Title :
Compact versatile thermooptical space switch based on beam steering by a waveguide array
Author :
Flück, E. ; Horst, F. ; Offrein, B.J. ; Germann, R. ; Salemink, H.W.M. ; Bona, G.L.
Author_Institution :
IBM Res. Div., Ruschlikon, Switzerland
Abstract :
We present the implementation of an optical space switching concept based on thermooptic beam steering in an arrayed waveguide grating. Individual addressing of heaters on the array waveguides enables flexible switching of input signals to output waveguide channels. The switch can be used either as a 1-to-8 switch or as multiple parallel 1-to-4, 1-to-3, or 1-to-2 switches. For the implementation we used high-refractive-index SiON-SiO/sub 2/ planar waveguide technology, which allows the realization of compact devices using small bending radii. We achieved isolations of the "off\´" channels with respect to the "on" channel of up to 29 dB for a 1-to-3 switch or better than 22 dB for all "off" waveguides for a 1-to-8 switch.
Keywords :
beam steering; diffraction gratings; optical arrays; optical communication equipment; optical planar waveguides; optical switches; silicon compounds; thermo-optical effects; 1-to-3 switch; 1-to-8 switch; SiON-SiO/sub 2/; arrayed waveguide grating; beam steering; compact versatile thermooptical space switch; heaters; high-refractive-index SiON-SiO/sub 2/ planar waveguide technology; isolations; optical space switching; output waveguide channels; waveguide array; Arrayed waveguide gratings; Beam steering; Optical arrays; Optical bistability; Optical coupling; Optical switches; Optical waveguides; Phased arrays; Planar waveguides; Telecommunication switching;
Journal_Title :
Photonics Technology Letters, IEEE