Wavelength-adaptable optical phased array in SiO/sub 2/-Si

Abstract

An optical phased array in the silica-on-silicon material system (SiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -Si) with 8-nm channel spacing in the 1.5-μm wavelength region is reported. The device exhibits quasi-polarization independent operation with insertion losses of 2.5-3 dB and crosstalk attenuations of >20 dB. It can be adapted to the specified center wavelength simultaneously with the adjustment of the input fiber.