PMF/QPMF Polarization Maintaining Fibers

350-2200 nm; Core Diameter 2-20 µm; Cladding Diameter 125, 130, 250 µm; Mode Field Diameter 2.3-10.5 µm; Numerical Aperture 0.08-0.2; Polarization Crosstalk <-20, <-25, <-30 dB

OZ Optics offers a wide range of optical fibers suitable for many applications. PMF/QPMF polarization maintaining (PM) fibers come in a variety of fiber sizes, operating wavelengths, and fiber types, and can be assembled into patchcords or more complex fiber optic components to suit your needs. OZ Optics categorizes fibers based on fiber type, operating wavelengths, core/cladding size, jacket diameter, and numerical aperture (NA).

OZ Optics’ PMF/QPMF polarization maintaining (PM) fibers are a special variety of single mode (SM) fibers, designed to maintain the polarization properties of linearly polarized light sources, provided that the light is launched along either the slow or fast axes of the fiber. The most common method to do this is by adding two stress applying parts (SAP) on either side of the fiber core. OZ Optics’ standard PM fibers use a PANDA fiber geometry, with two circular stress rods. OZ Optics can provide fibers with other geometries, such as Bow-tie PM fibers.

Like OZ Optics’ single mode fibers, the wavelength range is limited by their cutoff wavelengths and bend sensitivity at long wavelengths. OZ Optics offers special broadband RGB PM fibers for visible light applications, able to transmit light from 400 nm to 650 nm.

Standard PM fibers (PMF) normally have a germanium doped core with a pure silica cladding, while for wavelengths shorter than 600 nm, OZ Optics instead uses fibers with a pure fused silica core with a fluorine doped cladding (QPMF fibers).

For many high-power applications transmitting tens of Watts of optical power, standard single mode fibers are not suitable because of their small core size. On the other hand, multi mode fibers suffer from speckle patterns and large beam sizes.

Large mode area (LMA) fibers offer a compromise by giving a large core size for high power handling at the expense of a lower numerical aperture, making them more sensitive to bending losses. In many cases, these fibers are not truly single mode, but are better described as low-order multi mode fibers. However, by carefully controlling how light is launched in these fibers and how much they bend, one can transmit nearly single mode light, thus generating output beams that can be focused to the small spot sizes needed for laser marking, welding and machining operations.

Key Features:

• Huge Variety of Fibers Available Uncabled and Precabled
• Polarization Maintaining (PM) and Large Mode Area (LMA) Polarization Maintaining Fibers
• Fibers for Wavelengths from 350 nm to 2200 nm
• Core Diameter: 2 µm to 8.7 µm, 20 µm for Large Mode Area (LMA) Fibers
• Cladding Diameter: 125 µm, LMA Fibers Also 130, 250 µm
• Mode Field Diameter: 2.3 µm to 10.5 µm
• Jacket or Buffer Diameter: 0.25 mm to 0.9 mm
• Attenuation: <0.5 dB/km to <200 dB/km
• Numerical Aperture (NA): 0.11 to 0.2, 0.08 to 0.085 for Large Mode Area (LMA) Fibers
• Effective Numerical Aperture (1/e²): 0.082 to 0.155
• Polarization Crosstalk: <-20, <-25, <-30 dB

Applications: Telecommunications; Life Sciences and Biotechnology; Industrial; Sensing