The key parameters and criteria of eye diagram testing in optical transceivers, focusing on how metrics like eye height, eye width, jitter, and extinction ratio affect signal quality, and highlights the critical role of mask margin in evaluating performance and standards. The key parameters and criteria of eye diagram testing in optical transceivers, focusing on how metrics like eye height, eye width, jitter, and extinction ratio affect signal quality, and highlights the critical role of mask margin in evaluating performance and standards. Structure of Eye Diagrams and Introduction to Key Parameters The key parameters of an eye diagram include: Extinction Ratio, Jitter, Crossing Ratio, Rise Time, Fall Time, and Margin. 1 Extinction Ratio The extinction ratio is defined as the ratio of the power of the "1" level. This instrument class measures samples of the input signal to form an eye diagram that can be used for analysis of the signal's noise, jitter, and eye mask compliance. Depending on the rate. Eye Width is the horizontal distance between the two crossing points of the eye diagram, defined as the time difference between the points where the upper and lower edges intersect (Crossing Points).