(Continuation of Question 15/15)
Background and justification
Optical fibre cables are being deployed at accelerated rates in
telecommunication networks worldwide. These fibres find wide
application in local access networks, interoffice and long
distance networks, and in submarine networks.
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, and mechanical reliability
characteristics
The responsibility under this Question includes the following
Recommendations:
G.650: Definition and test methods for the relevant
parameters of single-mode fibres
G.651: Characteristics of a 50/125 um multimode
graded-index optical fibre cable
G.652: Characteristics of a single-mode optical fibre
cable
G.653: Characteristics of a dispersion-shifted
single-mode optical fibre cable
G.654: Characteristics of a cut-off shifted single-mode
optical fibre cable
G.655: Characteristics of a non-zero dispersion-shifted
single-mode optical fibre cable
Question
- What fibre characteristics are needed to support bit-rates up
to and above 40 Gbit/s with time-division multiplexing (TDM)?
- What fiber characteristics are needed to support systems that
mix both analogue and digital modulation formats?
- What fibre characteristics are needed to open new spectral
transmission regions as the passband of optical amplifiers
increases and as the number of wavelength-division multiplexed
channels increases?
- What specific fibre characteristics are needed to support
systems in the metropolitan networks?
- What specific fibre characteristics are needed to support
CWDM applications?
- How can the nonlinear optical effects that accompany reduced
channel spacing be characterized and controlled?
Study items
Geometrical, mechanical, and optical properties of the glass
and coating, for single-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 SBS, 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
Specific tasks and deadlines
Modify parameters in G.651, G.652, G.653, G.654, and G.655;
(within 2002)
- Develop new Recommendations or parameter tables within
existing Recommendations for possible additional fibre
types; (within 2002)
- Develop definitions of new parameters, and corresponding
factory and field test methods, RTMs and ATMs, for G.650:
(within 2002)
Relationships
Other relevant Questions of SG 15 on optical systems
- ITU-T SG 6 on cable issues and monitoring the integrity of
installations
- IEC SC86A on general fibre matters, especially reliability,
cable performance, and fibre test calibration
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