Certified Fiber Optics Practice Exam 2025 – All-in-One Guide to Mastering Your Certification!

Question: 1 / 400

A loss of 3 dBm indicates what percentage of power loss?

25%

50%

A loss of 3 dBm corresponds to a specific percentage of power loss that can be determined using logarithmic and exponential relationships in power measurements.

In the context of dBm, 0 dBm is defined as 1 milliwatt (mW) of power. Each 10 dBm increase represents a tenfold increase in power, while each decrease represents a tenfold reduction. The formula to convert dBm to a linear power ratio involves calculating the power ratio in terms of mW.

When we have a loss of 3 dBm, it means that we are looking at a decrease of power from the original level. A loss of 3 dBm can be calculated as follows:

1. The linear power ratio corresponding to a -3 dBm loss is determined by the formula:

\[

P_{\text{new}} = P_{\text{original}} \times 10^{\left(\frac{-3}{10}\right)}.

\]

2. This results in approximately:

\[

P_{\text{new}} = P_{\text{original}} \times 0.707.

\]

This indicates that the new power level is about 70.7% of the original

Get further explanation with Examzify DeepDiveBeta

75%

10%

Next Question

Report this question

Download Certified Fiber Optics Practice Exam PDF Study Guide
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy