Densely aligned single-mode polymer parallel optical waveguide compatible with Si photonics chips for off-chip interconnects

We fabricate narrow-pitch single-mode (SM) polymer optical waveguides compatible with Si photonics chips by means of a simple process named the Mosquito method. The inter-channel pitch could be 30 μm and less, while sufficiently low crosstalk (<;-30 dB) is achieved by the 30¼m pitch SM waveguide at 1550-nm wavelength.