Tapered Splicing Points SMF-PCF-SMF Structure based on Mach-Zehnder interferometer for Enhanced Refractive Index Sensing

Ali. Salman, Nawras; J. Taher, Hanan; A. Mohammed, Saif

	Tapered Splicing Points SMF-PCF-SMF Structure based on Mach-Zehnder interferometer for Enhanced Refractive Index Sensing
Iraqi Journal of Laser
Article 1, Volume 16, Issue 0, 2017, Pages 19-24
Authors
Nawras Ali. Salman; Hanan J. Taher; Saif A. Mohammed
Abstract
Abstract: Photonic crystal fiber interferometers (PCFIs) are widely used for sensing applications. This work presented solid core-PCFs based on Mach-Zehnder modal interferometer for sensing refractive index. The general structure of sensor was applied by splicing short lengths of PCF in both sides with conventional single mode fiber (SMF-28).To apply modal interferometer theory collapsing technique based on fusion splicing used to excite higher order modes (LP01 and LP11). A high sensitive optical spectrum analyzer (OSA) was used to monitor and record the transmitted wavelength. This work studied a Mach-Zahnder interferometer refractive index sensor based on splicing point tapered SMF-PCF-SMF. Relation between refractive index sensitivity and taper waist diameter were studied through simulation and experiments. The experimental and simulation results show that sensitivity would be increased with a decrease of taper waist diameter. The response of the PCFI is observed for a range of refractive index values from (1.33 to 1.38). When the length of PCF was (4)cm with different taper waist diameter (125,107,90,60)µm, the maximum refractive index sensitivity of (20 pm / RIU) was achieved. When taper waist diameter became (60)µm, the rate of increase in sensitivity was 12.4% compared with the taper waist diameter (125)µm.
Keywords
Mach; Zehnder interferometer; High sensitivity; wavelength; Shift; Splicing points tapering; photonic crystal fiber

Statistics Article View: 222 PDF Download: 133