The high extinction ratio optical isolator (polarization-maintaining fiber optic isolators) is a fiber-coupled optical component which lets light pass through in one direction, but block it in the opposite direction. At the same time, by using PM Panda fibers it’s capable of maintaining a well-defined state of polarization (SOP) of the light with a high extinction ratio better than 20dB, 28dB, 30dB, or higher. This high extinction ratio optical isolator (PM isolator) is a good choice in many PM optical systems, since back-reflected light often have deleterious effects on the operating conditions of optical devices. Related Products ↓

High Extinction Ratio Optical Isolator (PM Isolator)

Because of the development of PM optical systems, high extinction ratio optical isolator (polarization-maintaining fiber optic Isolators) has become a very useful component, and normally it’s sealed in a compact and ruggedized pigtailed package.
 
Unless otherwise specified, this fiber-coupled high extinction ratio optical isolator (PM isolator) can be operating on both slow-axis and fast-axis linear polarizations; Transmitting the polarization state on slow axis in one direction and blocking the orthogonal state on fast axis in both directions is available on request.

 

High Extinction Ratio Optical Isolator (1310/1480/1550 nm)

 

High Extinction Ratio Optical Isolator PM Fiber Isolator
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FEATURES OF HIGH EXTINCTION RATIO OPTICAL ISOLATOR

  • High Extinction Ratio
  • Low Insertion Loss
  • High Isolation and Return Loss
  • High Reliability and Stability

APPLICATIONS OF HIGH EXTINCTION RATIO OPTICAL ISOLATOR

  • Optical Communication Systems
  • Fiber Laser
  • PM Fiber Optic Instrument
  • Optical Fiber Sensor

 

Specifications of High Extinction Ratio Optical Isolator (PM Isolators)
Center Wavelength (nm)1310, 1480, 1550
Operating Wavelength Range (nm)±20
StageSingle-stageDual-stage
Peak Isolation @ 23 ℃ (dB)4258
Isolation @ 23 ℃ (dB)≥28≥48
Typ. Insertion Loss @ 23°C (dB)0.40.5
Insertion Loss @ -5 ~ +70 °C (dB)≤0.55≤0.65
Extinction Ratio @ 23 ℃ (only for both axis working) (dB)≥20 (default), ≥28≥20 (default), ≥28
Extinction Ratio @ 23 ℃ (only for fast axis blocked) (dB)≥25 (default), ≥30≥25 (default), ≥30
Return Loss (dB)≥50
Power Handling (mW)≤300 　
Fiber TypePM panda fiber
Package Dimensions (mm)Φ5.5×35
Operating Temperature (°C)-5 to +70
Storage Temperature (°C)-40 to +85

Notes:

  • The high extinction ratio optical isolator (PM Isolator) is customizable, and the above specifications are subject to change without notice.
  • For device with connectors, IL is 0.3dB higher, RL is 5.0dB lower, ER is 2.0dB lower.
  • Unless otherwise specified, the slow axis of the fiber is aligned with the key of the PM fiber connector.
  • Slow axis working and fast axis blocked as standard, while operating on both the slow and fast axis available on request.
  • Bare fiber should not support the weight of the connector. So that if you need any connectors, it’s better to choose the 900μm loose tube jacket instead of the 250μm bare fiber.
  • For CW high-power optical interconnection, we recommend fusion splice without connectors.
  • For product customization or special requirements, please contact Lfiber’s sales department for availability.

 

Package Dimensions

 

High Extinction Ratio PM Isolator Polarization-Maintaining Optical Isolators

 

 

 

Ordering Information for High Extinction Ratio Optical Isolator (PM Isolators)
Center WavelengthStageAxis AlignmentFiber TypePigtail TypeFiber LengthConnector
1310nmSingle-stageSlow axis working and fast axis blockedPM1310250μm bare fiber0.5 MeterNone
1480nmDual-stageFast axis working and slow axis blockedPM1550900μm loose tube0.8 MeterFC/UPC
1550nmBoth axis workingOthers1.0 MeterFC/APC
1.5 MeterSC/UPC
SpecifiedSC/APC
LC/UPC
LC/APC
Others

 

About Axis Alignment of the PM Fiber Optical Isolator (High Extinction Ratio):

  • “Slow axis working and fast axis blocked” means that light on just the slow axis is transmitted and the fast axis light is blocked in the forward direction; Both the slow and fast axis light are blocked on the backward direction.
  • “Both axis working” means that both the slow and fast axis light are transmitted in the forward direction, both the slow and fast axis light are blocked in the backward direction.