Very low-loss GeO 2 -doped silica waveguides fabricated by flame hydrolysis deposition method

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Abstract
GeO2-doped silica single-mode waveguides are fabricated by flame hydrolysis deposition and reactive ion-etching methods, and the loss value measured using a 40 cm long waveguide circuit. The fabricated single-mode waveguides with fourteen 90° bends with a small bending radius of 5 mm have a very low loss value of 0.04 dB/cm, leading to an estimated propagation loss in the straight waveguides part of (0.01 ± 0.01)dB/cm.