Experimental Study on 25 Gbps C-Band PON over up to 25 km SMF Using a 10G-Class DML + APD IM-DD System

Haoyi Wang,Valter Ferrero,Pablo Torres-Ferrera,Roberto Gaudino

doi:10.3390/photonics8080328

Haoyi Wang, Valter Ferrero + Show 2 more

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https://doi.org/10.3390/photonics8080328

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Journal: Photonics	Publication Date: Aug 11, 2021
Citations: 4	License type: CC BY 4.0

Affiliation: Polytechnic University of Turin

Abstract

In this paper we present an experimental analysis of several modulation formats (pulse amplitude modulation (PAM-2), quaternary pulse amplitude modulation (PAM-4) and electrical duobinary (EDB)) for passive optical network (PON) applications at 25 Gbps bit rate in a C-band 10G-class directly modulated lasers (DML) and avalanche photodiode (APD) intensity modulation and direct detection (IM-DD) system over a single mode fiber (SMF) of up to 25 km, optimizing DML operations and demonstrating that PAM-2 is a promising choice. We also theoretically and experimentally analyzed the channel frequency response of DML and SMF affected by DML chirp and SMF chromatic dispersion.

Highlights

The time division multiplexed (TDM) passive optical network (PON) has been one of the most important architectures to support the increasing bandwidth and traffic requirements in access networks
In this paper we present an experimental analysis of several modulation formats (pulse amplitude modulation (PAM-2), quaternary pulse amplitude modulation (PAM-4) and electrical duobinary (EDB)) for passive optical network (PON) applications at 25 Gbps bit rate in a C-band 10G-class directly modulated lasers (DML) and avalanche photodiode (APD) intensity modulation and direct detection (IM-DD) system over a single mode fiber (SMF) of up to 25 km, optimizing DML operations and demonstrating that PAM-2 is a promising choice
We performed the characterization of our 10G-class DML in terms of measured frequency response at different bias current ib. ib = 60 mA was selected to ensure the optimum performance of the DML

Summary

Introduction

The time division multiplexed (TDM) passive optical network (PON) has been one of the most important architectures to support the increasing bandwidth and traffic requirements in access networks. DML represents a good choice when it operates in a system with low chromatic dispersion (CD), for example, in O-band, because of the low cost and small footprint advantages [14,15,16], while, because of laser chirp effects, it is usually less suitable for C-band operation It was shown in [17] that DML, when operated in some specific situations, can even achieve a better performance than electroabsorption modulated laser (EML) and Mach–Zehnder modulator (MZM) in C-band, since under proper combination of adiabatic and nonadiabatic chirp, DML can give a higher nonfaded bandwidth than EML and MZM. 100 Gb/s commercial DML has yet to be released [23]

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