| Work group:
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Q5/15 (Presentation Web page is available here)
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| Title:
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Characteristics and test methods of optical fibres and cables, and installation guidance
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| Description:
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1 Motivation
Optical fibre cables have been specified and deployed in telecommunication networks worldwide, finding wide application in access, intra/inter-office, intra/inter-data centre (DC), metropolitan, long-haul, and submarine networks. New optical fibre technologies and new applications continue to drive the need for additional specifications. For example, the IoT, advanced mobile services, edge computing, cloud/distributed data management, artificial intelligence/machine learning (AI/ML), distributed optical fibre sensing, and other relevant technologies called out in support of IMT 2020/5G and the evolution to IMT 2030/6G may require new features and/or functions from the optical fibre network. Moreover, increased transmission speeds and bandwidth requirements across the optical network supporting a variety of services will likely require a new class of optical fibre that can substantially expand the transmission capacity and/or channels supported by a traditional single-mode fibre.
One important set of issues to be studied is related to the network infrastructure used to connect the customer. The choice of infrastructure type, cables and outside plant components is strictly dependent on the topology chosen as well as on the installation conditions (presence of infrastructures or need to construct new ones).
For this purpose, new optical cables, including optical/electrical hybrid cables, new cable constructions and installation techniques for outside plant construction and operation will be required. Cable installation in existing buildings without specific available infrastructure for these new elements and/or cable installation in intra/inter-office/DC with increasing density will be a challenge, and technical solutions for wiring customer premises and/or offices/DCs with minimum disturbance to the customer need to be identified, such as miniaturized/ultra-high-density cables and devices, pre-assembled solutions etc.
The responsibility under this Question includes the following areas of standardization:
- Description and testing of basic single- and multi-mode fibre types and associated optical fibre cables, with parameter tables describing the variations within each of the basic types.
- Description of installation techniques for cabled optical fibres in the optical transport network (OTN) network, access network, inter/intra DC network, and user premises.
- Definitions of attributes and associated test methods for environmental, electrical, biotic, geometrical, transmission, mechanical and reliability characteristics of cabled optical fibres.
- Descriptions of different possible fibres and/or cables solutions for OTN, access, DC, and submarine networks.
- Descriptions of the dependencies between the different cable attributes and the relationship of those attributes to variations in the environment.
- The following major Recommendations and supplements, in force at the time of approval of this Question, fall under its responsibility:
o Optical fibres: G.650.1, G.650.2, G.650.3, G.651.1, G.652, G.653, G.654, G.655, G.656, G.657, G-series Supplements 40, 47 and 59, and GSTR-SDM.
o Optical fibre cables:
o L.100/L.10, L.101/L.43, L.102/L.26, L.103/L.59, L.104/L.67, L.105/L.87, L.107/L.78, L.108/L.79, L.109/L.60, L.109.1, L.110, L.111 for cable structure and characteristics,
o L.126/L.27 for cable evaluation, and
o L.150/L.35, L.151/L.34, L.152/L.38, L.153/L.48, L.154/L.49, L.155/L.83, L.156/L.57, L.157/L.61, L.158/L.56, L.159/L.77, L.160/L.82, L.161/L.46, L.162, L.163 for guidance and installation technique.
2 Questions
Study items to be considered include, but are not limited to:
- What fibre characteristics are needed to:
o Improve performance limits of optical fibres for next generation transmission systems such as beyond 100 Gbit/s per wavelength for both intensity modulated-direct detection IM-DD and digital coherent technologies?
o Support coarse or dense wavelength division multiplexing (CWDM/DWDM) applications in access (including to and in home/building), metropolitan (including intra/inter office), long-haul and submarine networks?
o Support space division multiplexing (SDM) applications?
o Open new spectral transmission regions as the additional passband?
NOTE 1 ? Some of these aspects are, at present, covered also in Q2/15, Q6/15 and Q8/15 so coordination is necessary.
- What is needed to provide cost-effective optical access (including to and in home/building), mobile front/back-haul, metropolitan (including intra/inter-office/DC), long-haul and submarine networks?
- How can cohesive Recommendations on optical cabling in these application areas be formulated including, but not limited to:
o The impacts of cable construction and cable installation on fibre characteristics?
o The impacts of hardware, such as splicing trays, customer outlets, enclosures, connectors etc, on fibre and cable characteristics?
o The impacts of cable construction and installation on handleability and mechanical reliability?
o The requirements for testing and maintenance in the field?
NOTE 2 ? Some of these aspects are, at present, also covered in Q7/15 and so coordination is necessary.
- What study items should be considered including, but not limited to:
o Geometrical, mechanical, and optical properties of the glass, for single-mode and SDM optical fibre applications?
o Mechanical and optical reliability of fibres and cables (lifetime and failure rate) under different installation and environmental conditions?
o Modelling, and measurements of polarization mode dispersion (PMD) under advanced cable structure, e.g., high density cable structure, and/or particular environment?
o Impact of network deployment conditions on optical characteristics, e.g., multi path interference (MPI), PMD, cut off wavelength, distributed Raman amplification and so on particularly for high density cable structure?
o Possible additional fibre types, and additional parameter tables, within the existing Recommendations?
o Other types of single-mode silica fibres optimized for higher bitrates (e.g., beyond 100 Gbit/s) CWDM/DWDM systems for both IM-DD and digital coherent technologies?
o Other types of single-mode silica fibres for opening new spectral transmission regions?
o Other types of single-mode silica fibres for reducing non-linearity effects?
o Fibre damage from high power and small bend radii?
o Fibre and cable requirements for parallel transmissions, including SDM, on either CWDM or DWDM on single-mode or SDM optical fibres?
o Fibre and cable requirements for supporting the advanced access and mobile networks?
o Define a "degree of compatibility" between the different types of fibres installed in the same link in order to estimate the transmission characteristics?
o Fibre parameters for the monitoring of the transmission wavelength region?
o Aspects and/or guidance of measurements in the field related to point-to-point and point-to-multipoint topologies?
o Optimal methods to enter the user premises and for installing optical fibre cables and other network elements in common parts of the buildings?
o Desirable optical fibre cable construction types for wireless, indoor and outdoor cabling applications?
o Desirable hybrid/composite cable construction types?
o Suitable techniques to connect the OTN, access network, and customer premises network?
o Suitable techniques to construct the fibre network inside premises?
o Suitable technologies to connect "smart city" physical infrastructure?
3 Tasks
Tasks include, but are not limited to:
- Maintenance and enhancements of G.65x-series including modifying parameters in Recommendations G.651.1, G.652, G.653, G.654, G.655, G.656, and G.657.
- Updating the text of G-series Supplements 40, 47 and 59, and GSTR-SDM as required.
- Developing new Recommendations or parameter tables within existing Recommendations for possible additional fibre and cable types.
- Developing definitions of new parameters, and corresponding factory and field test methods, reference and alternative test methods (RTMs and ATMs), for G.650.1, G.650.2, and G.650.3.
- Developing new link design methodologies to support new transmission strategies in bit new and installed links.
- Maintain and enhance L.100 series including modifying parameters in existing Recommendations L.100-L.199.
- Develop guidelines for users of optical fibres and cables.
- Develop cohesive Recommendations on cabling.
- Optical fibre and cable aspects related to installation of OTN, access, mobile, and home networks.
- Installation of cables inside home/building and intra/inter-office/DC.
- Solutions for connection between external and internal networks.
- Characteristics and test methods for vertical cabling in buildings.
- Impact of optical fibre cable installation on the city environment.
An up-to-date status of work under this Question is contained in the SG15 work programme (https://www.itu.int/ITU-T/workprog/wp_search.aspx?sp=18&q=5/15).
4 Relationships
Recommendations:
- G.67x-, G.69x-, G.95x-, G.97x-, G.98x-, L.200-series, L.300-series, and L.400-series Recommendations
Questions:
- 2/15, 6/15, 7/15, 8/15
Study Groups:
- None
Other bodies:
- ISO/IEC JTC1/SC25 on multimedia cabling for customer premises
- IEC SC86A on fibres and cables
- IEC SC86B on connectors and components
- IEC SC86C on system testing and active devices
- IEC SC46C JWG8 with IEC SC86A on hybrid cables (IEC62807-series)
- CENELEC TC86A on fibres and cables
- CENELEC TC86BXA on connectors and components
- IEEE 802.3 on Ethernet transmission
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| Comment:
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Continuation of Q5/15
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Rapporteur:
| Mr. | Kazuhide | NAKAJIMA |
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Associate rapporteur:
| Mr. | Vincent | FERRETTI |
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