No abstract

A fiber-to-tapered planar waveguide (PWG) coupler whose resonance wavelength and depth can be mechanically tuned is proposed and demonstrated. The resonance wavelength is controlled by changing the PWG thickness, while the extinction ratio is controlled by varying the coupling length between the fiber and the PWG. The effect of PWG thickness variation along the fiber direction on the resonance sharpness is also investigated. The fabrication techniques and experimental results are presented in detail, along with a short discussion on the potential applications of the device.