A four-level optical signal generation scheme based on DP-BPSK modulator
In the face of increasing data traffic demand in short-distance optical communication and the high cost of high-speed data center interconnection,a four-level optical signal generation scheme based on dual-polarization binary-phase-shift-keying(DP-BPSK)modulator is proposed.Experimental framework of the proposed scheme consists of a la-ser diode(LD),DP-BPSK modulator driven by binary data,polarization controller(PC),and polarizer.The DP-BPSK modulator driven by binary data without digital analog converter,making it structurally simple and easy to implement.To verify the feasibility of the proposed scheme,4-level pulse amplitude modulation(PAM-4)signals are generated using this scheme and transmitted over a 65km standard single-mode fiber(SSMF)at different data rates.The performance of these signals is evaluated based on the experimental results,including the eye diagrams and bit error rate(BER),which indicates that the transmitted signals have a high quality.Therefore,the proposed scheme has promising application po-tential in future short-distance optical communication.
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