Abstract
In this paper, a simplified optical millimeter-wave generated by two optical sidebands beating together in a 60 GHz radio over fiber (RoF) system with 10 Gbit/s 4-pulse amplitude modulation (4 PAM) transmission signal is proposed and simulated. 10 Gbit/s electrical 4 PAM signals modulated are conveyed over the length of 40 km standard single mode fiber (SMF) and recovered via the self-mixing technique after detecting directly at the receiver. Graphs of time-domain wave, frequency-domain and optical spectrum are measured out in different period, and the comparison of error vector magnitude curves of NRZ and 4 PAM signals under the different length of fiber is accomplished. The capacity of 4 PAM modulation is higher, though NRZ performs better than 4 PAM selected in RoF system within 80 km of fiber length as shown in the simulation results.
Highlights
High-speed and large-capacity transmission has been the focus of attention in the field of communication as global data growing fast
The 4-pulse amplitude modulation (4 PAM) signal is intensive signal modulated by a Mach-Zehnder modulator (MZM) at baseband and directly detected by a positive-intrinsic-negative photodiode (PIN-PD), and two paths of the mm-wave divided from a splitter are mixed together without wireless broadcast before one passing a phase shift
3 dB optical coupler, where one is modulated intensity via a MZM driven with the 10 Gbit/s baseband 4 PAM signal and the other one without data modulation
Summary
High-speed and large-capacity transmission has been the focus of attention in the field of communication as global data growing fast. The compact RoF optical access network is where high speed of text, voice, RF video data are provided to different service terminations between the OLT and ONU.
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