optical Isolator can block lection and backscattering in the reverse direction at any polarization sate.they have low polarization mode dispersion(PMD).The are based on the micro-optics package technology and featured with the best tability and reliability. the products are Telcordia GR-1221-CORE qualified. Features: High Isolation Low Insertion Loss High Return Loss High Power Handling Applications : Fiberoptic Amplifiers Fiber Laser Lab Research Instrumentation we have various of mode,such as PM 1550nm High Power Isolator,PM 850nm High Power Isolator,PM 1064nm High Power Isolator(1W),PM 1064nm High Power Isolator(1W),1550/1590 High Power Isolator,1310 and 1550 nm Single Mode Polarization Insensitive Isolator,C+L Band Optical Polarization Insensitive Isolator,Hybrid Isolator: Tap+980/1550 WDM +Isolator. if you want to know more details ,please contact me .i am looking forward to your inquiry.