Acoustic birefringence suppression in a fiber acoustic grating employing solid-core photonic crystal fiber with hexagonal air-hole array cladding

Abstract

An acoustic birefringence suppression scheme for acoustic fiber gratings has been proposed and experimentally demonstrated. Experimental observation of the transmission characteristics of the single-mode-fiber-based (SMF-based) acoustic grating confirms that introduction of one segment of solid-core photonic crystal fiber (PCF) with air-hole array in the cladding region helps to eradicate resonance peak splitting induced by acoustic birefringence, which has been explained by our theoretical analysis from the acoustic wave modulation method and fiber cross-section structure. Moreover, experimental results indicate that the introduction of the solid-core PCF does not have a considerable impact on the frequency dependence of resonance wavelength for the SMF-based acoustic fiber grating, which ensures the performances of the PCF-assisted SMF-based acousto-optic tunable filter for practical applications.

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“…Due to significant variations in Young's modulus because of the air columns running along the fiber length of HC-PBF or PCFs, these systems prove to be good sensors for axial strain applied acoustic pressure parameter sensing. Recently, little effort has been put into developing the PCF-based acousto-optic devices including hollow-core PCF [16][17][18], solidcore PCF [19,20], dual-core PCF [21], twin-core PCF [22], and highly birefringent PCFs [23,24]. Pang and Jin [17] have demonstrated a Michelson interferometerbased system using a 5.7 m fiber to sense the frequencies in a wide range (40-3000 Hz) at 1550 nm, with phase shift as the function of pressure.…”