The feasibility of polarization-maintaining photonic crystal fibre (PM-PCF) strategy for acoustooptic modulation using all-fibre\nSagnac interferometer is demonstrated. The principal constraint to apply the strategy is defined by a linear laser acoustooptic\nmodulator (AOM) for 1550 nm. The intensity of incident acoustic waves over the PM-PCF loop segment affected the signal\ninterference transmission; here, modulation by birefringence variation around 7.6 Ã?â?? 10âË?â??4 Ã?± Ã?â?ni\nwas observed. It is discovered\nthat, through mathematical analysis, two operation points in the spectrum, T\nSI\n(Ã?»), operate in a linear region, and expressions for\nspectral gain and sensibility are also discovered. AOM has a bandwidth from 0.1 Hz to 20 kHz, and its dynamic range is from 0.0\nto 43.5 dB.
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