- 标题
- 摘要
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- 实验方案
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Regulating the Single-Mode Lasing Intensity of Semiconductor Lasers without Wavelength Shift
摘要： A simple method to regulate the single-mode lasing intensity of semiconductor lasers without wavelength shift is demonstrated in this paper. The basic component is a digital micro-mirror device (DMD), which can be taken as an adjustable two-dimensional grating by its special structure. The lasing peak wavelength and peak intensity are respectively regulated by the DMD angular position and the DMD setting. The lasing peak wavelength could be tuned over by rotating the DMD. Meanwhile, the lasing peak intensity could be regulated by the DMD setting, which generates optical feedback digitally. The regulating speed is very high (up to 10kHz) and has no wavelength shift in the lasing mode, which is more stable and faster than the conventional method.
关键词： optical feedback,Semiconductor lasers,lasing mode regulation
更新于2025-09-16 10:30:52
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Reservoir computing and decision making using laser dynamics for photonic accelerator
摘要： The photonic accelerator is a new paradigm of photonic technologies for artificial intelligence, wherein the systems can accelerate information processing in electronic computing. Schemes for reservoir computing and decision making are promising examples of the photonic accelerator. In this work, we describe recent advances in the architectures of reservoir computing and decision making based on complex photonics, wherein the physics of light, including ultrafast dynamics in semiconductor lasers with optical feedback, plays a crucial role in the photonic accelerator.
关键词： reservoir computing,optical feedback,photonic accelerator,decision making,semiconductor lasers
更新于2025-09-16 10:30:52
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Optical feedback stabilization of a self-mode-locked quantum dot laser
摘要： In this work, the impact of fine-delay tunable dual-cavity optical self-feedback (DC-OFB) on the pulse timing stability and pulse repetition rate (RR) frequency of a 1 mm long single-section self-mode-locked quantum-dot (QD) laser emitting at 1255 nm is studied experimentally and by simulation. By tuning both microscopic dual-cavity delay lengths, we find a maximum RR tuning range of 70 MHz. A two-fold periodic structure is apparent every 25 ps which corresponds to the internal round trip time of the laser. A timing jitter (TJ) reduction by a factor of 16 down to 3.5 fs is obtained. Simulation results reproduce the experimentally observed RR trends with a good qualitative and quantitative agreement.
关键词： quantum-dot laser,Self mode-locking,timing jitter,optical feedback,semiconductor laser,radio-frequency linewidth
更新于2025-09-16 10:30:52
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Passively mode-locked quantum dot laser subject to dual long cavity time-delayed optical feedback
摘要： In this contribution, we study experimentally the impact of two long external passive optical cavities on the repetition rate and timing jitter of a monolithic passively mode-locked InAs/InGaAs quantum dot laser. The dual cavity scheme allows to fully suppress feedback induced sidebands in the radio-frequency spectrum. By fine delay control of the optical self-feedback delay lengths, a repetition rate tunability of 9.4 MHz is achieved. The lowest repetition rate line width amounts to less than 50 Hz, corresponding to a timing jitter of 1.7 fs. We explain the experimentally observed timing jitter and repetition rate trends qualitatively by adapting a versatile simple time-domain model. Both experiment and simulations indicate the strongest pulse train timing jitter reduction at feedback lengths that yield the lowest repetition rate frequency deviation.
关键词： quantum-dot laser,timing jitter,Passive mode-locking,Optical feedback,semiconductor laser,radio-frequency linewidth
更新于2025-09-16 10:30:52
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Influence of integrated optical Feedback on tunable Lasers
摘要： In this paper we explain how to use rate equations to describe a laser that includes integrated optical feedback. We find a relation between the threshold current, the voltage drop at the gain section, output power, linewidth, and side mode suppression ratio, and show experimental results.
关键词： Frequency Stabilization,Continuous Tuning,Gain Voltage,Wavelength Stabilization,Optical Feedback Interferometry,Tunable Laser,Output Power,Rate Equations,Laser Stability,Linewidth,Optical Feedback,Side Mode Suppression Ratio,Wavelength locking
更新于2025-09-12 10:27:22
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[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) - Feedback Insensitive External-Cavity Semiconductor Ring Laser Utilizing a Weak Intracavity Isolator
摘要： External optical feedback (EOF), caused by the return loss of connected circuits, is well known to have a strong impact on the performance of semiconductor lasers [1]. Feedback effects are usually prevented by placing an optical isolator at the output of the laser. A strong isolation value of approximately 60dB is typically required for tunable lasers. It has proven difficult to implement sufficiently strong optical isolators in a form suited to photonic integration [2]. For this reason we have previously proposed a ring laser with weak intracavity isolation to enable a feedback insensitive integrated tunable laser [3]. In such a laser the isolator is used only to enforce unidirectional operation of the device and the returned signal couples in the lossy counter-propagating direction. Using our rate equation analysis it was predicted that 10dB intracavity isolation completely suppresses the effects of EOF over the operating range of interest in terms of output power, linewidth and relative intensity noise. In such a cavity, the weak isolation can now be implemented with known integration schemes [2]. In this contribution we demonstrate for the first time that insensitivity can indeed be achieved using a ring laser with weak intracavity optical isolation. The laser system is schematically shown in Fig. 1 and is implemented using polarization maintaining optical fiber, a multi-quantum well semiconductor optical amplifier and an optical isolator consisting of a free space Faraday rotator and two polarizers. By changing the orientation of the polarizers the amount of isolation can be set, allowing for a direct comparison to our theory. Finally, two 3dB fiber-fused splitters are used as output couplers to make the laser cavity as symmetrical as possible when no isolation is provided.
关键词： intracavity isolation,External optical feedback,optical isolator,ring laser,semiconductor lasers
更新于2025-09-12 10:27:22
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Photonic Reservoir Computing (Optical Recurrent Neural Networks) || 7. Semiconductor lasers as reservoir substrates
摘要： Semiconductor lasers are the most common type of lasers produced, with a wide range of applications that include optical storage systems, communication systems (ranging from short-distance data communication systems to long-haul fiber-optic networks), as pump sources, for material processing, and in many other applications. A recent application, and the topic of this chapter, is the use of semiconductor lasers as substrates for photonic reservoir computers. Here, we present an overview of recent publications and discuss the main properties of photonic reservoir computers based on semiconductor lasers subject to optical feedback. The optical feedback serves as a way to create the recurrence required for reservoir computing in the context of delay-based reservoir computers.
关键词： photonic reservoir computers,optical feedback,Semiconductor lasers,delay-based reservoir computers
更新于2025-09-12 10:27:22
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Optical Feedback Sensitivity of a Semiconductor Ring Laser with Tunable Directionality
摘要： We discuss the sensitivity to optical feedback of a semiconductor ring laser that is made to emit in a single-longitudinal mode by applying on-chip filtered optical feedback in one of the directional modes. The device is fabricated on a generic photonics integration platform using standard components. By varying the filtered feedback strength, we can tune the wavelength and directionality of the laser. Beside this, filtered optical feedback results in a limited reduction of the sensitivity for optical feedback from an off-chip optical reflection when the laser is operating in the unidirectional regime.
关键词： optical feedback,semiconductor ring laser,laser stability
更新于2025-09-12 10:27:22
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Regimes of bandwidth enhancement in coupled-cavity semiconductor laser using photon–photon resonance
摘要： In the last decade, different solutions were proposed to boost the transmission bitrate of semiconductor lasers. Here, we focus on applying optical feedback to a semiconductor laser from an external cavity in order to induce enhancement of the modulation bandwidth up to 50 GHz as well as resonant modulation (RM) around frequencies approaching 60 GHz. High-speed modulation up to 90 Gbps under none-return to zero operation and a 45 Gbaud using pulse amplitude modulation-4 signals are predicted. Both types of improving the modulation performance of the laser are attributed to the photon–photon resonance (PPR) effect. The regimes of the external power reflectivity that correspond to both types of modulation response are specified. Comprehensive simulations are introduced to correlate the PPR frequency to the RM frequencies of the non-modulated coupled-cavity laser. Dependencies of the enhanced BW and PPR frequency on the cavity length and bias current are elucidated.
关键词： optical feedback,photon–photon resonance,modulation bandwidth,high-speed modulation,semiconductor lasers
更新于2025-09-11 14:15:04
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Application of Near-Infrared Optical Feedback Cavity Enhanced Absorption Spectroscopy (OF-CEAS) to the Detection of Ammonia in Exhaled Human Breath
摘要： The qualitative and quantitative analysis to trace gas in exhaled human breath has become a promising technique in biomedical applications such as disease diagnosis and health status monitoring. This paper describes an application of a high spectral resolution optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) for ammonia detection in exhaled human breath, and the main interference of gases such as CO2 and H2O are approximately eliminated at the same time. With appropriate optical feedback, a fibered distributed feedback (DFB) diode laser emitting at 1531.6 nm is locked to the resonance of a V-shaped cavity with a free spectral range (FSR) of 300 MHz and a finesse of 14,610. A minimum detectable absorption coefficient of αmin = 2.3 × 10?9 cm?1 is achieved in a single scan within 5 s, yielding a detection limit of 17 ppb for NH3 in breath gas at low pressure, and this stable system allows the detection limit down to 4.5 ppb when the spectra to be averaged over 16 laser scans. Different from typical CEAS with a static cavity, which is limited by the FSR in frequency space, the attainable spectral resolution of our experimental setup can be up to 0.002 cm?1 owing to the simultaneous laser frequency tuning and cavity dither. Hence, the absorption line profile is more accurate, which is most suitable for low-pressure trace gas detection. This work has great potential for accurate selectivity and high sensitivity applications in human breath analysis and atmosphere sciences.
关键词： trace gas detection,breath gas analysis,ammonia,optical feedback,cavity enhanced absorption spectroscopy
更新于2025-09-11 14:15:04