A novel tunable external-cavity semiconductor laser structure is presented in this paper
in which an MEMS-based Tunable Optical Filter(TOF) and a silicon etlon are used as the wavelength selection components and a Liquid Crystal(LC) cell as the phase compensation element and a planar reflector to provide feedback.A laser sample in this structure is developed.The experimental results show that its output power and side mode suppression ratio are >10 dBm and >50 dB respectively
its tuning range is as high as 7 nm and its linewidth about 200 kHz.