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1. Toward quantum electronic-photonic systems-on-chip: a monolithic source of quantum-correlated photons with integrated frequency locking electronics and pump rejection

   https://doi.org/10.1364/CLEO_SI.2022.SM3N.2  

   Wang, I.; Cabanillas, J.M. Fargas; Kramnik, D.; Ramesh, A.; Buchbinder, S.; Kumar, P.; Stojanović, V.; Popović, M.A. (January 2022, Conference on Lasers and Electro-Optics)

   We demonstrate a CMOS electronic-photonic photon-pair source with integrated feedback-controlled frequency locking,>80 dB on-chip pump rejection, and signal/idler de-multiplexing, achieving a CAR of ≃5 at ≃40 ccps pair rate. 

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2. Ultralow-threshold thin-film lithium niobate optical parametric oscillator

   https://doi.org/10.1364/OPTICA.418984  

   Lu, Juanjuan; Al_Sayem, Ayed; Gong, Zheng; Surya, Joshua_B; Zou, Chang-Ling; Tang, Hong_X (April 2021, Optica)

   Materials with strong second-order ( ${\mathrm{\chi <\#comment/>}}^{\left(2\right)}$) optical nonlinearity, especially lithium niobate, play a critical role in building optical parametric oscillators (OPOs). However, chip-scale integration of low-loss ${\mathrm{\chi <\#comment/>}}^{\left(2\right)}$materials remains challenging and limits the threshold power of on-chip ${\mathrm{\chi <\#comment/>}}^{\left(2\right)}$OPO. Here we report an on-chip lithium niobate optical parametric oscillator at the telecom wavelengths using a quasi-phase-matched, high-quality microring resonator, whose threshold power ( $\sim <\#comment/>30\text{µ<\#comment/>}\mathrm{W}$) is 400 times lower than that in previous ${\mathrm{\chi <\#comment/>}}^{\left(2\right)}$integrated photonics platforms. An on-chip power conversion efficiency of 11% is obtained from pump to signal and idler fields at a pump power of 93 µW. The OPO wavelength tuning is achieved by varying the pump frequency and chip temperature. With the lowest power threshold among all on-chip OPOs demonstrated so far, as well as advantages including high conversion efficiency, flexibility in quasi-phase-matching, and device scalability, the thin-film lithium niobate OPO opens new opportunities for chip-based tunable classical and quantum light sources and provides a potential platform for realizing photonic neural networks. 

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3. Monolithically Integrated High-Order Vernier Filters and Tuning Circuits for Electronic-Photonic Quantum System-on-Chip

   https://doi.org/10.1364/CLEO_SI.2022.STh4H.4  

   Cabanillas, J.M. Fargas; Kramnik, D.; Wang, I.; Buchbinder, S.; Ramesh, A.; Kumar, P.; Stojanović, V.; Khilo, Anatol; Popović, M.A. (January 2022, Conference on Lasers and Electro-Optics)

   We demonstrate a monolithically integrated 6^th-order filter, with heater driver circuits implemented alongside photonics in a zero-change 45 nm CMOS platform, achieving<1 dB drop loss and>80 dB on-chip pump power suppression. 

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4. Polarization-diverse soliton transitions and deterministic switching dynamics in strongly-coupled and self-stabilized microresonator frequency combs

   https://doi.org/10.1038/s42005-024-01773-9  

   Wang, Wenting; Aldhafeeri, Alwaleed; Zhou, Heng; Melton, Tristan; Jiang, Xinghe; Vinod, Abhinav_Kumar; Yu, Mingbin; Lo, Guo-Qiang; Kwong, Dim-Lee; Wong, Chee_Wei (August 2024, Communications Physics)

   Abstract Dissipative Kerr soliton microcombs in microresonators have enabled fundamental advances in chip-scale precision metrology, communication, spectroscopy, and parallel signal processing. Here we demonstrate polarization-diverse soliton transitions and deterministic switching dynamics of a self-stabilized microcomb in a strongly-coupled dispersion-managed microresonator driven with a single pump laser. The switching dynamics are induced by the differential thermorefractivity between coupled transverse-magnetic and transverse-electric supermodes during the forward-backward pump detunings. The achieved large soliton existence range and deterministic transitions benefit from the switching dynamics, leading to the cross-polarized soliton microcomb formation when driven in the transverse-magnetic supermode of the single resonator. Secondly, we demonstrate two distinct polarization-diverse soliton formation routes – arising from chaotic or periodically-modulated waveforms via pump power selection. Thirdly, to observe the cross-polarized supermode transition dynamics, we develop a parametric temporal magnifier with picosecond resolution, MHz frame rate and sub-ns temporal windows. We construct picosecond temporal transition portraits in 100-ns recording length of the strongly-coupled solitons, mapping the transitions from multiple soliton molecular states to singlet solitons. This study underpins polarization-diverse soliton microcombs for chip-scale ultrashort pulse generation, supporting applications in frequency and precision metrology, communications, spectroscopy and information processing. 

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5. Tunable frequency combs in nanophotonic parametric oscillators from visible to mid-IR

   https://doi.org/10.1364/BGPPM.2022.JTh4A.7  

   Roy, Arkadev; Ledezma, Luis; Costa, Luis; Gray, Robert; Sekine, Ryoto; Guo, Qiushi; Liu, Mingchen; Briggs, Ryan M.; Marandi, Alireza (July 2022, Optical Devices and Materials for Solar Energy and Solid-state Lighting 2022)

   We demonstrate broadly-tunable synchronously-pumped optical parametric oscillators in nanophotonic lithium niobate. A picosecond 1-µm pump generates subpicosecond signal/idler frequency combs tunable between 1.5 and 3.3µm with up-conversion to the visible on the same chip. 

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