INTERNATIONAL  TELECOMMUNICATION  UNION
ITU-T
G.652
TELECOMMUNICATION
STANDARDIZATION  SECTOR
OF  ITU
(03/2003) 
SERIES G: TRANSMISSION SYSTEMS AND MEDIA, DIGITAL SYSTEMS AND NETWORKS
Transmission media characteristics – Optical fibre cables
Characteristics of a single-mode optical fibre and cable
CAUTION !
PREPUBLISHED  RECOMMENDATION
This prepublication is an unedited version of a recently approved Recommendation. It will be replaced by the published version after editing. Therefore, there will be differences between this prepublication and the published version.

FOREWORD
The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis.
The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITUT study groups which, in turn, produce Recommendations on these topics.
The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1.
In some areas of information technology which fall within ITU-T's purview, the necessary
standards are prepared on a collaborative basis with ISO and IEC.
NOTE
In this Recommendation, the expression "Administration" is used for conciseness to indicate both a telecommunication administration and a recognized operating agency.
INTELLECTUAL PROPERTY RIGHTS
ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process.
As of the date of approval of this Recommendation, ITU [had/had not] received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the l
atest information and are therefore strongly urged to consult the TSB patent database.
©  ITU  2003
All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU.

Recommendation G.652
CHARACTERISTICS OF A SINGLE-MODE OPTICAL FIBRE AND CABLE
Table – 1 Revision summary
Revised item
Outline of revision
Summary
Modified at the request of TSAG
Source and history
Added history.
Revised terms of “base subcategory” and “subcategory” to “base category” and “category”.
Title
Changed title to “Characteristics of a single-mode optical fibre and cable”
Source and history
Added text with a warning to refer to previous versions for older fiber
1. Scope
Added G.693 as applications.
Changed description of L band upper limit from 16xx to 1625
Modified para 3 to give a simple list of Recommendation supported
2
Modified introductory text to be identical to the recent template.
2.1 Normative references
Changed G.650 to G.650.1 and G.650.2
Added IEC 60793-2-50
2.2 Informative references
Added G.693 as an informative reference.
Added G.959.1 as an informative reference
4 abbreviations
Added PMDQ to the list
Delete n2/Aeff
General
Changed “band” to “wavelength range”
5.6
Deleted note 4 on macrobending loss and renumbered notes 5 and 6
Deleted para. 2
6.1
Changed references for attenuation spectral model to G.650.1 following the deletion of Appendices II and III
6.2
Changed reference to PMD statistics to Appendix IV of G.652.2
Added three notes on limitations
7
The introduction of this clause is modified and the introduction of each individual table is deleted.
7 all tables
Changed macrobend radius to 30 mm
Delete 1550 requirement on Table 2,3,4
7 Table of recommended value
Table 1
Table 2
Table 3
Revised terms of “base subcategory” and “subcategory” to “base category” and “category”.
Added G.693 as an application in Tables 2 and 3.
Transformed NOTE to Footnote in each table in accordance with ITU-T A.1500.  Added the following to note 2: In this case, the cable cut-off wavelength should not exceed 1250 nm
Generalised the attenuation requirement to a wavelength range
Table 1
Added PMD requirement:  0.5
Table 2
Changed PMD requirement: 0.5 to 0.20
Table 4
Added Table: same as Table 3 but PMD: 0.20
Appendix I Information for link attribute and system design
Changed description of “typical values of optical fibre cable” to “typical values of optical fibre link” in the 3rd paragraph and I.1.
Revised typical link value of attenuation coefficient from 0.28 dB/km to 0.275 dB/km in Table I.1.
Changed description of L band upper limit from 16xx to 1625 in Table I.1.
Transformed NOTE to Footnote in Table I.1 in accordance with ITU-T A.1500.
I.4 included reference to G.650.2.
Added new footnote, which explains typical link value of attenuation coefficient, in Table I.1.
Added footnote, which explains indicates a pointer to 10 Gigabit Ethernet
Removed DGD from Table I.1
Created new Table, I.2 for DGD implications
Appendices II and IIIreference group
Deleted Spectral modeling appendices
Appendix IV
Deleted appendix on PMD statistics

ITU-T RECOMMENDATION G.652
CHARACTERISTICS OF A SINGLE-MODE OPTICAL FIBRE AND CABLE
Summary
This Recommendation describes the geometrical, mechanical, and transmission attributes of a single-mode optical fibre and cable which has zero-dispersion wavelength around 1310 nm.  This fibre was originally optimized for use in the 1310 nm wavelength region, but can also be used in the 1550 nm region.  This is the latest revision of a Recommendation that was first created in 1984.  This revision creates new categories of the fibre having a reduced PMD link design value of 0.20 ps/km, in order to accommodate systems with higher bit rate/distance products than had been possible with prior revisions.  This revision is intended to maintain the continuing commercial success of this fibre in the evolving world of high-performance optical transmission systems.
Source and history
1984 ITU-T Recommendation G.652 was created by Study Group 15 (1981-1984)
1988 ITU-T Recommendation G.652 was revised by Study Group 15 (1985-1988).
1992 ITU-T Recommendation G.652 was revised by Study Group 15 (1989-1992).
1996 ITU-T Recommendation G.652 was revised by Study Group 15 (1993-1996).
2000 ITU-T Recommendation G.652 was revised by Study Group 15 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure in October 2000.  This revision includes the addition of tables for different levels of system support.
2003    ITU-T Recommendation G.652 was revised by Study Group 15 (2001-2004) and was approved as the sixth version, under AAP procedure on XXX of 200y.  This revision clarified the nomenclature for the different categories or fibre.  Also, in accordance with the agreement on spectral band description, the upper limit of the L-band is changed from
16XX to 1625 nm.  The attenuation characteristics for reduced water peak categories, (G.652.C and G.652.D) are generalised to a broad region from a single wavelength.  PMD requirements are added for all categories and two categories have reduced limits (compared to 0.5 ps/km).  For the macrobending test, mandrel diameter is reduced to 30 mm radius.As seen above, this Recommendation has evolved considerably over the years; therefore the reader is warned to consider the appropriate version to determine the characteristics of already deployed product, taking into account the year of production.  In fact, products are expected to comply with the Recommendation that was in force at the time of their manufacture, but may not fully comply with subsequent versions of the Recommendation.

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