OSNR improvement by introducing intra-node arrayed optical amplifiers into multi-degree ROADM

Abstract

We propose an intra-node arrayed optical amplifier (AOA) to improve the OSNR of received signals by reducing the insertion loss of multi-degree ROADM nodes. Our AOA shares a pump laser between several EDFAs with the aim of reducing the module size and manufacturing cost compared with the size and cost when only arraying discrete EDFA modules. We confirmed the feasibility of our fabricated AOA experimentally. The experimental results show that the pump power was properly distributed to each EDFA and the OSNR of the received signals was successfully improved for 128-Gbit/s PDM-QPSK signal transmission systems.