48-FPC-2-3_n-xxx

Fiber Port Cluster 2 ⇾ 3 (with additional polarizer)

FiberPortCluster_2-3
FiberPortCluster_2-3
FiberPortCluster_2-3
FiberPortCluster_2-3

Features

Fiber Port Cluster type 48-FPC-2-3_n-xxx for two input sources with the same wavelength.
  • Configuration 2 ⇾ 3 n
  • Highly efficient coupling into polarization-maintaining fiber cables
  • Adjustable splitting ratio
  • Compact, rugged, transportable and sealed opto-mechanical units
  • Fully fiber-coupled
  • Very high long-term stability, efficiency and reproducability
  • Parallel superposition of input polarizations in all three output ports

Description

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.


48-FPC-2-3_n

Technical data

48-FPC-2-3_n-xxx

Order Code
48-FPC-2-3-xxx
Configuration
2 ⇾ 3
Wavelengths*
589, 671, 767, 773, 780, 852 nm
Fiber type
polarization-maintaining
Connector type
FC APC (standard)
Cable lengths
Customer-specific
Wave plate type
low order (773 nm: zero order)
Power monitor
BPX-61 (SMA)
Transmission
≥ 58 % @ 780 nm
Polarization Extinction Ratio
≥ 23 dB @ 780 nm
Balancing
see technote
* Different wavelength combinations on request

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