Polarization-maintaining Fiber Cables
(PM Fibers)

polarization-maintaining, single-mode fibers series PMC with Gaussian intensity profile

Representative product images. Individual product images are found on the individual product pages.


Polarization-maintaining, single-mode fiber cable with Gaussian intensity distribution and low-stress fiber connectors.
  • Cut-off wavelengths from 360 nm to 1550 nm
  • Wavelengths covering altogether 360nm to 1800 nm - each fiber with an operational wavelength range of about 100-300 nm.
  • Special broadband fiber RGB with an operational wavelength range 400-680 nm
  • Pure Silica core fibers with low attenuation for wavelengths < 460 nm
  • Measured values for fiber NA: NAe2
  • Special fibers with small NA for smaller power density in the fiber core
  • Fiber patch cable with Ø 900 µm buffer or as Ø 3 mm Cable with Kevlar strain-relief
  • Customer-specified connectors type FC, AVIM (comp. to LSA) or E2000 with  0°-polish or 8°-polish
  • Polarization axis is indicated by ­connector index key (slow axis), only for Type FC connectors
  • Amagnetic titanium connectors for connectors of type FC PC or FC APC
  • End caps for a smaller power density at the fiber end-faces


Polarization-maintaining, single-mode fiber cable (PM fiber cable) with Gaussian intensity distribution and low-stress fiber connectors.

The fiber is a polarization-maintaining, single-mode fiber, defined by its NA and its cut-off wavelength. The nom. NA is specified by the fiber manufacturer. Additionally the effective numerical NAe2 is measured for each fiber batch by Schäfter+Kirchhoff. Cut-off wavelengths range from 360 nm to 1550 nm and the fibers altogether cover a wavelength range of 360 nm to 1800 nm. Each fiber has an operational wavelength range of about 100-300 nm. Besides the nominal cut-off wavelenght λco, Schäfter+Kirchhoff also offers measured data for the cut-off wavelength for each individual fiber cable.
Some fibers have special features e.g.

  • Pure silica core for long-term stable low attenuation and high transmission for < 460 nm
  • Special fibers with extra low NA that leads to a lower power density in the fiber core compared to a standard fiber with standard NA. The maximum power level (described by the Brillouin threshhold) that can be transmitted in the fiber is shifted to a higher value. Please note that there are other limiting factors e.g. concerning the fiber end faces.

Fiber Cable
The fiber length can be customer-specified (there is a minimum fiber length). The polarization-maintaining fiber cables are offered as Ø 900 µm buffer in black, or a Ø 3 mm cable in black with Kevlar strain-relief.

Fiber Connectors
For each fiber end the fiber connectors can be selected from a wide range of connector types (FC, DIN or AVIO, E2000, ST (only 0°-polish), or F-SMA (only 0°-polish) with  0°-polish or 8°-polish. All  fiber connectors of type FC assembled by Schäfter+Kirchhoff have an alignment index (key). The wide key (type "N")  fiber connector has an alignment index (key) of 2.14 mm width. The narrow key (type "R")  fiber connector has an alignment index (key) of 2 mm width. Special fiber connectors are available so that the fiber cable is vaccum compatible down to 10-7 mbar (only Ø 900 µm buffer fiber cables).

End Caps
The fiber connectors can be equipped with an end cap connector. This means that a short length of fiber (< 300 µm) without a core is spliced onto the polarization-maintaining fiber. Without a fiber core to confine the beam, the mode field diameter of the beam already starts to diverge within the fiber end cap, significantly reducing the power density at the fiber end-face.

Amagnetic fiber connectors
For FC PC or FC APC type connectors amagnetic versions completely made of titanium can be selected. Those connectors have a ceramic ferrule.


Measurement tool for coupling into polarization-maintaining fiber cables

Fiber Adapters without Optics
Fiber connector cleaning tool