Dispersion Compensating Ring Fibre in the C-Band for OAM Mode

Orbital angular momentum (OAM) modes have gained a lot of interest as being a potential technology to further improve the speed of data transmission in the fibre-based optical communication systems. As a complete set of orthogonal basis functions for spatial distribution of electromagnetic field, the number of OAM modes can be theoretically limitless. Consequently, OAM beams can be implemented for building optical communication channels to feature better spectral efficiency and higher data-carrying capacity [1] , [2] . In our previous work, we have proposed and designed a non-zero dispersion-shifted ring fibres (NZDSRF) for the transmission of OAM mode [3] . A positive dispersion of 3.3 ps/(nm·km) has been obtained at wavelength of 1550 nm for OAM 1,1 mode, with a dispersion slope of 0.0829 ps/(nm 2 ·km) from 1530 to 1565 nm. In order to build an effective optical fibre transmission link using the wavelength division multiplexing (WDM) technology, a laudable goal would be to have the corresponding dispersion compensating fibre for OAM mode in the C-band.