Recirculating Loop System


To simulate and test long distance fiber optic communication lines, Brimrose has developed a fiber-coupled AO modulation system. The recirculating loop system consists of two fiber-coupled AO modulators/switches and a corresponding RF driver.

One of the AO modulators/switches is placed outside the loop to define the loading time and the second AOM is placed inside the loop to define the recirculating time or distance of the pulse transmission.


  • Low Insertion Loss
  • No O-rings
  • Rack-mount Enclosure
  • High Extinction Ratio
  • No Frequency Shift
  • Inside Loop Recirculating Switch
  • Outside Loop Loading Switch
  • Custom Configurations Available


  • Simulating and Testing of Long Distance Fiber Optic Communication Lines
  • OEM Designs

Brimrose Fiber Coupled Acousto-Optic Devices


  • Frequency Ranges : as low as 40 MHz to 1GHz
  • Low Insertion Losses (~2-3 dB)
  • Fast Switching Speed < 10 nsec
  • High Extinction Ratio >50 dB or better upon request
  • Optical Power Handling – up to 5W CW
  • SM – PM Fibers – FC/APC Connectors