SMC-630-3-20TC/28C-xxx

The main features of the fiber cable type SMC-630-3-20TC/28C-xxx (also known as SMC-630-4.0-NA012-3-OPC.TI/APC-C-xxx) include

Fiber
The fiber is a single-mode fiber, defined by its NA and its cut-off wavelength. The nominal NA is 0.12 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 0.083 and a cut-off wavelength λ_co of 600 nm. Maximum wavelength is 770 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.

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 FC PC (0 deg polish, amagnetic, core-centered, narrow key) at the one end and a fiber connector of type FC APC (8 deg polish, core-centered, narrow key) at the other end. All of the fiber connectors of type FC have an alignment index (key). The narrow key (type "R") fiber connector has an alignment index (key) of 2 mm width.

The fiber has at least one core-centered connector to avoid misalignment of mechanical and optical axes, that might occur due to manufacturing tolerances.

Amagnetic fiber connectors
Amagnetic fiber connectors are completely made of titanium and have a ceramic ferrule. This ensures that the relative permeability µ_r of the connector is near 1 (χ = 5·10^-5, µ_r = 1.00005), making it transparent to magnetic fields.