Abstract

Large integrated optical circuits (IOCs) require waveguide losses of ~0.1 dB/cm for low transmission loss. For applications that involve high-Q resonator modes, such as an integrated resonator for a ring gyro or an integrated external cavity laser, waveguide loss of less than a few dB/M is desirable. Previously, Verbeek et al., measured losses of 5 dB/M in phosphosilicate glass (p-glass) core waveguides by measuring fiber-to-fiber losses in straight waveguides cleaved to different lengths.¹ Because of variations in coupling loss, it is difficult to extend this technique to provide reliable measurements of lower losses in straight waveguides.

© 1991 Optical Society of America