TIA-455-191-B:2003 (R2013)

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FOTP-191 IEC-60793-1-45 Optical Fibers – Part 1-45: Measurement Methods and Test Procedures – Mode Field Diameter

Published By	Publication Date	Number of Pages
TIA	2003	40

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Description

This part of IEC 60793 establishes uniform requirements for
measuring the mode field diameter (MFD) of optical fibre, thereby
assisting in the inspection of fibres and cables for commercial
purposes.

The MFD represents a measure of the transverse extent of the
electromagnetic field intensity of the mode in a fibre cross
section, and it is defined from the far-field intensity
distribution as a ratio of integrals known as the Petermann II
definition. See equation (1).

The definitions of MFD are strictly related to the measurement
configurations. The mathematical equivalence of these definitions
results from transform relationships between measurement results
obtained by different implementations summarized in figure 1 as
follows:

Four methods are described for measuring MFD:

– method A: direct far-field scan;

– method B: variable aperture in the far field;

– method C: near-field scan;

– method D: bi-directional backscatter using an optical time
domain reflectometer (OTDR).

All four methods apply to all categories of type B single-mode
fibre shown in IEC 60793- 2 and operating near 1 310 nm or 1 550
nm. Method D is not recommended for the measurement of fibres of
unknown type or design.

Information common to all four methods is contained in clauses 1
to 8, and information pertaining to each individual method appears
in annexes A, B, C and D, respectively.

Additional information