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We report the research progress of an erbium-fiber-based optical frequency comb with repetition rate 232 MHz. Its repetition rate is stabilized to a continuous wave laser via an intra-cavity electro-optic modulator and a piezo-transducer, yielding an in-loop frequency instability about 2.1×10−16 @ 1s. The carrier envelope offset (CEO) frequency with a signal-to-noise ratio of 45 dB for 300 kHz resolution...
Femtosecond mode-locked lasers are key parts of optical frequency combs which allows a directly link from microwave frequency standards to optical frequencies. In this paper, we report on a 186 MHz mode-locked Erbium-doped fiber femtosecond laser developed for 9.2 GHz ultra-low-noise signal generation. This laser keeps mode-locked states within a large pump power dynamic range (from 300 mW to 1000...
We demonstrate a 10-GHz fiber-based photonic microwave generator with residual phase noise below −110 dBc/Hz for Fourier frequencies higher than 2-Hz. The noise floor is reduced to −156 dBc/Hz by using an optical mode-filtering cavity.
We transferred the frequency of an ultrastable laser over a 108-km-long urban fiber link comprising 22 km of an optical communication network fiber simultaneously carrying Internet data traffic. The metrological signal and the digital data signal were transferred over two different frequency channels in a dense wavelength-division multiplexing scheme. The metrological signal was inserted in and extracted...
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