Table of Contents

 1     Scope          
 2     References               
 3     Terms and definitions           
 4     Abbreviations and acronyms             
 5     Definition of spectral bands               
        5.1     General considerations             
        5.2     Allocation of spectral bands for single-mode fibre systems       
        5.3     Bands for multimode fibre systems     
 6     Parameters of system elements      
        6.1     Line coding     
        6.2     Transmitters  
        6.3     Optical amplifiers         
        6.4     Optical path    
        6.5     Receivers        
 7     Line coding considerations 
        7.1     Overview of various line coding schemes          
        7.2     Return to zero (RZ) implementation    
        7.3     ODB and RZ-AMI line coding format    
        7.4     Differential phase shift keying (DPSK) modulation implementations    
        7.5     Differential quadrature phase shift keying (DQPSK) implementation   
        7.6     DP-QPSK (PM-QPSK) implementation
        7.7     Optical orthogonal frequency division multiplexing (O-OFDM)
        7.8     Nyquist WDM
        7.9     Polarization division multiplexing binary phase shift keying (PDM-BPSK) implementation    
       7.10     Quadrature amplitude modulation (QAM) implementation    
       7.11     System impairment considerations    
 8     Optical network topology   
        8.1     Topological structures
 9     "Worst-case" system design              
        9.1     Power budget concatenation 
        9.2     Chromatic dispersion 
        9.3     Polarization mode dispersion 
        9.4     BER and Q factor          
        9.5     Noise concatenation  
        9.6     Optical crosstalk           
        9.7     Concatenation of non-linear effects – Computational approach             
10     Statistical system design    
       10.1     Generic methodology              
       10.2     Statistical design of loss           
       10.3     Statistical design of chromatic dispersion         
       10.4     Statistical design of polarization mode dispersion        
11     Forward error correction (FEC)        
       11.1     In-band FEC in SDH systems   
       11.2     Out-of-band FEC in optical transport networks (OTNs)              
       11.3     Coding gain and net coding gain (NCG)             
       11.4     Theoretical NCG bounds for some non-standard out-of-band FECs     
       11.5     Statistical assumption for coding gain and NCG             
       11.6     Candidates for parameter relaxation 
       11.7     Candidates for improvement of system characteristics             
12     Physical layer transverse and longitudinal compatibility       
       12.1     Physical layer transverse compatibility              
       12.2     Physical layer longitudinal compatibility            
       12.3     Joint engineering        
13     Switched optical network design considerations     
14     Best practices for optical power safety        
       14.1     Viewing          
       14.2     Fibre ends     
       14.3     Ribbon fibres
       14.4     Test cords      
       14.5     Fibre bends   
       14.6     Board extenders         
       14.7     Maintenance
       14.8     Test equipment          
       14.9     Modification 
      14.10     Key control  
      14.11     Labels             
      14.12     Signs               
      14.13     Alarms           
      14.14     Raman amplified systems      
Appendix I – Pulse broadening due to chromatic dispersion    

        I.1                   Purpose              
        I.2                   General published result             
        I.3                   Change of notation        
        I.4                   Simplification for a particular case            
        I.5                   Pulse broadening related to bit rate       
        I.6                   Value of the shape factor            
        I.7                   General result and practical units