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HomeFreeWhat is an Eye diagram?
eyediagram

What is an Eye diagram?

Last Updated: August 16, 2025
1 min read
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What is an eye diagram?

An eye diagram is an overlay of all possible received bit sequences, e.g. the sum of…

What is an Eye diagram - Image 1

Note: should really be an overlap of “infinitely long” bit sequences to get a true eye.  This catches all potential inter-symbol interference

results in…

(the above is considered to be an “open” eye)

 Eye diagrams can be used to evaluate distortion in the received signal, e.g. a “closed” eye

What is an Eye diagram - Image 2

Note:More the wide open eye more the network is error-free

Sanjay Yadav

Optical Communications & Network Automation Expert | Author of 3 Books for Optical Engineers | Founder, MapYourTech

Optical networking engineer with nearly two decades of experience across DWDM, OTN, coherent optics, submarine systems, and cloud infrastructure. Founder of MapYourTech.

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