Spectrally Efficient Elastic Optical Path Network (SLICE)

Technological fields
Telecommunications Network Technologies
Keyword
  • Optical network
  • Spectral efficiency
  • Adaptive resource allocation
Laboratory organization
NTT Network Innovation Laboratories

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Overview

Sustaining the growth of data traffic will require a more efficient and scalable optical transport platform for links of 100 Gbit/s and beyond. We devised a novel, spectrum-efficient and scalable optical transport network architecture, called the spectrum-sliced “elastic optical path” network (SLICE), and demonstrated its feasibility. Conventional optical networks allocate fixed bandwidth to every optical path regardless of its actual traffic volume and path length on the basis of the worst-case design policy. In contrast, SLICE applies adaptive spectrum allocation to an optical path according to the traffic volume and path length. Together with adaptive modulation format selection and elastic channel spacing, SLICE provides significant spectral resource savings; it would be a cost-effective means of optical transport in the coming 100 Tbit/s /fiber era.

Features

  • Adaptive spectral resource allocation to an optical path according to traffic demand and path length to achieve significant savings of network resources
  • Multi-rate, multi-reach (modulation format) optical transponders that generate the necessary minimum spectral width
  • Bandwidth-variable ROADM*1s and WXC*2s that establish end-to-end elastic optical paths
  • Elastic channel spacing by using the frequency slot concept instead of the current ITU-T fixed frequency grid
  • A routing and spectrum assignment (RSA) algorithm that accommodates various traffic demands in a spectrally efficient manner

Application scenarios

  • Metro transport networks that support a per-channel capacity of 100 Gbit/s and beyond in a highly economical manner
  • Core transport networks that support a per-channel capacity of 100 Gbit/s and beyond in a highly economical manner
  • Optical virtual private line service with a wide variety line rates
  • *1 ROADM: Reconfigurable Optical Add/Drop Multiplexer
  • *2 WXC: Wavelength Cross-Connect

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