Numerical study of ultrashort-optical-feedback-enhanced photonic microwave generation using optically injected semiconductor lasers at period-one nonlinear dynamics

Abstract

This study numerically investigates the enhancement of photonic microwave generation using an optically injected semiconductor laser operating at period-one (P1) nonlinear dynamics through ultrashort optical feedback. For the purpose of practical applications where system miniaturization is generally preferred, a feedback delay time that is one to two orders of magnitude shorter than the relaxation resonance period of a typical laser is emphasized. Various dynamical states that are more complicated than the P1 dynamics can be excited under a number of ultrashort optical feedback conditions. Within the range of the P1 dynamics, on one hand, the frequency of the P1 microwave oscillation can be greatly enhanced by up to more than three folds. Generally speaking, the microwave frequency enhances with the optical feedback power and phase, while it varies saw-wise with the optical feedback delay time. On the other hand, the purity of the P1 microwave oscillation can be highly improved by up to more than three orders of magnitude. In general, the microwave purity improves with the optical feedback power and delay time, while it only varies within an order of magnitude with the optical feedback phase. These results suggest that the ultrashort optical feedback provides the optically injected laser system with an extra degree of freedom to manipulate/improve the characteristics of the P1 microwave oscillation without changing the optical injection condition.

Characteristics of microwave photonic signal generation using vertical-cavity surface-emitting lasers with optical injection and feedback

“…8 sho the generated is 0.1 ns -1 and that the linew longer externa different trend drop, and then the side-peak those in [21]. are not observ due to the dif [34] are less linewidth and than 1ns. ack delay effect of result is ps are set y time of sponding f the two delays exchange.…”

Exploiting the Nonlinear Dynamics of Optically Injected Semiconductor Lasers for Optical Sensing

“…Further testing using realistic noise levels is of course necessary, in order to find model parameters such that the laser dynamics is robust to noise, while is sensitive to deterministic perturbations of the injected field. An interesting setup to analyze is that of ultra-short optical feedback [17]. Further work will probably also aim to compare the detection method proposed here, which exploits the excitable properties of the laser dynamics, with more traditional approaches for sensing.…”

Effects of Asymmetric Coupling Strength on Nonlinear Dynamics of Two Mutually Long-Delay-Coupled Semiconductor Lasers

“…Such a spectral feature is a typical signature of the P1 dynamics. This generates a microwave at f 0 = 20.06 GHz and its harmonics after photodetection, as illustrated in Figure 2(b-ii), which is highly advantageous for high-frequency microwave generation [34][35][36][37][38]. Due to the round-trip delay coupling, there also appears a small bump around 0 GHz, which consists of several spectral components equally separated by 12.45 MHz, as those shown in the inset of Figure 2(b-i).…”