All-fiber intermodal Mach–Zehnder interferometer based on a long-period fiber grating combined with a fiber bitaper

2012 ◽  
Vol 285 (19) ◽  
pp. 3935-3938 ◽  
Author(s):  
Xiaolin Xue ◽  
Weigang Zhang ◽  
Limei Yin ◽  
Shilei Wei ◽  
Shecheng Gao ◽  
...  
Keyword(s):  
Zehnder Interferometer ◽  
Fiber Grating ◽  
Long Period Fiber Grating ◽  
Long Period ◽  
Period Fiber Grating ◽  
Mach Zehnder Interferometer

scholarly journals Combined Long-Period Fiber Grating and Microcavity In-Line Mach–Zehnder Interferometer for Refractive Index Measurements with Limited Cross-Sensitivity

Sensors ◽  
2020 ◽  
Vol 20 (8) ◽  
pp. 2431 ◽  
Author(s):  
Monika Janik ◽  
Marcin Koba ◽  
Krystian Król ◽  
Predrag Mikulic ◽  
Wojtek J. Bock ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Efficiency ◽  
Single Mode ◽  
Zehnder Interferometer ◽  
Fiber Grating ◽  
Long Period Grating ◽  
Cross Sensitivity ◽  
Long Period ◽  
Period Fiber Grating ◽  
Mach Zehnder Interferometer

This work discusses sensing properties of a long-period grating (LPG) and microcavity in-line Mach–Zehnder interferometer (µIMZI) when both are induced in the same single-mode optical fiber. LPGs were either etched or nanocoated with aluminum oxide (Al2O3) to increase its refractive index (RI) sensitivity up to ≈2000 and 9000 nm/RIU, respectively. The µIMZI was machined using a femtosecond laser as a cylindrical cavity (d = 60 μm) in the center of the LPG. In transmission measurements for various RI in the cavity and around the LPG we observed two effects coming from the two independently working sensors. This dual operation had no significant impact on either of the devices in terms of their functional properties, especially in a lower RI range. Moreover, due to the properties of combined sensors two major effects can be distinguished—sensitivity to the RI of the volume and sensitivity to the RI at the surface. Considering also the negligible temperature sensitivity of the µIMZI, it makes the combination of LPG and µIMZI sensors a promising approach to limit cross-sensitivity or tackle simultaneous measurements of multiple effects with high efficiency and reliability.

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