title: Photonic generation of stable microwave signals from a dual-wavelength Al2O3:Yb3+ distributed-feedback waveguide laser.
abstract: We report the fabrication and characterization of a dual-wavelength distributed-feedback channel waveguide laser in ytterbium-doped aluminum oxide. Operation of the device is based on the optical resonances that are induced by two local phase shifts in the distributed-feedback structure. A stable microwave signal at ~15 GHz with a -3 dB width of 9 kHz was subsequently created via the heterodyne photodetection of the two laser wavelengths. The long-term frequency stability of the microwave signal produced by the free-running laser is better than ±2.5 MHz, while the power of the microwave signal is stable within ±0.35 dB.
authors.affiliation: Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands. E.H.Bernhardi@utwente.nl
authors.forename: E H
authors.initials: EH
authors.lastname: Bernhardi
authors.forename: M R H
authors.initials: MR
authors.lastname: Khan
authors.forename: C G H
authors.initials: CG
authors.lastname: Roeloffzen
authors.forename: H A G M
authors.initials: HA
authors.lastname: van Wolferen
authors.forename: K
authors.initials: K
authors.lastname: Wörhoff
authors.forename: R M
authors.initials: RM
authors.lastname: de Ridder
authors.forename: M
authors.initials: M
authors.lastname: Pollnau