Polarization maintaining (PM) fiber optical collimator (450nm 460nm 630nm 632nm 650nm 780nm 850nm 980nm 1064nm 1310nm 1550nm 2000nm) is used to launch a beam of light from an optical fiber into free space and then to capture that light and refocus it into the same or another fiber. By using Panda polarization maintaining fiber (PMF), the PM fiber collimator can maintain a well-defined state of polarization (SOP) of the light signals. They meet most demands with good performance over a wide temperature range. LFIBER’s PM fiber optical collimators feature epoxy-free in the light path, low loss, high extinction ratio, high reliability qualification complying with GR-1221-Core standard. Related Products

What Is a Polarization Maintaining (PM) Fiber Optical Collimator

In fiber optical systems, the PM fiber collimators (450 nm, 460 nm, 630 nm, 632 nm, 650 nm, 780 nm, 850 nm, 980 nm, 1064 nm, 1310 nm, 1550 nm, 2000 nm) are used to either couple light from free space into an optical fiber or collimating light from a fiber to form a “collimated” optical beam. At the same time, The PM fiber collimator can fully preserve the polarization of light. Most in-line PM fiber optical modules consist of two face-to-face PM fiber collimators and of functional elements, such as filters, polarizers, or crystals, inserted in the free space between them.

Structure of a PM Fiber Collimator (Polarization Maintaining Fiber Optical Collimators)

Figure 1 shows a structure of the actual Polarization Maintaining (PM) fiber collimator. One or two optical fibers are fixed into a glass capillary (ferrule) with epoxy adhesive, and its end facet is polished with 6 to 12° angles. The small gap between optical fiber and lens remains, with no epoxy in the optical path after all the parts are fixed with epoxy. 
Polarization Maintaining (PM) Fiber Optical Collimator 780nm 650nm 632nm 630nm 460nm 450nm 2000nm 1550nm 1310nm 1064nm 980nm 850nm

Figure 1     A structure of a Polarization Maintaining (PM) optical fiber collimator.

In most cases, the basic structure of a PM fiber collimator (450nm 460nm 630nm 632nm 650nm 780nm 850nm 980nm 1064nm 1310nm 1550nm 2000nm) consists of at least a lens and an optical fiber. Lenses which can be used include fiber lenses, ball lenses, aspherical lenses, spherical singlets and doublets, GRIN (Graded Index) lenses, microscope objectives, or cylindrical lenses. Currently, most fiber collimators use Graded-Index, or GRIN, lenses, and shaped lenses, often called C-lenses. A C-lens is a miniature lens with similar performance as a GRIN lens but slightly better insertion loss, lower cost, and longer working distance compared to GRIN-lens optical collimators, so that C-lens optical collimators are more popular for micro-optic devices.
PM Fiber Collimator 450nm 460nm 630nm 632nm 650nm 780nm 850nm 980nm 1064nm 1310nm 1550nm 2000nm Polarization Maintaining Fiber Optical Collimators

Light from a fiber is coupled into another fiber by means of a PM fiber collimator pair, pointing at each other.



Polarization Maintaining (PM) Fiber Optical Collimator

PM Fiber Collimator Polarization Maintaining Fiber-Optic Collimators High Extinction Ratio
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  • Low Insertion Loss
  • High Extinction Ratio (ER)
  • High Return Loss
  • GR-1221-Core Compliant


  • Fiber-Optic Collimation and Focusing
  • Essential Elements for PM Optical Devices
  • Optical Communications Systems
  • Other PM Fiber Optical Applications


Specifications of the PM Fiber Collimator
Center Wavelength(nm)450, 460630, 632, 65078085098010641310, 15502000
Operating Wavelength Range (nm)±20±20±20±20±20±30±50±30
Insertion Loss (dB)≤1.0≤0.8≤0.4≤0.35≤0.3≤0.3≤0.25≤0.5
Extinction Ratio (dB)≥20, ≥25, ≥30, ≥35
Working Distance (mm)5, 10, 20; Others upon request
Fiber TypePanda PM Fibers
Return Loss (dB) ≥55 (UPC), ≥60 (APC)
Operating Temperature (°C)-5 to +70; Others upon request
Storage Temperature (°C)-40 to +85
Package Dimensions (mm)Φ3.20*L10 (metal housing, Φ1.8mm lens)
Φ2.78*L9 (glass housing, Φ1.8mm lens)
Φ1.80*L7 (metal housing, Φ1.0mm lens)
Φ1.40*L7 (glass housing, Φ1.0mm lens)


  • For polarization maintaining (PM) fiber collimator with a connector, IL is 0.3 dB higher, RL is 5.0 dB lower, and ER will be 2.0 dB lower.
  • Insertion loss is measured through a PM fiber collimator pair.
  • Unless otherwise specified, the slow axis of the PM fiber is aligned with the key of the fiber connector.
  • Please specify the operating wavelength, working distance, extinction ratio requirements, housing type (package dimensions), fiber length, connector type, etc. in the orders. (See the ordering information section.)
  • This PM fiber collimator (high extinction ratio) is customizable, and the above specifications are subject to change without notice.


Package Dimensions of the PM Fiber Collimator


PM Fiber Collimator 450nm 460nm 630nm 632nm 650nm 780nm 850nm 980nm 1064nm 1310nm 1550nm 2000nm


PM Fiber Collimator Polarization Maintaining Fiber Optical Collimators 2000nm 460nm 630nm 450nm 632nm 650nm 780nm 850nm 980nm 1064nm 1310nm 1550nm


Polarization Maintaining PM Fiber Collimator High Extinction Ratio Fiber-Optic Collimation and Focusing Assemblies


High Extinction Ratio PM Fiber Optic Collimator Polarization Maintaining Optical Collimators


Ordering Information for PM Fiber Collimator
WavelengthWorking DistanceExtinction RatioPackage DimensionsFiber PigtailFiber LengthConnector
450 nm5 mm≥20Φ3.20*L10 mm (metal)Φ250μm bare fiber
(without jacket)
0.5 mNone
460 nm10 mm≥25Φ2.78*L9 mm (glass)Φ900μm loose tube0.8 mFC/UPC
630 nm20 mm≥30Φ1.80*L7 mm (metal)Φ2.0mm cable1.0 mFC/APC
632 nmOthers≥35Φ1.40*L7 mm (glass)1.5 mSC/UPC
650 nm2.0 mSC/APC
780 nmOthersLC/UPC
850 nmLC/APC
980 nmOthers
1064 nm
1310 nm
1550 nm
2000 nm