We present an integrated hybrid semiconductor-dielectric (InP-Si 3 N 4 ) waveguide laser that generates frequency combs at a wavelength around 1.5 μ m with a record-low intrinsic optical linewidth of 34 kHz. This is achieved by extending the cavity photon lifetime using a low-loss dielectric waveguide circuit. In our experimental demonstration, the on-chip, effective optical path length of the laser cavity is extended to 6 cm. The resulting linewidth narrowing shows the high potential of on-chip, highly coherent frequency combs with direct electrical pumping, based on hybrid and heterogeneous integrated circuits making use of low-loss dielectric waveguides.
|Publication status||Published - 18 Feb 2019|
Mak, J., van Rees, A., Fan, Y., Klein, E. J., Geskus, D., van der Slot, P. J. M., & Boller, K. J. (2019). Integrated frequency comb laser with narrow intrinsic optical linewidth based on a dielectric waveguide feedback circuit. (Arxiv.org). arXiv.org.