Stefan Goeman

First demonstration of highly reflective and highly polarization selective diffraction gratings (GIRO-gratings) for long-wavelength VCSELs

We present experimental results on surface relief gratings in GaAs and InP with high reflectivity (>85%) and polarization selectivity to normal incidence from the semiconductor side. The potential for polarization stabilization with a reduced mirror complexity for long-wavelength VCSELs is discussed.

Experimental demonstration of high TM reflectivity in GaAs based GIRO-gratings in the wavelength region of 9-11 /spl mu/m

In this paper we present the first experimental result of the GIRO-principle (giant reflectivity to 0 order) showing a semiconductor-air diffraction grating with high TM reflectivity and low TE reflectivity under normal incidence, as predicted by theory.

An integrated optical add/drop multiplexer in InP based on elliptic couplers and Bragg grating reflector

The wavelength add/drop multiplexer (ADM) is one of the key components for dense wavelength division multiplexing (DWDM) systems. To realise this function, a number of schemes have been proposed and tested based on planar waveguide circuits or optical fibers, such as the planar waveguide based grating-folded directional coupler ADM, fiber based ADMs using Mach-Zehnder interferometer structure and photoimprinted Bragg gratings and so on. We proposed a new add/drop scheme based on elliptic beam collimators and Bragg gratings realised in InP. In this paper, we will report the device design, fabrication and the preliminary experimental results.