Rec. ITU-T G.977.1 (10/2020) Transverse compatible dense wavelength division multiplexing applications for repeatered optical fibre submarine cable systems
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Terms and definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Classification of optical interfaces
     6.1 Applications
     6.2 Reference configurations
     6.3 Optical coupling junction
7 Repeatered-span partial transverse compatibility
8 Parameters
     8.1 Span loss
     8.2 Fibre types
     8.3 Wavelength ranges
     8.4 Maximum chromatic dispersion
9 Characteristics and performance of the system
     9.1 Optical loading specification
          9.1.1 Channel grid spacing
          9.1.2 Average power per channel
          9.1.3 Gain deviation and slope of tilt
          9.1.4 Optical signal-to-noise ratio
          9.1.5 Signal-to-noise ratio
          9.1.6 Generalized droop
          9.1.7 Linear signal-to-noise ratio
          9.1.8 Nonlinear signal-to-noise ratio
          9.1.9 Guided acousto-optic wave Brillouin scattering signal-to-noise ratio
          9.1.10 Modem signal-to-noise ratio
          9.1.11 Other signal-to-noise ratio impairments
          9.1.12 Generalized optical signal-to-noise ratio
          9.1.13 Total signal-to-noise ratio
     9.2 System specifications
          9.2.1 Span length
          9.2.2 Span loss
          9.2.3 Accumulated chromatic dispersion
          9.2.4 Passband
          9.2.5 Mean polarization mode dispersion
          9.2.6 Mean polarization dependent loss
          9.2.7 Number of repeaters
     9.3 Optical submarine repeater specification
          9.3.1 Total output power
          9.3.2 Repeater noise figure
          9.3.3 In-band monitoring channels
          9.3.4 In-band monitoring channel passband
     9.4 Branching unit specification
          9.4.1 Number of branching units
          9.4.2 Branching unit loss
          9.4.3 Branching unit span locations
     9.5 Equalizer specification
          9.5.1 Number of gain equalizers
          9.5.2 Gain equalizer losses
          9.5.3 Gain equalizer span periodicity
          9.5.4 Number of tilt equalizers
     9.6 Fibre specification
          9.6.1 Fibre effective area
          9.6.2 Fibre chromatic dispersion
          9.6.3 Fibre loss
          9.6.4 Fibre chromatic dispersion slope
          9.6.5 Fibre nonlinear coefficient
     9.7 Repair guidance
          9.7.1 Deep water
          9.7.2 Deep water repairs
          9.7.3 Shallow water
          9.7.4 Shallow water repairs
          9.7.5 Optical signal-to-noise ratio allocation for repairs
     10 Optical safety considerations
Annex A  Specification of transversally compatible dense wavelength division multiplexing applications for repeatered optical fibre submarine cable systems
     A.1 Introduction
     A.2 Key SNR performance parameters
     A.3 Key design specifications
     A.4 Key measurement specifications
     A.5 Commissioning specifications
Bibliography