CLC/TR 50460:2005

1 Scope
   1.1 General
2 Normative references
3 Terms, definitions, symbols and abbreviations
   3.1 Symbols
   3.2 Abbreviations
4 Topologies used for optical transmission systems in cable
   networks
   4.1 Point to point system
   4.2 Point to multi-point system
   4.3 Multi-point to point system
   4.4 Real wavelength division multiplex system
   4.5 Combinations
5 Influences of equipment and fibre parameters on the system
   performance
6 Optical modulation index
   6.1 Single wavelength system
   6.2 WDM systems
   6.3 Choosing the right input level at the transmitter
7 Carrier to noise ratio
   7.1 Short haul links with a single transmitter
   7.2 Long haul point to point link
       7.2.1 Long haul links with DFB lasers
       7.2.2 Long haul links with externally modulated transmitters
   7.3 Multiple transmitter systems (WDM)
   7.4 Transmission systems with optical fibre amplifier
8 Linearity
   8.1 Composite Second Order (CSO)
       8.1.1 CSO of 1 310 nm systems
       8.1.2 CSO of 1 550 nm systems
   8.2 Composite Triple Beat (CTB)
9 Flatness
10 Output level
Annex A (informative) Brillouin scattering in optical fibres
Annex B (informative) Noise sources of optical transmission systems
  B.1 Intensity noise
  B.2 Shot noise of the receiver
  B.3 Thermal noise
  B.4 Carrier to noise ratio
Annex C (informative) Non-linear distortion in optical
                      transmission systems
  C.1 Non-linear products definition
  C.2 Non-linear products weighting
  C.3 Distortion generators in direct modulation cable
      network transmissions
  C.4 Third order modelling
  C.5 "Summation" of distortion products
Bibliography
Figures
Tables

This Technical Report provides guidelines and procedures for determining the overall performance of optical transmissions systems used in cable networks for television signals, sound signals and interactive services. It is based on the requirements for optical equipment defined in the standard EN 60728-6 (Cable networks for television signals, sound signals and interactive services – Part 6: Optical equipment) and should be used together with this standard. The information provided is meant to help field engineers and network planners (system designers) in planning and designing optical systems. Though this content is less dense than in a standard, basic knowledge about system parameters of cable networks is needed.