Article
Optics
David Gonzalez-Andrade, Irene Olivares, Raquel Fernandez de Cabo, Jaime Vilas, Antonio Dias, Aitor V. Velasco
Summary: In this paper, a novel three-mode architecture based on multimode interference couplers, passive phase shifters, and cascaded symmetric Y-junctions is presented. The architecture can operate up to the third-order mode by including a single switchable phase shifter. Subwavelength grating metamaterials are exploited to overcome bandwidth limitations, resulting in a simulated bandwidth of 161 nm with low insertion loss and crosstalk.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Weifeng Jiang, Shuangye Xu
Summary: The experimental demonstration of mode-splitting through metamaterial engineering of bridged subwavelength gratings (BSWGs) shows promising results for optical communications and interconnects. The designed device, fabricated using CMOS-compatible processes, exhibits low insertion losses and mode crosstalks, making it a potential candidate for mode manipulation in MDM systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Optics
Svetlana Nikolaevna Khonina, Nikolay Lvovich Kazanskiy, Muhammad Ali Butt, Sergei Vladimirovich Karpeev
Summary: This review presents an attention-grabbing and up-to-date overview of major multiplexing techniques, including wavelength division multiplexing, polarization division multiplexing, space division multiplexing, mode division multiplexing, and orbital angular momentum multiplexing. It also discusses hybrid multiplexing methods and techniques. This unique review paper highlights the most prominent and recent progress in multiplexing techniques in one place.
OPTO-ELECTRONIC ADVANCES
(2022)
Article
Optics
Shanglin Yang, Xin Fu, Jiaqi Niu, Lin Yang, Hanlin Qin, Lin Ma, Tong Zhang, Xiang Yan, Xupei Zhang, Yue Yu
Summary: In this study, a compact dual-mode 3 dB power splitter for mode-division multiplexing (MDM) systems is proposed. The device features a compact and single-connected structure, supporting both TE0 and TE1 modes of power splitting while maintaining the mode order invariant. Experimental results show low insertion loss, indicating its potential in on-chip optical systems.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Engineering, Electrical & Electronic
Yibin Wan, Bo Liu, Yaya Mao, Jianxin Ren, Rahat Ullah, Shuaidong Chen, Xiangyu Wu, Yu Bai, Xiumin Song, Rong Tang, Haojing Zhang, Yongfeng Wu
Summary: This paper proposes a novel chaotic power division multiplexing (CPDM) for secure optical multiple access, which can improve spectral efficiency and user capacity, and ensure information security. Experimental results show that the system can achieve high spectral efficiency and large traffic capacity, and serve more users.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Optics
Shuangxi Zhang, Jianfei Liu, Xiangye Zeng, Jia Lu, Ying Wei, Ruiming Qi
Summary: A modified partitioned frequency domain equalization algorithm is proposed in this paper to address the slow convergence speed and poor equalization effect of digital equalizer in the polarization division multiplexed (PDM)-MDM system. Simulation results show that the modified algorithm can achieve significantly better SER performance and improve the convergence rate compared to the traditional algorithm.
Article
Optics
Xu Han, Yongheng Jiang, Andreas Frigg, Huifu Xiao, Pu Zhang, Thach Giang Nguyen, Andreas Boes, Jianhong Yang, Guanghui Ren, Yikai Su, Arnan Mitchell, Yonghui Tian
Summary: The study investigates the MDM and PDM technologies on a silicon nitride loaded LNOI platform, successfully designing and fabricating a mode (de)multiplexer and a polarization splitter-rotator with low insertion losses and minimal inter-modal crosstalk, suitable for high-capacity data communication applications.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Han Wang, Takeshi Fujisawa, Takanori Sato, Takayoshi Mori, Taiji Sakamoto, Yoko Yamashita, Ryota Imada, Kazuhide Nakajima, Kunimasa Saitoh
Summary: We propose 6-mode and 10-mode photonic lantern mode multiplexers based on two-and three-layer silica planar lightwave circuitry, respectively. The 6-mode multiplexer achieves transmission greater than -0.19 dB at a wavelength of 1550 nm for six different modes. The 10-mode multiplexer is designed to excite selected modes and achieves transmission greater than -1.15 dB at a wavelength of 1550 nm.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yurou Jia, Yimin Liu, Bolun Hu, Wei Xiong, Yechao Bai, Ying Cheng, Dajian Wu, Xiaojun Liu, Johan Christensen
Summary: Multiplexing technology plays a crucial role in acoustic communication, and this study introduces a hybrid mode-frequency-division multiplexer on an acoustic metasurface decorated with carbon nanotube patches. By changing the azimuthal phase distribution, flexible combinations of OAM modes with diverse frequency shifts can be obtained, significantly increasing the communication capacity.
ADVANCED MATERIALS
(2022)
Article
Optics
Ruihuan Zhang, Xingfeng Li, Yu He, Gang Chen, Liangming Xiong, Haoshuo Chen, Nicolas K. Fontaine, Yong Zhang, Weiqiang Xie, Yikai Su
Summary: This article proposes a multimode coupling solution based on a rectangular core few-mode fiber and an integrated multimode coupler to achieve high bandwidth-density optical interconnects. Through corresponding experiments, a bandwidth density of up to 19.4 Tb s mm -1 is achieved at the chip facet, with the DSP power consumption controlled below 6% of a conventional system.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
M. A. Amirabadi, S. A. Nezamalhosseini, M. H. Kahaei, Lawrence R. Chen
Summary: In this paper, a coherent Gaussian noise model is derived considering the dispersion slope and validated through SSFM simulations. Based on the obtained model, the problems of total capacity maximization and minimum signal-to-noise ratio margin maximization are presented and solved. Numerical simulations are conducted in different scenarios, and the results show significant improvement in minimum SNR margin compared to flat power allocation.
OPTICAL FIBER TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Han Wang, Takeshi Fujisawa, Takanori Sato, Masaki Wada, Takayoshi Mori, Taiji Sakamoto, Ryota Imada, Takashi Matsui, Kazuhide Nakajima, Kunimasa Saitoh
Summary: In this paper, two PLC tapered structures are proposed, which enable mode conversions in different scenarios using fast quasiadiabatic dynamics. The lengths of the converters are significantly reduced compared to previous structures, while maintaining high conversion efficiency.
IEICE ELECTRONICS EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Jaewon Oh, Kangmei Li, Jun Yang, Wei Ting Chen, Ming-Jun Li, Paulo Dainese, Federico Capasso
Summary: This study introduces a mode-division multiplexer and demultiplexer design based on a metasurface cavity, which can perform mode conversion and coupling to fibers on a single surface without the need for additional optics. The converted modes have high fidelity due to the optimized phase profile of the metasurface.
Article
Engineering, Electrical & Electronic
Ziming Hong, Rulei Xiao, Yong Zhao, Lianyan Li, Zhanghua Han, Yuechun Shi, Xiangfei Chen
Summary: A method of engineering spectrum of mode converter based on cascaded Bragg gratings is proposed, which allows for higher design flexibility and customization of conversion spectrum. By designing different grating structures, mode converters with specific conversion spectra can be achieved.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Weifeng Jiang, Jinzhu Hu, Siqiang Mao, Hanyu Zhang, Linjie Zhou, B. M. Azizur Rahman
Summary: This study proposes a novel broadband silicon four-mode (de)multiplexer that can (de)multiplex TE0, TE1, TE2, and TE3 modes using subwavelength gratings-assisted triple-waveguide couplers. Experimental results show high bandwidth and low insertion loss, making it suitable for increasing the transmission capacity of on-chip optical interconnects.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Biochemical Research Methods
Kamalpreet K. Gill, Nicolas Riesen, Craig Priest, Nicholas Phillips, Bin Guan, David G. Lancaster
Summary: This paper describes the design and characterization of miniaturized optofluidic devices for sensing, which integrates collimating optical fibers with custom microfluidic chips. Utilizing collimating graded-index fiber tips improves fiber-channel-fiber interfaces and reduces beam divergence and insertion losses compared to standard single-mode fiber. The optofluidic setup allows for absorption spectroscopy measurements with minimal solution volume and comparable sensitivity to traditional cuvettes, suitable for integration into compact lab-on-a-chip systems.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Engineering, Multidisciplinary
Nicolas Riesen, Nicholas Phillips, Linh Nguyen, Stephen C. Warren-Smith, Craig Priest, David G. Lancaster
Summary: This paper provides an analysis of fiber-optic Fabry-Perot interferometers using collimating graded-index fiber tips instead of standard single-mode fibers. It shows that the use of collimated GIF tips can significantly increase fringe visibility at 1550 nm. The study also explores the effects of using capillaries to align the fibers and offers easily accessible design guidelines for fabricating GIF-based devices at 1550 nm.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Lu Peng, Linh Viet Nguyen, Jiawen Li, Nicolas Riesen, Dale Otten, David G. Lancaster, Heike Ebendorff-Heidepriem, Stephen C. Warren-Smith
Summary: A novel technique for detecting and measuring micron-scale optical scatterers using a few-mode exposed-core microstructured optical fiber is proposed, which allows for simultaneous mapping of scatterers with both longitudinal and transverse information.
Article
Chemistry, Physical
Nishita Chowdhury, Nicolas Riesen, Hans Riesen
Summary: A mechanochemical preparation route for nano-crystalline BaLiF3 doped with trivalent Tm3+ is demonstrated, with a focus on the photoluminescence properties of X-irradiation-generated divalent Tm2+. The potential of BaLiF3 as a promising host matrix for luminescence within a broad optical range is highlighted by results comparing different activators such as Tm, Eu, and Sm.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Lu Peng, Nicolas Riesen, Jiawen Li, Mengke Han, Linh Viet Nguyen, Heike Ebendorff-Heidepriem, Stephen C. Warren-Smith
Summary: This study proposes a new WGM coupling scheme using an exposed-core silica fiber (ECF) to overcome the challenges of using fragile fiber tapers. By varying the mode launching conditions in this few-mode ECF, in combination with a Fano resonance effect, a high degree of tunability in the reflection spectrum is demonstrated. Additionally, multi-particle WGM excitation is shown to occur either simultaneously or separately through controlling the ECF mode launching conditions, offering potential applications in optical switches, modulators, biosensing, and multi-point lasing.
Article
Optics
Nicolas Riesen, Nicholas Phillips, David G. Lancaster
Summary: Graded-index optical fiber probes are essential in optical coherence tomography imaging applications for in vivo bioimaging, although they are not commonly used in other photonics applications. This paper presents a numerical study of these fiber tips across a wide range of wavelengths, providing design guidelines for fabricating collimating or focusing fiber tips. Fiber collimators have potential in free-space systems for various devices, while focusing fiber tips are valuable for high-resolution imaging.
Article
Nanoscience & Nanotechnology
Nishita Chowdhury, Nicolas Riesen, Hans Riesen
Summary: The study highlights the potential of BaLiF3 as a host matrix for upconversion sensitizer-activator pairs and demonstrates enhanced upconversion efficiency after annealing. The X-ray storage capability of BaLiF3:Yb3+, Er3+ nanocrystals is explored, showcasing possible applications in X-ray dosimetry and bioimaging.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Nishita Chowdhury, Wayne Hutchison, Nicolas Riesen, Elmars Krausz, Hans Riesen
Summary: We investigated the properties of a unique color center in mechanochemically synthesized inverse perovskite crystals. The color center exhibits luminescence in the near-infrared region with a long lifetime and stable emission intensity. However, it bleaches upon exposure to sunlight.
Article
Chemistry, Physical
Norfadira Wahib, Nicolas Riesen, Hans Riesen
Summary: The generation of Mn4+ in alpha-Al2O3:Mn3+ by soft X-ray exposure is demonstrated, indicating the potential use of alpha-Al2O3:Mn3+ for multilevel optical data storage.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Nicolas Riesen, Kate Badek, Hans Riesen
Summary: Tailoring the effective inhomogeneous line width and line shape through a physical mixture of chemically different matlockite nanocrystals enables broad fluorescence emission line with a top-hat distribution for multiple spectral holes burning at diffraction limit and room temperature, offering the potential for higher optical data densities.
Article
Optics
Yongsop Hwang, Nicholas Phillips, Dale E. Otten, Nicolas Riesen, David G. Lancaster
Summary: The coupling characteristics between a single mode fiber and a waveguide embedded in a glass chip were investigated using a graded index fiber tip. The experimental coupling efficiency reached 88%, which can be further improved by anti-reflection coating. It was demonstrated that a gap can be introduced between the chip waveguide and the fiber tip while maintaining high coupling efficiency.
Article
Chemistry, Analytical
Nicolas Riesen, Zane Q. Peterkovic, Bin Guan, Alexandre Francois, David G. Lancaster, Craig Priest
Summary: The rapid development of optofluidic technologies has led to the demand for sensing platforms that are easy to use, have simple sample manipulation, and provide high performance and sensitivity. This study presents an integrated optofluidic sensor that combines a pillar array-based open microfluidic chip and caged dye-doped whispering gallery mode microspheres. The sensor shows potential for simple real-time monitoring of liquids. The sensor achieves a refractive index sensitivity of approximately 40 nm/RIU and a detection limit of approximately 3 x 10(-3) RIU (approximately 20 mg/mL glucose).
Article
Chemistry, Multidisciplinary
Nicolas Riesen, Craig Priest, David G. G. Lancaster, Kate Badek, Hans Riesen
Summary: Thin films of BaFCl:Sm nanocrystals with a polymer binder were used to create fluorescence images. The films were exposed to UV-C light, resulting in the conversion of Sm3+ to Sm2+ ions and a large linear dynamic range. The red fluorescence of Sm2+ was read-out using blue-violet illumination and a laser scanning confocal microscope, with a resolution equivalent to 125 line pairs per mm or 6400 dpi for 16 greyscale levels. Higher resolutions could be achieved with collimated UV-C laser exposure or higher resolution photomasks. Ultra-high resolution binary fluorescence images with resolutions down to 2 μm (250 line pairs per mm, 12,700 dpi) were also created. The technology could have applications in anti-counterfeiting labeling.
Proceedings Paper
Engineering, Electrical & Electronic
Nicolas Riesen, Kamalpreet Gill, Craig Priest, Nicholas Phillips, Bin Guan, David G. Lancaster
Summary: Absorption spectroscopy is demonstrated using microfluidic devices and collimating graded-index fibers. This optofluidics setup allows for absorption measurements with 10x smaller volumes than standard cuvettes, while maintaining comparable sensitivity.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
Article
Chemistry, Inorganic & Nuclear
Z. Siti Rozaila, Nicolas Riesen, Hans Riesen
Summary: This study reports the photoluminescence and photoionization properties of Sm2+ ions generated by X-irradiation of nanocrystalline CaF2:Sm3+ prepared by coprecipitation. The results indicate the potential applications of Sm-doped CaF2 nanocrystals in dosimetry and X-ray imaging, with the X-irradiated samples displaying specific luminescence peaks both at room temperature and when cooled to around 30K.
DALTON TRANSACTIONS
(2021)
