Neptec’s optical fiber isolators permit light to transmit only in one direction. Neptec’s isolators are used to protect sensitive optical components from unwanted feedback and signals. Without isolators, sensitive and expensive equipment like optical cavities could easily be damaged by reflection signals.

Neptec offers a wide range of customization options including power handling, polarization-dependent and polarization-independent models for wavelengths ranging from 780 to 1550 nm. If the standard optical fiber isolator below does not fit your application, we would be glad to review your specifications and quote a custom isolator for you.

Product Information

Key Features

• Low Insertion Loss
• Low Polarization Dependent Loss (PDL)
• High Isolation
• Small Form Factor
• PM and Non-PM are available
• Customized Configurations For Any Application


• Optical Fiber Amplifiers
• WDM and DWDM Systems
• High Power Fiber Laser
• CATV Systems


Parameter Unit Typical Notes
Operating Signal Wavelength nm 1310 or 1550 ±15
Minimum Isolation dB ≥30
Insertion Loss dB ≤0.30
Polarization Dependent Loss dB ≤0.05
PMD ps ≤0.25
Return Loss dB ≥60/55 (in/out)

Electrical and Environmental Characteristics

Parameter Unit Typical Notes
Operating Temperature Range ◦C (-5) to 70
Storage Temperature Range ◦C (-40) to 85