- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Analysis of optical injection on red and blue laser diodes for high bit-rate visible light communication
摘要： In this work, self-injection and external-injection in ～450 nm InGaN/GaN blue and ～650 nm InGaP/AlGaInP red diode lasers are investigated. A distinct locking characteristic is observed in the self-injection case with small 19 cm cavity length, demonstrating enhanced ～2.34 and ～2.07 GHz 3-dB bandwidths, corresponding to a factor of ～1.4 and ～1.1 improvement, and reduced ～60 and ～80 pm spectral linewidths, for the blue and the red lasers, respectively. Moreover, this short external cavity self-injection locked system exhibited superior performance by a factor of 1.1–1.3 compared to the long cavity (26 cm) configuration. Conversely, the external optical injection exhibited weak locking signature with improved linewidths by a factor of ～1.6–2.8 and reaching as small as ～70 and ～87 pm for the blue laser, respectively, while almost doubling in the peak powers. Later, on–off keying modulation technique based data transmission rates of up to 3.5 and 4.5 Gb/s are demonstrated on free-running blue and red laser diodes, respectively, employing an in-house laser diode mount based system. Moreover, owing to the bandwidth limitation of the optically injected systems, successful transmission of up to 2 Gb/s is demonstrated with better performance compared to the respective free-running cases, in particular, the external-optically injected system demonstrated more than double improvement in the bit-error-rate.
关键词： Visible light communication,Semiconductor laser diodes,External optical injection,Self-injection locking
更新于2025-11-28 14:23:57
-
Laser diodes with modulated optical injection: towards a simple signal processing unit?
摘要： The idea of using the dynamical behaviour of a semiconductor laser to perform a certain processing operation of an input signal has been around for quite a long time. While the unidirectional optical injection scheme seems well suited to such a target—with the injection serving as an optical carrier for the input signal—the impact of a modulation of the injection beam still requires thorough investigation. Here, we study the case of an optically injected laser with a simple single-tone modulation term added to the injection signal. We analyse the impact of amplitude modulation on the laser dynamics, and particularly focus on the evolution within the injection locking range. We highlight clear passband behaviour corresponding to the laser resonance at its relaxation oscillation frequency, and characterize its features for various parameter changes. Next, we report dramatic differences between amplitude and phase modulation as the latter quickly leads to a loss of the injection locking and to the emergence of chaotic dynamics in place from the passband response identified in the case of amplitude modulation. At last, we discuss the suitability of using laser diodes for signal filtering, as was recently proposed by others, and identify the main remaining issues that need to be overcome.
关键词： laser dynamics,optical injection,all-optical processing,semiconductor laser
更新于2025-09-23 15:19:57
-
A tunable self-mixing chaotic laser based on high frequency electro-optic modulation
摘要： A tunable self-mixing chaotic laser based on high frequency electro-optical modulation is proposed. A laser dynamics system is designed and tested for tunable chaotic laser generation and provides optical feedback and electro-optic modulation with two degrees of freedom. The chaotic laser is generated by optical feedback, and it becomes tunable by high frequency electro-optic modulation. The frequency is modulated from 10 MHz to 10 GHz to test this system, and an ultra-wide band chaotic laser from 0.8 GHz to 24 GHz is measured by an electrical spectrum analyzer (ESA). The experimental results show the generation of a tunable chaotic laser via electro-optic modulation. At the same time, this tunable chaotic laser has a highly sensitive dynamic response near the 2.0 GHz range of frequency modulation. The system is proved to be suitable for applications in high-speed broadband communication and sensing.
关键词： Optical injection,Laser self-mixing,Electro-optic modulation,Chaotic laser
更新于2025-09-23 15:19:57
-
Dynamics and spectral characteristics of quantum dot semiconductor lasers under optical injection locking
摘要： The operation of an injection-locked quantum dot laser including the output characteristics, modulation response, and linewidth enhancement factor (LEF) has been investigated in detail considering the effect of homogeneous and inhomogeneous broadenings. Results demonstrate that a single-mode operation is guaranteed for a broad range of homogeneous broadening values (operation temperatures). Injection power-dependant reduction in the threshold current and a large increase in the slope efficiency and the output power have been achieved. Also, a near-zero and uniform LEF is obtained for the whole lasing spectra where drastic reduction from ~60 to 0.76 is observed for non-injected modes. The device exhibits a reduced settling time and modified modulation response especially a reduced frequency overshoot and enhanced 3dB modulation bandwidth. Obtained characteristics provide a design degree of freedom for spectral shaping and single/multi-mode operation which are favorable features for optical signal processing applications.
关键词： Optical injection locking,linewidth enhancement factor,modulation response
更新于2025-09-23 15:19:57
-
All Optical Integrate and Fire Neuromorphic Node based on Single Section Quantum Dot Laser
摘要： In this work we provide numerical results concerning an all-optical inhibitory integrate and fire neuron based on a single section quantum-dot InAs/GaAs laser. The numerical model employs a detailed multi-population approach that accommodates electron-hole dynamics and can efficiently describe waveband transitions from both the ground and excited energy state. The underlying physical mechanism of waveband switching in an inhibitory neuron is unveiled and is attributed to hole-electron’s transport time asymmetries. A detailed dynamical analysis allowed the identification of suitable optical injection regimes so as to trigger highly sought neuro-computational behaviors such as rate encoding and neural spikes with picosecond temporal resolution.
关键词： Cognitive computing,neural-networks,semiconductor lasers,neuromorphic,integrate-and fire neuron,quantum-dots,excitability,optical injection,photonic neuron
更新于2025-09-19 17:13:59
-
Multiscroll chaotic attractors in Optical Injected Semiconductor Laser Driven by a Resonant Tunneling Diode Current
摘要： This paper shows a complex nonlinear dynamics of an optically injected laser diode (LD) between a free-running laser and a perturbed laser. A bifurcation diagram analysis sustained Lyapunov exponents’ spectra reveals chaotic and quasi-periodic dynamics for restricted ranges of directly modulated by electrical current from a resonant tunneling diode (RTD) circuit. The LD model evolves a new control parameter called effective gain coefficient (EGC) and can switch the frequency ??????and by EGC variations, including the generation of the hyperchaotic regime and multiscroll chaotic attractors through a cascade of periodic oscillations to the chaos. Moreover, an implementation of this new coupled system also shows that when an AC signal ?????? ??????(2??????????) is added to the DC voltage bias, the LD outputs show several optical signals such as periodic, injection.
关键词： chaotic attractors,optical injection,semiconductor laser,resonant tunneling diode,Optoelectronic circuit
更新于2025-09-19 17:13:59
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Optical Frequency Comb Generation using Quantum Cascade Lasers Subject to Optical Injection
摘要： Mid-infrared optical frequency combs (OFCs) are of prime importance for spectroscopy detection of many gas molecules, such as carbon dioxide and methane because of their strong absorption lines in the mid-infrared regime. Quantum cascade laser (QCL) is one of the dominate mid-infrared laser sources, however it is hard to obtain OFCs using the common mode locking technique due to the ultrashort carrier lifetime. On the other hand, QCLs have successfully produced OFCs based on the four-wave mixing effect, the difference-frequency process, and the Kerr nonlinearity. This work proposes to use the period-one (P1) dynamics of QCLs subject to optical injection for OFC generation.
关键词： Optical Frequency Comb,Spectroscopy,Mid-infrared,Quantum Cascade Laser,Optical Injection
更新于2025-09-16 10:30:52
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Optical Frequency Comb Generation from Semiconductor Lasers using Optical Injection and Pulsed Gain Switching
摘要： An Optical Frequency Comb (OFC) Generator is a laser source emitting a coherent radiation with an equally spaced group of optical frequencies. OFCs have been used in numerous fields, such as optical communications, RF photonics and infrared spectroscopy. Relatively low repetition rate OFCs (100-1000 MHz) are especially suited for dual comb spectroscopic applications. Low repetition rate OFCs from Gain-Switched (GS) semiconductor lasers using sinusoidal excitation have been reported for spectroscopic applications. On the other hand, the generation of ultra-short optical pulses by pulsed excitation GS has been demonstrated, but as far as we know, it has not been used for OFC generation. In this work, we consider pulsed GS in combination with optical injection (OI) to generate low repetition rate OFCs, and we demonstrate a high performance in terms of noise, flatness and bandwidth. The OFC generator is based on a master-slave configuration. The Slave Laser (SL), a Discrete Mode Laser (DML), is driven in GS operation using a combination of two signals: a bias current and a square signal provided by a pulse pattern generator, with different duty cycles and driving conditions. High-resolution spectra were analyzed with a Brillouin Optical Spectrum Analyzer (BOSA).
关键词： Optical Frequency Comb,Pulsed Gain Switching,Semiconductor Lasers,Dual Comb Spectroscopy,Optical Injection
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Optical-injection-seeded Optical Frequency Comb Generation Promoted by the Sub-harmonic Modulation
摘要： Generated optical frequency combs based on recycling frequency shift have more ultrashort optical pluses and better flatness, but suffer from uncertainty of phase relationship among the comb lines and also larger carrier noise [7]. In this work, we propose a new scheme for generating optical frequency comb based on a basic optical injection system assisted by the sub-harmonic modulation, which features with the simple configuration, good flatness, tunable and flexible comb spacing and comb lines, certainty of phase relationship and lower carrier noise.
关键词： sub-harmonic modulation,optical injection,nonlinear period-one oscillation state,Optical frequency comb
更新于2025-09-16 10:30:52
-
[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - High-resolution frequency and phase control of a terahertz laser
摘要： We report on the high-resolution frequency and phase control of a terahertz (THz) quantum cascade laser (QCL). The 2.0 THz QCL is locked to a stable microwave reference frequency via an all-fibre infrared frequency comb. The frequency of the QCL is controlled by optical injection and the phase is independently controlled by introducing a phase-lock loop that provides electronic feedback to the QCL, forming an optical injection phase locked loop (OIPLL). By implementing this, (1) the instrument limited linewidth of the locked QCL was <1Hz (2) for a fixed frequency, the phase of the THz QCL relative to the microwave reference frequency can be controlled within a range 0.3(cid:2).
关键词： optical injection phase locked loop,phase control,quantum cascade laser,frequency control,terahertz
更新于2025-09-16 10:30:52