InGaAsP/InP waveguide grating filters for λ=1.5 μm

Abstract
We report the first demonstration of InGaAsP/InP passive waveguide reflection grating filters. Waveguide filters with ∼1.5-μm center wavelength, peak reflectivity >99%, and spectral bandwidths (full width at half-maximum) as narrow as 6 Å and as broad as 130 Å have been achieved.