers are measured by simulation, as well as the peak to average power ratio (PAPR) and computational complexity are analyzed
The comparison shown that the bit error rate is gradually increased and the quality of optical receiving signal gradually deteriorated with the increase of the number of sub-carriers in optical coherent 64QAM-OFDM transmission system
Summary
Orthogonal Frequency division multiplex (OFDM) technology has been widely used in the optical transmission systems, because it has characteristics of effectively against dispersion, eliminating the inter symbol interference (ISI) and flexible bandwidth allocation [1] [2]. In OFDM modulating technique, a large number of sub-carriers are multiplexing in the frequency domain, which will cause higher peak to average power ratio (PAPR) [3]. The higher PAPR is one mainly drawback for OFDM signals transmission [6]. We analyzed the transceiver performance in coherent 64QAM-OFDM optical transmission system as different number sub-carriers are adopted. We set up one 64QAM-OFDM optical transmission system by simulation. The optical spectral diagrams, the bit error rate (BER) and the constellation diagrams of the received optical coherent 64QAM-OFDM signals in the case of 16, 32, 64, 128, 256 and 512 sub-carriers are measured by simulation, as well as the PAPR and computational complexity are analyzed. (2016) Optical 64QAM-OFDM Transmission Systems with Different Sub-Carriers.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
