What are Etalon Filters & How are they Used in Datacoms?

Etalons are a type of Fabry–Pérot interferometer – an optical cavity made from two parallel reflecting surfaces. They can act as optical filters since only the frequencies matched to the resonant frequencies of the cavity can pass through the cavity. As a result, they...

What is a Hybrid Gain Flattening Filter (GFF)?

The rapid expansion of the World Wide Web and increased connectivity requirements have generated an explosion in optical communication systems. In optical fiber-based communications, optical signals are transported on a light wave. Each wavelength (or frequency) of...

The Basics of Long Pass Filters

Long pass filters, sometimes referred to as long pass edge filters, are designed to transmit wavelengths within a given wavelength range. This band is defined by the filter’s cut-on edge which essentially blocks frequencies shorter than the specified edge wavelength....

How Does a Dichroic Filter Work?

Dichroic filters are designed to selectively allow wavelengths within a specific transmission band to pass through while reflecting all other colors and for beam steering purposes. They are particularly useful in optical applications where the detector is...

What is a WDM Channel?

A simple approach in optical data communication is the use of a pair of optical fibers for a single channel transmission. The fiber pair provides the two directions for transmitting the data. Basically, one pair of fiber is equivalent to one data channel and the light...