Total internal reflection mirrors and etched beam splitters for compact photonic integrated circuits

TIR mirrors and etched beam splitters based on weakly guided waveguides are demonstrated in GaAs/Al
_0.9
Ga
_0.1
As system. Mirror loss of 0.45 dB is measured. Resonators with 1.2 dB round trip loss and 7.6 nm FSR are also demonstrated.