Low-loss circular core single-mode polymer optical waveguide compatible with Si photonics chips for off-chip interconnects

We demonstrate a very simple fabrication method for circular core single-mode polymer waveguides with a small intercore pitch (20 Jim) for high-density off-chip interconnects. Organic-inorganic hybrid materials are applied to the waveguide fabrication for reducing the propagation loss at 1550-nm wavelength to as low as 0.45 dB/cm.