Answers are grounded in this paper and cite their sources.
We have fabricated InP/GaInAsP rib waveguides with losses as low as 0.18dB/cm for the TE polarisation and 0.26dB/cm for the TM polarisation. The length of the waveguides was 28 mm. These losses are measured with the Fabry-Perot method and repeated for different lengths of the waveguide for determining the reflection coefficient.
No takes yet. Share an insight, caveat, or question.
Angenent et al. (1989) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: