ITU-T G.692
Optical Interfaces for Multichannel Systems with Optical Amplifiers - Series G: Transmission Systems and Media, Digital Systems and Networks - Transmission Media Characteristics - Characteristics of Optical Components and Sub-Systems
| Organization: | ITU-T |
| Publication Date: | 1 October 1998 |
| Status: | active |
| Page Count: | 40 |
scope:
This Recommendation applies to optical interfaces for multichannel optical line systems with optical amplifiers for terrestrial long-haul applications. This Recommendation defines and provides values for optical interface parameters of interoffice and long-haul systems with target lengths up to 160 km without line amplifiers and with target lengths up to 640 km with optical line amplifiers. Descriptions of system reference configurations and their constituent functional blocks are contained in Recommendation G.681.
The purpose of this Recommendation is to provide optical amplifier specifications for SDH and optical amplifier equipment towards future realisation of transverse compatible multichannel systems. Not all specifications required to obtain full transverse compatible systems could be finalised at the present stage of development. However, because of industry interest and emerging implementations, this initial version is issued. A complete specification is left to future versions of this Recommendation.
This Recommendation applies principally to point-to-point multichannel systems. Specific issues of optical add-drop are not considered.
This Recommendation is envisioned to describe optical line systems that include the following features:
- maximum number of channels: 4, 8, 16 , 32 or more;
- signal channel types: STM-4, STM-16, or STM-64;
- transmission over a single fibre: unidirectional or bidirectional.
Given evolving technologies and markets, some aspects of the features described above are not fully characterised at this time, and are marked for further study. Some aspects of 16 and 32 channel systems, STM-64 and possibly bidirectional transmission are for further study. Some system aspects regarding bidirectional transmission (Appendix VII), regarding 16- and 32-channel transmission (Appendix VIII) and regarding STM-64 transmission (Appendix IX) are contained in the indicated appendices.
This Recommendation has been prepared from the experience with Erbium-Doped (silica-based) Fibre Amplifiers (EDFA), operating in the 1550 nm wavelength region. Other optical amplifiers operating at different wavelength regions, including the 13 10 nm region, are not intended to be excluded from this Recommendation.
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