D-Shaped Silicon-Cored Fibers as Platform to Build In-Line Schottky Photodetectors

We demonstrated a novel silicon photonic platform constituting a D-shaped silicon cored fiber (SCF) for Schottky photodetector (PD). By using a handheld polishing machine, D-shaped SCFs can be fabricated in a fast and simple way. D-shaped SCFs offer stable platforms for traditional semiconductor processing and we show that Schottky PDs could be easily made on the fibers. Experiment results confirm an improved responsivity of 0.577 mA/W and the modulation bandwidth could reach 170 MHz. The D-shaped SCFs may open a new approach of making all-in-fiber silicon photonic devices.