Low polarisation dependence (< 0.3 dB) in anEA modulatorusing a polyimide-buried high-mesa ridge structurewith an InGaAsP bulk absorption layer

Abstract
The electroabsorption modulator combining a polyimide-buried high-mesa ridge structure with an InGaAsP bulk absorption layer which the authors have developed demonstrates an extremely low polarisation-dependent loss of less than 0.3 dB with a practical and sufficient attenuation of 20 dB.