TIA-455-204-A:2013

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FOTP-204 Measurement of Bandwidth on Multimode Fiber

Published By	Publication Date	Number of Pages
TIA	2013	36

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Description

This part of IEC 60793 describes three methods for determining
and measuring the modal bandwidth of multimode optical fibres (see
IEC 60793-2-10, IEC 60793-30 series and IEC 60793-40 series). The
baseband frequency response is directly measured in the frequency
domain by determining the fibre response to a sinusoidaly modulated
light source. The baseband response can also be measured by
observing the broadening of a narrow pulse of light. The calculated
response is determined using differential mode delay (DMD) data.
The three methods are:

Method A – Time domain (pulse distortion) measurement
Method B – Frequency-domain measurement
Method C – Overfilled launch modal bandwidth calculated from
differential mode delay (OMBc)

Methods A and B can be performed using one of two launches: an
overfilled launch (OFL) condition or a restricted mode launch (RML)
condition. Method C is only defined for A1a.2 (and A1a.3 in
preparation) multimode fibre and uses a weighted summation of DMD
launch responses with the weights corresponding to an overfilled
launch condition. The relevant test method and launch condition
should be chosen according to the type of fibre.

NOTE 1 These test methods are commonly used in production and
research facilities and are not easily accomplished in the
field.

NOTE 2 OFL has been used for the modal bandwidth value for
LED-based applications for many years. However, no single launch
condition is representative of the laser (e.g. VCSEL) sources that
are used for gigabit and higher rate transmission. This fact drove
the development of IEC 60793-1-49 for determining the effective
modal bandwidth of laser optimized 50 mm fibres. See IEC
60793-2-10:2004 or later and IEC 61280-4-1:2003 or later for more
information.

Additional information