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1. Mode-Selective Frequency Conversion in a Three-Mode Fiber

   https://doi.org/10.1364/CLEO_SI.2020.SM3P.3  

   Shamsshooli, Afshin ; Guo, Cheng ; Parmigiani, Francesca ; Li, Xiaoying ; Vasilyev, Michael ( January 2020 , CLEO 2020 Conference Proceedings)

   We present a scheme for spatial-mode-selective frequency conversion in a few-mode fiber and experimentally demonstrate upconversion of either of two signal modes from C-band to fundamental mode in S-band with crosstalk below –15.5 dB. 

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2. Toward OAM-selective frequency conversion in a three-mode fiber

   https://doi.org/10.1364/CLEO_SI.2021.SM1F.5  

   Shamsshooli, Afshin ; Guo, Cheng ; Parmigiani, Francesca ; Li, Xiaoying ; Vasilyev, Michael ( May 2021 , CLEO conference 2021)

   null (Ed.)

   We describe OAM-compatible mode-selective frequency conversion in a few-mode fiber and experimentally demonstrate downconversion of various superpositions of signal modes LP11a and LP11b to the same LP11b mode with conversion efficiency differences <0.8 dB. 

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3. Selective active resonance tuning for multi-mode nonlinear photonic cavities

   https://doi.org/10.1364/OE.512048  

   Logan, Alan_D ; Yama, Nicholas_S ; Fu, Kai-Mei_C ( March 2024 , Optics Express)

   Resonant enhancement of nonlinear photonic processes is critical for the scalability of applications such as long-distance entanglement generation. To implement nonlinear resonant enhancement, multiple resonator modes must be individually tuned onto a precise set of process wavelengths, which requires multiple linearly-independent tuning methods. Using coupled auxiliary resonators to indirectly tune modes in a multi-resonant nonlinear cavity is particularly attractive because it allows the extension of a single physical tuning mechanism, such as thermal tuning, to provide the required independent controls. Here we model and simulate the performance and tradeoffs of a coupled-resonator tuning scheme which uses auxiliary resonators to tune specific modes of a multi-resonant nonlinear process. Our analysis determines the tuning bandwidth for steady-state mode field intensity can significantly exceed the inter-cavity coupling rategif the total quality factor of the auxiliary resonator is higher than the multi-mode main resonator. Consequently, over-coupling a nonlinear resonator mode to improve the maximum efficiency of a frequency conversion process will simultaneously expand the auxiliary resonator tuning bandwidth for that mode, indicating a natural compatibility with this tuning scheme. We apply the model to an existing small-diameter triply-resonant ring resonator design and find that a tuning bandwidth of 136 GHz ≈ 1.1 nm can be attained for a mode in the telecom band while limiting excess scattering losses to a quality factor of 10⁶. Such range would span the distribution of inhomogeneously broadened quantum emitter ensembles as well as resonator fabrication variations, indicating the potential for the auxiliary resonators to enable not only low-loss telecom conversion but also the generation of indistinguishable photons in a quantum network.

    

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4. Spatial-Mode-Selective Frequency Conversion

   Shamsshooli, Afshin ; Kwon, Young B. ; Guo, Cheng ; Parmigiani, Francesca ; Li, Xiaoying ; Langrock, Carsten ; Fejer, Martin M. ; Vasilyev, Michael ( September 2021 , Photonics in Switching and Computing 2021)

   We discuss wavelength conversion of a selected signal spatial mode, which preserves its quantum state and does not disturb other signal spatial modes. We present the results for a lithium niobate waveguide and a few-mode-fiber. 

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5. Emerging applications of wavelength conversion

   https://doi.org/10.1109/IPC48725.2021.9592892  

   Shamsshooli, Afshin ; Guo, Cheng ; Vasilyev, Michael ; Parmigiani, Francesca ; Li, Xiaoying ; Akasaka, Youichi ; Palacharla, Paparao ( October 2021 , 2021 IEEE Photonics Conference (IPC))

   We discuss three emerging applications of wavelength conversion: 1) hybrid amplification outside of EDFA band, based on a combination of two wavelength converters and an EDFA, 2) spatial-mode-selective wavelength conversion, and 3) generation of spatial-mode-entangled photon pairs. 

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