Rec. ITU-T G.957 (03/1993) … OPTICAL INTERFACES FOR EQUIPMENTS AND SYSTEMS RELATING TO THE SYNCHRONOUS DIGITAL HIERARCHY
FOREWORD
CONTENTS
1 Introduction
1.1 Abbreviations
2 Classification of optical interfaces
3 Parameter definitions
3.1 System operating wavelength range
3.2 Transmitter
3.3 Optical path
3.4 Receiver
4 Optical parameter values for SDH applications
5 Optical engineering approach
5.1 Design assumptions
5.2 Worst-case design approach
5.3 Statistical design approach
5.4 Upgradability considerations
Annex A … System operating wavelength considerations
A.1 Operating wavelength ranges determined by fibre attenuation
A.2 Operating wavelength ranges determined by fibre dispersion
Appendix I … Measurement of the mask of the eye diagram of the optical transmit signal
I.1 Measurement set-up
I.2 Transfer function of the optical reference receiver
Appendix II … Methods for measuring reflections
II.1 Optical continuous-wave reflectometer
II.2 Optical time-domain reflectometer
Appendix III … Possible method for evaluating aging margin contribution in receiver sensitivity specifications
III.1 Receiver sensitivity and eye opening
III.2 S/X test method
Appendix IV … Upgradability examples
Reference