Abstract
We present a weakly-coupled air-hole-bow-tie-assisted few-mode fiber (AH-BT-FMF) supporting 26 eigenmodes for short-haul communication systems across the C + L band. The elliptical core, air holes, and bow-tie stress-applying area are introduced to effectively split adjacent eigenmodes. We evaluate the impact of fiber parameters on minimum effective refractive index difference (min Δneff) between adjacent modes, birefringence (B), and bending loss at a wavelength of 1550 nm. The broadband performance of the fiber is further investigated across the C + L band, including the effective refractive index difference (Δneff) between adjacent modes, differential mode delay (DMD), dispersion, and effective area (Aeff). Simulated results indicate that the 26 eigenmodes supported by the designed fiber are completely separated. The min Δneff between adjacent modes is larger than 1.982 × 10−4 over the whole C + L band. And the designed fiber has a higher effective area (66.56 –131.1 µm2), lower DMD (− 8.07 to 10.96 ns/km), and good bending resistance (< 10–4 dB/m). The designed fiber can be used for short-haul multiple-input multiple-output-free eigenmode-division multiplexing systems to improve transmission capacity and expand bandwidth.
Availability of data and materials
The datasets generated during the current study are available from the corresponding author on reasonable request.
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This work is supported by the Fundamental Research Funds for the Central Universities (FRF-TP-19-016A2).
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FR: Conceptualization, Methodology. YC: Investigation, Software, Writing—original. XL: Review, Editing. YZ: Data Curation. XW: Data Curation. JW: Supervision. All authors reviewed the manuscript.
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Ci, Y., Ren, F., Lei, X. et al. A weakly-coupled air-hole-bow-tie-assisted few-mode fiber for short-haul MDM across C + L band. Opt Quant Electron 55, 924 (2023). https://doi.org/10.1007/s11082-023-05176-y
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DOI: https://doi.org/10.1007/s11082-023-05176-y