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Synchronization of a 40 GHz quantum-dash mode-locked (ML) Fabry-Perot laser diode with optically injected pulse streams is experimentally studied. Injected signals consist of nonmodulated and modulated trains of 1.6 ps pulses at various repetition rates, ranging from 10 to 160 GHz and 10 to 160 Gbps, respectively. Subharmonic, fundamental, and harmonic synchronization of the ML laser allows retrieval of stable 40 GHz clock pulses featuring a width of 1.8 ps. Frequency components at 10 and 20 GHz do not create any amplitude modulation on the recovered 40 GHz clock pulses when injecting signals at 10 and 20 GHz/Gbps. In addition, external synchronization of the laser with pulse streams at 80 and 160 GHz/Gbps is sustained despite the absence of significant components at or below 40 GHz.
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http://dx.doi.org/10.1364/OL.36.001569 | DOI Listing |
A controllable frequency-hopping (FH) optoelectronic oscillator (OEO) based on active time-domain mode-locking (TDML) is proposed and experimentally demonstrated. In the proposed FH OEO, a dual-passband microwave photonic filter (MPF) based on phase-modulation-to-intensity-modulation (PM-IM) conversion is implemented using two laser diodes (LDs), a phase modulator, a micro-disk resonator, and a photodiode. Using two synchronized electrical control signals, the two LDs are intensity modulated to achieve the controllable two sub-passbands of the dual-passband MPF.
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March 2025
We report a parameter adjustable mid-infrared (MIR) ultra-short pulse-burst laser based on the difference frequency generation (DFG) within a periodically poled MgO:LiNbO crystal. A uniform pulse laser at 1.03 μm with a sub-GHz repetition rate was first modulated into parameter adjustable burst modes, which subsequently served as the pump seed for the DFG process.
View Article and Find Full Text PDFThe pursuit of real-time, high-resolution imaging at visible wavelength has long been hampered by the limitations of traditional laser sources. Existing visible ultrafast lasers often suffer from limited repetition rates, or complex pulse shaping requirements, hindering their applicability for advanced imaging techniques. This work introduces a novel ultrafast imaging technology using a 775 nm near visible Kerr frequency comb.
View Article and Find Full Text PDFWe demonstrate a 1550 nm external-cavity diode laser (ECDL) based on a high-Q miniaturized Fabry-Pérot (FP) cavity, achieving a wide mode-hop-free continuous frequency-tuning range, which holds significant application value in fields such as frequency-modulated continuous-wave (FMCW) ranging and radar. By minimizing the feedback loop length and employing a piezoelectric transducer (PZT) to scan the cavity length, the continuous frequency-tuning range exceeds 30 GHz at a repetition rate of 100 Hz, with frequency-tuning nonlinearities of 1.7% and 1.
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