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ITU-T Study Group 15 List of Questions Under Study (Study Period 2005-2008) |
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ITU-T SG 15 Question 5/15 |
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Characteristics and test methods of optical fibres and cables (Continuation of Question 15/15)
- Motivation
Optical fibre cables have been specified and deployed in telecommunication
networks worldwide, finding wide application in local access networks,
interoffice and long distance networks, and in submarine networks.
Nevertheless, new optical fibre technologies and new applications continue
to drive the need for additional specifications.
The responsibility under this Question includes the following areas of standardization:
- the description and testing of basic single-mode and multimode
fibre types, with parameter tables describing the variations within
each of the basic types
- definitions of parameters and associated test methods for
geometrical, transmission, mechanical and reliability characteristics
The following major Recommendations, in force at the time of approval
of this Question, fall under its responsibility: G.650-series, G.651,
G.652, G.653, G.654, G.655, G.656.
- Question
- What fibre characteristics are needed to:
- support bit-rates up to and above 40 Gbit/s with time-division multiplexing (TDM)?
- support systems that mix both analogue and digital modulation formats?
- open new spectral transmission regions as the passband of optical
amplifiers increases and as the number of wavelength-division
multiplexed channels increases?
- support systems in metropolitan networks?
- support Coarse Wavelength Division Multiplexing (CWDM) applications?
- How can the nonlinear optical effects that accompany reduced channel
spacing be characterized and controlled?
Study items to be considered include, but are not limited to:
- Geometrical, mechanical, and optical properties of the glass
and coating, for single-mode fibre applications
- Reliability (lifetime and failure rate) under a wide variety
of temperature and humidity environments; long-term aging
- Completion of the definition, modelling, and measurements
of Polarization Mode Dispersion (PMD), relationship between fibre
and cable values, interaction with chromatic dispersion
- Determine how the attenuation, chromatic dispersion, and
bending loss of fibres affects their use in various applications around 1600 nm
- Test methods for nonlinear parameters (describing Stimulated
Brillouin Scattering (SBS), Self Phase Modulation (SPM), four-wave
mixing, modulation instability, soliton formation, etc.) such as
power thresholds, effective area, nonlinear coefficients
- Possible additional fibre types, and additional parameter
tables within the existing Recommendations
- Possible additional fibre types optimized for the metropolitan networks
- Length uniformity of fibre geometrical and transmission
characteristics that have a functional impact on systems, and
are not merely a quality control issue
- Dispersion management of high-performance systems
- Fibre damage from high power and small bend radii
- Tasks
Tasks include, but are not limited to:
- Modify parameters in Recommendations G.651, G.652, G.653, G.654, G.655 and G.656
- Develop new Recommendations or parameter tables within existing
Recommendations for possible additional fibre types
- Develop definitions of new parameters, and corresponding factory
and field test methods, RTMs and ATMs, for G.650.1, G.650.2, and G.650.3
- Develop guidelines for users of optical fibres and cables
Note: An up-to-date status of work under this Question is contained in the
SG15 Work Programme.
- Relationships
- Recommendations:
- Questions:
- Q16/9, Q2/15, Q6/15, Q7/15, Q8/15 and Q10/15
- Study Groups:
- ITU-T SG 6 on cables issues, field deployment, and monitoring the integrity
of installations
- Standardization bodies, forums and consortia:
- IEC SC86A on general fibre matters, especially reliability, cable performance,
and fibre test calibration
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