PLC-Based Pulse-Train Generators

Novel planar-lightwave-circuit-based pulse-train-generator devices designed for use as repetition-rate multipliers are experimentally investigated. In addition to arrayed waveguide grating-based pulse-train generators and loss-engineered devices which have been previously demonstrated, novel excitation-engineered structures are described which illuminate design constraints that impact the practical implementation of various device designs

I. Introduction

Miniaturization and loss minimization have fueled the development of planar lightwave circuits (PLCs), where semiconductor industry initiated tools (namely photolithography and reactive-ion etching) are applied to the fabrication of optical devices [1] –[3]. PLC-based fabrication is frequently employed in a wide range of devices such as power splitters, tapped delay lines, and arrayed waveguide gratings (AWGs). Although the range of applications utilizing PLC-based devices is enormous, the focus of this paper will be on experimental demonstrations of PLC-based devices designed for optical pulse repetition-rate multiplication applications.