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.
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
In this article we’ll take a more in-depth look at GPON technology, including the latest 10G PON standards (XG-PON and XGS PON) and NG-PON2.
Read more >With the continuing need for access to higher bandwidths for residential and business users, PON continues to be important for Fiber to the Home (FTTH) and Fiber to the Building (FTTB). Read the blog to find out more.
Read more >Read about the different types of laser which are the key component of fiber optical transceivers, affecting cost and transmission distance.
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