RFUnderstanding Crosstalk in Fiber Optic Networks
fiber optic
crosstalk
optical network
wdm
isolation
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This page explains the concept of crosstalk in fiber optic networks.
The undesired coupling from one channel to another is referred to as crosstalk. This phenomenon is illustrated in Figure 1.
Far End Crosstalk
Far End Crosstalk is defined as the ratio of optical power from output port-1 to output port-2, assuming both ports operate at the same wavelength.
Normally, port-2 is isolated from port-1. Crosstalk is typically expressed in dB.
In WDM (Wavelength Division Multiplexing) systems, the signals in the two output ports will have different wavelengths. In this case, the term “isolation” is used instead of “far end crosstalk” to describe the separation between the signals.
