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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
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Improved analytical model of phase-locking dynamics in unlocked-driven optoelectronic oscillators under RF injection locking
摘要： In this paper, we propose an improved closed form large injection perturbation analytical model for accurately studying the phase-locking dynamics and frequency pulling phenomenon in optoelectronic oscillator (OEO) for radio frequency (RF) signal injection. We provide formulas for the lock-range, and the beat frequency, which are general and accurate in estimating the degree of phase perturbation in unlocked-driven OEO under weak as well as strong injection signal level. We also give closed form expressions for the spectral components of the unlocked-driven oscillator. It is shown that our model is capable of predicting the phase-locking and estimating the frequency pulling of RF driven OEO under weak and strong injection signal level. The accuracy of the proposed model is verified by the simulations.
关键词： Beat frequency,Injection locking,Phase-locking dynamics,Lock-range and spectral components
更新于2025-09-23 15:23:52
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[IEEE 2019 International Topical Meeting on Microwave Photonics (MWP) - Ottawa, ON, Canada (2019.10.7-2019.10.10)] 2019 International Topical Meeting on Microwave Photonics (MWP) - Inter-modal Laser Based RF Output Stabilization Using Forced SILPLL Technique
摘要： Low phase noise oscillator is very important for communication and high-resolution imaging system. A small size synthesizer realization using inter-modal output of multi-mode semiconductor laser is proposed and tested in this paper. It uses the forced technique self-injection locking, self-phase locking combination to stabilize the related inter-modal output. The realized phase noise is -98 dBc/Hz at 10 kHz offset at X-band operation which shows 68 dB improvement comparing with inter-modal free running output.
关键词： inter-modal output,multi-mode semiconductor laser,synthesizer,phase noise,self-phase locking,self-injection locking
更新于2025-09-23 15:21:01
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Injection locking of multiple auto-oscillation modes in a tapered nanowire spin Hall oscillator
摘要： Spin Hall oscillators (SHO) are promising candidates for the generation, detection and amplification of high frequency signals, that are tunable through a wide range of operating frequencies. They offer to be read out electrically, magnetically and optically in combination with a simple bilayer design. Here, we experimentally study the spatial dependence and spectral properties of auto-oscillations in SHO devices based on Pt(7 nm)/Ni80Fe20(5 nm) tapered nanowires. Using Brillouin light scattering microscopy, we observe two individual self-localized spin-wave bullets that oscillate at two distinct frequencies (5.2 GHz and 5.45 GHz) and are localized at different positions separated by about 750 nm within the SHO. This state of a tapered SHO has been predicted by a Ginzburg-Landau auto-oscillator model, but not yet been directly confirmed experimentally. We demonstrate that the observed bullets can be individually synchronized to external microwave signals, leading to a frequency entrainment, linewidth reduction and increase in oscillation amplitude for the bullet that is selected by the microwave frequency. At the same time, the amplitude of other parasitic modes decreases, which promotes the single-mode operation of the SHO. Finally, the synchronization of the spin-wave bullets is studied as a function of the microwave power. We believe that our findings promote the realization of extended spin Hall oscillators accomodating several distinct spin-wave bullets, that jointly cover an extended range of tunability.
关键词： spin-wave bullets,injection locking,auto-oscillations,Brillouin light scattering microscopy,Spin Hall oscillators
更新于2025-09-23 15:21:01
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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
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Tunability of the Freea??Spectral Range by Microwave Injection into a Mida??Infrared Quantum Cascade Laser
摘要： The free-spectral range (FSR) of quantum cascade lasers (QCLs) emitting at 4.7 μm can be tuned through direct microwave modulation. The intrinsic short carrier lifetime of inter-subband transitions, along with impedance matched electrical packaging, allows a high-speed modulation up to more than 30 GHz. A signi?cant broadening and ?attening of the lasing spectrum is observed under radio frequency (RF) injection with frequencies close to the round-trip cavity. An accurate analysis of the high resolution spectra of the laser shows a comb-like regime for both free-running and RF modulated QCLs, if the modulation frequency is within the locking-range of the device. One of the main advantages of collecting high-resolution mid-infrared spectra, over the plain investigation of the beatnote in the microwave region, is the access to all the longitudinal modes and thus the accurate measure of the FSR over the whole optical spectrum. The use of high-resolution spectroscopy provides an in-depth and comprehensive analysis of lasing spectra under microwave modulations.
关键词： quantum devices,mid-infrared region,injection locking,tunability of the free-spectral-range,ultrafast devices
更新于2025-09-23 15:19:57
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Generation of phase-locked beams by injection locking of extended-cavity diode lasers for atom interferometers
摘要： We report a novel method of generation of two phase-locked beams with a frequency offset at 6.834 GHz. The output of a master laser is modulated by an EOM and further injected into a slave laser that is an extended-cavity diode laser (ECDL). The ECDL amplifies laser power, and filters out unwanted modes (mostly the opposite sideband and the carrier mode) which could interfere Raman transitions and cause laser power fluctuations due to interference effect with the master laser. By injection locking, the slave laser to the first-order sideband of the modulated master laser beam, we achieve a phase noise below ? 50 dBc/Hz at the frequency range between 10 Hz and 100 kHz. The generated phase-locked beams are applicable to light pulse atom interferometers as the Raman lasers.
关键词： extended-cavity diode lasers,phase-locked beams,injection locking,atom interferometers
更新于2025-09-23 15:19:57
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Photon-driven broadband emission and frequency comb RF injection locking in THz quantum cascade lasers
摘要： We present homogeneous quantum cascade lasers (QCLs) emitting around 3 THz which display bandwidths up to 950 GHz with a single stable beatnote. Devices are spontaneously operating in a harmonic comb state, and when in a dense mode regime they can be injection locked at the cavity roundtrip frequency with very small RF powers down to -55 dBm. When operated in the electrically unstable region of negative differential resistance, the device displays ultra-broadband operation exceeding 1.83 THz (?f /f = 50%) with high phase noise, exhibiting self-sustained, periodic voltage oscillations. The low CW threshold (115 A· cm?2) and broadband comb operation (?f /f = 25%) make these sources extremely appealing for on-chip frequency comb applications.
关键词： quantum cascade laser,terahertz,domain formation,injection locking,frequency comb
更新于2025-09-23 15:19:57
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Radio Over Fiber-Based Wavelength Division Multiplexed/Time Division Multiplexed Passive Optical Network Architecture Employing Mutual Injection Locked Fabry-Perot Laser Diodes
摘要： We demonstrate a radio-over-fiber-based hybrid wavelength-division-multiplexed/time division multiplexed passive optical network (PON) to transmit 5 Gbps data rate to serve 32 subscribers. A broadband light source (BLS) is realized by mutual injection locking between two Fabry-Perot laser diodes at the transmission section to seed wavelength-division-multiplexed channels. Mutual injection locking technique is used to enhance the performance over single Fabry-Perot laser diode and 15 dB/Hz improvements in relative intensity noise(RIN) is realized in our proposed network system. All-optical up-conversion of a 10-GHz 1.25 Gbps on off keying radio frequency (RF) signal is achieved using one single-arm Mach-Zehnder modulator (MZM). Transmission performance over 25-km single mode fiber is investigated. Low bit error rate with enhanced eye-diagram is obtained in our proposed system. As a result, the radio over fiber (ROF)-based wavelength-division-multiplexed/time division multiplexed PON set up employing mutually injection locked Fabry-Perot laser diodes can be a better choice in high speed long-haul optical communication system.
关键词： ROF,RIN,WDM-PON,mutual injection locking,TDM-PON
更新于2025-09-23 15:19:57
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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) - Thermally-Induced Nonlinear Spatial Shaping of Infrared Femtosecond Pulses in Nematic Liquid Crystals
摘要： This paper presents a fully synthesizable phase-locked loop (PLL) based on injection locking, with an interpolative phase-coupled oscillator, a current output digital-to-analog converter (DAC), and a fine resolution digital varactor. All circuits that make up the PLL are designed and implemented using digital standard cells without any modification, and automatically Place-and-routed (P&R) by a digital design flow without any manual placement. Implemented in a 65 nm digital CMOS process, this work occupies only 110 μm × 60 μm layout area, which is the smallest PLL reported so far to the best knowledge of the authors. The measurement results show that this work achieves a 1.7 ps RMS jitter at 900 MHz output frequency while consuming 780 μW DC power.
关键词： standard cell,digital varactor,small area,low power,gated injection,injection-locking,dual loop,PLL,synthesizable,logic synthesis,edge injection,low jitter,PVT,AD-PLL,DAC,CMOS
更新于2025-09-19 17:13:59