- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Polarization-dependent High Quality Optical Frequency Comb Generator Based on Recirculating Frequency Shift
摘要： A polarization-dependent optical frequency comb (OFC) generation scheme based on recirculating frequency shift (RFS) is proposed and demonstrated. A dual-parallel Mach-Zehnder modulator (DPMZM) is employed to perform the carrier suppressed single sideband (CS-SSB) modulation and a polarization modulator (PolM) is adopted to generate a 5-line OFC. They are working in two orthogonal polarizations, respectively. The simulation results show that the proposed scheme can generate a 120-line OFC with flatness of 3.91 dB.
关键词： recirculating frequency shift (RFS),optical frequency comb (OFC),flatness,carrier suppressed single sideband modulation (CS-SSB)
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Photonics-based Multiband Radar Applying an Optical Frequency Sweeping Comb and Photonic Dechirp Receiving
摘要： A photonics-based multiband radar is proposed based on an optical frequency sweeping comb and photonic dechirp receiving. The proposed radar has a simple structure, and it is capable to simultaneously generate and process multiple in different frequency bands. Besides, the radar receiver can achieve fast or real-time signal processing with low-speed electronics. In the proof-of-concept experiment, a photonics-based dual-band radar working in K-band (19-22 GHz) and Ka-band (34-37 GHz) is demonstrated with a bandwidth of 3 GHz in each band and a sampling rate of 100 MSa/s in the receiver.
关键词： dechirp processing,multiband radar,optical frequency comb,microwave photonics
更新于2025-09-19 17:15:36
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Optical frequency comb generation with low temperature reactive sputtered silicon nitride waveguides
摘要： Integrated silicon nitride (SiN) waveguides with anomalous dispersion have the potential to bring practical nonlinear optics to mainstream photonic integrated circuits. However, high-stress and high-processing temperatures remain an obstacle to mass adoption. We report low-stress, high-confinement, dispersion-engineered SiN waveguides utilizing low temperature grown reactive sputtered thin-films. We demonstrate a microring resonator with an intrinsic quality factor of 6.6 × 105, which enabled us to generate a native free spectral range spaced frequency comb with an estimated on-chip pump power of 850 mW. Importantly, the peak processing temperature is 400 ○C making this approach fully back-end compatible for hybrid integration with preprocessed CMOS substrates and temperature sensitive photonic platforms such as lithium niobate on insulator.
关键词： reactive sputtering,optical frequency comb,silicon nitride waveguides,photonic integrated circuits,nonlinear optics
更新于2025-09-19 17:13:59
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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) - 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
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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) - 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
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[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
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[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) - THz-wave Signal Generation based on Optical Frequency Comb by One MZM
摘要： We propose a novel Terahertz-wave (THz-wave) signal generation based on optical frequency comb by only one single-drive MZM in 0.4 THz band by simulation. Bit-error-ratio (BER) curves of the QPSK and 16QAM signal proved feasible.
关键词： Modulation,THz-wave signal,Optical frequency comb
更新于2025-09-16 10:30:52
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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) - All-Fiber Source for Generation of Tunable Broadband f <sub/>CEO</sub> -Free Mid-IR Pulses for Laser Spectroscopy Applications
摘要： Recent decade brought a tremendous progress laser-based gas detection techniques. This progress would not be possible without the relentless devotion of the scientific community in developing state-of-the-art sources capable of targeting strong absorption lines of gases localized in the mid-infrared (mid-IR) wavelength region. Although narrowband, semiconductor-based mid-IR lasers offer non-complex implementation their tuning range is usually limited to several cm-1. Therefore designing a sensor capable of simultaneous monitoring of several gas species, even with absorption profiles clustered nearby, requires incorporating individual expensive quantum cascade laser (QCL) or interband cascade laser (ICL) sources into a single platform. Recent development of reliable mid-IR comb sources, combined with clever methods of signal processing allowed for designing gas sensors capable of simultaneous monitoring of several gas analytes in fractions of a second [1]. Obtaining broadband pulsed radiation in the mid-IR region is usually accomplished by utilizing nonlinear conversion or in recently presented on-chip QCL combs [2]. Although QCL combs offer compactness and efficiency they do not allow straightforward control of the repetition frequency (frep) or the carrier-envelope offset frequency (fCEO), which are critical in some particular cavity-enhanced comb-based sensing techniques, e.g. Vernier spectroscopy [3]. Here we present a fully-fiberized, fCEO-free mid-IR optical frequency comb source capable of covering 6 – 9 μm wavelength region with tunable frep. The setup of the source is presented in Fig 1. The heart of the source is a ring-cavity graphene mode-locked laser generating sub-250 fs pulses at 1560 nm and frep of 100 MHz. The pulses are split using a 50/50 coupler and directed to separate sections of the source. In the blue section the source the pulses are amplified to 80 mW in an all-fiber-based chirped pulse amplifier (CPA) and recompressed in a 8 m-long section of PM1550 fiber to ~200 fs. In the red section a custom manufactured nonlinear fiber with tailored dispersion (PCF) is utilized to soliton-shift the 1.56 μm pulses into the 1.9 - 2 μm wavelength region. Subsequently the pulses are amplified in a CPA and recompressed to ~200 fs. Combined 1.56 and 2 μm pulses are focused on a 3 mm-long orientation patterned gallium phosphide (OP-GaP) crystal to generate mid-IR radiation via differential frequency generation (DFG). Since both pulses originated from the same ML source, the generated mid-IR frequency comb is inherently fceo-free and can be used in laser-based gas sensors requiring stable carrier-envelope offset. The source is built entirely from PM single-mode fibers.
关键词： mid-IR,optical frequency comb,laser spectroscopy,fCEO-free,gas detection
更新于2025-09-16 10:30:52
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[IEEE 2019 Joint Conference of the IEEE International Frequency Control Symposium anEuropean Frequency and Time Forum (EFTF/IFC) - Orlando, FL, USA (2019.4.14-2019.4.18)] 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC) - All Polarization-Maintaining Fiber Laser for Femtosecond Pulse Generation at NTSC
摘要： We report on a robust mode-locked femtosecond fiber laser based on a nonlinear optical mirror with all polarization-maintaining fibers. Stable and self-starting operation is obtained by exploiting an integrated nonreciprocal device biases π/2 phase shift. In the single-pulse region, the laser directly generates output power of 3.15 mW at repetition rate of 87.7 MHz, corresponding to the pulse energy of 37 pJ. The center wavelength is 1585 nm with the spectral bandwidth of 25 nm at the maximum output power. We also evaluate the relative intensity noise of the mode-locking laser.
关键词： Femtosecond pulse,Optical frequency comb,Mode-locked fiber laser
更新于2025-09-16 10:30:52
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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) - Analysis of Optical Frequency Comb Generation in Gain-Switched Semiconductor Lasers
摘要： An Optical Frequency Comb (OFC) Generator is a laser source emitting an equally spaced group of optical tones. These types of optical sources have found application in different fields, such as spectroscopy [1] and optical communications [2]. Among the three main techniques for generating OFCs from semiconductor lasers, namely gain switching, electro-optic modulation and mode-locking, gain switching (GS) has attracted attention due to the simple selection of the repetition frequency and its easy implementation and low cost. We present here an exhaustive and systematic comparative analysis of the OFC generation using GS in semiconductor lasers. We have used a theoretical model, based on three stochastic differential equations that include non-linear saturation and Langevin noises, in order to simulate the experimental results. The experimental and simulated response has been studied in order to identify the main physical processes involved in the generation of GS OFC. An experimental characterization, based on RIN spectra measurements [5], was used to extract the parameters of the model. The OFC generator consists on a Discrete Mode Laser (DML), which is driven in GS operation using a bias current and a sinusoidal signal. High-resolution spectra were measured with a Brillouin Optical Spectrum Analyzer (BOSA).
关键词： Optical Frequency Comb,Spectroscopy,Optical Communications,Semiconductor Lasers,Gain Switching
更新于2025-09-12 10:27:22