(Continuation of Questions 17 and 19/15)
Background and justification
The increasing complexity of optical networks has brought about
an increasing diversity of active and passive 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,
whether uni-directional or bi-directional, point-to-point or
point-to-multipoint, single or multiple wavelengths, with or
without optical amplification.
The responsibility under this Question includes the following
Recommendations:
G.661: Definition and test methods for the relevant generic
parameters of optical amplifiers
G.662: Generic characteristics of optical amplifier devices
and sub-systems
G.663: Application-related aspects of optical amplifier
devices and sub-systems
G.671: Transmission characteristics of optical components
and subsystems
Question
- What components aspects and 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
Study items to be considered include:
- Active devices and sub-systems such as optical
fibre amplifiers (OFAs), including parameter definitions and
measurement (IEC test methods), 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 characteristics
in multichannel applications including their frequency
equalization and dynamic response
- Semiconductor optical amplifiers
- 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 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;
- Possible extension of OFAs, components and
subsystems for use in bi-directional transmission systems on a
single fibre
- OFAs other than 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
- 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 WDM, including optical label
switching components
Specific tasks and deadlines
- Revise Recommendations G.661, G.662, G.663 (2004)
and G.671 (2003).
- Prepare new Recommendations as required
Relationships
- ITU-T SG 13 on IP related issues
- ITU-T SG 6 on physical aspects of outside plant for
optical amplifiers and for active and passive optical components
- IEC TC86 and its sub committees on optical passive
components, on dispersion compensator specifications and on
optical fibre amplifiers, and on semiconductor optical
amplifiers
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