Article
Optics
Abdelfettah Hadij-ElHouati, Alejandro Ortega-Monux, J. Gonzalo Wanguemert-Perez, Robert Halir, Shurui Wang, Jens H. Schmid, Pavel Cheben, I Molina-Fernandez
Summary: The study introduces a demultiplexer based on a curved grating waveguide structure that separates eight channels around the central wavelength of 1550 nm with a spacing of 10 nm. The fabricated device exhibits very low insertion loss and crosstalk below -25 dB, showcasing the potential of metamaterial index engineering in achieving highly directional lateral emission in waveguide grating design.
Article
Optics
Yuting Xie, Shengqun Guo, Bangyu Li, Lei Xu, Ruimin Huang, Fengjiang Zhuang, Shaojian Su, Zhili Lin, Weibin Qiu
Summary: This article proposes two basic principles to address the astigmatism problem of traditional Rowland gratings. The optical performance of gratings and the structural parameters were analyzed using ray tracing method, and the grating structure was further optimized. Using the proposed principles, a 1 x 4 demultiplexer with an ultracompact footprint was designed, which is suitable for the coarse wavelength division multiplexing system.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Kuo-Fang Chung, Po-Han Fu, Yuan-Ting Shih, Hua-Kung Chiu, Tien-Tsorng Shih, Ding-Wei Huang
Summary: This paper proposes and demonstrates a thermally bi-directionally tunable arrayed waveguide grating (TBDTAWG) on a silicon-on-insulator (SOI) platform. The device utilizes passive and active designs to achieve AWG functionality and fine-tuning of its filtering responses. By employing an S-shaped architecture and two triangular thermal-tuning regions with complementary phase distributions, bi-directional red- and blue-shift tunable functions are achieved.
Article
Optics
Yu Zheng, Yunming Li, Yixiong Yan, Pan Zhang, Ji'an Duan
Summary: This letter presents the design and optimization idea of an ultra-compact echelle grating (EG) demultiplexer based on silicon-on-insulator (SOI) in the O-band for Coarse Wavelength Division Multiplexing (CWDM) systems. The correlation between optical performance and design parameters of the EG device is analyzed using Finite-difference time-domain (FDTD) theory, providing a more accurate optimization reference. Further optimization is achieved by adjusting the blaze angle of the grating facets and the position of the output waveguides based on the simulated field distribution. The device has four channels with a channel spacing of 20 nm and a small footprint of only 140x100 μm2. Simulated insertion loss for all channels is below 2 dB with insertion loss uniformity of less than 1 dB, and the crosstalk is better than 40 dB.
Article
Engineering, Electrical & Electronic
Fuling Wang, Xiao Xu, Chen Zhang, Chonglei Sun, Jia Zhao
Summary: An ultracompact and broadband silicon wavelength demultiplexer based on SWG-assisted directional coupler is designed and demonstrated. It achieves wavelength splitting of 1310 and 1550 nm with a small footprint, high extinction ratios, and wide bandwidths for O-band and C-band.
IEEE PHOTONICS JOURNAL
(2022)
Article
Chemistry, Analytical
Andrei Tsarev
Summary: This new sensor design utilizes collinear diffraction by an asymmetric grating to achieve good volume sensitivity. It transforms the modes of the silicon wire in a water environment and incorporates a mode filter/demultiplexer for wavelength interrogation. The sensor demonstrates high sensitivity and can be manufactured using modern technology.
Article
Optics
Jianfei Liao, Yuan Xie, Tianye Huang, Zhuo Cheng
Summary: This paper presents a subwavelength-grating-assisted 1 x 2 deWMUX based on the principle of multimode interference, successfully outputting 1.55 and 2 µm wavelengths from two different channels. The simulation results demonstrate that the designed deWMUX has high contrast, low insertion loss, and wide 1 dB bandwidth at both wavelengths. Additionally, manufacturing tolerances of the device are also studied in the paper.
Article
Optics
Zakriya Mohammed, Bruna Paredes, Mahmoud Rasras
Summary: We designed and demonstrated an ultra-compact 1310/1550 run wavelength diplexer based on a multimode interference (MMI) coupler. The device showed low insertion loss and high extinction ratio, and displayed a wide 3-dB bandwidth. Additionally, clear eye diagrams were observed for both wavelengths in an on-chip wavelength demultiplexing experiment.
Article
Engineering, Electrical & Electronic
Bocheng Yuan, Yizhe Fan, Shengwei Ye, Yunshan Zhang, Yiming Sun, Xiao Sun, Weiqing Cheng, Song Liang, Yongguang Huang, Ruikang Zhang, Jue Wang, John H. Marsh, Lianping Hou
Summary: This study proposes and experimentally demonstrates a monolithic dual-wavelength DFB laser array based on sidewall gratings and a novel modulation of the grating coupling coefficient. The grating coupling coefficient distribution along the cavity is modulated by changing the alignment between the gratings on the two sidewalls. The frequency difference between the two lasing modes can be modulated by changing the cavity length and grating recess depth. A series of microwave signals in a wide frequency range is observed after beating the two optical lines.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Siqiang Mao, Jinzhu Hu, Hanyu Zhang, Weifeng Jiang
Summary: In this paper, an experimental demonstration of a subwavelength grating assisted on-chip silicon MDM-link is presented. The device utilizes MDM technology to increase communication capacity, and exhibits small size and good performance.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Zhaoguo Xue, Tianqi Jin, Shiwei Xu, Ke Bai, Qi He, Fan Zhang, Xu Cheng, Ziyao Ji, Wenbo Pang, Zhangming Shen, Honglie Song, Yumeng Shuai, Yihui Zhang
Summary: In this article, an ordered assembly strategy is introduced to transform 2D thin films into complex 3D structures on various curved surfaces using predefined mechanical loadings and prestretch techniques. The experimental results demonstrate the effectiveness of this method on different curved substrates, and the assembly structures can be accurately captured by mechanics modeling.
Article
Optics
Manoranjan Minz, Ramesh Kumar Sonkar
Summary: This paper presents a 12-channel hybrid mode-, polarization-, and wavelength-division (de)multiplexer designed on a silicon-on-insulator platform. The device utilizes periodic grating structures for coupling different modes, and the simulation results show promising performance.
Article
Optics
Manoranjan Minz, Ramesh Kumar Sonkar
Summary: This paper presents a hybrid mode and wavelength division (de)multiplexer (MDM-WDM) based on the silicon-on-insulator platform using the grating assisted contra-directional coupling principle. The proposed device can (de)multiplex six channels with two wavelengths and three modes. Simulation and analysis show that the structure exhibits good performance with low insertion loss, high return loss, high extinction ratio, and low crosstalk.
Article
Optics
Xiao Sun, Song Liang, Weiqing Cheng, Shengwei Ye, Yiming Sun, Yongguang Huang, Ruikang Zhang, Jichuan Xiong, Xuefeng Liu, John H. Marsh, Lianping Hou
Summary: In this research, an AlGaInAs multiple-quantum-well photonic integrated circuit device is reported, which can control the state of polarization of the output light source. It consists of a polarization mode converter (PMC), a differential phase shifter (DPS), and a sidewall grating DFB laser. The integration of these components was achieved using a single step of metalorganic vapor-phase epitaxy and two steps of III-V material dry etching.
PHOTONICS RESEARCH
(2023)
Article
Optics
Evangelos Dimopoulos, Meng Xiong, Aurimas Sakanas, Andrey Marchevsky, Gaoneng Dong, Yi Yu, Elizaveta Semenova, Jesper Mork, Kresten Yvind
Summary: This study demonstrates a nano-buried-heterostructure photonic crystal laser with an extremely low threshold power at telecom wavelengths. By reducing the doping-induced losses and efficiently miniaturizing the active region of the laser cavity, this breakthrough achievement has been made. The laser can be directly modulated at a high frequency with low energy consumption, making it suitable for on-chip links.
Article
Chemistry, Inorganic & Nuclear
Ignacio Molina de la Pena, Maria L. Calvo, Ramon F. Alvarez-Estrada
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
(2019)
Article
Engineering, Electrical & Electronic
Alaine Herrero-Bermello, Jose Manuel Luque-Gonzalez, Robert Halir, Pavel Cheben, Alejandro Ortega-Monux, Inigo Molina-Fernandez, Aitor V. Velasco
IEEE PHOTONICS JOURNAL
(2019)
Article
Optics
David Gonzalez-Andrade, Sylvain Guerber, Elena Duran-Valdeiglesias, Diego Perez-Galacho, Xavier Le Roux, Nathalie Vulliet, Sebastien Cremer, Stephane Monfray, Eric Cassan, Delphine Marris-Morini, Frederic Boeuf, Pavel Cheben, Laurent Vivien, Aitor V. Velasco, Carlos Alonso-Ramos
Article
Engineering, Electrical & Electronic
Umair A. Korai, Alaine H. Bermello, Michael J. Strain, Ivan Glesk, Aitor V. Velasco
IEEE PHOTONICS JOURNAL
(2019)
Article
Optics
I. Molina de la Pena, M. L. Calvo, R. F. Alvarez-Estrada
JOURNAL OF MODERN OPTICS
(2020)
Article
Optics
Thi Thuy Duong Dinh, David Gonzalez-Andrade, Miguel Montesinos-Ballester, Lucas Deniel, Bertrand Szelag, Xavier Le Roux, Eric Cassan, Delphine Marris-Morini, Laurent Vivien, Pavel Cheben, Aitor V. Velasco, Carlos Alonso-Ramos
Summary: Silicon photonics on-chip spectrometers, particularly the spatial heterodyne Fourier transform spectrometers (SHFTSs), have shown potential in various fields such as medical diagnostics, pollution monitoring, and astrophysics. A recent advancement in this technology demonstrated an SHFTS with wide-area light collection and 16 interferometers, achieving high spectral resolution and increased etendue compared to conventional devices.
Article
Engineering, Multidisciplinary
I Molina de la Pena, M. L. Calvo, R. F. Alvarez-Estrada
Summary: The new method efficiently computes scalar wave propagation with Dirichlet boundary conditions, handling various scenarios and utilizing Fast Fourier Transform for simulations, showing superior performance in terms of running time and memory load compared to Finite Differences Methods.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Optics
Thi Thuy Duong Dinh, Xavier Le Roux, Natnicha Koompai, Daniele Melati, Miguel Montesinos-Ballester, David Gonzalez-Andrade, Pavel Cheben, Aitor V. Velasco, Eric Cassan, Delphine Marris-Morini, Laurent Vivien, Carlos Alonso-Ramos
Summary: Integrated mid-infrared micro-spectrometers show great potential for environmental monitoring and space exploration. The use of silicon-on-insulator (SOI) as a platform for integration is promising due to its capability for large volume and low-cost production of compact photonic circuits. However, the limitation of the strong absorption of the buried oxide layer in SOI for wavelengths beyond 4 μm is overcome by utilizing metamaterial-cladded suspended silicon waveguides to implement a spatial heterodyne Fourier-transform (SHFT) spectrometer operating at wavelengths near 5.5 μm.
Article
Physics, Multidisciplinary
I Molina de la Pena, R. F. Alvarez-Estrada, M. L. Calvo
Summary: This study investigates the interaction between an incoming slow neutron and a straight semi-infinite material waveguide. The waveguide creates an attractive potential on the neutron, resulting in reflection, scattering, and confined propagation. New 3D scattering integral equations are proposed to address the difficulties arising from the infinite length of the waveguide and specific propagation modes. Approximate formulas for probability amplitudes and fluxes are provided, and applications and numerical computations for two-dimensional media and waveguides are presented.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Engineering, Electrical & Electronic
Jaime Vilas, Raquel Fernandez de Cabo, Irene Olivares, David Gonzalez-Andrade, Aitor V. Velasco, Antonio Dias-Ponte
Summary: In this study, a compact directional coupler based on subwavelength metamaterials is proposed to achieve arbitrary coupling ratios with low losses and a flat spectral response.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Proceedings Paper
Optics
Raquel Fernandez de Cabo, Jaime Vilas, Pavel Cheben, Aitor V. Velasco, David Gonzalez-Andrade
Summary: This article proposes an ultra-broadband and fabrication-tolerant symmetric Y-junction utilizing subwavelength metamaterials. Experimental results show that the TE0 excess loss remains below 0.3 dB over a bandwidth of 260 nm (1420-1680 nm), even in the presence of fabrication deviations of +/- 10 nm. Additionally, our power splitter exhibits excess loss lower than 1 dB for the TE1 mode within 1475-1575 nm.
2022 PHOTONICS NORTH (PN)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
R. Halir, A. Sanchez-Postigo, J. M. Luque-Gonzalez, A. Hadij-ElHouati, D. Pereira-Martin, J. Leuermann, P. Ginel-Moreno, C. Perez-Armenta, A. Torres-Cubillo, A. Herrero-Bermello, A. Dias-Ponte, D. Gonzalez-Andrade, A. V. Velasco, J. G. Wanguemert-Perez, A. Ortega-Monux, J. de-Oliva-Rubio, P. Cheben, J. H. Schmid, J. Ctyroky, M. Nedeljkovic, G. Z. Mashanovich, I Molina-Fernandez
Summary: The report highlights advances in using subwavelength metamaterials for silicon photonic devices, such as narrowband filters, antennas, polarization handling, on-chip beam forming, and sensing.
2021 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXPOSITION (OFC)
(2021)
Proceedings Paper
Education, Scientific Disciplines
Ignacio Moreno, Maria J. Yzuel, Maria L. Calvo
OPTICS EDUCATION AND OUTREACH VI
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Maria. L. Calvo, Ignacio Molina de la Pena, Ramon F. Alvarez-Estrada
FOURTH INTERNATIONAL CONFERENCE ON APPLICATIONS OF OPTICS AND PHOTONICS
(2019)
Article
Optics
Maria J. Yzuel, Ignacio Moreno, Maria L. Calvo
OPTICA PURA Y APLICADA
(2019)
