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Question 6/6
Optical fibre cable network maintenance
(Continuation of Question 5/6)
1 Motivation
Broadband optical access services are now commercially available. The number of fibre to the home (FTTH) subscribers is increasing rapidly. Broadband network provision currently requires the accommodation of thousands of optical fibres in a central office for optical access networks. Outside plant maintenance is very important if we are to achieve a highly reliable optical network.
Progress on multimedia technologies has led to the active development of many kinds of broadband services such as data and video communication in access networks. We have already studied the maintenance wavelength for fibre carrying signals in order to find a suitable wavelength for preventive maintenance. In addition, we must study the maintenance test light-filtering requirement for in-service fibre line testing to avoid interfering with optical communication signals in the access network.
Trunk line communication traffic is also increasing rapidly due to the expansion of FTTH services. To meet the demand for increased transmission capacity, WDM and distributed Raman amplifier technologies have been employed in trunk line transmission systems, and consequently high power communication signals and high pump power have been introduced into optical fibre cables. To achieve the reliable maintenance of the optical cable networks, we must study optical fibre cable maintenance systems that can be applied to optical fibre cable carrying high optical total power.
2 Question
Study items to be considered include but are not limited to the following.
In the FTTH era, more effective and more efficient maintenance of optical cable networks must be provided. With a view to realizing a highly reliable optical cable network transporting WDM signals with a wide spectral bandwidth, the maintenance criteria for in-service fibre line testing without interfering with the optical communication signals in the access network will be studied. Moreover optical fibre cable maintenance systems to be used with optical fibre cable carrying high optical total power, and which take account of the safety guidelines related to optical transmission systems using high optical power, will also be studied
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What is the maintenance band and test light filtering requirement for testing in-service fibres without interfering with optical communication signals in access networks?
- What is an optical fibre cable maintenance system for optical cable networks carrying high optical total power?
- What are safety guidelines for the maintenance of outside optical fibre plant carrying high optical total power?
An up-to-date status of work under this Question is contained in the SG 6 Work Program
(http://www.itu.int/itudoc/itu-t/com6/index.asp).
3 Tasks
Tasks include but are not limited to:
Recommendations on:
- Optical fibre cable maintenance criteria for in-service fibre testing in access networks
2006
- Optical fibre cable maintenance support, monitoring and testing system for optical fibre cable networks carrying high optical total power
2007
4 Relationships
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Recommendations: L.40, L.41, L.53
- Questions: 4/6, 8/6
- Study Groups:
- Standardisation bodies , forum and consortia:
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