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We demonstrate that n-doped resistive heaters in silicon waveguides showphotoconductive effects with high responsivities. These photoconductiveheaters, integrated into microring resonator (MRR)-based filters, were used toautomatically tune and stabilize the filter's resonance wavelength to the inputlaser's wavelength. This is achieved without requiring dedicated defectimplantations, additional material depositions, dedicated photodetectors, oroptical power tap-outs. Automatic wavelength stabilization of first-order MRRand second-order series-coupled MRR filters is experimentally demonstrated.Open eye diagrams were obtained for data transmission at 12.5 Gb/s while thetemperature was varied by 5 C at a rate of 0.28 C/s. We theoretically show thatseries-coupled MRR-based filters of any order can be automatically tuned byusing photoconductive heaters to monitor the light intensity in each MRR, andsequentially aligning the resonance of each MRR to the laser's wavelength.

Wavelength tuning and stabilization of microring-based filters using silicon in-resonator photoconductive heaters