Fiber Coupled Laser
Fiber Coupled Laser Diodes couple the laser light from the laser diode into a optical fiber. Coupling the output of a laser diode into an optical fiber makes delivering light easier. Fiber-coupled diode lasers also have several other advantages: The light exiting the fiber has a circular and uniform intensity profile.
That is why the most common laser diode to fiber coupling approach is via a lensed and often tapered fiber. The tapered fiber tips change the mode field diameter (MFD) of the fiber. … In both cases, a lens at the taper tip is fabricated to reduce the MFD for better coupling efficiency.