TDEC metric in 50G-PON: analytical and experimental investigation on several implementation aspects

We analyze the metrology of transmitter and dispersion eye closure (TDEC) as defined in a 50G passive optical network (50G-PON) for assessing transmitter quality. First, we present a theoretical evaluation for adapting TDEC to 50G-PON, where equalized bandwidth limited avalanche-photodiode-based receivers are expected. We optimize the parameters for a proper numerical evaluation and provide some guidelines for implementing the metric. We also show that TDEC can be measured with both sampling and real-time oscilloscopes provided that there are enough samples for the latter. A comparison of two techniques, one noiseless and one considering noise enhancement, for computing the coefficients of the equalizer is also provided. Finally, an experimental comparison between a Mach-Zehnder modulator and an electroabsorption-modulated-laser-based transmitter is carried out with different extinction ratios and fiber lengths, showing that TDEC can effectively predict the receiver sensitivity penalty.

Automated summary

This paper analyzes the metrology of transmitter and dispersion eye closure (TDEC) in a 50G passive optical network (50G-PON) for evaluating transmitter quality. The theoretical evaluation for adapting TDEC to 50G-PON is presented, along with optimization of parameters for numerical evaluation and guidelines for implementation. The measurement of TDEC is demonstrated using both sampling and real-time oscilloscopes, with a comparison of noiseless and noise-enhanced techniques for computing equalizer coefficients. Experimental comparisons between different transmitters show that TDEC can effectively predict receiver sensitivity penalty.