E-band widely tunable, narrow linewidth heterogeneous laser on silicon

J. Guo, C. Xiang, T. J. Morin, J. D. Peters, L. Chang, and J. E. Bowers
Publication Image
Optical spectra of the laser tuned from 1350 to 1408nm
Publication Date
Publication Type
Journal/Conference Name
APL Photonics
8, 046114

We demonstrate a heterogeneously integrated laser on silicon exhibiting a sub-20 kHz Lorentzian linewidth over a wavelength tuning range of 58 nm from 1350 to 1408 nm, which are record values to date for E-band integrated lasers in the literature. Wide wavelength tuning is achieved with an integrated Si ring-resonator-based Vernier mirror, which also significantly reduces the Lorentzian linewidth. Such a record performance leverages a mature heterogeneous III–V/Si platform and marks an important milestone in E-band optical fiber communications and in reaching visible wavelengths via second harmonic generation for optical atomic clock applications.