scholarly journals Design for tunable optofluidic optical coupler with large dynamic range

2020 ◽  
Vol 34 (25) ◽  
pp. 2050264
Author(s):  
Xionggui Tang ◽  
Fang Meng
Keyword(s):  
Simple Structure ◽  
Dynamic Range ◽  
Beam Propagation Method ◽  
Microfluidic Channel ◽  
Optical Loss ◽  
Optical Power ◽  
Optical Coupler ◽  
New Approach ◽  
Directional Coupling ◽  
Wide Potential

A novel scheme for tunable optofluidic optical coupler is proposed by combining directional coupling waveguide structures with microfluidic channel. The normalized optical power at two output ports can be dynamically manipulated by controlling the refractive index of liquid mixture in microfluidic channel. Its optical performance is numerically investigated by employing the beam propagation method (BPM). The simulated results show that the dynamic range of over 45 dB, and optical loss of below 0.06 dB can be easily achieved, and furthermore the dependence of polarization states and operation wavelength in the range from 1500 nm to 1600 nm are very low in our designed device. In addition, the tunable optofluidic coupler has advantages including simple structure and large fabrication tolerance. Accordingly, our proposed device offers a new approach for manipulating optical power output, which has wide potential application in optofluidic systems.

scholarly journals Distributed Fiber Optical Technology for Damage Identification of Engineering Structure

2018 ◽  
Vol 14 (06) ◽  
pp. 17
Author(s):  
Xiaoma Dong ◽  
Liqiang Zhou
Keyword(s):  
Optical Fiber ◽  
Model Test ◽  
Damage Identification ◽  
Dynamic Range ◽  
Optical Loss ◽  
Rock Foundation ◽  
Rock Slide ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Interface Slip

<p class="0abstract"><span lang="EN-US">To conduct optical fiber monitoring rock slide model test and optical fiber monitoring of steel concrete interface slip model test, the large triaxial shear test of geotechnical engineering </span><span lang="EN-US">wa</span><span lang="EN-US">s used. First, the data of sliding distance and optical loss and their dynamic range </span><span lang="EN-US">we</span><span lang="EN-US">re obtained. Second, the slide distance and fiber loss relation curve and the fitting equation </span><span lang="EN-US">we</span><span lang="EN-US">re worked out. Finally, the typical applications of optical fiber sensing technology in Rock Engineering (high slope engineering, rock foundation of Dam Engineering) slope stability and geological disaster monitoring </span><span lang="EN-US">we</span><span lang="EN-US">re put forward.</span><span lang="EN-US">The results showed that optical fiber sensing was very sensitive, and the loss value was 30 to 50dB. The dynamic range of rock slide monitoring fiber was 3 to 3.5mm, and the dynamic range of the interface slip monitoring fiber was 1.6mm. Thus, the sensing system can detect the sliding process of the interface between the concrete and the steel plate. It provides some reference for the sliding monitoring of the composite materials.</span></p>

scholarly journals Ultracompact on-chip photothermal power monitor based on silicon hybrid plasmonic waveguides

Nanophotonics ◽  
2017 ◽  
Vol 6 (5) ◽  
pp. 1121-1131 ◽  
Author(s):  
Hao Wu ◽  
Ke Ma ◽  
Yaocheng Shi ◽  
Lech Wosinski ◽  
Daoxin Dai
Keyword(s):  
Silicon Oxide ◽  
Dynamic Range ◽  
Optical Power ◽  
Wheatstone Bridge ◽  
Response Speed ◽  
Electrical Signal ◽  
Metal Strip ◽  
Plasmonic Waveguides ◽  
Insulator Layer ◽  
On Chip

AbstractWe propose and demonstrate an ultracompact on-chip photothermal power monitor based on a silicon hybrid plasmonic waveguide (HPWG), which consists of a metal strip, a silicon core, and a silicon oxide (SiO2) insulator layer between them. When light injected to an HPWG is absorbed by the metal strip, the temperature increases and the resistance of the metal strip changes accordingly due to the photothermal and thermal resistance effects of the metal. Therefore, the optical power variation can be monitored by measuring the resistance of the metal strip on the HPWG. To obtain the electrical signal for the resistance measurement conveniently, a Wheatstone bridge circuit is monolithically integrated with the HPWG on the same chip. As the HPWG has nanoscale light confinement, the present power monitor is as short as ~3 μm, which is the smallest photothermal power monitor reported until now. The compactness helps to improve the thermal efficiency and the response speed. For the present power monitor fabricated with simple fabrication processes, the measured responsivity is as high as about 17.7 mV/mW at a bias voltage of 2 V and the power dynamic range is as large as 35 dB.

scholarly journals An Optical Power Divider Based on Mode Coupling Using GaN/Al2O3 for Underwater Communication †

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 63 ◽  
Author(s):  
Retno Wigajatri Purnamaningsih ◽  
Nji Raden Poespawati ◽  
Tomy Abuzairi ◽  
Elhadj Dogheche
Keyword(s):  
Mode Coupling ◽  
Beam Propagation Method ◽  
Optical Power ◽  
Optical Signal ◽  
Power Divider ◽  
Underwater Communication ◽  
Propagation Length ◽  
Excess Loss ◽  
Rectangular Waveguides ◽  
Coupling Phenomena

This paper details the design of a 1 × 8 optical power divider, using a gallium nitride (GaN) semiconductor on sapphire, which can be applied to underwater optical wireless communication. The design consists of nine parallel rectangular waveguides which are based on mode coupling phenomena. Analysis of the design was performed using the beam propagation method (BPM). The optimization was conducted using the 3D finite difference (FD)-BPM method with an optical signal input at the wavelength required for maritime application of λ = 0.45 µm. The signal was injected into the central waveguide. The results showed that at a propagation length of 1480 µm the optical power is divided into eight output beams with an excess loss of 0.46 dB and imbalance of 0.51 dB. The proposed design can be further developed and applied in future underwater communication technology.

Simultaneous Force and Stiffness Control of a Pneumatic Actuator

2007 ◽  
Vol 129 (4) ◽  
pp. 425-434 ◽  
Author(s):  
Xiangrong Shen ◽  
Michael Goldfarb
Keyword(s):  
Dynamic Range ◽  
Variable Stiffness ◽  
Pneumatic Actuator ◽  
Force Output ◽  
New Approach ◽  
Control Approach ◽  
Simultaneous Control ◽  
Output Force ◽  
Maximum Minimum ◽  
Series Elastic

This paper proposes a new approach to the design of a robot actuator with physically variable stiffness. The proposed approach leverages the dynamic characteristics inherent in a pneumatic actuator, which behaves in essence as a series elastic actuator. By replacing the four-way servovalve used to control a typical pneumatic actuator with a pair of three-way valves, the stiffness of the series elastic component can be modulated independently of the actuator output force. Based on this notion, the authors propose a control approach for the simultaneous control of actuator output force and stiffness. Since the achievable output force and stiffness are coupled and configuration-dependent, the authors also present a control law that provides either maximum or minimum actuator output stiffness for a given displacement and desired force output. The general control and maximum/minimum stiffness approaches are experimentally demonstrated and shown to provide high fidelity control of force and stiffness, and additionally shown to provide a factor of 6 dynamic range in stiffness.

scholarly journals Optical Power Splitter Based on Single Mode Directional Coupler Waveguide Using SnO2 Nanomaterial

2021 ◽  
Vol 2110 (1) ◽  
pp. 012005
Author(s):  
M Khoiro ◽  
Asnawi ◽  
R A Firdaus ◽  
M A Bustomi
Keyword(s):  
Directional Coupler ◽  
Beam Propagation Method ◽  
Optical Power ◽  
Single Mode ◽  
Optical Telecommunication ◽  
Propagation Loss ◽  
Coupling Length ◽  
Power Splitter ◽  
Supporting Material ◽  
Lower Refractive Index

Abstract Optical power splitter based on waveguide had been simulated numerically using Finite Difference Beam Propagation Method (FDBPM). Proposed waveguide was designed in the form of simple directional coupler waveguide. The waveguide was contained SnO2 nanomaterial as film or the guide part and the other supporting material as cladding with lower refractive index such as flint glasses. The waveguide used 2 μm of width to establish single-mode waveguide. The structure of waveguide is divided into three parts such as input, coupling and output part. While the waveguide was modified with angle in input and output parts to avoid coupling between waveguides. Furthermore, the proposed waveguide was analysed by varying the angle and coupling length. The analysed result shows that the waveguide has best performance in angle of 0.5 degrees and coupling length of 300 μm when the propagation loss was around 0.53%. Using the parameter, the output distribution percentage of waveguide approached 55%:44.5%. This performance indicated that the proposed waveguide can be used as optical power splitter. The application is very useful for optical telecommunication networking development.

scholarly journals Modeling and Analysis of Opto-Fluidic Sensor for Lab-On- a-Chip Application

2017 ◽  
Author(s):  
Venkatesha M. ◽  
Chaya B. M. ◽  
Pattnaik P. K. ◽  
Narayan K.
Keyword(s):  
Continuous Flow ◽  
Microfluidic Channel ◽  
Optical Loss ◽  
Lab On A Chip ◽  
Single Mode ◽  
Fluidic Channel ◽  
Modeling And Analysis ◽  
Micro Particles ◽  
Sensing Applications ◽  
Integrated Optical

In this work modeling and analysis of an integrated opto-fluidic sensor, with a focus on achievement of single mode optical confinement and continuous flow of micro particles in the microfluidic channel for Lab-on-a Chip (LOC) sensing application is presented. This sensor consists of integrated optical waveguides, microfluidic channel among other integrated optical components. A continuous flow of micro particles in a narrow fluidic channel is achieved by maintaining the two sealed chambers at different temperatures and by maintaining a constant pressure of 1Pa at the centroid of narrow fluidic channel geometry. The analysis of silicon on insulator (SOI) integrated optical waveguide at an infrared wavelength of 1550nm for single mode sensing operation is presented. The optical loss is found to be 0.0005719dB/cm with an effective index of 2.2963. The model presented in this work can be effectively used to detect the nature of micro particles and continuous monitoring of pathological parameters for sensing applications.

scholarly journals Dynamic interferometric measurement with extended unambiguity range in flow measurement

2018 ◽  
Vol 180 ◽  
pp. 02087
Author(s):  
Pavel Psota ◽  
Roman Doleček ◽  
Vít Lédl ◽  
Tomáš Vít
Keyword(s):  
Dynamic Range ◽  
Measured Quantity ◽  
New Approach ◽  
Phase Fields ◽  
Key Factor ◽  
Phase Map ◽  
The Difference ◽  
The Fourier Transform ◽  
Synthetic Phase ◽  
Extended Dynamic

This paper reports on a new approach to measure dynamic processes in fluid mechanics using interferometry with extended dynamic range. A key factor is the use of two wavelengths and the recording of interferograms from both wavelengths in one frame. Phase map evaluation is based on the Fourier transform. The difference between the obtained phase fields creates a synthetic phase whose dynamic range also covers large changes of the measured quantity.

Functionplane—A new approach to simple structure rotation

Psychometrika ◽  
1974 ◽  
Vol 39 (1) ◽  
pp. 37-51 ◽  
Author(s):  
Jeffrey Owen Katz ◽  
F. James Rohlf
Keyword(s):  
Simple Structure ◽  
New Approach ◽  
Simple Structure Rotation

Design and Linear Fitting of High Sensitive Optical Power Meter

2010 ◽  
Vol 171-172 ◽  
pp. 429-432
Author(s):  
Wen Jia Lu ◽  
Yi Wei ◽  
Yi Fan Zhao
Keyword(s):  
Dynamic Range ◽  
Optical Power ◽  
High Sensitivity ◽  
Measured Data ◽  
Construction Monitoring ◽  
Linear Fitting ◽  
Power Meter ◽  
Standard Data ◽  
Measurement Results ◽  
Multi Wavelength

This paper introduces the hardware design of digital optical power meters and the algorithm flow.The power meter detector, with InGaAs-PIN photodiode and LTC6078,is used as a preamplifier for the measurement of micro-current;Silicon Laps C8051f410 are selected as the micro-controller for AD quantification and data processing, and the linear fitting of the measured data and standard data is completed in Matlab environment.After the comparison between the two measurement results,the proposed optical power meter adopts certain algorithm to compensate the deviation and improve the overall performance.The analyses of measured data show that:the optical power meter can be designed to precisely measure multi-wavelength with wide dynamic range and high sensitivity,support AC and DC dual power supply,and be portable.Therefore It also can be used both by university laboratories for teaching and by government department for construction monitoring and optical communications maintenance.

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