These Fiber Port Clusters are compact opto-mechanical units that splits a fiber-coupled source into multiple output fiber cables with high efficiency and variable splitting ratio.Optical Setup
The input port is fiber-coupled to PM fiber cable
. A polarizer defines the input polarization which is necessary for a long term stable splitting ratio.
A photo diode right after the input port allows for a continuous monitoring of the radiation.
Subsequently, the radiation splitting is achieved by using a cascade of rotary half-wave plates in combination with polarization beam splitters. By use of the rotary half-wave plates, almost any desired splitting ratio can be achieved.
At the output ports further polarizers are placed in order to define the polarization at output of the system.Fiber Couplers
A fundamental component of a Fiber Port Cluster is the Laser Beam Coupler
, which is the input into the opto-mechanical unit collimating the input radiation and, finally, couples the radiation back into the polarization-maintaining fiber cables. The stability of the total Fiber Port Cluster is determined by the stability
of the laser beam coupler.