Collaboration between Deutsche Telekom AG (DTAG), AGH1 University of Science and Technology, and PTB Time & Frequency Dissemination SDH Bremen UTC(DTAG)

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Presentation transcript:

Collaboration between Deutsche Telekom AG (DTAG), AGH1 University of Science and Technology, and PTB Time & Frequency Dissemination SDH Bremen UTC(DTAG) Braunschweig UTC(PTB) 76.98 km 54.2 km 47.89 km 44.3 km Objectives: Enable time comparison between (German) UTC-labs using optical fiber: here: PTB-DTAG DTAG: feasibility study of installed DTAG-telecom fiber for time dissemination Dissemination of „traceable“ time UTC(x) Investigating and pushing the limits of Time Transfer over Fiber (TTOF) 1Akademia Gorniczo-Hutnicza im. Stanislawa Staszica w Krakowie (AGH)

Looped setup – source of signals and measurements in Braunschweig SPBA: single path bi-directional amplifier Additional tapping module in Bremen allows for signal extraction Sliwczynski, L.; Krehlik, P., "Multipoint joint time and frequency dissemination in delay-stabilized fiber optic links," in Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on , vol.62, no.3, pp.412-420, March 2015 10 MHz is measured with K&K counter (L-Mode) Counter resolution <200 fs @ 1s enhanced by dual mixer method 1 pps is measured with Time interval counter TIC resolution ≈10 ps @ 1s

Preliminary results

Preliminary results

Dual-Mixer Time Difference Methode with Harmonic Tracking Local site Time Interval TIC 4100 Remote site 1 PPS 1 PPS 10.000000 Hz 10.000000 Hz Synthesizer 10.250000 Hz 0dB LPF 1.9 MHz LPF 1.9 MHz N= 128 N= 128  N  N FXE Counter VCO VCO Ch1 Ch2 Ch3 Ch4 LPF LPF

Participants PTB: Dirk Piester Andreas Bauch Harald Schnatz With support from Harald Dietl Holger Seifert DTAG: Helmut Imlau Uwe Habighorst Marvin Barasi AGH: Łukasz Sliwczynski Przemysław Krehlik With support from Jacek Kolodziej