Analysis of Design and Fabrication Parameters for Lensed Optical Fibers as Pertinent Probes for Sensing and Imaging

Soongho Park; Sunghwan Rim; Ju Kim; Jinho Park; Ik-Bu Sohn; Byeong Lee

doi:10.3390/s18124150

Analysis of Design and Fabrication Parameters for Lensed Optical Fibers as Pertinent Probes for Sensing and Imaging

Sensors ◽

10.3390/s18124150 ◽

2018 ◽

Vol 18 (12) ◽

pp. 4150 ◽

Cited By ~ 1

Author(s):

Soongho Park ◽

Sunghwan Rim ◽

Ju Kim ◽

Jinho Park ◽

Ik-Bu Sohn ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Single Mode ◽

Spot Size ◽

Single Mode Fiber ◽

Fiber Probe ◽

Optical Fiber Probe ◽

Working Distance ◽

Physical Sensing ◽

Fabrication Parameters

A method for adjusting the working distance and spot size of a fiber probe while suppressing or enhancing the back-coupling to the lead-in fiber is presented. As the optical fiber probe, a lensed optical fiber (LOF) was made by splicing a short piece of coreless silica fiber (CSF) on a single-mode fiber and forming a lens at the end of the CSF. By controlling the length of the CSF and the radius of lens curvature, the optical properties of the LOF were adjusted. The evolution of the beam in the LOF was analyzed by using the Gaussian ABCD matrix method. To confirm the idea experimentally, 17 LOF samples were fabricated and analyzed theoretically and also experimentally. The results show that it is feasible in designing the LOF to be more suitable for specific or dedicated applications. Applications in physical sensing and biomedical imaging fields are expected.

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Microdrilled tapers to enhance optical fiber lasers for sensing

Scientific Reports ◽

10.1038/s41598-021-00046-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

R. A. Perez-Herrera ◽

M. Bravo ◽

P. Roldan-Varona ◽

D. Leandro ◽

L. Rodriguez-Cobo ◽

...

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Fiber Lasers ◽

Signal To Noise Ratio ◽

Power Level ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Output Power Level ◽

Linear Cavity

AbstractIn this work, an experimental analysis of the performance of different types of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror is presented. These artificially-controlled backscattering fiber reflectors are used in short linear cavity fiber lasers. In particular, laser emission and sensor application features are analyzed when employing optical tapered fibers, micro-drilled optical fibers and 50 μm-waist or 100 μm-waist micro-drilled tapered fibers (MDTF). Single-wavelength laser with an output power level of about 8.2 dBm and an optical signal-to-noise ratio of 45 dB were measured when employing a 50 μm-waist micro-drilled tapered optical fiber. The achieved temperature sensitivities were similar to those of FBGs; however, the strain sensitivity improved more than one order of magnitude in comparison with FBG sensors, attaining slope sensitivities as good as 18.1 pm/με when using a 50 μm-waist MDTF as distributed reflector.

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Photonic Jet-Shaped Optical Fiber Tips versus Lensed Fibers

Photonics ◽

10.3390/photonics8090373 ◽

2021 ◽

Vol 8 (9) ◽

pp. 373

Author(s):

Djamila Bouaziz ◽

Grégoire Chabrol ◽

Assia Guessoum ◽

Nacer-Eddine Demagh ◽

Sylvain Lecler

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Single Mode ◽

Spot Size ◽

Base Diameter ◽

Core Diameter ◽

Focus Spot ◽

Photonic Jet ◽

Focus Spot Size ◽

Focusing Properties

Shaped optical fiber tips have recently attracted a lot of interest for photonic jet light focusing due to their easy manipulation to scan a sample. However, lensed optical fibers are not new. This study analyzes how fiber tip parameters can be used to control focusing properties. Our study shows that the configurations to generate a photonic jet (PJ) can clearly be distinguished from more classical-lensed fibers focusing. PJ is a highly concentrated, propagative light beam, with a full width at half maximum (FWHM) that can be lower than the diffraction limit. According to the simulations, the PJs are obtained when light is coupled in the guide fundamental mode and when the base diameter of the microlens is close to the core diameter. For single mode fibers or fibers with a low number of modes, long tips with a relatively sharp shape achieve PJ with smaller widths. On the contrary, when the base diameter of the microlens is larger than the fiber core, the focus point tends to move away from the external surface of the fiber and has a larger width. In other words, the optical system (fiber/microlens) behaves in this case like a classical-lensed fiber with a larger focus spot size. The results of this study can be used as guidelines for the tailored fabrication of shaped optical fiber tips according to the targeted application.

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Research on a Novel Fabry–Perot Interferometer Model Based on the Ultra-Small Gradient-Index Fiber Probe

Sensors ◽

10.3390/s19071538 ◽

2019 ◽

Vol 19 (7) ◽

pp. 1538 ◽

Cited By ~ 1

Author(s):

Chi Wang ◽

Jianmei Sun ◽

Chenye Yang ◽

Bin Kuang ◽

Dong Fang ◽

...

Keyword(s):

Output Voltage ◽

Experimental System ◽

Single Mode ◽

Single Mode Fiber ◽

Gradient Index ◽

The Novel ◽

Fiber Probe ◽

Model Based ◽

Fabry Perot ◽

Working Distance

A novel Fabry–Perot (F–P) interferometer model based on the ultra-small gradient-index (GRIN) fiber probe is investigated. The signal arm of the F–P interferometer is organically combined with the ultra-small GRIN fiber probe to establish the theoretical model of the novel F–P interferometer. An interferometer experimental system for vibration measurements was built to measure the performance of the novel F–P interferometer system. The experimental results show that under the given conditions, the output voltage of the novel interferometer is 3.9 V at the working distance of 0.506 mm, which is significantly higher than the output voltage 0.48 V of the single-mode fiber (SMF) F–P interferometer at this position. In the range of 0.1–2 mm cavity length, the novel interferometer has a higher output voltage than an SMF F–P interferometer. Therefore, the novel F–P interferometer is available for further study of the precise measurement of micro vibrations and displacements in narrow spaces.

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Materials Effects on the Radiation Sensitivity of Single Mode Optical Fibers

MRS Proceedings ◽

10.1557/proc-172-103 ◽

1989 ◽

Vol 172 ◽

Cited By ~ 1

Author(s):

E. J. Friebele ◽

C. G. Askins ◽

M. E. Gingerich ◽

C. M. Shaw ◽

W. H. Schmidt

Keyword(s):

Radiation Dose ◽

Ionizing Radiation ◽

Optical Fibers ◽

Single Mode ◽

Radiation Sensitivity ◽

Single Mode Fiber ◽

Fiber Waveguides ◽

Fabrication Parameters

AbstractStatistically significant correlations have been established between certain fabrication parameters of matched clad single mode fiber waveguides and the induced attenuation and recovery kinetics following exposure to an ionizing radiation dose.

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Study of Microbending Loss Single Mode Optic Fiber in Sand Powder Against Pressure

Journal of Technomaterials Physics ◽

10.32734/jotp.v3i1.5549 ◽

2021 ◽

Vol 3 (1) ◽

pp. 65-73

Author(s):

Bambang Widiyatmoko ◽

Mefina Y. Rofianingrum

Keyword(s):

Optical Fiber ◽

Optical Fibers ◽

Voltage Drop ◽

Signal Transmission ◽

Single Mode ◽

Optical Signal ◽

Single Mode Fiber ◽

Mechanical Pressure ◽

Optical Attenuation ◽

Load Sensor

Research has been carried out to further investigate specifically the effect of sand powder, both the size of the sand grains and the thickness of the sand powder on the photodetector output as an advanced study of the single-mode optical fiber microbending loss theory in sand grains to pressure. This was done to investigate the response of optical fibers due to microbending loss to the load and determine the size of the sand particles that are most effectively used as a compiler of load sensors. The principle works to test the response of load sensors based on single-mode fiber optic microbending loss in the form of photodetector output when given a large variety of pressure. The method used in this research is to observe the reduction in the intensity of the light transmitted through optical fibers in the form of a voltage drop that is read by MMD that is connected to the photodetector. The reduced light intensity shows that the load sensor experiences optical attenuation of the laser as a light source with a wavelength of 1550 nm and a power of 1.47 mW. Microbending loss is caused by mechanical pressure that can change the direction of optical signal transmission and the radius of the curve is equal to or less than the diameter of a bare optical fiber. Observations were made using 12 load sensors with variations in the size of the sand grains in each diameter of the hose. The results of this study obtained the size of the most effective grains of sand providing microscopic curvature in the optical fiber that is 0.05 mm in terms of the correlation between the response of sensors with various diameters to changes in pressure.

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Dynamic speckle spatial coherence measurements utilizing a single-mode optical-fiber probe

Journal of the Optical Society of America A ◽

10.1364/josaa.8.001306 ◽

1991 ◽

Vol 8 (8) ◽

pp. 1306 ◽

Cited By ~ 2

Author(s):

M. D. Mermelstein ◽

R. G. Priest

Keyword(s):

Optical Fiber ◽

Spatial Coherence ◽

Single Mode ◽

Fiber Probe ◽

Single Mode Optical Fiber ◽

Optical Fiber Probe ◽

Dynamic Speckle

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Development of a Fabrication Process for the Manufacturing of a Microspherical Probe for Coordinate Measuring Machine Applications

Journal of Mechanical Design ◽

10.1115/1.4005084 ◽

2011 ◽

Vol 133 (11) ◽

Cited By ~ 2

Author(s):

H. Ji ◽

J. Chua ◽

H.-Y. Hsu ◽

A. B. Wedding

Keyword(s):

Optical Fiber ◽

Coordinate Measuring Machine ◽

Single Mode ◽

Fiber Probe ◽

Optical Fiber Probe ◽

Measuring Machine ◽

Silica Optical Fiber ◽

Controllable Fabrication ◽

Structure Measurement ◽

Prototype Apparatus

In recent years, downscaled coordinate measuring machines (CMMs) are in demand and bring challenges to the development of micro/nanoscale probes for a variety of microscale structure measurement applications. A working prototype apparatus is developed in which a microspherical optical fiber probe tip is created from a strand of standard single mode silica optical fiber using an electric discharge technique. The Taguchi method has been used to investigate the general effects of probe fabrication conditions that result in controllable fabrication of a quality probe tip. With proper control of the process parameters, spherical optical fiber probe tips with the desired diameters in the range of 133–360 μm with a diameter variance within 3% and minimum spherical tip center offset of about 2.2 μm have been achieved. An economical and flexible technique for the fabrication of a quality microspherical probe for micro/nano-CMM application is developed in this work.

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