Distance adaptive hybrid super-channels enabled by sliceable bandwidth variable transponder for spectrally efficient elastic optical networks

Ujjwal,; Kumari, Neha; Thangaraj, Jaisingh; Roy, Chhandita

doi:10.1016/j.comnet.2021.108533

Cited by 3 publications

(1 citation statement)

References 20 publications

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“…This elasticity in terms of modulation format, bandwidth, bit rates, and channel spacing has enabled EONs. Furthermore, super-channel (or multicarrier) transmission, supported by EONs, is one of the most promising methods for accommodating the high line rates necessary to satisfy continuous traffic growth [3][4][5][6][7][8][9]. However, super-channel optimization is particularly challenging due to the subcarrier cross-talk and filtering effects on the side subcarriers [10,11], resulting in degradation of the overall quality of transmission (QoT).…”

Section: Introductionmentioning

confidence: 99%

Super-channel spectrum saving optimization procedure in elastic optical networks

Radovic¹,

Sgambelluri²,

Cugini

et al. 2023

J. Opt. Commun. Netw.

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Optical networks have historically been overprovisioned for physical-layer conditions and capacity and, as such, operate uninterrupted over several years. By reducing system margins, network efficiency and cost savings could be improved without compromising network reliability. On the other hand, super-channel transmission has been identified as a suitable solution for supporting high-data-rate connectivity. NETCONF, along with YANG models, has been recognized as a software defined networking (SDN) configuration and management protocol enabling control in a vendor-neutral way. Moreover, the OpenConfig YANG model defines vendor-specific transmission parameters, such as modulation format and bit rate, within operational modes. This paper investigates the trade-off between super-channel quality of transmission (QoT) and spectrum saving by allowing slight subcarrier overlap and tight filtering, hence reducing system margins. An automatic spectrum-efficient super-channel optimization procedure is experimentally demonstrated using a 600 Gbit/s transponder in an SDN-controlled elastic optical network. The automatic procedure performs the adaptation of filter bandwidth and subcarrier spacing. The latter is effectively operated by transponder agents, without involving the SDN controller, thus reducing the margins while guaranteeing that the QoT enables savings of up to 25% of the spectrum.

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Section: Introductionmentioning

confidence: 99%

Super-channel spectrum saving optimization procedure in elastic optical networks

Radovic¹,

Sgambelluri²,

Cugini

et al. 2023

J. Opt. Commun. Netw.

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show abstract

An improved cost function-based class of service provisioning scheme for elastic optical networks

Batham,

Thakare

2024

Computer Networks

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Power-aware high-capacity elastic optical networks

Radovic,

Sgambelluri,

Cugini

et al. 2024

J. Opt. Commun. Netw.

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The power consumption of telecommunication equipment has been identified as a relevant contributor to global energy consumption. In fact, new-generation optical transponders employ power-intensive electronic application-specific integrated circuits (ASICs) for digital signal processing (DSP). DSP design has traditionally prioritized meeting transmission requirements over power consumption optimization. In general, the evolutions of transmission techniques and network design have always been mainly driven by traffic increase; in this context, in order to operate network resources more efficiently, margin reduction has been investigated in the past few years. Indeed, traditionally, high physical layer margins are used to ensure reliability over an extended period, resulting in overprovisioning the optical connections for both physical layer conditions and capacity. On the other hand, super-channels have emerged as a suitable solution for accommodating the continuous traffic growth. However, power consumption has not been deeply considered in the optimization of super-channel transmission. This paper first investigates the power efficiency of super-channels operated with designed and reduced margins. Low-margin operation is enabled by adapting sub-carrier spacing and filter bandwidth. Power-aware super-channel optimization is then experimentally demonstrated leveraging a 600 Gbit/s transponder in the SDN-controlled elastic optical network (EON). The results have identified a trade-off between power consumption and spectrum efficiency. Furthermore, the ongoing bandwidth demand has motivated the investigation of multi-band (MB) transmission for scaling the capacity of the existing infrastructures. However, novel networking devices (e.g., optical amplifiers operating beyond the C- and L-bands) will affect the overall power consumption. In this context, experimental power analysis of a thulium doped fiber amplifier (TDFA) is performed based on the traffic load and corresponding configuration. The results show that TDFA power consumption varies with configuration and increases with output power.

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Distance adaptive hybrid super-channels enabled by sliceable bandwidth variable transponder for spectrally efficient elastic optical networks

Cited by 3 publications

References 20 publications

Super-channel spectrum saving optimization procedure in elastic optical networks

Super-channel spectrum saving optimization procedure in elastic optical networks

An improved cost function-based class of service provisioning scheme for elastic optical networks

Power-aware high-capacity elastic optical networks

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