Method to sensitize an arc‐induced LPFG‐based sensor using double‐pass configuration

Abstract

The sensitivity of the arc‐induced long period fiber grating (LPFG) sensor was improved utilizing the double‐pass configuration. The sensitivity in terms of transmission attenuation of the resonance wavelength for the double‐pass LPFG configuration was better compared to the single‐pass configuration when it was used to monitor the avidin–biotin interaction over a period of 60 min. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2766–2769, 2014

Sensitization of hybrid LPFG–FBG refractometer using double-pass configuration

“…index between 1.43 and 1.46. The enhancement of the reflected power sensitivity of the double-pass hybrid LPFG-FBG system is mainly due the longer path in which the light passes through the LPFG grating region thus allowing better coupling between the core and cladding modes [19]. This is different from the case of LPFG with very long grating length where re-coupling of power from the cladding to the core modes will occur that a b Fig.…”

“…We are proposing the use of double-pass configuration to increase the notch depth of the arc-induced LPFG resonant wavelength thus enhancing the sensitivity of the hybrid LPFG-FBG system. The longer path in which the light passes through the LPFG grating region allows better coupling between the core and cladding modes, thus giving better transmission power sensitivity [19]. To date, no previous work has been reported on the use of double-pass configuration, as proposed in this work, to enhance the sensitivity of a hybrid LPFG-FBG sensor.…”