Low-loss interconnection between electrooptic and passive polymer waveguides with a vertical taper

摘要

To enable the hybrid integration of electrooptic (EO) polymer and low-loss passive waveguides, a low-loss interconnection between the two waveguides is demonstrated based upon adiabatic coupling in a vertically tapered waveguide. Fluorinated passive polymers incorporated in this device exhibit 0.35 dB/cm of propagation loss, and the EO polymer has an EO coefficient of 35 pm/V and high thermal stability with a glass transition temperature of 200/spl deg/C. According to a beam propagation method simulation, the interconnection loss could be negligible if the taper length is longer than 300 /spl mu/m. From the fabricated device, an interconnection loss of 0.4 dB is demonstrated by cutback measurement of the waveguide loss.