Preliminary Assessment of Photonic Solutions Based on C-Band VCSELs for Multi-Tb/s Metro Networks

Abstract

C-band InP vertical cavity surface emitting laser (VCSEL) exploitation can be appealing also for high-capacity transmission over hundreds of kilometres. Long-wavelength VCSELs can represent an alternative solution for the development of transmitters with reduced cost, power consumption and footprint by adopting direct modulation (DM) and single sideband (SSB) discrete multitone (DMT) modulation to achieve dense wavelength division multiplexing (WDM) granularity. Due to numerous hops between nodes inside metropolitan area networks the effect of filtering can severely impact the transmission performance. We present preliminary experimental assessments of DM VCSEL sources with multi-carrier modulation formats, for more than 50 Gb/s per-channel transmission to target a metro network including nodes, handling 25-GHz granularity.

Enabling dynamic all optical IP off-loading at Tb/s rates in large Metro Networks

“…In order to evaluate the viability of primary and backup paths in a huge MAN, we employed a simulation tool that proved to be in good agreement with the experimentation in case of single side-band (SSB) DMT DM-VCSELs in presence of tight filtering [1,3]. The tool allows to determine the OSNR threshold required to cross a certain number of nodes of different types to achieve a capacity per VCSEL of 50 Gb/s, 40 Gb/s and 25 Gb/s, respectively, taking into account the proposed S-BVT characteristics.…”

Dual Modulation VCSEL-Based Sustainable Transceiver for SSB DMT Signals Transmission

“…The transmitter employs a 17 GHz-bandwidth VCSEL (with 5 MHz linewidth [8]) and a MZM with a 20 GHzbandwidth and a π-voltage equal to 5 V ( [7]). The VCSEL main parameters for the chirp are: α VCSEL = 3.7, κ = 15.2 GHz/mW ( [8]) and P0 = 2.6 mW.…”

“…The transmitter employs a 17 GHz-bandwidth VCSEL (with 5 MHz linewidth [8]) and a MZM with a 20 GHzbandwidth and a π-voltage equal to 5 V ( [7]). The VCSEL main parameters for the chirp are: α VCSEL = 3.7, κ = 15.2 GHz/mW ( [8]) and P0 = 2.6 mW. For a comparison, it is considered also the transmitter constituted by the cascade of the VCSEL and an EAM with linewidth enhancement factor equal to 0.5 ([6]) and a 20 GHz-bandwidth.…”

All-optical aggregation and distribution of traffic in large metropolitan area networks using multi-Tb/s S-BVTs

“…The viability of primary and backup paths in a large MAN topology is assessed via simulations estimating the impairments caused by the nodes traversal by computing the necessary OSNR to achieve a specified Bit Error Rate (BER). The employed simulation tool has been previously validated with experimental results in case of single side-band (SSB) DM-VCSELs in networks characterised by tight optical filtering [12,32]. The tool is schematically represented in Fig.…”