Fiber Port Cluster 2 ⇾ 3 (with additional polarizer)
This Fiber Port Clusters 2 ⇾ 3 (with additional polarizer) is a compact opto-mechanical unit that combines two fiber-coupled sources with same wavelengths and then splits the combined radiation into 3 output fiber cables with high efficiency and variable splitting ratio.
Optical Setup
The two input ports are fiber-coupled to PM fiber cables. Polarizers define the input polarization which is necessary for a long term stable splitting ratio.
Two photo diodes right after each input port allow for a continuous monitoring of the radiation. The two input sources are superimposed by means of a polarization beam splitter.
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, see the tech note FiberPortCluster_2-6_Balancing.pdf for the limitations.
An additional attenuator at each output port allows for a fine-balancing.
At output three, the two input sources are superimposed with normal state of polarization. An additional polarizer rotated by 45° transforms them into parallel states of polarization.
Please note that this polarizer causes additional losses.
As an alternative there is the Fiber Port Cluster type 48-FPC-2-3 without this additional polarizer.
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.
How to order
For a detailed quotation please additionally specify
48-FPC-2-3_n-xxx
Measurement tool for coupling into polarization-maintaining fiber cables
