Laser-fabricated delay lines in GaAs for optically steered phased-array radar

This is the authors' abstract. We don't add key points for this paper.

We have used laser direct fabrication techniques to implement optical delay lines on an epitaxial GaAs/AlGaAs substrate. These integrated photonic circuits, which are important for optically-controlled phased-array radar, include asymmetric splitters with various splitting ratios, smoothly curved 90/spl deg/ bends, as well as linear waveguides. The delay lines were tested and found to have the desired delay and a power-output uniformity of /spl plusmn/2-4%.>