Tech Briefs

Measurements are accurate and repeatable from device to device and user to user.

Figure 3. Power Measurement Error in dB by rotating the fiber 360 at 5, 3, and 1mm extension fromthe holder tip.
Bare fiber testing with the holder and several ILX FPM-8210 power meters exhibited excellent repeatability in power measurements against rotational changes in the fiber and linear extension of the fiber from the tip of the holder. These factors, both of which are important in production testing of optical components, reduce the effort of an operator to position the bare fiber correctly to minimize measurement errors. This ultimately reduces the uncertainty in the measurement system. As shown in Figure 3, rotational repeatability ranged from 0.001 to 0.004 dB, while linear extension, 1 to 5 mm from the tip of the holder, exhibited a measurement repeatability of 0.001 to 0.003 dB. A statistical analysis for rotational and linear extension led to a three sigma specification of 0.003 dB power measurement repeatability. These errors are on the order of 0.0007% in the measurement.

This article was written by Thaddeus Orosz, Instrumentation Product Manager at ILX Lightwave. For more information, call Thaddeus at (406)556-2559 or email him at This email address is being protected from spambots. You need JavaScript enabled to view it.. ILX is online at

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