Spectral Dependence of Propagation Loss in InP/InGaAsP ARROW Guides Grown by Chemical Beam Epitaxy.

We present direct measurements of low propagation loss in InP- core Anti-Resonant Reflecting Optical Waveguides (ARROWs) at wavelengths that are strongly absorbed in the directly adjacent InGaAsP reflector layers. With 1.54-microns-luminescence-peak InGaAsP reflector layers, losses range from a low value of ~0.9 dB/cm at 1.67microns to ~6.5 dB/cm at a wavelength of 1.515microns for which the reflector layer losses approach 10(4)dB/cm. This proves the suitability of the ARROW geometry for providing for large mode, low propagation loss guides for wavelengths that may either be generated, experience gain, or absorption within the reflector layers.