Follow us on LinkedIn Contact Us Optical News Become a Customer

Calculate Optical
Power Budget

Optical Power Budget

The calculation considers the optical source, wavelengths, type of fiber, distance, core diameter and lens, and a number of different parameters that affect power loss. The basics for doing the calculation are distance and damping. For example, how long is the fiber from point to point and the degree of signal attenuation. The damping is affected by the fiber cable age, which often relates to joints / welds, stations, contacts and damage. By doing measurements with an Optical Time Domain Reflectometer (OTDR), you can evaluate the fiber’s status. With the right information about the damping, you can also calculate how much you can expand your fiber network before you need to add active equipment.

Example of db-budget calculation:

 

Power budget (PB)
Least possible “transmitter power” (PT)
Least possible “receiver sensitivity” (PR)

PB = PT – PR

The equation below is in decibel (dB) with reference to 1 mW (dBm):

PB = PT – PR
PB = 0 dBm – (–16 dBm)

PB = 16 dB

Transceiver Blogs

Understanding Fiber Optic Lasers – at the heart of transceivers

Read about the different types of laser which are the key component of fiber optical transceivers, affecting cost and transmission distance.

Read more >
Transceiver Blogs

What is the difference between SFP, SFP+ and SFP28 transceivers?

We look at the different SFP transceivers available today and their suitability for different networking environments.

Read more >
Transceiver Blogs

The History of Optical Transceiver Form Factors

From GBIC to SFP-DD – read more about the development of optical transceivers and the latest innovations.

Read more >
 

Newsletter Subscribe