J. Semicond. > 2021, Volume 42 > Issue 4 > 041302, doi: 10.1088/1674-4926/42/4/041302
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Photonic radio frequency channelizers based on Kerr optical micro-combs

Mengxi Tan1, Xingyuan Xu2, Jiayang Wu1, Thach G. Nguyen3, Sai T. Chu4, Brent E. Little5, Roberto Morandotti6, 7, Arnan Mitchell3 and David J. Moss1,

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 Corresponding author: David J. Moss, dmoss@swin.edu.au

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Abstract: 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.

Key words: microwave photonic, signal channelization, integrated optical frequency comb



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Fig. 1.  (Color online) Schematic diagram of the broadband RF channelizer based on an integrated optical comb source. Amp: erbium-doped fibre amplifier. OBPF: optical bandpass filter. PC: polarization controller. MRR: micro-ring resonator. OC: optical coupler. PM: phase modulator. Temp. Con.: temperature controller. DEMUX: de-multiplexer. Rx: Receiver. OSA: optical spectrum analyzer. (a) Channelizer based on 200 GHz microcomb MRR with 49 GHz passive MRR. (b) Schematic diagram of the broadband RF channelizer based on a soliton crystal microcomb. EDFA: erbium-doped fibre amplifier. PC: polarization controller. MRR: micro-ring resonator. WS: WaveShaper. PM: phase modulator. TEC: temperature controller. DEMUX: de-multiplexer. Rx: Receiver.

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Fig. 2.  (Color online) Schematic illustration of the (a) 200 GHz-FSR MRR and (b) 49 GHz-FSR MRR. (c) SEM image of the cross-section of the 200 GHz MRR before depositing the silica upper cladding.

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Fig. 3.  (Color online) Optical spectrum for the 200 GHz FSR micro-comb device. (a) The primary comb. (b) The secondary comb. (c) The Kerr comb with 300 nm span. (d) The shaped optical comb for the channelizer with less than 0.5 dB unflatness. (e) 20 and (f) seleted 4 comb lines modulated by RF signals.

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Fig. 4.  (Color online) Drop-port transmission spectrum of the passive on-chip 49 GHz MRR (a) with a span of 5 nm, (b) showing an FSR of 49 GHz, and (c) a resonance at 193.294 THz with full width at half maximum (FWHM) of 124.94 MHz, corresponding to a Q factor of 1.549 × 106.

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Fig. 5.  (Color online) (a) The measured optical spectrum of the 200 GHz micro-comb and transmission of the 49 GHz MRR. Zoom-in views of the channels with different channelized RF frequencies. (b) Extracted channelized RF frequencies, the inset shows the corresponding optical frequencies of the comb lines and the spectral slicing resonances.

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Fig. 6.  RF response of the 200 GHz Channelizer. Measured optical spectrum of the 49 GHz MRR’s output with different input RF frequencies, with the temperature of the 49 GHz MRR set to (a) 24.0, (b) 24.5, (c) 25.0, and (d) 25.5 °C. (e) Channelized RF frequencies at different wavelength channels with different temperatures.

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Fig. 7.  (Color online) Channelized RF frequencies at different channels.

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Fig. 8.  (Color online) Extracted extinction ratio of channelized RF signals.

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Fig. 9.  (Color online) Optical spectrum of the generated soliton crystal microcomb with (a) 100 and (b) 40 nm span. (c) Flattened 92 comb lines.

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Fig. 10.  (Color online) (a) The measured optical spectrum of the micro-comb and drop-port transmission of passive MRRs. (b) Extracted channelized RF frequencies of the 92 channels, calculated from the spacing between the comb lines and the passive resonances. Note that the labelled channelized RF frequencies in (a) are adopted from accurate RF domain measurements using the Vector Network Analyzer, as shown in the next figure.

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Fig. 11.  (Color online) Measured RF transmission spectra of (a) the 92 channels and (b) zoom-in view of the first 4 channels. (b) Extracted channelized RF frequency and resolution. (d) Measured RF transmission spectra at different chip temperatures of the passive MRR.

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      Article Navigation >  Journal of Semiconductors  > 2021  >  42(4): 041302
      Mengxi Tan, Xingyuan Xu, Jiayang Wu, Thach G. Nguyen, Sai T. Chu, Brent E. Little, Roberto Morandotti, Arnan Mitchell, David J. Moss. Photonic radio frequency channelizers based on Kerr optical micro-combs[J]. Journal of Semiconductors, 2021, 42(4): 041302. doi: 10.1088/1674-4926/42/4/041302 M X Tan, X Y Xu, J Y Wu, T G Nguyen, S T Chu, B E Little, R Morandotti, A Mitchell, D J Moss, Photonic radio frequency channelizers based on Kerr optical micro-combs[J]. J. Semicond., 2021, 42(4): 041302. doi: 10.1088/1674-4926/42/4/041302.Export: BibTex EndNote
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      Mengxi Tan, Xingyuan Xu, Jiayang Wu, Thach G. Nguyen, Sai T. Chu, Brent E. Little, Roberto Morandotti, Arnan Mitchell, David J. Moss. Photonic radio frequency channelizers based on Kerr optical micro-combs[J]. Journal of Semiconductors, 2021, 42(4): 041302. doi: 10.1088/1674-4926/42/4/041302

      M X Tan, X Y Xu, J Y Wu, T G Nguyen, S T Chu, B E Little, R Morandotti, A Mitchell, D J Moss, Photonic radio frequency channelizers based on Kerr optical micro-combs[J]. J. Semicond., 2021, 42(4): 041302. doi: 10.1088/1674-4926/42/4/041302.
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      Photonic radio frequency channelizers based on Kerr optical micro-combs

      doi: 10.1088/1674-4926/42/4/041302
      • 1.

        Optical Sciences Centre, Swinburne University of Technology, Hawthorn, VIC 3122, Australia

      • 2.

        Electro-Photonics Laboratory, Department of Electrical and Computer Systems Engineering, Monash University, VIC3800, Australia

      • 3.

        School of Engineering, RMIT University, Melbourne, VIC 3001, Australia

      • 4.

        Department of Physics, City University of Hong Kong, Hong Kong, China

      • 5.

        State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an 710119, China

      • 6.

        INRS -Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Québec, J3X 1S2, Canada

      • 7.

        Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, China

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      • Author Bio:

        Mengxi Tan received a B.Eng. degree from Changchun University of Science and Technology in opto-electronic information engineering in 2014 and a M.S. degree in optical engineering in 2017 from Beijing University of Aeronautics and Astronautics. She is currently working toward her Ph.D. degree in Professor Moss’s group at Swinburne University of Technology, Melbourne, Australia. Her current research interests include integrated nonlinear optics, RF and microwave photonics, ultrahigh bandwidth optical communications and optical neural networks. She has a paper in Nature (2021) and Nature Communications (2020). She is a Student Member of the IEEE Photonics Society and the Optical Society of America

        David J. Moss is founding Director of the Optical Sciences Centre at Swinburne University of Technology in Melbourne, Australia. From 2016 to 2020 he was Director of the Centre for Microphotonics at Swinburne. From 2004 to 2014 he was with the University of Sydney and before that was a manager and senior scientist at JDS Uniphase in Ottawa Canada from 1998–2003. He received his PhD from the University of Toronto in Physics and BSc from the University of Waterloo. He currently has over 20 000 citations on Google Scholar with an h index of 92. He is a Fellow of the IEEE, OSA and SPIE

      • Corresponding author: dmoss@swin.edu.au
      • Received Date: 2021-02-08
      • Published Date: 2021-04-10

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