Tip of the Week – 17 Jul 2013

Tip of the Week – Optical Loss Measurements

A fiber optic loss measurement is correctly written without a negative sign in front of the value, since the measurement is already known to be a loss measurement. For example 10 dB loss is correct, instead of -10 dB loss. Placing a negative sign in front of the loss value would indicate a negative loss, which is a gain!

Note, this rule does not apply for absolute optical power measurements in dBm. Since in power measurements, a negative sign means the power level is below 1 mW. Where 0dBm is 1 mW, and for example -10 dBm indicates 0.1 mW of optical power.

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“Planning Fiber Optic Networks”, ISBN 0-07-1499199 available from Amazon.com . Table of contents can be seen here : http://www.TelecomEngineering.com/products/resources/planningfibernetworks.htm ,

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