A MEMS digital mirror for tunable laser wavelength selection

This paper presents a digital mirror for tunable laser wavelength selection using microelectromechanical systems (MEMS) technology. The digital mirror which has discrete reflection spectrum is totally different compared to the current broadband mirrors MEMS tunable lasers . The reflection of the digital mirror can be tuned by digital pumping signals which promise fast output wavelength switching. The experimental results show that the output wavelength of the MEMS tunable laser using the digital mirror has high tuning resolution without increasing the physical length of the internal cavity of the tunable laser. The output wavelength of tuning resolution can reach 0.2 nm and the bandwidth is around 0.04 nm.