Optimum light transmission via microring resonator under a lossy‐coupler critical coupling condition

2020 ◽  
Vol 63 (2) ◽  
pp. 653-661
Author(s):  
Mahdi Bahadoran ◽  
Preecha Yupapin ◽  
Iraj Sadegh Amiri
Keyword(s):  
Light Transmission ◽  
Microring Resonator ◽  
Critical Coupling ◽  
Coupling Condition

scholarly journals High-Q-Factor Tunable Silica-Based Microring Resonators

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 256
Author(s):  
Yue-Xin Yin ◽  
Xiao-Pei Zhang ◽  
Xiao-Jie Yin ◽  
Yue Li ◽  
Xin-Ru Xu ◽  
...  
Keyword(s):  
Optical Communications ◽  
Microring Resonator ◽  
Microring Resonators ◽  
Q Factor ◽  
Notch Depth ◽  
Critical Coupling ◽  
Practical Application ◽  
Coupling Condition ◽  
High Q ◽  
Racetrack Resonator

A high-Q-factor tunable silica-based microring resonator (MRR) is demonstrated. To meet the critical-coupling condition, a Mach–Zehnder interferometer (MZI) as the tunable coupler was integrated with a racetrack resonator. Then, 40 mW electronic power was applied on the microheater on the arm of MZI, and a maximal notch depth of about 13.84 dB and a loaded Q factor of 4.47 × 106 were obtained. The proposed MRR shows great potential in practical application for optical communications and integrated optics.

scholarly journals Dual-guiding-layer resonance structure with an embedded metasurface for quasi-critical coupling without a perfect mirror

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Gyeong Cheol Park ◽  
Kwangwook Park
Keyword(s):  
Refractive Index ◽  
High Refractive Index ◽  
Decay Rates ◽  
Single Layer Graphene ◽  
Resonance Structure ◽  
Critical Coupling ◽  
Coupling Condition ◽  
Perfect Absorption ◽  
High Background ◽  
Absorbing Material

Abstract We propose an all-dielectric quasi-one-port resonance structure that achieves near perfect absorption without the use of a back mirror. The structure mainly consists of a high-refractive-index silicon metasurface and surrounding high-refractive-index guiding layers. The dual-guiding-layer (DGL) structure has high background reflectance and is designed to have a ratio of two decay rates into the upper and lower regions within a wider range. When an absorbing material is introduced into a DGL system, it can be designed to achieve a near critical-coupling condition by reducing the constraints in the two decay rates. By using single-layer graphene as an absorbing material, the DGL resonance structure shows an absorption of ~ 97% and a phase change of ∼ 0.95π near the wavelength of 1550 nm, confirming quasi-critical coupling. The optimized DGL structure is relatively insensitive to potential fabrication imperfections, and consequently, the expected average peak wavelength and absorption are obtained as 1549.29 nm and 96.74%, respectively. Angle-dependent absorption confirms that maximum absorption occurs under normal incidence. The DGL absorber is also designed to cover the whole C-band region, in order to meet the quasi-critical-coupling condition. All mode profiles are similarly quasi-symmetric along the metasurface due to the same DGL resonance mechanism.

scholarly journals Output Voltage Analysis of Inductive Wireless Power Ttransfer with Series LC and LLC Resonance Operations Depending on Coupling Condition

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 592 ◽  
Author(s):  
KangHyun Yi
Keyword(s):  
Output Power ◽  
Output Voltage ◽  
Maximum Output Power ◽  
Maximum Output ◽  
Voltage Gain ◽  
Wireless Power ◽  
Critical Coupling ◽  
Coupling Condition ◽  
Load Variation ◽  
Receiving Coil

This paper analyzes the output voltage of an inductive wireless power transfer (WPT) depending on coupling conditions. When the optimum efficiency and maximum output power are obtained, it is called critical coupling, so the receiving coil and the transmitting coil should be separated by a certain distance. When the distance between the transmitting coil and receiving coil is very short, it is called over coupling, and output power decreases with the optimal operating state of the critical coupling condition. To design the entire circuit system for the inductive WPT depending on the coupling condition, it is beneficial to analyze the output voltage according to a load variation, an input voltage, and an operating frequency. Therefore, the output voltage depending on the coupling condition in the inductive WPT is analyzed in this paper. The output voltage gain in critical coupling condition is greater than one and is not affected by a load variation by a series LC resonant operation. The reduced output power in an over coupling condition can be recovered by a series LLC resonant operation. In addition, the output voltage gain is almost one and is affected by the load variation in the over coupling condition. A 5W prototype is implemented with the wireless power consortium standard coils and experimental results are shown to verify theoretical analysis and operation.

scholarly journals A semi-empirical integrated microring cavity approach for 2D material optical index identification at 1.55 μm

Nanophotonics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 435-441 ◽  
Author(s):  
Rishi Maiti ◽  
Rohit A. Hemnani ◽  
Rubab Amin ◽  
Zhizhen Ma ◽  
Mohammad H. Tahersima ◽  
...  
Keyword(s):  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Semiempirical Method ◽  
Building Blocks ◽  
Microring Resonator ◽  
Coupling Condition ◽  
2D Material ◽  
Optical Index ◽  
Wide Range ◽  
Tunable Coupling

AbstractAtomically thin 2D materials such as transition metal dichalcogenides (TMDs) provide a wide range of basic building blocks with unique properties, making them ideal for heterogeneous integration with a mature chip platform for advances in optical communication technology. The control and understanding of the precise value of the optical index of these materials, however, is challenging, as the standard metrology techniques such as the millimeter-large ellipsometry is often not usable due the small lateral 2D material flake dimension. Here, we demonstrate an approach of passive tunable coupling by integrating few layers of MoTe2 onto a microring resonator connected to a waveguide bus. We find the TMD-to-ring circumference coverage length ratio required to precisely place the ring into a critical coupling condition to be about 10% as determined from the variation of spectral resonance visibility and loss as a function of TMD coverage. Using this TMD-ring heterostructure, we further demonstrate a semiempirical method to determine the index of a 2D material (nMoTe2 of 4.36+0.011i) near telecommunication-relevant wavelength. The placement, control, and optical property understanding of 2D materials with integrated photonics pave the way for further studies of active 2D material-based optoelectronics and circuits.

scholarly journals Critically coupled Fabry–Perot cavity with high signal contrast for refractive index sensing

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gyeong Cheol Park ◽  
Kwangwook Park
Keyword(s):  
Refractive Index ◽  
Wavelength Range ◽  
Near Infrared ◽  
Optical Cavity ◽  
High Signal ◽  
Critical Coupling ◽  
Coupling Condition ◽  
Perfect Absorption ◽  
Fabry Perot ◽  
Signal Contrast

AbstractPerfect absorption at a resonance wavelength and extremely low absorption at the wavelength range of off-resonance in a one-port optical cavity is required for refractive index (RI) sensing with high signal contrast. Here, we propose and analyze an absorption-enhanced Fabry–Perot (MAFP) cavity based on a critical coupling condition in a near-infrared wavelength range. For a one-port cavity, a thick bottom Au is used as a mirror and an absorber. To achieve the critical coupling condition, a top dielectric metasurface is employed and tailored to balance the radiation coupling and the absorption coupling rates, and the one-port cavity is theoretically analyzed using temporal coupled-mode theory. We investigate two types of MAFP structures for gas and liquid. The gas MAFP cavity shows a sensitivity of ~ 1388 nm/RIU and a full-width at half-maximum of less than 0.7 nm. This MAFP cavity resolves the RI change of 5 × 10−4 with a reflectance signal margin of 50% and achieves a signal contrast of ~ 100%. The liquid MAFP cavity shows a sensitivity of ~ 996 nm/RIU when RI of liquid changes from 1.30 to 1.38. With tailoring the period of the metasurface maintaining its thickness, a signal contrast of ~ 100% is achieved for each specific RI range.

Plasmonic racetrack resonator with high extinction ratio under critical coupling condition

2010 ◽  
Vol 107 (12) ◽  
pp. 124517 ◽  
Author(s):  
Xiaolei Wang ◽  
Pei Wang ◽  
Chunchong Chen ◽  
Junxue Chen ◽  
Yonghua Lu ◽  
...  
Keyword(s):  
Extinction Ratio ◽  
Critical Coupling ◽  
Coupling Condition ◽  
High Extinction Ratio ◽  
Racetrack Resonator

THEORETICAL STUDY ON SLOW-LIGHT GENERATED BY INTEGRATED MICRORING RESONATOR WITH WIDE BANDWIDTH AND HIGH GAIN

2016 ◽  
Vol 78 (3) ◽  
Author(s):  
M. S. Aziz ◽  
M. S. Affandi ◽  
S. Daud ◽  
M. Bahadoran ◽  
K. T. Chaudhary ◽  
...  
Keyword(s):  
Slow Light ◽  
Ring Resonator ◽  
Light Transmission ◽  
High Gain ◽  
Microring Resonator ◽  
Buildup Factor ◽  
Optical Transfer Function ◽  
Signal Pulse ◽  
Transform Method ◽  
Large Bandwidth

We proposed a new approach to generate slow light transmission with large bandwidth and high buildup factor by using a soliton pulse propagating within integrated ring resonator circuit. The system consisted series of micron-size ring resonator fabricated by using nonlinear InGaAsP/InP material that are laterally coupled together.  For convenience of analysis, optical transfer function for this model is obtained by using z-transform method. Slow light performances were modeled and discuss in this paper. Intensity buildup induced within the series of rings located at left and right sides of the system while strong nonlinear Kerr effect and mutual coupling leads to the spreading frequency bands within the device. Numerical simulation verifies that signal pulse with 45 ps relative delay time and bandwidth of 5.9 GHz (47 pm) are obtained at the communication wavelength around 1550 nm for a 100 ps signal pulse. 

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