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Microwave photonic solutions of frequency measurement have advantages in broad frequency coverage, but achieving high-resolution measurement remains a challenge. Those schemes based on optical frequency combs could achieve high-resolution measurement over a broad frequency range. Here, a dead-band-free, high-resolution microwave frequency measurement scheme based on undersampling the microwave signal...
Asynchronous-optical-sampling THz-TDS using a free-running, dual-wavelength mode-locked fiber laser is demonstrated for highly cost-effective and compact THz spectrometer while maintaining its high spectroscopic performance.
We demonstrate a wideband tunable, ultrafast fiber laser mode-locked by using a solution deposited and encapsulated black phosphorus (BP) saturable absorber. Stable, picosecond pulses, tunable from 1535 nm to 1565 nm are generated.
By leveraging the polarization interference filtering and the gain profile tilting based on polarization-dependent loss tuning, ultrashort pulses at up to four wavelengths are generated covering both 1530 and 1560 windows of the C-band.
We demonstrate an all-normal dispersion ytterbium-doped fiber laser Q-switched by using a solution processed few-layer tungsten disulfide (WS2)-polymer composite saturable absorber at 1030 nm.
Two orthogonally polarized soliton pulse trains with different repetition rates are stably generated from a passively mode-locked fiber ring cavity with a section of polarization maintaining fiber. The frequency difference can be varied as well.
Extremely long states of bound solitons consisting of up to eleven solitons have been generated from a carbon nanotube passively mode-locked fiber laser with an intracavity pulse shaper.
We report the observation of bound states formed by an induced vector soliton and a scalar soliton, the first reported case involving a vector soliton, generated from a weakly birefringent, carbon-nanotube mode-locked fiber laser.
A high-resolution laser ranging scheme using one dual-wavelength femtosecond fiber laser, which generates a dual-comb with their frequency difference inherently locked by the intracavity dispersion, is experimentally demonstrated for the first time.
A holey fiber design with a high index nanostructure that can achieve an effective mode area not in excess of 0.3 mum2 and a flat dispersion at the 1.55 mum band is proposed and studied.
An ultra-wideband single-mode single-polarization photonic crystal fiber design is proposed. Simulations indicate it has a 1540 nm SMSP range with the confinement loss being ≪ 0.25 dB/km and an effective area of 2.2 µm2. Meanwhile, the flat, near-zero group velocity dispersion can also be achieved at ∼800 nm.
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