OSNR Characteristics for FLEXOPTIX tunable DWDM XFP
at different datarates, Bit-Error-Rates, Rx Input Power Ranges, and dispersion levels.
(*) For all technology loving people: There is a balance or better a direct relation between Data Rate, BER (Bit-Error-Rate), Chromatic Dispersion (CD), Rx Power Range and OSNR (Optical-Signal-to-Noise-Ratio). A high gap between Signal-Level and Noise-Level results in a low BER. To achieve this big gap the input power needs to be higher than with lower BER and same OSNR. If you consider the Cromatic Disperion, too you need to have around 3-4dB more input power than without Chromatic Dispersion. This 3-4dB are known as Dispersion Penalty which has to be considered when CD is in given range. This is almost the same for all data-rates around 10G. (here 10.709-11.1 gbps) If you for example compare this with a 1G signal the OSNR can be much lower because of higher signal spacing.
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