A single etch-step fabrication-tolerant polarization splitter

A tolerant single etch-step passive polarization splitter on InP/InGaAsP is designed and fabricated. The device consists of a directional coupler with a wide and a narrow waveguide. Modal birefringence of the third-order modes for transverse electric (TE) and transverse magnetic (TM) polarizations is employed to selectively couple one polarization. Tapering is applied to increase the tolerances. The devices are characterized, and the measurement results show good agreement with the beam-propagation-method simulations: a splitting ratio larger than 95% for a width range of around 100 nm and over a large wavelength range, covering at least the C-ban

Realization of polarization based integration scheme (POLIS) for active and passive components

Polarization based integration scheme (POLIS) combines active and passive components on the same material, using polarization properties of compressively strained InGaAs/InP quantum wells. A first integrated circuit with detectors, polarization converters and waveguides has been fabricated, characterized and reasonable performances have been observed