Acceptance of wider oblique angle of incidence in Fabry-Perot optical filter/modulator structures via index compensation in InGaAs-GaAs (980 nm) and InGaAsP-InP (1.55 μm) multiple quantum well cavities

摘要

Fabry-Perot optical filters/modulators, consisting of an InGaAs-GaAs multiple quantum well (MQW) cavity, are shown to accept wider angle of incidence (～12°) when the cavity index of refraction is compensated by an external electric field via the quantum confined Stark effect. Preliminary experimental data and simulation results on InGaAsP-InP MQW devices operating around 1.55 μm are also discussed. This provides design flexibility over conventional high finesse Fabry-Perot cavities which do not accept an angle of incidence deviation of more than 2-5° from the normal.