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We present the most recent progress in the design and implementation of sub-femtosecond timing jitter mode-locked fiber lasers and their applications in ultralow-noise microwave signal generation, synchronization and remote transfer.
We experimentally identify that narrow bandpass-filtering can significantly reduce the timing jitter in normal-dispersion fiber lasers. Both the split-step method-based jitter simulation and the modified Namiki-Haus analytic model agree well with the measured jitter spectrum.
I introduce novel attosecond-resolution measurement methods of timing jitter spectra in mode-locked lasers. Based on the accurate measurements, the jitter of various types of fiber lasers could be optimized to the unprecedented sub-femtosecond regime.
We demonstrate a remote microwave/RF transfer technique based on frequency comb. We use high resolution and low drift fiber-loop optical-microwave phase detectors (FLOM-PD) for fiber link stabilization and synchronization between a mode-locked laser and microwave sources. The demonstrated fractional frequency instability between 2.856-GHz oscillators separated by a 2.3-km fiber link is 7.6 × 10−18...
We demonstrate a new time-of-flight stabilization technique based on all-fiber-loop optical-microwave phase detectors. The demonstrated relative frequency instability between 2.856-GHz signals separated by a 2.3-km fiber link is 6.5×10−19 at 82500-s averaging time.
We searched for the minimal timing jitter condition in an all-fiber, soliton, CNT-mode-locked Er-laser by dispersion engineering. The measured lowest timing jitter is 490-attosecond [10-kHz to 39.4-MHz] at −0.02 ps2 intra-cavity dispersion.
We demonstrate 18-attosecond timing jitter [10 kHz–94 MHz] pulse trains from 188MHz mode-locked Yb-fiber lasers. This is the lowest timing jitter from free-running fiber lasers, comparable to the performance of lowest-jitter Ti:sapphire lasers.
We demonstrate optical pulse trains with sub-100-attosecond high-frequency timing jitter from passively mode-locked, stretched-pulse fiber lasers by operating the lasers at the close-to-zero net cavity dispersion.
We demonstrate quantum limited timing jitter performance of ultrafast fiber lasers and long distance (320 meter) synchronization of similar lasers over 168 hours with 5 femtosecons rms precision, at the quantum noise limit.
The distribution of an ultrafast optical pulse train over multiple fiber links with long-term stable timing precision within 2 femtoseconds rms is accomplished by integrating a polarization maintaining output with 300 meter long fiber links.
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