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Singlemode Fiber Types
There are several designations used to describe various types of singlemode fiber that are often confusing. Here are the ones in common use today.
Description IEC SMF Type ITU Spec. TIA Spec
Standard Singlemode Fiber B1.1 G.652 TIA 492CAAA / OS1
Cutoff Shifted Fiber B1.2 G.654
Low Water Peak Fiber B1.3 G.652 TIA 492CAAB / OS2
Dispersion Shifted Fiber B2 G.653
Non-Zero Dispersion Shifted Fiber B4 G.655
TIA-492E000 / TIA-492EA00
The standards bodies with vested interest in the governance of optical fiber specifications are:
ISO (International Organization for Standardization) – Formed of manufacturers and standards bodies representing over 90 nations. For optical fiber specifications and standards, ISO and IEC collaborate on several Joint Technical Committees (JTC).
IEC (International Electrotechnical Commission) – IEC addresses the electronics and telecommunications industries, and counts over 50 nations among its membership. The current IEEE 802.3 standard for Ethernet cites TIA-568 and ISO/IEC 11801 for optical fiber specifications.
TIA (Telecommunications Industry Association) – Now part of the Electronic Industries Alliance (EIA). TIA is comprised of manufacturers who are primarily suppliers to the telecom industry but include other interested groups. TIA is primarily involved (through the American National Standards Institute or ANSI) in optical fiber and system test standards.
ITU (International Telecommunication Union) – The ITU is part of the United Nations System of Organizations, and over 180 countries currently are represented within the ITU. The ITU administers the commonly referenced single-mode fiber standards documents, G.652 through G.655, as required by telecom systems manufcturers and their customers.