title: Wavelength tuning and stabilization of microring-based filters using silicon in-resonator photoconductive heaters.
abstract: We demonstrate that n-doped resistive heaters in silicon waveguides show photoconductive effects with high responsivities. These photoconductive heaters, integrated into microring resonator (MRR)-based filters, were used to automatically tune and stabilize the filter's resonance wavelength to the input laser's wavelength. This is achieved without requiring dedicated defect implantations, additional material depositions, dedicated photodetectors, or optical power tap-outs. Automatic wavelength stabilization of first-order MRR and second-order series-coupled MRR filters is experimentally demonstrated. Open eye diagrams were obtained for data transmission at 12.5 Gb/s while the temperature was varied by 5 °C at a rate of 0.28 °C/s. We theoretically show that series-coupled MRR-based filters of any order can be automatically tuned by using photoconductive heaters to monitor the light intensity in each MRR, and sequentially aligning the resonance of each MRR to the laser's wavelength.
authors.forename: Hasitha
authors.initials: H
authors.lastname: Jayatilleka
authors.forename: Kyle
authors.initials: K
authors.lastname: Murray
authors.forename: Miguel Ángel
authors.initials: MÁ
authors.lastname: Guillén-Torres
authors.forename: Michael
authors.initials: M
authors.lastname: Caverley
authors.forename: Ricky
authors.initials: R
authors.lastname: Hu
authors.forename: Nicolas A F
authors.initials: NA
authors.lastname: Jaeger
authors.forename: Lukas
authors.initials: L
authors.lastname: Chrostowski
authors.forename: Sudip
authors.initials: S
authors.lastname: Shekhar