scholarly journals In-Fiber Mach-Zehnder Interferometer Based on Three-Core Fiber for Measurement of Directional Bending

Sensors ◽  
2019 ◽  
Vol 19 (1) ◽  
pp. 205 ◽  
Author(s):  
Lei Ding ◽  
Yu Li ◽  
Cai Zhou ◽  
Min Hu ◽  
Yuli Xiong ◽  
...  
Keyword(s):  
Single Mode ◽  
Zehnder Interferometer ◽  
Swept Source ◽  
The Core ◽  
Biomedical Sensing ◽  
Highly Sensitive ◽  
Potential Applications ◽  
Core Fiber ◽  
Bending Sensor ◽  
Mach Zehnder Interferometer

A highly sensitive directional bending sensor based on a three-core fiber (TCF) Mach-Zehnder interferometer (MZI) is presented in this study. This MZI-based bending sensor was fabricated by fusion-splicing a section of TCF between two single-mode fibers (SMF) with core-offset. Due to the location of the core in the TCF, a bend applied to the TCF-based MZI led to an elongation or shortening of the core, which makes the sensor suitable for directional bending measurement. To analyze the bending characteristics, two types of TCF-based sensors, with the fusion-spliced core located at different positions between the SMFs, were investigated. A swept source was employed in the measurement technique. The experimental results showed that, for the two types of sensors in this setup, the bending sensitivities of the two sensors were 15.36 nm/m−1 and 3.11 nm/m−1 at the bending direction of 0°, and −20.48 nm/m−1 and −5.29 nm/m−1 at the bending direction of 180°. The temperature sensitivities of the two sensors were 0.043 nm/°C and 0.041 nm/°C, respectively. The proposed sensors are compact, versatile, inexpensive to fabricate, and are expected to have potential applications in biomedical sensing.

A Novel In-Line Fiber Mach–Zehnder Interferometer Temperature Sensor Made of Thermally Expanded Core Fiber

2014 ◽  
Vol 635-637 ◽  
pp. 856-859 ◽  
Author(s):  
Ying Wu Zhou ◽  
Sheng Yu Chen
Keyword(s):  
Temperature Sensor ◽  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Core Mode ◽  
Temperature Changes ◽  
The Core ◽  
Core Fiber ◽  
Mach Zehnder Interferometer

A novel in-line fiber temperature sensor by splicing a piece of single mode fiber between two thermally expanded core fibers at their core-expanded ends is proposed and demonstrated. This structure forms an all fiber Mach–Zehnder interferometer due to the interference between the core mode and the cladding modes of the single mode fiber. The fabricated sensor is applied to measure temperature changes. The temperature sensitivity of the sensor at a length of 6.3cm is about 65.3 pm/°C. The proposed sensor is low cost, easily fabricated, and may be useful for detection of temperature.

scholarly journals Dual Demodulation of Temperature and Refractive Index Using Ring Core Fiber Based Mach-Zehnder Interferometer

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 258
Author(s):  
Weihao Yuan ◽  
Changyuan Yu
Keyword(s):  
Refractive Index ◽  
Extinction Ratio ◽  
Linear Equations ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Wavelength Shift ◽  
Core Fiber ◽  
Ring Core ◽  
Mach Zehnder Interferometer

We report the ring core fiber spliced with single mode fiber and no core fiber which is used for temperature and refractive index (RI) sensing. The Mach-Zehnder interferometer (MZI) is formed with this kind of sandwich fiber structure and the maximum extinction ratio of the interference spectra reaches 27 dB with the free spectra range of 12 nm. The MZI fiber sensor is applied for temperature sensing with the sensitivity of 69 pm/°C and 0.051 dB/°C. The RI sensitivity reaches 182.07 dB/RIU and −31.44 nm/RIU with the RI ranging from 1.33 to 1.38. The RI value can be directly demodulated with the interference dip intensity which shows insensitivity to temperature. The demodulation of temperature can be achieved by using the linear equations between dip wavelength shift with the variation of temperature and RI.

scholarly journals All-Optical Tunable Plasmonic Biosensor Made of Graphene and Metamaterial

2021 ◽  
Author(s):  
Fariba Lotfi ◽  
Nafiseh Sang-Nourpour ◽  
Reza Kheradmand
Keyword(s):  
Environmental Control ◽  
Silicon Layer ◽  
Zehnder Interferometer ◽  
Label Free ◽  
Biomedical Sensing ◽  
Highly Sensitive ◽  
Lossy Media ◽  
Path Structure ◽  
Cancerous Cells ◽  
Mach Zehnder Interferometer

Abstract We demonstrate a novel, label-free and real-time tunable infrared biosensor by employing surface-plasmon polaritons in asymmetric Mach-Zehnder interferometer. The waveguides cladding in the Mach-Zehnder interferometer is made of lossy media with positive and negative electromagnetic susceptibilities, including metamaterial, metal and graphene. The core consists of dielectric media. We introduce two configurations for our biosensor structure. First configuration is an open-path structure and the second one consists of a sample housing made of a silicon layer around the structure. We also present a tunable biosensor by applying a gate voltage to the graphene in the structure. We employ three different cancerous cells, including cervical, breast and basal, as samples to examine the capabilities of the biosensor. Our biosensor structure is highly sensitive, compared to the existing biosensors in the literature, with the sensitivity for basal cancer cell of 1034THz/RIU. The proposed biosensor structure is compact and easy to fabricate with applications in biomedical sensing and environmental control to detect water pollutants.

scholarly journals Improving the Sensitivity of Humidity Sensor Based on Mach-Zehnder Interferometer Coated with a Methylcellulose

2018 ◽  
Vol 2018 ◽  
pp. 1-5 ◽  
Author(s):  
Jun Huang ◽  
Bowen Wang ◽  
Kai Ni
Keyword(s):  
Refractive Index ◽  
Humidity Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Core Mode ◽  
The Core ◽  
Intensity Changes ◽  
Practical Measurement ◽  
Mach Zehnder Interferometer

A novel humidity sensor based on Mach-Zehnder interferometer (MZI) with the single-mode fiber (SMF) coated with methylcellulose (MC) is proposed and experimentally demonstrated. The MZI consists of two waist enlarged structures. Such an all-fiber MZI incorporates an intermodal interference between the core mode and cladding modes. The MC is coated on the surface of the SMF. External humidity changes the refractive index of MC, causing the intensity changes of the interference pattern. The proposed sensor is linearly responsive to refractive humidity (RH) within the range from 45% to 85% RH, with sensitivity of 0.094 dB/%RH. Moreover the insensitivity of the fiber to the temperature makes this structure more suitable for practical measurement.

scholarly journals Highly-sensitive gas pressure sensor using twin-core fiber based in-line Mach-Zehnder interferometer

2015 ◽  
Vol 23 (5) ◽  
pp. 6673 ◽  
Author(s):  
Zhengyong Li ◽  
Changrui Liao ◽  
Yiping Wang ◽  
Lei Xu ◽  
Dongning Wang ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Gas Pressure ◽  
Zehnder Interferometer ◽  
Highly Sensitive ◽  
Core Fiber ◽  
Mach Zehnder Interferometer

scholarly journals Tapered Fiber-Optic Mach-Zehnder Interferometer for Ultra-High Sensitivity Measurement of Refractive Index

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1652 ◽  
Author(s):  
Vahid Ahsani ◽  
Farid Ahmed ◽  
Martin Jun ◽  
Colin Bradley
Keyword(s):  
Refractive Index ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Sensitivity Measurement ◽  
Biochemical Sensing ◽  
Highly Sensitive ◽  
Mach Zehnder Interferometer

A Mach-Zehnder interferometer (MZI) based fiberoptic refractive index (RI) sensor is constructed by uniformly tapering standard single mode fiber (SMF) for RI measurement. A custom flame-based tapering machine is used to fabricate microfiber MZI sensors directly from SMFs. The fabricated MZI device does not require any splicing of fibers and shows excellent RI sensitivity. The sensor with a cladding diameter of 35.5 µm and length of 20 mm exhibits RI sensitivity of 415 nm/RIU for RI range of 1.332 to 1.384, 1103 nm/RIU for RI range of 1.384 to 1.4204 and 4234 nm/RIU for RI range of 1.4204 to 1.4408, respectively. The sensor reveals a temperature sensitivity of 0.0097 nm/°C, which is relatively low in comparison to its ultra-high RI sensitivity. The proposed inexpensive and highly sensitive optical fiber RI sensors have numerous applications in chemical and biochemical sensing fields.

Sign in / Sign up

Export Citation Format

Share Document