The up-to-the-date electrical systems for beamsteering of the phased antenna arrays are widely used; however, possessing significant drawbacks, including high losses, electromagnetic interference, and high power consumption. To overcome these challenges, microwave photonic systems, both discrete and integrated, have demonstrated outstanding potential. In this context, we discuss the two primary methods for beamsteering, i.e., true time delay (TTD) and phase shift (PS). This paper provides simulation results for a four-channel photonic integrated circuit (PIC) for beamsteering based on the TTD method. The PIC design could be implemented on any fabrication platform. The results demonstrate the approach’s feasibility and its potential to improve the performance of phased array antenna systems.
The paper proposes a photonic integrated circuit (PIC) design for multi-channel swept-source optical coherence tomography (SS-OCT) with a high-scale elements integration on the chip. The PIC contains a tunable reference arm, four spaced apart sample arms, a k-clock based on an unbalanced Mach-Zehnder interferometer, an OCT interferometer, and balanced photodiodes. The PIC is developed for a silicon nitride manufacturing platform, providing minimum losses. The simulation results demonstrate the possibility of simultaneous reception of OCT data from four different points of the studied tissue sample, which can significantly increase the scanning speed.
In this paper we propose a design of an integrated wavelength-tunable vortex beam emitter based on the silicon photonics platform. The proposed device utilizes the free-plasma dispersion effect in order to change the effective index of the ring waveguide, which leads to displacement of the resonant wavelengths. This scheme allows to bypass the dependence of the emitter resonant characteristics from the fabrication errors. Our simulations also show that for the micro-ring resonators with a small free spectral range it becomes possible to switch the emitted vortex order keeping the same wavelength. Such capabilities make the proposed emitter useful in a wide applications range from communication systems to sensors.
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