The paper presents a photonic integrated circuit (PIC) design that offers a high degree of integration of building blocks required to implement a swept-source optical coherence tomography (SS-OCT) system. The device includes an interferometer, sample arm, k-clock, and a tunable reference path integrated on a single chip implemented based on the silicon nitride fabrication platform. The PIC elements are optimized to perform low losses and minimal dispersion around a central operation wavelength of 1310 nm, which is critical for applications such as OCT. The device was simulated using Ansys Lumerical software. Simulation results show that the proposed PIC provides precise control of the scanning depth with a resolution of 0.725 nm/mV. Also, the frequency of the OCT signal does not exceed 17 GHz for scanning distances below 5 mm.

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.

The paper presents the design of the photonic integrated circuit (PIC) for the dual-band swept-source optical coherence tomography (SS-OCT) system. The designed PIC includes two interferometric schemes for the 820-880 nm and 1260-1360 nm wavelength ranges and optical triggers for both schemes. We developed PIC for the silicon nitride platform because it provides lower losses than other integrated photonics platforms. We made design verification with numerical simulation in the Ansys Lumerical software.

Based on a time-domain model, we demonstrate that a periodic train of pulses can be generated in a system of two coupled W-band TWTs operating in regimes of amplification and saturable absorption, respectively. For saturable absorption the Kompfner dip regime implemented by a proper matching of the tube parameters. According to simulations with the parameters of an experimentally realized TWT, the peak power of generated pulses with a duration of 150 ps can achieve 100 W.

The paper presents a photonic integrated circuit (PIC) concept for dual-band swept-source optical coherence tomography (SS-OCT). We designed the PIC for work with two swept sources with operation bands 820-880 nm and 1260-1360 nm. The PIC contains reference and sample arms and k-clocks for both bands. In both cases, k-clocks are unbalanced MachZehnder interferometers with a free spectral range greater or equal to the light sources’ operation bands. The PIC is developed for a silicon nitride manufacturing platform with minimum losses.