All-fibre photonic signal generator for attosecond timing and ultralow-noise microwave

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High-impact frequency comb applications that are critically dependent on precise pulse timing (i.e., repetition rate) have recently emerged and include the synchronization of X-ray free-electron lasers, photonic analogue-to-digital conversion and photonic radar systems. These applications have used attosecond-level timing jitter of free-running mode-locked lasers on a fast time scale within similar to 100 mu s. Maintaining attosecond-level absolute jitter over a significantly longer time scale can dramatically improve many high-precision comb applications. To date, ultrahigh quality-factor (Q) optical resonators have been used to achieve the highest-level repetition-rate stabilization of mode-locked lasers. However, ultrahigh-Q optical-resonator-based methods are often fragile, alignment sensitive and complex, which limits their widespread use. Here we demonstrate a fibre-delay line-based repetition-rate stabilization method that enables the all-fibre photonic generation of optical pulse trains with 980-as (20-fs) absolute r.m.s. timing jitter accumulated over 0.01s (1s). This simple approach is based on standard off-the-shelf fibre components and can therefore be readily used in various comb applications that require ultra-stable microwave frequency and attosecond optical timing.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2015-11
Language
English
Article Type
Article
Keywords

FEMTOSECOND LASERS; OPTICAL-FIBER; PHASE NOISE; DELAY-LINE; FREQUENCY; JITTER; STABILIZATION; SYNCHRONIZATION

Citation

SCIENTIFIC REPORTS, v.5

ISSN
2045-2322
DOI
10.1038/srep16250
URI
http://hdl.handle.net/10203/205174
Appears in Collection
ME-Journal Papers(저널논문)
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