UV exposure on a single-mode fiber within a multimode interference structure

2014 ◽  
Vol 39 (22) ◽  
pp. 6521 ◽  
Author(s):  
Qiang Wu ◽  
Jinhui Yuan ◽  
Chongxiu Yu ◽  
Xinzhu Sang ◽  
Lipeng Sun ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Uv Exposure ◽  
Multimode Interference ◽  
Interference Structure

scholarly journals Multimode interference in tapered single mode-multimode-single mode fiber structures for strain sensing applications

2012 ◽  
Author(s):  
Ricardo M. André ◽  
Claudecir R. Biazoli ◽  
Susana O. Silva ◽  
Manuel B. Marques ◽  
Cristiano M. B. Cordeiro ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Multimode Interference ◽  
Strain Sensing ◽  
Sensing Applications

Long-Period Gratings and Multimode Interference in Helical Single-Mode Fiber

2019 ◽  
Vol 31 (24) ◽  
pp. 1956-1959
Author(s):  
Boyao Li ◽  
Ran Xia ◽  
Perry Ping Shum ◽  
Guiyao Zhou
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Multimode Interference ◽  
Long Period ◽  
Long Period Gratings

scholarly journals Fiber Vector Bend Sensor Based on Multimode Interference and Image Tapping

Sensors ◽  
2019 ◽  
Vol 19 (2) ◽  
pp. 321
Author(s):  
Ziyang Zhang ◽  
Aashia Rahman ◽  
Julia Fiebrandt ◽  
Yu Wang ◽  
Kai Sun ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Bend Angle ◽  
Multimode Interference ◽  
Multimode Fiber ◽  
Bend Radius ◽  
Light Intensity Distribution ◽  
Imaging Processing ◽  
Core Fiber ◽  
Bend Sensor

A grating-less fiber vector bend sensor is demonstrated using a standard single mode fiber spliced to a multimode fiber as a multimode interference device. The ring-shaped light intensity distribution at the end of the multimode fiber is subject to a vector transition in response to the fiber bend. Instead of comprehensive imaging processing for the analysis, the image can be tapped out by a seven-core fiber spliced to the other end of the multimode fiber. The seven-core fiber is further guided to seven single mode fibers via a commercial fan-out device. By comparing the relative light intensities received at the seven outputs, both the bend radius and its direction can be determined. Experiment has shown that a slight bend displacement of 10 µm over a 1.2-cm-long multimode fiber in the X direction (bend angle of 0.382°) causes a distinctive power imbalance of 4.6 dB between two chosen outputs (numbered C4 and C7). For the same displacement in the Y direction, the power ratio between the previous two outputs C4 and C7 remains constant, while the imbalance between another pair (C3 and C4) rises significantly to 7.0 dB.

scholarly journals Optimized Multimode Interference Fiber Based Refractometer in A Reflective Interrogation Scheme

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1107
Author(s):  
Renato Bellini ◽  
Carolina V. S. Borges ◽  
Bruno Rente ◽  
Maria A. G. Martinez
Keyword(s):  
Fiber Length ◽  
Gold Film ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Refractive Indices ◽  
Multimode Interference ◽  
Multimode Waveguide ◽  
Thin Gold Film ◽  
Broadband Light Source ◽  
Sensitivity Increase

A fiber based refractometer in a reflective interrogation scheme is investigated and optimized. A thin gold film was deposited on the tip of a coreless fiber section, which is spliced with a single mode fiber. The coreless fiber is a multimode waveguide, and the observed effects are due to multimode interference. To investigate and optimize the structure, the multimode part of the sensor is built with 3 different lengths: 58 mm, 29 mm and 17 mm. We use a broadband light source ranging from 1475 nm to 1650 nm and we test the sensors with liquids of varying refractive indices, from 1.333 to 1.438. Our results show that for a fixed wavelength, the sensor sensitivity is independent of the multimode fiber length, but we observed a sensitivity increase of approximately 0.7 nm/RIU for a one-nanometer increase in wavelength.

scholarly journals High Sensitivity Refractometer Based on a Tapered-Single Mode-No Core-Single Mode Fiber Structure

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1722 ◽  
Author(s):  
Yang ◽  
Zhang ◽  
Geng ◽  
Li ◽  
Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Contrast Ratio ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Experimental Investigations ◽  
Multimode Interference ◽  
Fiber Structure ◽  
Index Unit ◽  
Good Agreement

We have proposed a novel tapered-single mode-no core-single mode (TSNS) fiber refractometer based on multimode interference. The TSNS structure exhibits a high contrast ratio (＞15 dB) and a uniform interference fringe. The influence of different lengths and diameters of the TSNS on the refractive index unit (RIU) sensitivity was investigated. The experimental investigations indicated a maximum sensitivity of 1517.28 nm/RIU for a refractive index of 1.417 and low-temperature sensitivity (＜10 pm/ºC). The experimental and simulation results are also in good agreement.

scholarly journals Relative Humidity Fiber Sensor Based on Multimode Interferometer Coated with Agarose-Gel

Coatings ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 453 ◽  
Author(s):  
Susana Novais ◽  
Marta Ferreira ◽  
João Pinto
Keyword(s):  
Relative Humidity ◽  
Single Mode ◽  
Dip Coating ◽  
Single Mode Fiber ◽  
Fiber Sensor ◽  
Wavelength Shift ◽  
Multimode Interference ◽  
Agarose Gel ◽  
System A ◽  
Dip Coating Technique

In this work, a relative humidity (RH) sensor based on a structure with multimode interference is proposed and experimentally demonstrated. The multimode sensor is fabricated by fusion splicing a coreless fiber section to a single mode fiber. A hydrophilic agarose gel is coated on the coreless fiber, using the dip coating technique. By changing the surrounding RH, the refractive index of the coated agarose gel will change, causing a wavelength shift of the peak in the reflection spectra. For RH variations in the range between 60.0%RH and 98.5%RH, the sensor presents a maximum sensitivity of 44.2 pm/%RH, and taking in consideration the interrogation system, a resolution of 0.5%RH is acquired. This sensor has a great potential in real time RH monitoring and can be of interest for applications where a control of high levels of relative humidity is required.

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