Abstract
We demonstrate and analyze the acousto-optic coupling between two optical polarization modes of the LP(01) mode propagating in a highly birefringent photonic crystal fiber. The coupling is realized based on wavelength selective acousto-optic coupling by traveling torsional acoustic wave in an all-fiber tunable polarization filter configuration. The dispersion properties of the torsional acoustic wave in the photonic crystal fiber and the influence of axial non-uniformity in the modal birefringence on the filter transmission are discussed in detail.
Highlights
Photonic devices using the photonic crystal fibers (PCFs) have attracted increasing attention because of their unique optical properties and design flexibility that cannot be achieved in conventional optical fibers, such as a wide range of single-mode operation, dispersion tailoring, reduced or enhanced effective nonlinearity, bandgap guidance, and attainable high birefringence [1, 2]
AO coupling properties in several types of PCFs have been investigated in a single mode PCF [6], a weakly multimode solid core PCF [7], a birefringent two-mode PCF [8], and a fluid-filled solid-core photonic bandgap fiber (PBGF) [9]
We reported a practical all-fiber acousto-optic tunable polarization filter (AOTPF) based on the polarization mode coupling in LP01 mode in a conventional highly birefringent (HB) optical fiber using traveling torsional acoustic wave [12]
Summary
Photonic devices using the photonic crystal fibers (PCFs) have attracted increasing attention because of their unique optical properties and design flexibility that cannot be achieved in conventional optical fibers, such as a wide range of single-mode operation, dispersion tailoring, reduced or enhanced effective nonlinearity, bandgap guidance, and attainable high birefringence [1, 2]. This opens up diverse potential applications including high power delivery, optical amplification, optical sensing, and low non-linear data transmission in optical communication, metrology, medicine, and beyond [3,4,5]. The transmission properties of the fabricated filter and the dispersion properties of the lowest order torsional acoustic mode in the PCF are discussed in detail
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