Abstract
It is well-known now that orbital angular momentum (OAM) modes can be a potential technology to take full advantages of the space resources in the fiber-based optical communication system because of its infinite states. However, the corresponding fiber design for OAM modes to meet various requirements in the fiber-based communication system is still not enough. For the dispersion property, there are various attributes given in the standard of ITU-T series, which has not yet been proposed for the OAM modes. In this paper, we propose and design a non-zero dispersion-shifted air-core ring fiber for OAM mode, which can offer more options on dispersion values. A negative dispersion of -1.246 ps/(nm·km) or a positive dispersion of 1.541 ps/(nm ·km) at 1550 nm with <; 1.5 ps/(nm ·km) dispersion variation across the C band or <; 4 ps/(nm ·km) dispersion variation across the C and L bands for OAM <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1,1</sub> mode is achieved in the numerical simulation.
Highlights
Nowadays, helically phased light carrying orbital angular momentum (OAM) has been well known, as exciting progress on the application of OAM modes has been made in various fields [1,2,3,4]
Chromatic dispersion is one of the key parameters to impact the quality of the transmitted optical signal over wide bandwidth, and it needs to be properly controlled in the optical communication systems
The influence of chromatic dispersion can be handled by digital signal processing (DSP), the corresponding power consumption will increase with the chromatic dispersion for correction [15,16]
Summary
Helically phased light carrying orbital angular momentum (OAM) has been well known, as exciting progress on the application of OAM modes has been made in various fields [1,2,3,4]. Comes the demand for designing a fiber supporting OAM mode, and maintaining appropriate dispersion in order to inhibit the signal quality degradation induced by chromatic dispersion and the other nonlinear effects in the WDM system [18,19]. Fibers with positive dispersion are the common choice to transmit the optical signal in the terrestrial systems, while fibers with negative dispersion are widely used to minimize modulation instability in the submarine systems [23]. We propose and design a non-zero dispersion-shifted air-core ring fiber (NZDSARF) for optical OAM mode transmission [24].
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