Article
Computer Science, Hardware & Architecture
Shaojuan Zhang, Rafael Kraemer, Xuwei Xue, Netsanet Tessema, Henrique Freire Santana, Eduward Tangdiongga, Nicola Calabretta
Summary: Optical wireless data center networks (OW-DCNs) utilize optical wireless technology and optical wired switching technology to eliminate cable complexity and create high bandwidth interconnections. This research proposes an OW-DCN system based on arrayed waveguide grating routers and fast tunable transmitters (T-TXs) that employ photonic integrated circuit multicast switches (PIC-MCSs) for nanosecond-scale fast optical switching, multicast operation, T-TX sharing, and dynamic bandwidth allocation. Experimental results validate its lossless, nanosecond, and multicast switching capabilities, as well as its dynamic bandwidth allocation and optical packet switching capability.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Engineering, Electrical & Electronic
Stefanos Kovaios, Apostolos Tsakyridis, George Giamougiannis, Konstantinos Fotiadis, Davide Sacchetto, Michael Zervas, Miltiadis Moralis-Pegios, Nikos Pleros
Summary: This paper presents the experimental performance of 3 x 3 and 4 x 4 Generalized Mach Zehnder Interferometers (GMZI) integrated on the Si3N4 waveguide platform, serving as switching and variable power splitting modules. The GMZI structures exhibit resonant spectral behavior and low insertion losses.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Brandon Buscaino, Elizabeth Chen, James W. Stewart, Thang Pham, Joseph M. Kahn
Summary: This study explores co-packaged optical interfaces for data center switches, comparing different architectures based on single- or multi-wavelength light sources and coherent or direct detection. The results show that coherent detection architectures support higher switch bandwidths and link budgets, while direct detection architectures are more limited.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Minfeng Jin, Guihan Wu, Xin Zhou, Qiuyang Jiang, Zhongzhi Lin, Wei Jiang
Summary: We propose and experimentally demonstrate a Mach-Zehnder silicon thermo-optic switch based on a parabolic multimode interference coupler. The parabolic structure is designed to achieve extremely small imbalance of output power and good fabrication tolerance. In experiment, high average extinction ratios over 35 dB and maximum values over 40 dB can be achieved from 1520 nm to 1580 nm. The proposed parabolic MMI has a small footprint of only 2.4 μm x 9.5 μm.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Article
Computer Science, Hardware & Architecture
Muhammad Umar Masood, Lorenzo Tunesi, Ihtesham Khan, Bruno Correia, Rasoul Sadeghi, Enrico Ghillino, Paolo Bardella, Andrea Carena, Vittorio Curri
Summary: To support the increasing demand for bandwidth-intensive applications, the capacity of the optical transport network needs to be expanded. Multi-band transmission solutions can achieve this by utilizing low-loss optical spectrum windows and the existing fiber infrastructure. A novel reconfigurable optical add-drop multiplexer (ROADM) architecture using a modular photonic integrated multi-band wavelength selective switch (WSS) is proposed in this study, with comprehensive network performance analysis conducted to demonstrate the benefits of transitioning to multi-band transmission.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Engineering, Electrical & Electronic
Zhihai Liu, Xiang Li, Yu Zhang, Wei Jin, Yaxun Zhang, Siying Cheng, Yaru Li, Libo Yuan
Summary: In this study, an all-optical controllable switch device with non-volatile, broadband adjustable, and bistable fast switching performance was proposed and demonstrated by integrating the phase-change material onto the optical fiber. This device is expected to enable fast and broadband optical routing and provide new storage and computing functionalities to optical fibers in the future.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Xiaoxi Wang, Shayan Mookherjea
Summary: A high-speed, low-loss modular cross-bar switching element suitable for single photons is demonstrated. It achieves entanglement preserving voltage-driven switching of single photons with ultra-fast and low-loss characteristics. The switch is well matched to the wavelength, bandwidth, and lifetime of photons generated by spontaneous four-wave mixing sources in silicon photonics, enabling reconfigurability of each single photon and addressing of each time bin.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
T. Moschos, C. Pappas, G. Mourgias-Alexandris, T. Alexoudi, C. Vagionas, A. Miliou, N. Pleros
Summary: This article demonstrates an all-optical bistable monolithically integrated photonic waveguide memory of distinctive simplicity for the first time. It relies on two travelling waveguide Semiconductor Optical Amplifiers with Cross Gain modulation (SOA-XGM) phenomena, showcasing fast photonic memory unit potential.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Saeed Fathololoumi, David Hui, Susheel Jadhav, Jian Chen, Kimchau Nguyen, M. N. Sakib, Z. Li, Hari Mahalingam, Siamak Amiralizadeh, Nelson N. Tang, Harinadh Potluri, Mohammad Montazeri, Harel Frish, Reece A. Defrees, Christopher Seibert, Alexander Krichevsky, Jonathan K. Doylend, John Heck, R. Venables, A. Dahal, A. Awujoola, A. Vardapetyan, Guneet Kaur, Min Cen, Vishnu Kulkarni, Syed S. Islam, R. L. Spreitzer, S. Garag, A. C. Alduino, R. K. Chiou, L. Kamyab, S. Gupta, B. Xie, R. S. Appleton, S. Hollingsworth, S. McCargar, Y. Akulova, K. M. Brown, R. Jones, Daniel Zhu, Thomas Liljeberg, Ling Liao
Summary: This article describes the performance of high bandwidth-density silicon photonic based integrated circuits, showcasing the first fully functional photonic engine module co-packaged with an Ethernet switch. A 1.6 Tbps SiPh transmitter IC was demonstrated, integrating on-die all components needed to support sixteen 106.25 Gbps PAM4 optical transmit channels. The photonic engine is designed to allow up to sixteen modules to be co-packaged around a high-bandwidth switch ASIC.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Tomohiro Kita, Manuel Mendez-Astudillo
Summary: In this study, an ultra-high-speed and low-power consumption Mach-Zehnder interferometer (MZI)-type optical switch using thermo-optical effect was successfully demonstrated. By incorporating an asymmetric doped MZI structure and an integrated heat sink, the switch achieved fast switching operation and small device footprint. This optical switch can be manufactured using standard silicon photonic devices manufacturing process, making it practical and useful in various optical integrated circuits.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Computer Science, Hardware & Architecture
Aleksandra Kaszubowska-Anandarajah, Syed Tajammul Ahmad, Chris G. H. Roeloffzen, Paulus W. L. van Dijk, Ankit Sharma, Manas Srivastava, Prajwal D. Lakshmijayasimha, M. Deseada Gutierrez Pascual, Frank Smyth, Jules Braddell, Prince M. Anandarajah
Summary: A reconfigurable photonic integrated transmitter, allowing dynamic resource allocation in the metro-access network, is proposed. It is composed of a multicarrier sliceable bandwidth variable transmitter (MC-SBVT) made of indium phosphide and a silicon-nitride-based optical cross-connect (OXC). The architecture provides full flexibility in data format/bandwidth choice, channel spacing, and wavelength assignment. The functional design and practical realization of the MC-SBVT and OXC, as well as preliminary characterization results, demonstrating device reconfigurability, are discussed.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2023)
Article
Chemistry, Analytical
Dusan Gostimirovic, Richard Soref
Summary: In this work, we present a compact toolkit of inverse-designed, topologically optimized silicon photonic devices that can be arranged in a plug-and-play fashion to realize various photonic integrated circuits. The included devices, such as splitters, crossovers, and resonators, enable the circuits to achieve low insertion loss and low crosstalk. The use of inverse-design approach allows for more flexible design of individual devices, enhancing the overall circuit architecture and enabling low-complexity circuit design.
Article
Engineering, Electrical & Electronic
Jose Roberto Rausell Campo, Daniel Perez-Lopez
Summary: This article discusses the implementation of nonlinear activation functions in optical neural networks and compares the response of different electro-optic architectures. The study demonstrates that ring assisted MZI and two-ring assisted MZI have the highest expressivity among the proposed structures. The article also presents a quantitative analysis of the capabilities of optical devices to mimic state-of-the-art activation functions, and benchmarks the obtained activation functions on two machine learning examples.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Weihong Shen, Jiangbing Du, Ke Xu, Zuyuan He
Summary: In this research, a dual-mode switch for 2-μm waveband was designed and fabricated, demonstrating low insertion loss and high-speed switching capability for mode division multiplexing (MDM). The experimental results showed high-speed MDM routing and promising prospects for future photonic integration and high-speed MDM networking.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Hao Song, Huibin Zhou, Kaiheng Zou, Runzhou Zhang, Kai Pang, Haoqian Song, Xinzhou Su, Amir Minoofar, Nanzhe Hu, Cong Liu, Robert Bock, Brittany Lynn, Shlomo Zach, Moshe Tur, Alan E. Willner
Summary: In this study, a tunable, broadband pixel-array-based integrated receiver was experimentally used for recovering orbital-angular-momentum (OAM) multiplexed channels. The receiver consists of a pixel-array mode converter, four phase controllers, and a pixel-array 4-to-3 coupler, enabling the reception and routing of OAM beams. Experimental results demonstrate the high-quality data transmission capability of the receiver within a broad bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Colm Browning, Qixiang Cheng, Nathan C. Abrams, Marco Ruffini, Liang Yuan Dai, Liam P. Barry, Keren Bergman
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2020)
Article
Engineering, Electrical & Electronic
Anthony Rizzo, Qixiang Cheng, Stuart Daudlin, Keren Bergman
Summary: The ultra-broadband silicon photonic interleaver demonstrated in this study can interleave and de-interleave frequency comb lines over a 125 nm bandwidth in the extended C- and L-bands, yielding a potential capacity of 78 total wavelength-division multiplexed channels. This device represents a significant advancement towards achieving highly parallel integrated optical links with broadband frequency comb sources within the silicon photonics platform.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Computer Science, Hardware & Architecture
Madeleine Glick, Nathan C. Abrams, Qixiang Cheng, Min Yee Teh, Yu-Han Hung, Oscar Jimenez, Songtao Liu, Yoshitomo Okawachi, Xiang Meng, Leif Johansson, Manya Ghobadi, Larry Dennison, George Michelogiannakis, John Shalf, Alan Liu, John Bowers, Alex Gaeta, Michal Lipson, Keren Bergman
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2020)
Article
Engineering, Electrical & Electronic
Ziying Xie, Kaixuan Ye, Ken Xingze Wang, Qixiang Cheng, Min Tan
Summary: This paper introduces a TDM CLDO that shares one controller between multiple output channels for independent regulation, showing higher area efficiency and accuracy. Experimental results demonstrate the effectiveness of the system under different conditions.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2021)
Article
Engineering, Electrical & Electronic
Kexin Wang, Xinke Tang, Adrian Wonfor, Robert John Collins, Gerald S. Buller, Richard Penty, Ian H. White, Xu Wang
Summary: Data security is increasingly important in modern telecommunications. The threat posed by quantum computational processors to current public key encryption algorithms has led to the development of new encryption approaches. This study presents a highly secure encryption method using quantum key distribution to generate encryption keys at rates up to 2.9 Mbit/s for physical layer encryption, demonstrating secure communication over optical fiber at realistic data rates.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Optics
Ang Li, Chunhui Yao, Junfei Xia, Huijie Wang, Qixiang Cheng, Richard Penty, Yeshaiahu Fainman, Shilong Pan
Summary: The proliferation of Internet of Things has led to the miniaturization of spectrometers, but with lower technology readiness levels for manufacturing. This paper analyzes the key metrics for adopting miniaturized spectrometers and summarizes recent progress and solutions for addressing miniaturization challenges.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Optics
Chunhui Yao, Qixiang Cheng, Gunther Roelkens, Richard Penty
Summary: This paper presents a compact and highly tolerant vertical coupling structure that bridges the gap between conventional resonant couplers and adiabatic couplers. The design is capable of high coupling efficiency and exhibits high tolerance to structural deformation. It is suitable for various integration platforms.
PHOTONICS RESEARCH
(2022)
Article
Optics
Minjia Chen, Qixiang Cheng, Masafumi Ayata, Mark Holm, Richard Penty
Summary: This study proposes, for the first time, an N x N iterative photonic processor for fast computation of complex-valued matrix inversion. Compared to traditional digital electronic processing, optical signal processing offers higher efficiency and speed. The processor is based on photonic integration platforms, providing superior processing efficiency and power efficiency, which makes it a promising solution for future optical signal processing systems.
PHOTONICS RESEARCH
(2022)
Editorial Material
Optics
Qixiang Cheng, Madeleine Glick, Thomas Van Vaerenbergh
Article
Engineering, Electrical & Electronic
Anthony Rizzo, Stuart Daudlin, Asher Novick, Aneek James, Vignesh Gopal, Vaishnavi Murthy, Qixiang Cheng, Bok Young Kim, Xingchen Ji, Yoshitomo Okawachi, Matthew van Niekerk, Venkatesh Deenadayalan, Gerald Leake, Michael Fanto, Stefan Preble, Michal Lipson, Alexander Gaeta, Keren Bergman
Summary: Silicon photonics has great potential in improving optical interconnects in data centers and high performance computers, enabling higher transmission rates and lower energy consumption. This study reviews recent progress in silicon photonic interconnects, with a focus on chip-scale Kerr frequency comb sources, and provides a comprehensive overview of scalable silicon photonic systems. Experimental results demonstrate the feasibility of volume manufacturing for this technology.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Junfei Xia, Tongyun Li, Qixiang Cheng, Madeleine Glick, Michael Crisp, Keren Bergman, Richard Penty
Summary: Broadband access services are driving the evolution of optical access networks to a more common access platform compatible with both wired and wireless broadband services. This study proposes a reconfigurable converged optical fronthaul network using a silicon photonic switch fabric. Reconfigurable service selection is demonstrated for different switching scenarios, including wavelength selection, multicast, and space switching.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Anthony Rizzo, Asher Novick, Vignesh Gopal, Bok Young Kim, Xingchen Ji, Stuart Daudlin, Yoshitomo Okawachi, Qixiang Cheng, Michal Lipson, Alexander L. Gaeta, Keren Bergman
Summary: Researchers have designed and demonstrated a scalable and compact chip-based link architecture that could enable terabit-scale optical interconnects for hyperscale data centres. By using light and wavelength-division multiplexing with chip-based microresonator Kerr frequency combs, independent information channels can be encoded onto multiple colors of light for parallel data transmission with low energy consumption. They have developed a chip-based silicon photonic data link that can transmit data at 512 Gb/s across 32 independent wavelength channels, with the potential for scaling to hundreds of wavelength channels.
Article
Multidisciplinary Sciences
Chunhui Yao, Kangning Xu, Wanlu Zhang, Minjia Chen, Qixiang Cheng, Richard Penty
Summary: This paper introduces a novel integrated reconstructive spectrometer with programmable photonic circuits using a few engineered MZI elements. The design creates a large number of uncorrelated sampling channels without additional hardware costs, achieving ultra-high resolution. Experimental results demonstrate a bandwidth-to-resolution ratio of over 20,000 using only 729 sampling channels, with a resolution of less than 10 picometers and a bandwidth of over 200 nanometers.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Chunhui Yao, Minjia Chen, Ting Yan, Liang Ming, Qixiang Cheng, Richard Penty
Summary: This paper proposes a novel global sampling strategy with distributed filters to generate ultra-broadband pseudo-random spectral responses. The use of reconfigurable photonics enables the creation of diverse spectral responses and achieves high resolution and bandwidth-to-resolution ratio. The design also provides extra programmability features.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Ang LI, Qixiang Cheng, Yeshaiahu Fainman
Summary: This manuscript discusses the theoretical modeling and experimental characterization of integrated heaters for ultra-long waveguides, highlighting the impact of heater geometry on performance.
