This research introduces a numerical design of an air-core vortex polymer optical fiber in cyclic transparent optical polymer (CYTOP) that propagates 32 orbital angular momentum (OAM) modes, i.e., it may support up to 64 stable OAM-states considering left- and right-handed circular polarizations. This fiber seeks to be an alternative to increase the capacity of short-range optical communication systems multiplexed by modes, in agreement with the high demand of low-cost, insensitive-to-bending and easy-to-handle fibers similar to others optical fibers fabricated in polymers. This novel fiber possesses unique characteristics: a diameter of 50 µm that would allow a high mechanical compatibility with commercially available polymer optical fibers, a difference of effective index between neighbor OAM modes of around 10⁻⁴ over a bandwidth from 1 to 1.6 µm, propagation losses of approximately 15 × 10⁻³ dB/m for all OAM modes, and a very low dispersion for OAM higher order modes (±l = 16) of up to +2.5 ps/km-nm compared with OAM lower order modes at a telecom wavelength of 1.3 µm, in which the CYTOP exhibits a minimal attenuation. The spectra of mutual coupling coefficients between modes are computed considering small bends of up to 3 cm of radius and slight ellipticity in the ring of up to 5%. Results show lower-charge weights for higher order OAM modes.

In this paper, we describe analytically the propagation of Airy-type pulses truncated by a finite-time aperture when second- and third-order dispersion effects are considered. The mathematical method presented here, which is based on the superposition of exponentially truncated Airy pulses, is very effective and allows us to avoid the use of time-consuming numerical simulations. We analyze the behavior of the time-truncated ideal Airy pulse and also the interesting case of a time-truncated Airy pulse with a “defect” in its initial profile, which reveals the self-healing property of this kind of pulse solution.

In this paper, we propose an analytic method capable of describing time truncated Airy-type pulses in material media with quadratic dispersion. The method is based on the superposition of exponentially apodized Airy pulses and provides a simple, elegant and fast way to obtain the pulse evolution and its characteristic resistance to the dispersion effects for long distances.

In this work, we present a numerical design of an air-core vortex polymer optical fiber in CYTOP that propagates modes with orbital angular momentum (OAM) at a visible wavelength of 633 nm. In this fiber, we show a stable propagation of up to 14 OAM states, even under perturbations such as changes in the circularity that leads to elliptic rings in the fabrication processes. Considering ellipticity less than 2%, we obtain charge weights lower than -38 dB between neighbor OAM modes, and around -0.25 dB for OAM modes of the same value, showing that OAM modes are uncoupled after perturbation like the ellipticity.

We use numerical simulations to show that, even under common perturbations such as waveguide bends, pedestal waveguides are suited for stable propagation of modes carrying orbital angular momentum (OAM) in integrated devices.

In this work, we present a numerical design of a pedestal waveguide as a suitable alternative for coupling between few-mode fibers and integrated devices. The proposed waveguide has a cylindrical core deposited over a pedestal base. Numerical simulations are performed to show that modes propagating in pedestal waveguides possess an electric field profile similar to the LP modes in few-mode fibers. The power coupling between these two devices can reach values up to than 96% (-0.18 dB). Besides this, the pedestal waveguide has low insertion loss (IL) and the return loss is around 8 dB. This approach is a suitable alternative in the study of multimode integrated devices in order to work alongside few-mode fibers.