Design of realisable optimum post‐detection filters for high data‐rate m‐PAM systems with clock jitter tolerance.

The continual increase in demand for extremely high data‐rate systems spans the full range of network systems from local area networks to long‐haul systems. While coherent optical systems dominate the long‐haul market, there is significant interest in using simpler direct detection systems for application areas, where simplicity and lower‐cost is a key driver. Pulse‐amplitude modulation (PAM) is appropriate to consider as it enables the reduction of the channel symbol rate for a given data rate, without unduly increasing the complexity of the system. A route to the design of optimum post‐detection filter for PAM systems is presented that offers significantly improved robustness to timing jitter, which is an impairment of increasing import as symbol rates are increased. [ABSTRACT FROM AUTHOR]