ISI mitigation using decision feedback loop demonstrated with PMD distorted 10Gbit/s signals

Electrical polarisation mode dispersion (PMD) and receiver bandwidth generated intersymbol interference (ISI) mitigation using an analogue decision feedback loop for 10Gbit/s NRZ signals is demonstrated. ISI caused by fast-order PMD of up to 120ps differential group delay was equalised. Error free recovery of signals with completely closed eye diagrams was achieved.