CONTENTS

 1     Scope 
 2     References 
 3     Terms and definitions       
 4     Abbreviations   
 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     Return-to-zero (RZ) implementation           
        7.2     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 
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