Multi‐optical carrier generation using a microring resonator to enhance the number of serviceable channels in radio over free space optic

Abstract

A system of radio over free space optic (RoFSO) system using the multi‐optical carriers has been generated by the microring resonators integrating an add/drop filter. These obtained carriers have shown sufficiently stable for propagating in free space channels while experiencing very low dispersion. Moreover, this technique is appropriated for higher capacity that can be serviced in a system of wavelength‐division multiplexing (WDM) RoFSO, where there are 16 carriers created, where each carrier has 12.5 GHz free spectral range (FSR) and 220 MHz full‐width at half‐maximum (FWHM) and 8 orthogonal frequency division multiplex (OFDM) signals, then they separately modulated with 8 out of these 16 carriers. After the modulation, by utilizing an free space optic (FSO) antenna, all carriers have the optical multiplexing and transmission to a FSO channel. On the receiver side, the demultiplexing is performed and finally the performance of the system subsequently is analyzed by calculation of the constellation diagram and error vector magnitude (EVM).

A Tunable Wireless Multicarrier Communication Employing Multiple Vector Modulation With 4QAM-OFDM on a Single Optical Carrier

“…Microwave photonics link (MPL) transmission, radio over fiber or microwave transmission on an optical fiber has been considered as an excellent solution for the future wireless communications due to the low transmission loss, large bandwidth, low cost, anti-interference, low power consumption, and simple architecture of the remote radio-frequency unit [1]- [6]. In order to meet the ever-increasing demand for the higher speed transmission, the future wireless communications need higher optical spectrum efficiency.…”

A widely tunable dual-wavelength based on a microring resonator filter device

“…Pulsed outputs can be realized from a fiber laser through a number of techniques, such as nonlinear polarization rotation and nonlinear loop mirrors [2], or by applying active and passive modulators such as semiconductor saturable absorber mirrors [3] or 2D and 3D nanomaterials such as grapheme [4] and carbon nanotubes as saturable absorbers [5]. Microring resonators (MRRs) have also been proven to be a viable candidate for generating ultrafast pulses in a fiber laser system [6,7]. Derived from larger ring resonators, which find multiple applications in modern optical networks, MRRs allow for high-density optical circuits to be realized due to their compact nature and use of high index contrast [8].…”