A PANDA polarization-maintaining few-mode ring-core fiber (PM-FM-RCF) structure with two air holes around the ring core is proposed. The relative mode multiplicity factor (RMMF) is defined to evaluate the spatial efficiency of the designed PM-FM-RCF. The performance analysis and comparison of the proposed PANDA PM-FM-RCFs considering three different types of step-index profiles are detailed. Through modal characteristic analysis and numerical simulation, the PM-FM-RCF with a lower refractive index difference (Δnoi=1.5%) between the ring core and the inner central circle can support up to 16 polarization modes with large RMMF at C-band, which shows the optimum modal properties compared with the PM-FM-RCF with higher Δnoi. All the supported polarization modes are effectively separated from their adjacent polarization modes with effective refractive index differences (Δneff) larger than 10−4, which also show relatively small chromatic dispersion (−20 to 25 ps/nm/km), low attenuation (<1.4 dB/km), and small bending radius (∼8 mm) over the C-band. The designed PM-FM-RCF can be compatible with standard single-mode fibers and applied in multiple-input multiple-output-free spatial division multiplexing optical networks for short-reach optical interconnection.
In this work, the slow light modes of the polyatomic photonic crystal (PhC) which has multiple different holes in the
smallest unit cell are investigated. The slow light waveguide with nearly constant group index over large bandwidth is
achieved using this new photonic crystal geometry based on square lattice. The feasibility of controlling the dispersion
relation through subtle structural modification is also investigated.
Design optimization of a pure silica dual-core photonic crystal fiber for broadband dispersion compensation is proposed
to match the relative dispersion slope of the standard single-mode fiber. The influence of the three diameters of the
air-holes in the outer cladding upon the dispersive and slope-matched property is investigated and a dispersion value of
-3179.9 ps • ;nm&--1 • km--1 at 1550 nm has been predicted. The dispersion of the standard single-mode fiber, which is
187 times the length of the dual-core photonic crystal fiber, can be compensated (to within 0.12%) over the entire C band
/ (to within 0.56%) over the 100-nm broadband centered at 1550nm .
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