Article
Nanoscience & Nanotechnology
Rui Tang, Ryota Tanomura, Takuo Tanemura, Yoshiaki Nakano
Summary: Unitary optical processors are computing units designed for ultrafast and energy-efficient unitary matrix-vector multiplications based on interference of coherent optical beams. The use of multiport directional couplers in UOPs shows promise for large-scale integration due to its robustness against fabrication errors. This architecture, demonstrated on a silicon photonic chip, offers flexibility in operations for different polarizations and is suitable for applications in deep learning, optical communication, and quantum information processing.
Article
Optics
Anshuman Singh, Richard Belansky, Moe Soltani
Summary: This article reports on the design and demonstration of silicon photonic ultraflat bandpass filters with low insertion loss and high out-of-band rejection. The filters are cascaded low-order Ring-Assisted Mach-Zehnder Interferometer (RAMZI) filter stages, enabling high rejection of out-of-band signals while maintaining low-order unit cells for tolerance to fabrication imperfections. The filters have low insertion loss, minimal in-band ripple, and a wide tunable range. The study also investigates the filters' dynamic range at high input optical powers, which is important for RF photonics applications.
Article
Multidisciplinary Sciences
Xiaogang Qiang, Yizhi Wang, Shichuan Xue, Renyou Ge, Lifeng Chen, Yingwen Liu, Anqi Huang, Xiang Fu, Ping Xu, Teng Yi, Fufang Xu, Mingtang Deng, Jingbo B. Wang, Jasmin D. A. Meinecke, Jonathan C. F. Matthews, Xinlun Cai, Xuejun Yang, Junjie Wu
Summary: Silicon photonics technology allows for the realization of quantum walks with control over particle exchange symmetry and indistinguishability, simulating single-particle walks on larger graphs and showing potential applications in graph theory algorithms.
Article
Optics
Yohei Saito, Kota Shikama, Tai Tsuchizawa, Norio Sato
Summary: An optical coupling method with high alignment tolerance through self-written waveguide formation shows promise for co-packaged optics in silicon photonics. By devising a new optical circuit, the researchers achieved efficient coupling between a SiPh chip and a standard single-mode fiber, with higher alignment tolerances compared to conventional coupling methods.
Article
Optics
Rui Tang, Makoto Okano, Kasidit Toprasertpong, Shinichi Takagi, Dirk Englund, Mitsuru Takenaka
Summary: This study proposes a novel photonic integrated circuit (PIC) architecture for accelerated matrix multiplication, addressing the issue of hardware errors increasing with device scale in previous architectures. Additionally, a PIC architecture for general matrix-matrix multiplication (GEMM) is developed to enable high-energy efficiency computing on photonic chips.
Article
Engineering, Electrical & Electronic
Alok Das, Guowu Zhang, Hassan Rahbardar Mojaver, Odile Liboiron-Ladouceur
Summary: A novel design approach for scalable 3-port and 4-port mode insensitive multimode switching matrices has been proposed and experimentally demonstrated. The proposed switches showed low insertion loss, low intermodal crosstalk, and clear open eyes for both single-mode and simultaneous two-mode transmissions, validating their scalability for larger port count and higher-order modes.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Optics
Jian Lin, Pengjun Wang, Qiang Fu, Weiwei Chen, Shixun Dai, Dejun Kong, Haoqi Chen, Jun Li, Tingge Dai, Jianyi Yang
Summary: This article presents the design and experimental demonstration of a polarization-insensitive high-order mode pass filter. The filter can filter out TM0 and TE0 modes and output TE1 and TM1 modes. By employing the finite difference time domain method and optimization algorithms, the structural parameters of the photonic crystal region and the tapered coupler are optimized for compactness, broad bandwidth, low insertion loss, excellent extinction ratio, and polarization insensitivity. Measurement results show that the fabricated filter achieves an extinction ratio of 20.42 and insertion loss of 0.32 dB at 1550 nm for TE polarization, and an extinction ratio of 21.43 and insertion loss of 0.30 dB for TM polarization. Within the bandwidth of 1520 to 1590 nm, the filter maintains an insertion loss lower than 0.86 dB and an extinction ratio greater than 16.80 dB for TE polarization, and an insertion loss lower than 0.79 dB and an extinction ratio greater than 17.50 dB for TM polarization.
Article
Physics, Multidisciplinary
Xinru Ji, Junqiu Liu, Jijun He, Rui Ning Wang, Zheru Qiu, Johann Riemensberger, Tobias J. Kippenberg
Summary: This study adapts and optimizes Euler bends to build compact racetrack microresonators based on ultralow-loss, multi-mode, silicon nitride photonic integrated circuits. The researchers quantitatively investigate the suppression of spatial mode interaction and demonstrate the preservation of low optical loss in the microresonators. The optimized Euler bends and racetrack microresonators have potential applications in integrated nonlinear photonic systems and photonic quantum computing.
COMMUNICATIONS PHYSICS
(2022)
Article
Optics
Paramjeet Kaur, Andreas Boes, Guanghui Ren, Thach G. Nguyen, Gunther Roelkens, Arnan Mitchell
Summary: The increasing demand for faster information throughput is driving the development of integrated photonic technology. Research and development of hybrid and heterogeneous photonic integrated circuits have seen significant growth over the past decade, enabling record-breaking experimental demonstrations and suggesting new methods for mass manufacturing integrated circuits.
Article
Optics
Siwei Sun, Ying Chen, Yu Sun, Fengman Liu, Liqiang Cao
Summary: This study introduces a novel fiber-chip edge coupler approach with a large mode size for silicon photonic wire waveguides, achieved through a multiple structure that allows high coupling efficiency between standard optical fibers and sub-micron silicon wire waveguides. The designed edge coupler is fully compatible with standard microfabrication processes.
Article
Engineering, Electrical & Electronic
Julian Webber, Yuichiro Yamagami, Guillaume Ducournau, Pascal Szriftgiser, Kei Iyoda, Masayuki Fujita, Tadao Nagatsuma, Ranjan Singh
Summary: The recent discovery of the topological valley photonic crystal shows promising potential for high-speed inter-device communications with near zero-loss bends, zero back-scattering and zero junction-area features. Experimental results demonstrate low dispersion in the photonic bandgap region as the number of bends increase.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Optics
Zheng Peng, Junbo Feng, Te Du, Hansi Ma, Wei Cheng, Yan Wang, Shengyin Zang, Hao Cheng, Xiaodong Ren, Yubei Shuai, Hao Liu, Jiagui Wu, Junbo Yang
Summary: In this study, a rearrangeable and ultra-compact optical network-on-chip structure was designed, which can be used in nanophotonics computation and networks, with small size and low insertion loss.
Correction
Optics
Mustafa Hammood, Ajay Mistry, Han Yun, Minglei Ma, Stephen Lin, Lukas Chrostowski, Nicolas A. F. Jaeger
Summary: This publisher's note contains corrections to Opt. Lett. 46, 2738 (2021). (C) 2021 Optical Society of America.
Review
Chemistry, Analytical
Haoyang Sun, Qifeng Qiao, Qingze Guan, Guangya Zhou
Summary: In this review, the development and applications of silicon photonic phase shifters were discussed. Different types of phase shifters were introduced, and their working principles were analyzed. The related research work was summarized and compared. Additionally, the emerging applications of phase shifters were presented, and a discussion on each type of phase shifter was provided based on the figures of merit.
Article
Chemistry, Multidisciplinary
Han Ye, Yanrong Wang, Shuhe Zhang, Danshi Wang, Yumin Liu, Mingchao Wang, Qiming Zhang
Summary: This study demonstrates efficient mode conversion in silicon waveguides using digital metamaterials, providing a solution for all-optical interconnections in subwavelength functional regions. Satisfactory solutions, including conversions between six TE polarized modes, can be obtained with a small number of iterations.
NANOSCALE ADVANCES
(2021)
