Dispersion properties of a photonic quasi-crystal fiber with double cladding air holes

Robust transmission of orbital angular momentum mode based on a dual-cladding photonic quasi-crystal fiber

“…In this paper, a silica-based dual-cladding photonic quasicrystal fiber (DC-PQF) is used to achieve a high order of 10 −2 of Δn eff for all supported mode groups in a wavelength band of >200 nm, highly supporting robust transmission of OAM modes. Photonic quasi-crystal [20] with quasi-periodic structure has been widely applied in lenses [21][22][23][24][25][26], lasers [27], prisms [28], filters [29] and fibers [30][31][32][33][34][35][36][37][38][39], etc. The employed DC-PQF possesses unique lattice arrangement characterizing with rotational symmetry rather than translational symmetry of PCF, which enables a perfect match with the annular phase shape of OAM mode.…”

“…The employed DC-PQF possesses unique lattice arrangement characterizing with rotational symmetry rather than translational symmetry of PCF, which enables a perfect match with the annular phase shape of OAM mode. Moreover, its high optical property-tailored ability, particularly for near-zero flattened dispersion [30,[36][37], can benefit the dispersion optimization. Numerical results reveal that the achieved maximum dispersion variation and confinement loss for TE 01 mode are less than 19.736 ps/ nm/km and 10 −2 dB m −1 within a 400 nm bandwidth from 1.35 to 1.75 μm, respectively.…”

U-shaped photonic quasi-crystal fiber sensor with high sensitivity based on surface plasmon resonance

“…[8][9][10] In practice, it is very cumbersome and complicated to cover the metal to the air hole inside the fiber, which makes the fabrication of the internal fiber sensor very difficult. At the same time, photonic quasi-crystal fiber (PQF) with rotational symmetry has been widely studied [19][20][21][22][23][24] and has been used in the sensing field. [25][26][27][28] PQF has high sensitivity due to its excellent properties, such as low porosity and low loss.…”

Directional Coupler Based on a Photonic Quasi-Crystal Fiber with Extended Cores

“…In fact, removing the air holes does not affect the symmetry of repetitions along the length of the fiber, since these defects are located at equidistant and symmetrical points in relation to the horizontal line center of the PQCF transversal section. Another point remains in the fact that the photonic quasi-crystals can have their symmetry and geometry predefined, which allowed the development of this design [9]. It is important to emphasize that the crystalline structure was obtained by intercalating air holes, which were immersed in pure silica with a corresponding wavelength of 1.55 µm.…”