Experimental characterization of the reflectance of 60° waveguide bends in photonic crystal waveguides

Photonic crystal waveguides with two 60° bends were fabricated in an InGaAsP∕InP suspended membrane geometry. The transmission spectrum was measured and the reflectance of the 60° bend was evaluated from Fabry–Perot oscillations using Fourier analysis. It is shown that the reflectance agrees well with the results of a finite element method simulation.