We demonstrate microring lasers based on Si3N4 optical waveguides cladded with MAPbBr3 quantum dots composite film. Si3N4 microrings are designed and fabricated with electron beam (E-beam) lithography and inductively-coupled plasma reactive-ion-etching followed by spin coating a MAPbBr3 quantum dots composite film on them. We clearly observe the lasing modes with narrow linewidths for both TE- and TM-polarization modes when the microrings are optically pumped with a nanosecond laser. The experimental results show that the laser has a typical linewidth of 0.23 nm and a minimum pump power of 8.46 μJ/cm2.
Currently it is becoming very important to enhance the capacity of single-wavelength carrier by introducing multiplexed channels carried by multiple guided-modes as well as dual polarizations in optical interconnects. For the realization of mode-division-multiplexing (MDM) and polarization-division-multiplexing (PDM), one of the keys is the realization of efficient mode/polarization-manipulation. Accordingly, it is desired to develop various high-performance photonic integrated devices for mode/polarization-manipulation-on-chip. Silicon photonics provides an attractive option for realizing ultra-compact photonics integrated devices and has been developed very successfully. Great progresses has been made on the development of silicon photonic devices for mode/polarization-manipulation-on-chip, which is reviewed in this paper.
Silicon-based optical microcavities are very popular for many applications because of the ultra-compact footprint, easy scalability, and functional versatility. In this paper we give a discussion about the challenges of the optical microcavities on silicon and also give a review of our recent work, including the following parts. First, a near-“perfect” high-order MRR optical filter with a box-like filtering response is realized by introducing bent directional couplers to have sufficient coupling between the access waveguide and the microrings. Second, an efficient thermally-tunable MRR-based optical filter with graphene transparent nano-heater is realized by introducing transparent graphene nanoheaters. Thirdly, a polarization-selective microring-based optical filter is realized to work with resonances for only one of TE and TM polarizations for the first time. Finally, a on-chip reconfigurable optical add-drop multiplexer for hybrid mode- /wavelength-division-multiplexing systems is realized for the first time by monolithically integrating a mode demultiplexer, four MRR optical switches, and a mode multiplexer.
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