  New sol-gel derived organic/inorganic hybrid single mode waveguides devices
have been developed for telecommunication applications in the two near infrared
windows at 1310 and 1550 nm. The overall procedure of fabrication of these
devices is described and the refractive indices of the guiding, the buffer and
the protective layers are adjusted by a precise control of the materials'
composition. Due to the improvement of the composition of the guiding layer,
the attenuation losses are significantly decreased to 0.8 dB/cm and 2dB/cm at
respectively 1310 and 1550 nm.
