Libera Sync

Libera Sync is used to transmit high-quality clock signals from a source, usually a Reference Master Oscillator, to numerous systems that need to be synchronized along the machine (e.g. LLRF stations). 

Product Description
Documentation
References

Libera Sync general description: 

The transmitter input signal is a continuous wave RF reference signal that modulates an optical carrier. The modulated signal is split into two parts and fed into the two optical links: a low-drift link and a low-jitter link (see the block scheme in the Figure below). The low-drift signal is partially reflected at the receiver and is used to perform phase drift compensations in the transmitter.  

At the receiver, the optical signals from both links are demodulated into the RF domain. The low-jitter signal is amplified, filtered and stabilized in amplitude and phase, using the low-drift signal. The resulting signal is used to provide two RF outputs and one monitoring output. 

Benefits:

  • Customized to the user frequency
  • High reliability achieved by using high-end electronic and optical components operating in optimal working points
  • Robust mechanical layout specifically designed to maintain a controlled environment inside the units
  • Fully automated start-up and tuning procedure
  • Once tuned it becomes a self-sustaining integral part of the machine
  • Remote control and/or local control and monitoring
  • Local data logging on the memory card
  • EPICS IOC

Data processing:

Transmitter

Receiver

 

Libera Sync technical specification:
Carrier frequency0.5 GHz 2.6 GHz - 3 GHz
Added jitter (integrated from 10 Hz to 10 MHz)< 150 fs RMS< 8 fs RMS
Long term drift (typical in 24 hours)< 250 fs peak-to-peak< 40 fs peak-to-peak
Long term drift (typical in 16 hours)< 20 fs peak-to-peak
Optical fiber drift compensation range500 ps500 ps
RF input1, SMA connector, 50 Ω1, SMA connector, 50 Ω
RF input power±15 dBm ± 1dBm± 15 dBm ±1dB
RF outputs2, SMA connectors, 50 Ω ; 1 monitor, SMA connector, 50 Ω2, SMA connectors, 50 Ω ; 1 monitor, SMA connector, 50 Ω
RF output powers+ 15 dBm ±0.5 dB; monitor output -10 dBm ± 2 dB + 15 dBm ±0.5 dB; monitor output -10 dBm ± 2 dB
Operating temperature range20 -28°C20 -28°C
Operating temperature stability±1°C±1°C
Operating relative humidity range0-80%0-80%
Operating relative humidity stability±5%±5%
DimensionsH: 2 U, W: 19" (rack mountable), D: 456 mmH: 2 U, W: 19" (rack mountable), D: 456 mm
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Influence of environment changes on Libera Sync 3 long-term stability (FEL 2015, Daejaon, S. Korea)
Test results of the Libera Sync 3 CW Reference Clock Transfer System (IPAC’14, Dresden, Germany)
Next Generation CW Reference Clock Transfer System with Femtosecond Stability (NA-PAC13, Pasadena, USA)

Libera Sync is used at the following labs:

  • BEPC II – Institute of High Energy-IHEP, China
  • CLARA – Daresbury Laboratory-STFC ASTeC, United Kingdom
  • PSI SLS, SwissFEL – Paul Schrerrer Institute-PSI, Switzerland
  • FERMI – Elettra Sincrotrone Trieste, Italy
  • LCLS – Stanford Linear Accelerator Center-SLAC, USA
  • NSRL2 – National Synchrotron Radiation Laboratory-NSRL, China
  • SKIF – Budker Institute of Nuclear Physics-SKIF, Russia
  • SSRF, SXFEL – Shanghai Synchrotron Radiation Facility-SINAP, China
  • TLS, TPS – National Synchrotron Radiation Research Center-NSRRC, Taiwan
  • VEGA – Extreme Light Infrastructure – Nuclear Physics- ELI-NP, Romania
  • XFEL – Pohang Accelerator Laboratory-PAL, South Korea

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