ORCID Profile
0000-0003-3905-7162
Current Organisation
University of Wollongong
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Publisher: The Optical Society
Date: 05-02-2019
DOI: 10.1364/OE.27.004090
Publisher: IEEE
Date: 05-2018
Publisher: IEEE
Date: 11-2015
Publisher: Optica Publishing Group
Date: 2022
DOI: 10.1364/ASSL.2022.JTU6B.1
Abstract: By investigating nonlinear dynamics in a semiconductor laser subjected to optical feedback, a broadband microwave frequency comb is generated with a bandwidth of 7.5 GHz and a maximum of 98 comb lines.
Publisher: OSA
Date: 2019
Publisher: SPIE
Date: 12-11-2019
DOI: 10.1117/12.2542368
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2018
Publisher: Optica Publishing Group
Date: 2022
Abstract: A new scheme for generating dual-wavelength laser source is proposed by using laser dynamics subjected to optical feedback. This method can achieve extremely wide tunable range of dual frequency separation while providing an ease of implementation and simplicity in system configuration.
Publisher: IEEE
Date: 09-10-2023
Publisher: SPIE
Date: 12-11-2019
DOI: 10.1117/12.2542592
Publisher: IEEE
Date: 09-10-2023
Publisher: Optica Publishing Group
Date: 18-03-2022
DOI: 10.1364/OE.453563
Abstract: Und ed relaxation oscillation (RO) in a laser self-mixing interferometry (SMI) system may occur in some common application conditions, which may impact the stable operation of the system and degrade its sensing performance. In this work, we proposed to suppress the und ed RO by controlling the system operation parameters in a laser SMI sensing system. By numerically solving the famous Lang Kobayashi equations, the stability of a laser SMI system in a 3-parameter space of external cavity length, injection current and optical feedback factor were investigated. Based on the stability analyses, we determined the system operation conditions required for suppressing the und ed RO and derived an analytical expression for describing the relationship between the operation parameters. An experimental SMI system based on a laser diode (Sanyo, DL4140-001s) was implemented and verified the suppressing method. The experimental results showed that the SMI system in a moderate feedback regime can operate in steady state without und ed RO by setting proper operation parameters. This work provides useful guidance to design a stable SMI sensing system for practical applications.
Publisher: MDPI AG
Date: 05-11-2020
DOI: 10.3390/S20216303
Abstract: A novel Dual-frequency Doppler LiDAR (DFDL) is presented where the dual-frequency light source is generated by using external optical feedback (EOF) effect in a laser diode (LD). By operating a LD at period-one (P1) state and choosing suitable LD related parameters, a dual-frequency light source can be achieved. Such a dual-frequency source has advantages of the minimum part-count scheme, low cost in implementation, and ease in optical alignment. Theory and system design are presented for the proposed DFDL for velocity measurement with high measurement resolution. The proposed design has a potential contribution to the Light Detection And Ranging (LiDAR) in practical engineering applications.
Publisher: MDPI AG
Date: 29-08-2022
Abstract: Self-mixing interferometry (SMI) is a promising sensing technology. As well as its compact structure, self-alignment and low implementation cost, it has an important advantage that conventional two-beam interferometry does not have, i.e., SMI signal fringe evolves into asymmetrical shape with increasing optical feedback level, which leads to discrimination of target movement directions for unambiguous displacement measurement possible by a single-channel interferometric signal. It is usually achieved by using SMI signals in moderate feedback regime, where the signals exhibit hysteresis and discontinuity. However, in some applications, e.g., in biomedical sensing where the target has a low reflectivity, it is hard for the SMI system to operate in a moderate feedback regime. In this work, we present comprehensive analyses on SMI signal waveforms for determining system parameters and movement directions by a single-channel weak feedback SMI signal. We first investigated the influence of two system parameters, i.e., linewidth enhancement factor and optical feedback factor, on the symmetry of SMI signals. Based on the analyses on signal waveform, we then proposed a method of estimating the system parameters and displacement directions. The method was finally verified by experiments. The results are helpful for developing sensing applications based on weak feedback SMI systems.
Publisher: OSA
Date: 2019
Publisher: Optica Publishing Group
Date: 2021
Abstract: Based on a laser diode with optical feedback, the influence of system controllable parameters on chaotic lidar sensing performance is analyzed. Then, guidance on parameter selection rule for generating high-quality chaotic signals is provided.
Publisher: MDPI AG
Date: 26-01-2022
DOI: 10.3390/S22030963
Abstract: In this study, a novel distance sensing method is presented by using a semiconductor laser (SL) with optical feedback (OF) and operating the SL at a switching status happened between two nonlinear dynamic states (stable state and period-one state). In this case, without the need for any electronic or optical modulation devices, the laser intensity can be modulated in a square wave form due to the switching via utilizing the inherent SL dynamics. The periodicity in the switching enables us to develop a new approach for long-distance sensing compared to other SL with OF-based distance measurement systems and lift the relevant restrictions that existed in the systems. Moreover, the impact of system controllable parameters on the duty cycle of the square wave signals generated was investigated on how to maintain the proposed system robustly operating at the switching status. Both simulation and experiment verified the proposed sensing approach.
Publisher: Optica Publishing Group
Date: 2021
Abstract: A new dual-frequency Doppler lidar (DFDL) system is proposed by using a periodic window with Period-6 of laser dynamics subjected to optical feedback. This method has a good velocity resolution while providing ease of implementation.
Publisher: Elsevier BV
Date: 02-2024
Publisher: Optica Publishing Group
Date: 2020
Abstract: We propose an optical simulation platform to realize the rich nonlinear dynamics of semiconductor lasers with external feedback by solving the well-known Lang and Kobayashi rate equations through the fourth-order Runge-Kutta method.
Publisher: IEEE
Date: 05-2018
Publisher: MDPI AG
Date: 31-10-2023
DOI: 10.3390/S23218872
Publisher: OSA
Date: 2019
Publisher: Optica Publishing Group
Date: 19-01-2021
DOI: 10.1364/OE.414849
Abstract: Semiconductor lasers (SLs) show relaxation oscillation (RO) due to the cavity d ing rate being higher than the carrier d ing rate. The presence of RO in SLs contributes to abundant complex dynamics when the laser is perturbed by external optical feedback (EOF). In this work, the influence of feedback optical phase on the relaxation oscillation frequency (ROF) in an SL is investigated both theoretically and experimentally. By numerically solving the well-known Lang Kobayashi equations, the relationship between the ROF and feedback optical phase was obtained, which shows ROF is in a sinusoidal manner with respect to the feedback optical phase under weak feedback strength. A simplified mathematic expression for ROF was derived to describe such a sinusoidal relationship. Potential sensing applications can be developed based on the relationship. As an ex le, a new method of measuring linewidth enhancement factor of an SL was presented. Finally, an experimental setup was built and experiments were carried out to verify the relationship and the measurement method for linewidth enhancement factor.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-06-2021
Publisher: AIP Publishing
Date: 07-2019
DOI: 10.1063/1.5098811
Abstract: Laser dynamics have great potential for various applications, ranging from cryptography to microwave photonics and instrumentation. This letter presents a design for achieving high sensitive sensing and measurement using the dynamics of a laser diode (LD) with a dual external cavity. In the design, one cavity is used to control the dynamics, making the LD operate at the period-one (P1) oscillation state, and the other one is associated with the quantities to be measured. The Lang-Kobayashi equations are modified and solved to develop a bifurcation diagram for the design, from which we determine the P1 state and investigate the sensing performance within this state. It is shown that, when operating in P1, the laser intensity exhibits an oscillation with its litude modulated by a traditional optical feedback interferometric (OFI) signal (generated with a single cavity and LD operating at the steady state). It is also observed that the modulation depth is remarkably larger than the magnitude of a traditional OFI signal. This leads to a significant increase in the sensitivity of sensing and measurement and hence provides an attractive solution for the detection of very small or weak physical quantities. An experimental system is designed, and the experimental results verify the high sensitive sensing performance of the proposed design.
Publisher: Elsevier BV
Date: 03-2018
Publisher: SPIE
Date: 06-11-2018
DOI: 10.1117/12.2500737
Publisher: SPIE
Date: 06-11-2018
DOI: 10.1117/12.2500739
Publisher: OSA
Date: 2019
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 15-10-2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2020
Publisher: IEEE
Date: 09-10-2023
Publisher: MDPI AG
Date: 16-11-2018
DOI: 10.3390/S18114004
Abstract: This paper presents a new method for measuring the linewidth enhancement factor (alpha factor) by the relaxation oscillation (RO) frequency of a laser with external optical feedback (EOF). A measurement formula for alpha is derived which shows the alpha can be determined by only using the RO frequencies and no need to know any other parameters related to the internal or external parameters associated to the laser. Unlike the existing EOF based alpha measurement methods which require an external target has a symmetric reciprocate movement. The proposed method only needs to move the target to be in a few different positions along the light beam. Furthermore, this method also suits for the case with alpha less than 1. Both simulation and experiment are performed to verify the proposed method.
Publisher: Elsevier BV
Date: 11-2022
Publisher: MDPI AG
Date: 16-06-2018
DOI: 10.3390/S18061956
No related grants have been discovered for Yuxi Ruan.