Low-Threshold Continuous-Wave Anti-Stokes Raman Lasing in Silicon Racetrack Resonators

Abstract

We report the first experimental observation of continuous-wave anti-Stokes Raman lasing in a reverse-biased 2.8 mm long multimode silicon racetrack resonator with high quality factors (>106) at all the pump, Stokes, and anti-Stokes wavelengths. The anti-Stokes laser has a milliwatt pump threshold power. The laser output power is linearly proportional to both the Stokes output power and the pump power. The Stokes output power becomes saturated at higher pump powers and limits the maximum output power of the anti-Stokes wave. Besides, a low-power (milliwatt pump power) all-optical wavelength converter with a wide wavelength tuning range is experimentally demonstrated via the coherent anti-Stokes Raman scattering in this multimode waveguide. The pump power is 200× lower than the previous reports with comparable Stokes/anti-Stokes power conversion efficiency. The wavelength converter can operate in the wavelength conversion range of the whole telecom band with a wavelength conversion range of about 220 nm.