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Ultra-high-resolution spectroscopy enables to test modern theories of fundamental physics with molecules as for instance the non conservation of parity [1] or the stability of the electron-to-proton mass ratio [2]. However many of these tests rely on the availability of ultra-stable and accurate laser sources emitting in the mid-infrared (MIR) where molecules exhibit rovibrational transitions. It...
We present here a new approach consisting in using part of an optical telecommunications network carrying simultaneously data traffic. Our 108 km comprises 86 km of dedicated fibre and 22 km of fibre from the French national telecommunications network for technology, education and research (RENATER). The link is a loop with both ends located in Observatoire de Paris to characterize the link stability...
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...
We report a physical-layer study of an optical fiber network for the multiplexing of sensors that can regain service after damage to its fibers. It is a symmetrical dual-fiber bus that uses ldquodedicated-linerdquo or ldquodedicated-pathrdquo protection switching in response to a failure. Amplification is normally needed when serving more than ~ 10 sensors, even when the network's directional couplers...
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