Fiberer provide Polarization Maintaining Isolator ,and it is good quality and stability.

Features Applications High Isolation Low Insertion Loss High Return Loss High Extinction Ratio Optical Path Epoxy Free Fiberoptic Amplifiers CATV Fiberoptic Links Fiberoptic Systems Testing Fiberoptic LAN Systems Telecommunications

Performance Specifications   Parameters Unit Values Stage   Single Stage Dual Stage Grade   Grade P Grade A Grade P Grade A Center Wavelength (λc) nm 1310, 1480 or 1550 Operating Wavelength Range nm ±20 Typ. Peak Isolation dB 42 40 58 55 Min. Isolation at 23℃ dB 28 26 48 45 Typ. Insertion Loss at 23℃ dB 0.4 0.5 0.5 0.6 Max. Insertion Loss at -5℃-70℃ dB 0.55 0.65 0.65 0.8 Min. Return Loss (Input/Output) dB 55 55 55 55 Min. Extinction Ratio(only for B tyep) dB 20 18 20 18 Min. Extinction Ratio(only for F type) dB 25 23 25 23 Max. Optical Power (CW) mW 500 Max. Tensile Load N 5 Fiber Type   PM Panda Fiber Operating Temperature ℃ -5 to +70 Storage Temperature ℃ -40 to +85 *Above specifications are for device without connector. *For devices with connectors, IL will be 0.3dB higher, RL will be 5dB lower and ER will be 2dB lower. *The PM fiber and the connector key are aligned to the slow axis. Size Ordering Information   Ordering Information PMI-①①-②-③-④-⑤⑤-⑥⑥-⑦ ①①: Wavelength ④: Axis Alignment ⑥⑥: Fiber Jacket on Port 1 & 2  31 - 1310nm  F - Fast Axis Blocked  B - 250um Fiber  48 - 1480nm  B - Both Axis Working  D - 400um Fiber  55 - 1550nm    L - 900um Loose Tube  SS - Specify ⑤⑤: Connector Type on Port 1 & 2  S - Specify    1 - FC/UPC   ②: Grade  2 - FC/APC ⑦: Fiber Length  P - Premium Grade  3 - SC/UPC  0.8 - 0.8m  A - A Grade  4 - SC/APC  S - Specify    N - None   ③: Stage  S - Specify   S - Single Stage     D - Dual Stage