Optical delay stabilization system ODSS


Optical delay stabilization system – ODSS



The optical delay stabilization system (ODSS) stabilizes a delay of the optical-path length between two user points connected via a single single-mode optical fiber. User signals are transferred over an independent bidirectional CWDM channels. The aforementioned device can be used in applications, where a constant delay of a signal is needed.

For a stabilization of an optical-path length an internal heated/cooled fiber spool is used. When a faster compensation response is needed, an additional piezo-controlled fiber stretcher can be installed inside the device. Optical channels may be equipped with electro-optical and opto-electrical conversion modules, to transfer various signals, such as 1 PPS, RF signals or data.



  • Plug&Play point-to-point system
  • Optical-path delay stabilization
  • Test signal delay stability 0.15 fs/m/K (fiber length 3 km, measured by monitoring the frequency drift of the Opto-Electronic Oscillator, February 2017)
  • Multichannel – 4 user channels (@ 1290 nm, 1310 nm, 1350 nm and 1370 nm)
  • Bidirectional channels
  • Build-in telemetry
  • USB, ETH interface



  • Precise delay or distance measurement
  • Custom selection of a user wavelength



  • 1PPS transfer
  • up to analog 2 GHz transfer (suitable for 1 M/10 M signal)
  • up to analog 10 GHz transfer (suitable for 1 M/10 M as well as higher frequency signals)
  • bidirectional all-optical transfer
  • data (ethernet or other)



  • Clock and timing distribution
  • Stable RF-over-optics link
  • Stable antenna-to-facility link
  • Constant delay simulation (Constant delay line)
  • Optical-path drift measurement
  • Stabilization of an Opto-Electronic Oscillator



  • Brochure (SLO version) [PDF]
  • Brochure (ENG version) [PDF]
  • Demonstration setup as shown at PTTI 2013 (ENG version) [PDF]


If control and equilisation of delay of several links is needed, two extra devices are added:
ODSS-CTRL (control unit) compares all link delays and sends corrections to the ODSS-DELAY units, which compensates for absolute delay difference between links (static). The setup may be seen on the following figure. This two units are currently under development.