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| 1 | Photonic microwave true time delays for phased array antennas using a 49 GHz FSR integrated optical micro-comb source[Invited]显示文摘We demonstrate significantly improved performance of a microwave true time delay line based on an integrated optical frequency comb source. The broadband micro-comb(over 100 nm wide) features a record low free spectral range(FSR) of 49 GHz, resulting in an unprecedented record high channel number(81 over the C band)—the highest number of channels for an integrated comb source used for microwave signal processing. We theoretically analyze the performance of a phased array antenna and show that this large channel count results in a high angular resolution and wide beam-steering tunable range. This demonstrates the feasibility of our approach as a competitive solution toward implementing integrated photonic true time delays in radar and communications systems. | XINGYUAN Xu JIAYANG Wu THACH G.NGUYEN TANIA MOEIN SAI T.CHU BRENT E.LITTLE ROBERTO MORANDOTTI ARNAN MITCHELL DAVID J.Moss | 2018 | Photonics Research2018，6，5： | 4 |
| 2 | Direct characterization of a nonlinear photonic circuit’s wave function with laser light显示文摘Integrated photonics is a leading platform for quantum technologies including nonclassical state generation1–4,demonstration of quantum computational complexity5 and secure quantum communications6.As photonic circuits grow in complexity,full quantum tomography becomes impractical,and therefore an efficient method for their characterization7,8 is essential.Here we propose and demonstrate a fast,reliable method for reconstructing the two-photon state produced by an arbitrary quadratically nonlinear optical circuit.By establishing a rigorous correspondence between the generated quantum state and classical sum-frequency generation measurements from laser light,we overcome the limitations of previous approaches for lossy multimode devices9,10.We applied this protocol to a multi-channel nonlinear waveguide network and measured a 99.28±0.31%fidelity between classical and quantum characterization.This technique enables fast and precise evaluation of nonlinear quantum photonic networks,a crucial step towards complex,largescale,device production. | Francesco Lenzini Alexander N Poddubny James Titchener Paul Fisher Andreas Boes Sachin Kasture Ben Haylock Matteo Villa Arnan Mitchell Alexander S Solntsev Andrey A Sukhorukov Mirko Lobino | 2018 | Light(Science & Applications)2018，7，1： | 2 |
| 3 | Orthogonally polarized RF optical single sideband generation with integrated ring resonators显示文摘We review recent work on narrowband orthogonally polarized optical RF single sideband generators as well as dualchannel equalization,both based on high-Q integrated ring resonators.The devices operate in the optical telecommunications C-band and enable RF operation over a range of either fixed or thermally tuneable frequencies.They operate via TE/TM mode birefringence in the resonator.We achieve a very large dynamic tuning range of over 55 dB for both the optical carrier-to-sideband ratio and the dual-channel RF equalization for both the fixed and tunable devices. | Mengxi Tan Xingyuan Xu Jiayang Wu Thach G.Nguyen Sai T.Chu Brent E.Little Arnan Mitchell Roberto Morandotti David J.Moss | 2021 | Journal of Semiconductors2021，42，4： | 1 |
| 4 | Correspondence:Wavelength-selective wavefront shaping by metasurface显示文摘Precise,wavelength-dependent phase retarding is essential in many fields,such as superresolution imaging,full-color holography,nanomanufacturing,and optical communications.This demand can be achieved by a combination of multiple optical devices but is challenging to implement using a single element.In this paper,we develop a method for metasurface design that allows wavelength-selective wavefront shaping.Specifically,we demonstrate a metasurface that can selectively modulate a beam with a spiral phase at 785 nm and leave another beam unaffected at 590 nm. | Zixin CAIS Xin HE Xin LIU Shijie TU Xinjie SUN Paul BECKETT Aditya DUBEY Arnan MITCHELL Guanghui REN Xu LIU Xiang HAO | 2023 | Frontiers of Information Technology & Electronic Engineering2023，24，4： | 0 |
| 5 | General Theoretical Model for Resonantly Enhanced Optical Modulators显示文摘1 IntroductionLiNbO3 optical modulators have become essential transmission devices for current and future wideband fibre-optic communications for both military and telecommunications applications. For many telecommunications applications, only a narrow bandwidth is required and thus resonantly enhancedMach-Zehndermodulators(RE-MZMs)have been developed to improve modulation efficiency at the expense of bandwidth. | Yuvaraja S. Visagathilagar Arnan Mitchell Michael W. Austin | 2003 | 光学学报2003，23，S1： | 0 |
| 6 | Photonic radio frequency channelizers based on Kerr optical micro-combs显示文摘We review recent work on broadband RF channelizers based on integrated optical frequency Kerr micro-combs combined with passive micro-ring resonator filters,with microcombs having channel spacings of 200 and 49 GHz.This approach to realizing RF channelizers offers reduced complexity,size,and potential cost for a wide range of applications to microwave signal detection. | Mengxi Tan Xingyuan Xu Jiayang Wu Thach G.Nguyen Sai T.Chu Brent E.Little Roberto Morandotti Arnan Mitchell David J.Moss | 2021 | Journal of Semiconductors2021，42，4： | 0 |
| 7 | Spatio-temporal isolator in lithium niobate on insulator显示文摘In this contribution,we simulate,design,and experimentally demonstrate an integrated optical isolator based on spatiotemporal modulation in the thin-film lithium niobate on an insulator waveguide platform.We used two cascaded travelling wave phase modulators for spatiotemporal modulation and a racetrack resonator as a wavelength filter to suppress the sidebands of the reverse propagating light.This enabled us to achieve an isolation of 27 dB.The demonstrated suppression of the reverse propagating light makes such isolators suitable for the integration with III-V laser diodes and Erbium doped gain sections in the thin-film lithium niobate on the insulator waveguide platform. | Haijin Huang Armandas Balčytis Aditya Dubey Andreas Boes Thach GNguyen Guanghui Ren Mengxi Tan Arnan Mitchell | 2023 | Opto-Electronic Science2023，2，3： | 0 |
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