Simulation of grating spectrometers constitutes the problem of propagating a spectrally broad light field through a
macroscopic optical system that contains a nanostructured grating surface. The interest of the simulation is to quantify
and optimize the stray light behaviour, which is the limiting factor in modern high end spectrometers. In order to
accomplish this we present a simulation scheme that combines a RCWA (rigorous coupled wave analysis) simulation of
the grating surface with a selfmade GPU (graphics processor unit) accelerated nonsequential raytracer. Using this, we are
able to represent the broad spectrum of the light field as a superposition of many monochromatic raysets and handle the
huge raynumber in reasonable time.
Future high-speed optical communications networks operating at data rates in excess of 100Gbit/s per channel will require a sensitive and ultrafast technique for precise optical signal monitoring. The standard way of characterising high-speed optical signals to use a fast photodetector in conjunction with a high-speed oscilloscope. However, this method is limited to a maximum data rate of approximately 40Gbit/s. An alternative is to employ all-optical sampling techniques based on ultrafast optical nonlinearities present in optical fibres, optical crystals and semiconductors. One such nonlinearity is the optical-to-electrical process of Two-Photon Absorption (TPA) in a semiconductor. This paper presents an optical sampling technique based on TPA in a specially designed semiconductor microcavity. By incorporating the microcavity design, we are able to enhance the TPA efficiency to a level that can be used for high-speed optical sampling.
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