Animated Optical Glossary
Search a term
 

Polarization Mode Dispersion (PMD)


PMD at a Glance

A form of dispersion where the two polarization states of light travel at slightly different velocities causing the optical pulse to statistically spread and possibly get distorted in the time domain. When the broadening becomes too wide, the pulses overlap and produce inter-symbol interference, increasing the bit error rate. PMD is characterized by the frequency or wavelength and varies according to the index of refraction (i.e., index of propagation) of the medium. Since PMD is related to the propagation axes, it leads to birefringence.

Watch PMD E-Learning Video

e-Learning generic Thumbnail


Resources

Related Products

Here are the products families and other products related to this article

Related Solutions

Network Expansion: Up to 100G Testing

Network Expansion: Up to 100G Testing

As bandwidth demands continue to increase, network service providers are looking at 40 Gigabit Ethernet and 100 Gigabit Ethernet networks to accommodate the ongoing traffic surge. 


Deploying 40G/100G Submarine Networks with the Right Solutions

Deploying 40G/100G Submarine Networks with the Right Solutions

Packet traffic on submarine networks is steadily on the rise and submarine network operators must meet exacting services while optimizing performance.


Packet Optical Transport—A Viable Solution to Network Expansion

Packet Optical Transport—A Viable Solution to Network Expansion

Packet optical transport (POT) networks are optical super-highways that use the most advanced technological enablers, from reconfigurable optical add/drop multiplexers (ROADMs) to amplifiers—and from very high bit rates to dense wavelength-division multiplexers (WDMs).


Related Resources

Sort by:

When upgrading a channel to a higher bit rate, chromatic dispersion (CD) and polarization mode dispersion (PMD) must be characterized because they will impact transmission performance. The FTB-5700 Single-Ended Dispersion Analyzer allows one technician to understand and assess metro network weaknesses. 

Last updated: 2012-06-05

This application note explains why it is important to test for chromatic dispersion and polarization mode dispersion, especially with the penetration of 40 Gbit/s, or OC-768/STM-256.

Last updated: 2011-08-22