Optical Isolators

Optical isolators of Fibrain Directivity family are passive, 2-port optical devices that allow for transmission of light only in one direction. Standard Fibrain isolators are insensitive to polarization. Optical isolators are used to reduce the amount of reflected and backscattered optical power propagating in the link, securing the receiver from damage and potential instabilities. The isolators are available in single stage and dual stage versions and in versions optimized for 1310, 1490, 1550, and 1590 nm windows. They are delivered with a report containing attenuation and isolation values in the operation bandwidth. A wide range of fiber connectors is available.

  • One-step and two-step (with increased isolation) versions 
  • 1310, 1490, 1550, 1590 nm operating windows, others possible
  • Insensitive to polarization
  • Small dimensions - 5.5x35 mm pipe housing
  • Other housing versions available
  • Low insertion loss
  • Very good reflection parameters
  • High thermal stability
  • CATV networks
  • Optical amplifiers
  • Measuring equipment
  • Telecommunication networks
Technical Data
Parameter One-step isolator Two-step isolator
Central wavelength 1310 or 1550* nm
Operation band Λc  ± 15 nm

Λc  ± 30 nm

IL ≤ 0.5 dB ≤ 0.7 dB
Directional isolation ≥ 30 dB ≥ 45 dB
RL ≥ 55 dB
PDL  ≤ 0.1dB
Max. optical power 500 mW
PMD < 0.1 ps
Temp. of operation from – 50C to + 750C
Temp. of storage from – 400C to + 850C

* Other operation windows available upon request.

Notice: Parameters listed in the table refer to components without connector terminations.


Optical circulators with output fibers with 250/900 µm coating have a 5.5x50 mm pipe casing with a serial naumber printed on the pipe with an indicated direction of transmission.





Additional possibilities:

90x20x10 mm black box housings for isolators with output fibers in 0.9/2.0/3.0 mm coating

assembly in LGX modules, 19’’ panels, etc.