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Sub-picosecond Event Timing: Novel Principle and New Technologies

This presentation discusses a novel timing principle for sub-picosecond event timing and the new technologies used in its implementation. It covers the design and construction of the first device, as well as the timing results in terms of jitter, linearity, and stability. The presentation also includes the first field test results and future vision for all optical event timing.

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Sub-picosecond Event Timing: Novel Principle and New Technologies

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  1. Progress in sub-picosecond event timing Ivan Prochazka* , Petr Panek presented at 16th International Workshop on Laser Ranging Poznan, Poland, October 13-17, 2008 * Czech Technical University in Prague Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

  2. Outline • Novel timing principle of sub-ps event timing • New technologies in electronics(SiGe ultrafast logic, “no ground”, SAW filters,..) • First device design and construction • Timing results : jitter, linearity, stability • First field test results I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  3. New timing principle theory by Petr Panek US Patent, 2005 • Time measurement is carried out in a FREQUENCY DOMAIN • The time-interpolation by the SAW filter • The SAW filter output synchronously sampled & digitized • Time / epoch is computed using the reverse FFT I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  4. New technologies employed • Ultrafast SiGe 10 GHz logic 35 ps slopes 50 Ohms lines matched drift ~ 0.5 ps / K • logical gain 1 high costs, limited availability PCB design, soldering problems • SAW filters used as time interpolators • 200 MHz Module, J.Kolbl and P.Sperber,Deggendorf, 2005 extreme spectral purity • Circuit design complementary signals only = > “NO GROUND” maximum design symetry ~ 10 ps delay matched cables I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  5. First sample construction Power supply SAW filter Exciter Sampler & A/Ddata interface Interpolator based on SAW filter I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  6. Device operational test – full configuration I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  7. Timing jitter - cable delay test Jitter per channel ~ 920 fs, normal distribution Review of Scientific Instruments, 78,1 (2007) I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  8. Timing linearity - the worst case phase 21st harmonics Amplitude 0.7 ps Reproducible, may be SW modeledjust 2 parameters fit (amplitude, phase) I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  9. Timing linearity – dependence on Tb-Ta phase Mean 0.42 ps for 2 channels worst case No sw corrections best case I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  10. Temperature drift (Tb-Ta), channel to channel Drift -8.6 fs / hour Ambient temperature stable +/- 0.5 C 3 hours / screen I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  11. Temperature drift (Tb-Ta), channel to channel 1 ps / screen < +/- 80 fs / hour I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  12. theoretical Tdev test 25 Hz repetition rate < +/- 80 fs / hour 25 fs I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  13. Epoch timing device • Epoch timing system, Two independent channels • Inputs NIM 2 x clock 200MHz • Jitter 0.9 ps / ch • Non-linearity < 0.2 ps • Stability < +/- 0.1 ps • Power < 15 Watts • Interface USB 1 • Dead time 10 us • Repetition rate 2.5 kHz CW I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  14. SLR tests in Graz, 4.3 km ground target Graz ETDassault 8.0 ps jitter 7.1 ps jitter Normal distribution (!!) New PET The difference corresponds to 2.5 ps versus 0.9 ps for Dassault and NPET timing jitters I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  15. Conclusion • Sub – picosecond event timing device is existing • “plug and play“ device • Novel timing principle was verified for the first timeNew technologies appreciated • Extreme stability and linearity of the order of ~ 100 fs • Self - calibrating no adjustment or calibration needed ever • Applications: basic metrology, laser time transfer next generation SLR …(?).. I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

  16. Future vision ALL OPTICAL EVENT TIMING Ulrich Schreiber, Ivan Prochazka, Petr Panek • Optical detectors are incorporated into the Exciter • The “laser comb” optical clock used as a reference • NO cables involved for critical signals ! • All the technology is available • fs stability and reproducibility 10-15 is achievable I.Prochazka, P.Panek, 16th Worksho on Laser Ranging, Poznan, Poland, Oct. 2008

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