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We present a hybrid fiber link to realize the local two-way optical frequency comparison with self-synchronization. It enables us to detect round-trip fiber noise and one-way fiber noise, and estimate the residuals. Moreover, we can check, to the best of our knowledge for the first time, the reciprocity of the accumulated noise forth and back over a bi-directional fiber, and also evaluate the noise...
The transfer of ultra-stable frequencies between distant laboratories is a fundamental issue for a wide range of high-sensitivity experiments in advanced metrology and fundamental physics. Since a few years, several experiments of optical frequency transfer were reported over dedicated fiber, with a record distance of 920 km [1] recently demonstrated in Germany. The challenge is now to build a wide...
We transfer the frequency of an ultra-stable laser over a 470-km optical link comprising 400 km of public telecommunication fiber network, simultaneously carrying data traffic. A dense wavelength division multiplexing scheme is used. The ultrastable signal is inserted in and extracted from the communication network using bidirectional optical add-drop multiplexers. The link passes through two important...
We transfer the frequency of an ultra-stable laser over a cascaded optical link comprising two compensated links of 150 km and a repeater station. Each link passes through two important nodes of the telecommunication network and includes 114 km of Internet fiber simultaneously carrying data traffic, through a dense wavelength division multiplexing scheme. The metrological signal is inserted in and...
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...
In this paper we present an ultra-stable fiber optical link which allows transferring radio frequency reference signal between two research laboratories. The link is composed of two 43 km twin optical fibers of the urban telecommunications network that connect the LPL to the LNE-SYRTE. The phase/frequency stability of the transferred signal is degraded by mechanical vibrations and temperature variations...
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