scholarly journals Effects of taper parameters on free spectral range of non-adiabatic tapered optical fibers for sensing applications

2016 ◽  
Vol 58 (4) ◽  
pp. 798-803 ◽  
Author(s):  
B. Musa ◽  
Y. Mustapha Kamil ◽  
M. H. Abu Bakar ◽  
A. S. M. Noor ◽  
A. Ismail ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Spectral Range ◽  
Free Spectral Range ◽  
Sensing Applications

Free spectral range variations of grating-based Fabry–Perot filters photowritten in optical fibers

1995 ◽  
Vol 12 (8) ◽  
pp. 1687 ◽  
Author(s):  
S. Legoubin ◽  
S. Boj ◽  
E. Delevaque ◽  
M. Douay ◽  
P. Bernage ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Spectral Range ◽  
Free Spectral Range ◽  
Fabry Perot

scholarly journals Giant Displacement Sensitivity Using Push-Pull Method in Interferometry

Photonics ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 23
Author(s):  
Paulo Robalinho ◽  
Orlando Frazão
Keyword(s):  
Optical Fibers ◽  
Spectral Range ◽  
Free Spectral Range ◽  
Maximum Sensitivity ◽  
Displacement Sensor ◽  
Maximum Performance ◽  
Displacement Sensors ◽  
Wide Range ◽  
Displacement Sensitivity ◽  
Vernier Effect

We present a giant sensitivity displacement sensor combining the push-pull method and enhanced Vernier effect. The displacement sensor consists in two interferometers that are composed by two cleaved standard optical fibers coupled by a 3 dB coupler and combined with a double-sided mirror. The push pull-method is applied to the mirror creating a symmetrical change to the length of each interferometer. Furthermore, we demonstrate that the Vernier effect has a maximum sensitivity of two-fold that obtained with a single interferometer. The combination of the push-pull method and the Vernier effect in the displacement sensors allows a sensitivity of 60 ± 1 nm/μm when compared with a single interferometer working in the same free spectral range. In addition, exploring the maximum performance of the displacement sensors, a sensitivity of 254 ± 6 nm/μm is achieved, presenting a M-factor of 1071 and MVernier of 1.9 corresponding to a resolution of 79 pm. This new solution allows the implementation of giant-sensitive displacement measurement for a wide range of applications.

scholarly journals Temperature Sensor Based on Periodically Tapered Optical Fibers

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8358
Author(s):  
Bartlomiej Guzowski ◽  
Mateusz Łakomski
Keyword(s):  
Linear Function ◽  
Optical Fibers ◽  
Spectral Range ◽  
Temperature Sensor ◽  
Simple Structure ◽  
Free Spectral Range ◽  
Temperature Response ◽  
Temperature Range ◽  
Fabrication And Characterization

In this paper, the fabrication and characterization of a temperature sensor based on periodically tapered optical fibers (PTOF) are presented. The relation between the geometry of the sensors and sensing ability was investigated in order to find the relatively simple structure of a sensor. Four types of PTOF structures with two, four, six and eight waists were manufactured with the fusion splicer. For each PTOF type, the theoretical free spectral range (FSR) was calculated and compared with measurements. The experiments were conducted for a temperature range of 20–70 °C. The results proved that the number of the tapered regions in PTOF is crucial, because some of the investigated structures did not exhibit the temperature response. The interference occurring inside the structures with two and four waists was found be too weak and, therefore, the transmission dip was hardly visible. We proved that sensors with a low number of tapered regions cannot be considered as a temperature sensor. Sufficiently more valuable results were obtained for the last two types of PTOF, where the sensor’s sensitivity was equal to 0.07 dB/°C with an excellent linear fitting (R2 > 0.99). The transmission dip shift can be described by a linear function (R2 > 0.97) with a slope α > 0.39 nm/°C.

Dispersion properties of single-mode optical fibers in telecommunication region: poly (methyl methacrylate) (PMMA) versus silica

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hassan Pakarzadeh ◽  
Seyed Mostafa Rezaei ◽  
Mostafa Taghizadeh ◽  
Forough Bozorgzadeh
Keyword(s):  
Methyl Methacrylate ◽  
Optical Fibers ◽  
Spectral Range ◽  
Structural Parameters ◽  
Practical Importance ◽  
Single Mode ◽  
Dispersion Characteristics ◽  
Poly Methyl Methacrylate ◽  
Dispersion Wavelength ◽  
Zero Dispersion Wavelength

AbstractIn this paper, the dispersion characteristics of two standard single-mode optical fibers (SMFs), fabricated with silica and poly (methyl methacrylate) (PMMA) are studied in telecommunication spectral regions. The effect of structural parameters, such as the radius of the fiber core and the relative core-cladding index difference, is numerically investigated. It is found that over whole spectral range, the PMMA-based SMF shows lower dispersion than the silica SMF. Also, the zero-dispersion wavelength (ZDW) of PMMA-based SMF is longer than that of silica fiber. The results may be of practical importance for the telecommunication applications.

scholarly journals A Nanoplasmonic-Based Biosensing Approach for Wide-Range and Highly Sensitive Detection of Chemicals

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1961
Author(s):  
Francesco Arcadio ◽  
Luigi Zeni ◽  
Aldo Minardo ◽  
Caterina Eramo ◽  
Stefania Di Di Ronza ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Limit Of Detection ◽  
Slab Waveguide ◽  
Grating Pattern ◽  
Transparent Substrate ◽  
Synthetic Receptor ◽  
Sensing Applications ◽  
Wide Range ◽  
Plastic Optical Fibers ◽  
Highly Sensitive Detection

In a specific biosensing application, a nanoplasmonic sensor chip has been tested by an experimental setup based on an aluminum holder and two plastic optical fibers used to illuminate and collect the transmitted light. The studied plasmonic probe is based on gold nanograting, realized on the top of a Poly(methyl methacrylate) (PMMA) chip. The PMMA substrate could be considered as a transparent substrate and, in such a way, it has been already used in previous work. Alternatively, here it is regarded as a slab waveguide. In particular, we have deposited upon the slab surface, covered with a nanograting, a synthetic receptor specific for bovine serum albumin (BSA), to test the proposed biosensing approach. Exploiting this different experimental configuration, we have determined how the orientation of the nanostripes forming the grating pattern, with respect to the direction of the input light (longitudinal or orthogonal), influences the biosensing performances. For example, the best limit of detection (LOD) in the BSA detection that has been obtained is equal to 23 pM. Specifically, the longitudinal configuration is characterized by two observable plasmonic phenomena, each sensitive to a different BSA concentration range, ranging from pM to µM. This aspect plays a key role in several biochemical sensing applications, where a wide working range is required.

Microring-resonator filter with doubled free-spectral-range by two-point coupling

2005 ◽  
Author(s):  
M.R. Watts ◽  
T. Barwicz ◽  
M. Popovic ◽  
P.T. Rakich ◽  
L. Socci ◽  
...  
Keyword(s):  
Spectral Range ◽  
Free Spectral Range ◽  
Microring Resonator

scholarly journals Infiltrated Photonic Crystal Fibers for Sensing Applications

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4263 ◽  
Author(s):  
José Algorri ◽  
Dimitrios Zografopoulos ◽  
Alberto Tapetado ◽  
David Poudereux ◽  
José Sánchez-Pena
Keyword(s):  
Photonic Crystal ◽  
Optical Fibers ◽  
Photonic Crystal Fibers ◽  
Scale Up ◽  
Dispersion Parameters ◽  
Power Pulse ◽  
Sensing Applications ◽  
Potential Applications ◽  
Crystal Fibers ◽  
Bose Einstein

Photonic crystal fibers (PCFs) are a special class of optical fibers with a periodic arrangement of microstructured holes located in the fiber’s cladding. Light confinement is achieved by means of either index-guiding, or the photonic bandgap effect in a low-index core. Ever since PCFs were first demonstrated in 1995, their special characteristics, such as potentially high birefringence, very small or high nonlinearity, low propagation losses, and controllable dispersion parameters, have rendered them unique for many applications, such as sensors, high-power pulse transmission, and biomedical studies. When the holes of PCFs are filled with solids, liquids or gases, unprecedented opportunities for applications emerge. These include, but are not limited in, supercontinuum generation, propulsion of atoms through a hollow fiber core, fiber-loaded Bose–Einstein condensates, as well as enhanced sensing and measurement devices. For this reason, infiltrated PCF have been the focus of intensive research in recent years. In this review, the fundamentals and fabrication of PCF infiltrated with different materials are discussed. In addition, potential applications of infiltrated PCF sensors are reviewed, identifying the challenges and limitations to scale up and commercialize this novel technology.

High-resolution measurement of the free spectral range of an etalon

2002 ◽  
Author(s):  
P. Douglas Knight ◽  
Alvaro Cruz-Cabrera ◽  
Brent C. Bergner
Keyword(s):  
High Resolution ◽  
Spectral Range ◽  
Free Spectral Range ◽  
High Resolution Measurement ◽  
Resolution Measurement
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