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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 7/15 |
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Characteristics of optical components and subsystems (Continuation of Question 17/15)
- Motivation
The increasing complexity of optical networks has brought about an
increasing diversity of active, passive and hybrid or dynamic optical
components and devices. These components and devices find applications
in local access networks, interoffice and long distance networks,
and in submarine networks. Functions differ with the application.
This Question addresses the high level need expressed by the system
Recommendations and network operators. It serves as an interface to
the component level standards generated outside of ITU-T in organizations such as IEC.
The following major Recommendations, in force at the time of approval
of this Question, fall under its responsibility: G.661, G.662, G.663, G.671
- Question
- What components aspects and desirable characteristics need
to be specified to support local access networks, interoffice
and long distance networks, and submarine networks including
evolution to OTN?
- What enhancements should be made to existing draft or
published Recommendations to reflect technological developments?
Study items to be considered include, but are not limited to:
- Active devices and sub-systems such as Optical Fibre Amplifiers (OFAs),
including parameter definitions and measurement, classification of devices
and sub-systems, optical nonlinearities, polarisation, dispersion, noise and optical surge
- Passive components such as splices and connectors, attenuators and
terminators, 1-by-N branching components (such as splitters and combiners),
2-wavelength optical multiplexers and demultiplexers, filters and isolators,
optical switches, dispersion compensators, optical mux/demux
- Worst-case transmission parameter values (for all environments and
to end-of-life) for passive components in digital applications
- Specification of Optical Amplifier (OA) characteristics in multichannel
applications including their frequency equalization and dynamic response
- Semiconductor Optical Amplifiers (SOA) and their characteristics
- Raman optical amplifiers and their characteristics
- Single channel optical amplifiers and their characteristics
- Optical transfer function of components
- Specification of optical components and sub-systems for
optical networking including optical add/drop multiplexers and
optical cross connects. (Optical subsystems in this context
relate to the optical aspects of the network elements)
- Specification of optical components and sub-systems for
local access networks
- Specification of other optical amplifier sub-systems
(e.g. those resulting from integration of optical amplification
with optical multiplexing or dispersion compensation)
- Specification of components for present and future optical
networks, such as switch-resistant OAs, gain-flattened OAs and wideband OAs,
optical circulators, optical modulators, electrically controlled optical
attenuators, passive and active dispersion compensators including
Polarisation Mode Dispersion (PMD) compensators, multi-wavelength and/or
fine tuning lasers & ext. modulators, high-power lasers for Raman
amplification "flat-top", passband filters, small-size switching matrixes,
wavelength/frequency transponders or converters, optical repeaters (2R, 3R)
- Components and subsystems for use in soliton transmission;
- OFAs, components and subsystems for use in bi-directional transmission
systems on a single fibre
- OFAs other than Erbium Doped Fibre Amplifiers (EDFAs)
- Operations, administration, and maintenance (OA&M) aspects of OAs
- Further quantification of optical nonlinearities
- Parameter values for components with respect to statistical values,
such as mean and standard deviation, short-term variations with environment,
long-term degradation with aging, use of these in system calculations
- Safety and reliability aspects of all the above components, including
aspects of operation at high optical power levels
- Possible extension of the components and subsystems for use in optical
networks that are optimized for packet data transport, e.g. IP or ATM over
Wavelength Division Multiplexing (WDM), including optical label switching components
- Tasks
Specific tasks include, but are not limited to:
- Revise Recommendations G.661, G.662, G.663 and G.671
- Prepare new Recommendations as required including G.pmdc, G.raman
Note: An up-to-date status of work under this Question is contained in the
SG 15 Work Programme.
- Relationships
- Recommendations:
- Questions:
- Q1/15, Q2/15, Q3/15, Q6/15 and Q8/15
- Study Groups
- ITU-T SG 6 on physical aspects of outside plant for optical amplifiers
and for active and passive optical components
- Standardization bodies, forums and consortia:
- IEC SC86B on optical passive components
- IEC SC86C on active components and dynamic components including all
types of optical amplifiers
- IEC TC76 on laser safety and aspects of safe laser operation
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