S-BVT for next-generation optical metro networks: benefits, design, and key enabling technologies

Abstract

This work elaborates on: i) why the sliceable bandwidth variable transceiver (S-BVT) represents a key enabler for nextgeneration optical metro networks; ii) how it should be designed to take benefit of its capabilities and advanced features; and iii) which are the promising technologies to be adopted addressing the most relevant requirements and challenges. Specifically, S-BVT architectures based on multicarrier modulation and flexi-grid technologies, adopting cost-effective optoelectronic front-ends, enable flexible adaptation to dynamic traffic and variable path condition, targeting high capacity and scalability, while saving network resources and costs. Programmability and modularity are envisioned for integration in software-defined optical metro networks.

Synergy of Photonic Technologies and Software-Defined Networking in the Hyperconnectivity Era

“…In this context, the bandwidth/bitrate variable transceiver (BVT) represents a key element [5], which allows integrating, in a synergetic fashion, novel photonic technologies with an [6]. Furthermore, sliceable BVT (S-BVT) architectures able to generate multiple adaptive and variable flows, (re)-configurable via SDN commands, can be designed to have a modular implementation based on photonic integrated circuits (PICs) [6], [7]. Modularity is key to size the S-BVT according to a grow-as-needed approach, following a pay-as-you-grow model.…”

“…This requires digital-toanalog and analog-to-digital conversion (DAC/ADC). At the Tx and Rx, different optoelectronic frontends, photonic technologies and devices can be adopted [6]. External or direct modulation with alternative laser sources at the Tx, and coherent (CO) or direct detection (DD) at the Rx are technology options trading-off ultimate performance against reduced cost/complexity, as it will be detailed in subsection A.…”

“…External or direct modulation with alternative laser sources at the Tx, and coherent (CO) or direct detection (DD) at the Rx are technology options trading-off ultimate performance against reduced cost/complexity, as it will be detailed in subsection A. In addition to full spectral manipulation with wide range granularity, multiple dimensions can be exploited, such as the polarization and spatial dimensions [6] [13]. Polarization division multiplexing (PDM) can be combined with either coherent or direct detection techniques [14].…”

Sliceable BVT Evolution Towards Programmable Multi-Tb/s Networking

“…Tailored solutions must be envisioned to address the high demand of dynamicity and capacity, while coping with the stringent cost and energy requirements. Accordingly, the role of mature and novel photonic technologies, as well as dense photonic integration able to reduce costs, power consumption, and footprint, is particularly important for the actual and optimal design of transceiver architecture [18,19].The purpose of this work is to review and analyze alternative S-BVT design architecture options targeting different network segments and applications, also including programmability aspects. We specifically focus on S-BVT architecture based on MCM, which provide a wide range of granularity.…”

“…Tailored solutions must be envisioned to address the high demand of dynamicity and capacity, while coping with the stringent cost and energy requirements. Accordingly, the role of mature and novel photonic technologies, as well as dense photonic integration able to reduce costs, power consumption, and footprint, is particularly important for the actual and optimal design of transceiver architecture [18,19].…”