This document describes two methods for determining and measuring the information transmission capacity of TIA/EIA-4920000-B Class I (glass core) multi-mode optical fibers. The baseband frequency response is directly measured in the frequency domain by determining the fiber response to a sinusoidally modulated light source. The baseband response can also be measured by observing the broadening of a narrow pulse of light. The two methods are:

Method A – Optical Time Domain Measurement Method (Pulse Distortion)

Method B – Frequency Domain Measurement Method

Each method can be performed using one of two launches: an overfilled launch (OFL) condition or a restricted mode launch (RML) condition.

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

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