Re-Circulating Fiber-Loop Control

At a glance

Quick and cost efficient system evaluation


  • Cost efficient evaluation of optical long haul transmission systems
  • Quick setup of different link configurations
  • Arbitrary link length possible
  • Twin loop equipment for increasing the flexibility of link design
  • 2 free configurable loop sections
  • Bit rate and modulation format transparent
  • Reduction of required system components
  • Adaption to user requirements

Applications for Components

  • Test of optical components
  • Investigation of new fibre types
  • Characterisation of optical subsystems
  • Measurement of cascading effects

Applications for Systems

  • Evaluation of Submarine, Core and Metro systems
  • Study of new modulation formats
  • Investigation of dispersion maps
  • Investigation of node architectures
  • Long term stability tests


  • Insertion loss: < 9 dB
  • Polarisation dependent loss: < 0.2 dB
  • Wavelength range: C-Band (other ranges on request)
  • Rise time: 100 ns maximum
  • Time resolution: 250 ps
  • CW extinction ratio: 55 dB
  • Fiber connectors: E2000/APC (8°), other on request
  • RF connectors: BNC (50 ?)
  • Remote control: USB, Ethernet, GPIB or RS232
  • Freq. shift due to AOM (+35MHz or -35MHz)