Abstract

In this letter, a novel optical duobinary (ODB) downlink access scheme using low pass filter was proposed. The ODB downlink signal was generated by one continuous-wave (CW) laser, one pseudo-random binary sequence (PRBS) generator, one NRZ generator, one precoder, one Mach-Zehnder modulator and one low pass Bessel filter. The downlink signal can be transmitted over 20km singlemode fiber (SMF) and successfully received. We analyzed the time-domain waveforms, optical spectrum and eye diagrams before and after downstream transmission. The simulation results show that, compared to the traditional downlink scheme, this scheme has the advantages of high bandwidth efficiency, resistance to dispersion and good reception performance.

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