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We propose the use of titanium dioxide as cladding material to reduce the temperature sensitivity of silicon-based microresonators. The advantages of using titanium dioxide over the conventional alternatives are discussed, and experimental results are presented.
We present a method for eliminating the temperature dependence of the resonance wavelength in high-Q silicon-based microdisk resonators by using a polymer cladding with a negative thermo-optic coefficient. Design requirements for athermal performance are derived based on theory and simulation, and their validity is experimentally verified.
— Over-coupled microdisk resonators with high intrinsic quality factors are proposed as compact and low-insertion-loss delay lines for narrowband optical filters. Design challenges including dealing with the multimode nature of the microdisk resonator and achieving a strong coupling to the selected mode are addressed. Employing the microdisk-based delay… (More)
We present a fully reconfigurable fourth-order RF photonic filter on SOI platform with a tunable 3-dB bandwidth of 0.9-5 GHz, more than 38 dB optical out-of-band rejection, FSR up to 650 GHz, and compact size (total area 0.25 mm(2)). The center wavelength of the filter can be tuned over a wide range with a power consumption of 10 mW/nm. The filter… (More)
One of the main drawbacks of the high-index-contrast silicon-on-insulator platform in integrated photonics is the high sensitivity of the resonance wavelength of resonators to dimensional variations caused by fabrication imperfection. In this work, we experimentally demonstrate an accurate postfabrication trimming technique for compensating the… (More)
ACKNOWLEGMENTS First and foremost, I would like to thank my advisor, Prof. Ali Adibi, for his support and guidance throughout my PhD years, and for giving me the chance to be a part of the Georgia Tech community. the past six years. for their kind efforts in reviewing the present dissertation, and for honoring me with their presence at my doctoral defense… (More)
To my mother, my wife, and in the loving memory of my father v ACKNOWLEDGEMENTS At the onset, I wish to thank Prof. Ali Adibi not only for being my advisor but also for being my best friend during my Ph.D. He trained me to be an independent researcher and imbibed me with the sense of confidence to search for solutions with hope and patience. I am thankful… (More)
Nanophotonic resonators are very sensitive to sidewall roughness. We investigate in detail the sidewall roughness, correlation length and fractal roughness exponent for high Q silicon resonators using a 3D AFM
We demonstrate a compact, thermally reconfigurable reflection canceller on SOI for adaptive on-chip optical isolation without reliance on magneto-optic or nonlinear properties. An isolation ratio of 34dB is achieved with an insertion loss of <0.15dB. Elimination of unwanted feedback in optical networks can be necessary for various reasons. For example, the… (More)
We demonstrate a compact, thermally reconfigurable reflection suppressor on a silicon-on-insulator (SOI) platform, without reliance on nonreciprocal mechanisms. A reflection suppression ratio of 40 dB is achieved with a footprint of 105 μm in length. The insertion loss of the device is below 0.15 dB, and its total power consumption stays below 20 mW. The… (More)