Abstract-We report a cost-effective 40-Gb/s time-division multiplexing passive optical network (TDM-PON) downstream link using 3-level electrical duobinary (EDB) modulation. The transmitter consists of a compact electroabsorption-modulated laser (EML) module. The receiver contains an avalanche photodiode (APD) packaged with a transimpedance amplifier (TIA), with digitally adjustable gain and bandwidth, followed by a duobinary decoder. Real-time eye diagram and bit-error rate (BER) measurements were performed. At a pre-forward error correction (FEC) BER of 10 −3 , a power budget of 23.6 dB in back-to-back conditions is demonstrated. For a dispersion range of −215 ps/nm to 128 ps/nm, the power penalty does not exceed 3 dB.
Abstract:We report a cost-effective 40-Gb/s TDM-PON downstream utilizing an integrated DFB-EAM in OLT and an APD-based 3-level detection receiver in ONU, achieving a high power budget of 23.4 dB in real time operation.OCIS codes: (060.2360) Fiber optics links and subsystems; (060.0060) Fiber optics and optical communication.
In anticipation of emerging applications such as business services, 5G, and the Internet of Things, research and standardization are working together towards next-generation 25/50 Gbit/s passive optical network access networks. However, the increase in single-channel line rate is limited by the distortion introduced by the low-cost device’s bandwidth limit or the chromatic dispersion in the fiber. Burst-mode electronic distortion/dispersion compensation can be used to mitigate these effects, but requires a burst-mode equalizer (BMEQ) for upstream traffic and introduces many challenges. In this invited paper, the feasibility of single-channel, directly modulated upstream 25 Gbit/s non-return-to-zero transmission is investigated in more detail. By using a linear burst-mode transimpedance amplifier together with an offline BMEQ, specific BMEQ penalties and trade-offs such as limited training time and burst-to-burst phase variation are considered.
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