PMC-980-L-3-30/18E-xxx

The main features of the fiber cable type PMC-980-L-3-30/18E-xxx (also known as PMC-E-980-10.5-NA009-3-SMA/APC.EC-xxx-P) include

Fiber
The fiber is a polarization-maintaning, single-mode Panda fiber, defined by its NA and its cut-off wavelength. The nominal NA is 0.085 and is specified by the fiber manufacturer. Additionally the effective numerical aperture NAe² is measured for each fiber batch by Schäfter + Kirchhoff. The fiber has an effective numerical aperture NAe² of 0.058 and a cut-off wavelength λ_co of 980 nm. Maximum wavelength is 1100 nm. Besides the nominal cut-off wavelength λ_co, Schäfter + Kirchhoff also offers measured data for the cut-off wavelength for each individual fiber cable.

The extra low NA of the fiber 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 cable has a 3 mm jacket in black with Kevlar strain-relief and a length of xx cm.

Fiber Connectors
The fiber cable is equipped with a fiber connector of type F-SMA (0 deg polish) at the one end and a fiber connector of type FC APC (8 deg polish, end cap, wide key) at the other end. All of the 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.

End Caps
The fiber is 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.