R. Adar et al., LESS-THAN-1 DB PER METER PROPAGATION LOSS OF SILICA WAVE-GUIDES MEASURED USING A RING-RESONATOR, Journal of lightwave technology, 12(8), 1994, pp. 1369-1372
Phosphorus doped silica on silicon waveguide propagation loss, bend lo
ss and their polarization dependence have been measured using a set of
different radii ring resonators. For a 30-mm ring radius a finesse of
132 was measured and the inferred propagation loss was 0.85 dB/m, the
lowest value yet reported. To characterize the finesse of the high Q
resonator we proposed and used for the first time a stable Er+3 fiber
grating laser source which was thermally tuned. This configuration pro
vides improved and accurate measurements capability for finesse values
in the range well beyond 100.