Abstract
The optical access network is currently driving studies on transmissions beyond 10 Gbit/s. This paper reports an analysis of Pulse Amplitude Modulation (PAM), seen as a promising candidate for future Passive Optical Networks (PON). Previous 25 Gbit/s real-time PAM4 results are extrapolated here with simulations to higher bit rates and a higher number of PAM levels. Our main goal is to evaluate the compliancy of PAM with the existing standards and legacy networks as far as fiber length, optical budget class, and wavelength plan are concerned. The simulations enlighten us as to the challenges of multilevel modulation formats, such as noise and jitter, compared to the currently adopted Non-Return-to-Zero (NRZ).
Highlights
The future of access networks is currently motivating research and standardization activities onTime Division Multiplexing Passive Optical Network (TDM-Passive Optical Networks (PON)) solutions beyond 10 Gbit/s
NG-PON2 technology is not deployed in access networks and here we focus on future Time Division Multiplexing Passive Optical Network (TDM-PON) in coexistence with legacy technologies deployed for residential
We demonstrated a real-time 25 Gbit/s PAM4 downstream transmission based on 10 G optics, achieving a 29 dB Optical Budget (OB) corresponding to a −18.5 dBm receiver sensitivity up to 40 km in O band [11]
Summary
The future of access networks is currently motivating research and standardization activities on. 41.85 Gbit/s downstream PAM8 achieving a −13 dBm receiver sensitivity with 10 G optics and Digital Signal Processing (DSP) was demonstrated over 20 km of fiber [15]. 50 Gbit/s Electrical Duo-Binary (EDB) over up to 20 km in O band without DSP [6] Those new modulation formats for the access network have additional requirements compared to the NRZ. We demonstrated a real-time 25 Gbit/s PAM4 downstream transmission based on 10 G optics, achieving a 29 dB Optical Budget (OB) corresponding to a −18.5 dBm receiver sensitivity up to 40 km in O band [11]. Forward Error Correction (FEC), which is essential to assure the interoperability of the physical layer in access networks while allowing low-cost customer premises equipment (CPE)
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