Temperature Dependence of Coupling Loss from SMF to Polymer Optical Waveguides with Various Refractive Index Profiles

In this paper, we theoretically estimate the temperature dependence of coupling loss between single-mode (SM) polymer optical waveguides and general-purpose SM fiber (SMF), and discuss about the applicability of polymer optical waveguides to co-packaged optics (CPO). Although SM polymer optical waveguides are expected to be applied as an element of CPO, their small cores require precise mode-field adjustment with precise alignment of the cores. The mode-field and alignment positions of polymer waveguides are conce1ed to be affected by their operation temperature, particularly when integrated with Si photonics chips that could be a heat source. Simulation results show that the properties are maintained even under high-temperature operation.