(Continuation of Question 7/15 and Question 9/6)
The increasing complexity of optical networks has brought about an increasing
diversity of active, passive and hybrid or dynamic/adaptive optical components,
devices and related network infrastructure equipment. These components, devices
and network infrastructure equipment find applications in local access networks,
metropolitan and long distance networks, and in submarine networks. Functions
differ with the application. This Question addresses the high level need for
specifications 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.665, G.666,
G.667, G.671, L.12, L.13, L.18, L.31, L.36, L.37, L.45, L.46, L.50, L.51, L.54,
Note: proposal to move Recommendation L.45 and L.46 to question 19/15 is
What components aspects and desirable characteristics need to be specified to
support local access networks, metropolitan and long distance networks, and
submarine networks in the OTN?
What enhancements should be made to existing draft or published
Recommendations to reflect technological developments and requirements?
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, polarization, dispersion, noise and
- 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 other optical amplifier sub-systems (e.g. those resulting
from integration of optical amplification with optical multiplexing or
- Specification of components for present and future optical networks, such
as OAs with transient control, gain-flattened OAs and wideband OAs, optical
circulators, optical modulators, electrically controlled optical
attenuators, passive and active dispersion compensators including
Polarization 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 robust optical transmission systems
including advanced modulation formats for 40 Gbit/s and above 100 Gbit/s.
- 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 and
Optical Network Elements (ONEs) containing 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.
- Components and subsystems for the All Optical Network (AON), e.g. AOWC
(All optical wavelength converter), Optical 3R (Optical 3R Regenerator),
Optical 2R (Optical 2R Regenerator), tunable components, Optical Amplifiers
with transient control).
- Enhanced dynamic compensation for both, chromatic dispersion and PMD.
- Specification of fixed Optical Add/Drop Multiplexer (OADM) and
re-configurable Optical Add/Drop Multiplexer (ROADM) and OXC (Optical
- New components and subsystems for the metro and the access networks.
- Components and subsystems for Optical Packet Switching.
- 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
- Enhancements that can be made to existing draft and published
Recommendations to further reduce the power consumption of optical
components and subsystems.
- Optical infrastructure for the FTTH networks, including:
- Optical Distribution Frames
- Outdoor closures and cabinets
- Indoor and Outdoor distribution terminals
- Customer terminals and pre-terminated drop cables
- Indoor cabling solutions
- Enclosures and joints related to optical and copper networks
- Storage, protection and thermal management of active electronics in
outside plant locations.
Specific tasks include, but are not limited to:
- Revise Recommendations G.661, G.662, G.663, G.665, G.666, G.667 G.671,
L.50 and L.51.
- Create new Recommendations on:
- Customer end distribution boxes and terminals (new ITU Rec. L.Distr)
- Outdoor optical cross connect cabinets (new ITU-T Rec. L.Oxcon)
- Pre-terminated Fibre drop cables & hardened connectors (new ITU-T Rec. L.Drop).
NOTE: An up-to-date status of work under this Question is contained in the
SG15 Work Programme at http://www.itu.int/ITU-T/workprog
- G.6xx and G.9xx Series.
- L.xx Series
- Q1/15, Q2/15, Q3/15, Q5/15, Q6/15, Q8/15, Q16/15, Q17/15, Q18/15, Q19/15.
Standardization bodies, forums and consortia:
- ITU-T SG5
- 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.
- IEC TC46 on cables, wires, waveguides, R.F. connectors, R.F. and microwave
passive components and accessories