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National Repository of Grey Literature 1 records found  Search took 0.01 seconds. 
Digital signal synthesizer for compensating Doppler effect in fiber-optic lines
 Hucl, Václav ; Čížek, Martin ; Pham, Minh Tuan ; Pravdová, Lenka ; Číp, Ondřej
If a highly stable laser standard is distributed over a long fiber-optic line the stability of optical frequency of the laser at the far end is usually degraded due to external influences on the optical fiber. Thermal dilatation or vibrations of the fiber result in Doppler shifts changing the optical frequency of the laser light. A setup based on an unbalanced Mach-Zehnder or a Michelson interferometer with the optical line acting as a measuring arm can be used for detecting Doppler frequency shifts. Once we are able to detect the shifts we can compensate them by detuning the optical frequency of the transmitted laser light in a closed-loop. Our paper presents the method of detecting the frequency shifts in the fiber-optic line together with a digital electronic controller. The controller is based on a digital signal processor and a DDS chip for generating the radiofrequency signal driving the acousto-optic modulator in order to detune the transmitted laser light.
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