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SM Fiber-Based Polarization Beam Combiner/Splitter

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Fiber-Based Polarization Beam Combiners / Splitters, 1 SM and 2 PM Ports




  • Combine or Split Orthogonal Polarizations
  • 780,980,1064, and 1550 nm operating Wavelengths
  • Ideal for Combining Pump Laser Signals Prior to Amplification

Features

  • Combine or Split Orthogonal Polarizations in Fiber Optic Systems
  • High Extinction Ratio
  • Bidirectional: One Single Mode Port and Two Polarization-Maintaining Ports
  • 1 m of Ø900 µm Jacketed Fiber on Each Leg
  • Choose from FC/PC or FC/APC Connectors

Thorlabs' Single Mode Fiber-Based Polarization Beam Combiners (PBC) or Splitters are designed to either combine two orthogonal polarizations into a single fiber or split a single input into its orthogonal linear polarizations through two fiber outputs. The devices on this page feature two legs of polarization-maintaining (PM) fiber on one side of a calcite prism and a single mode (SM) fiber on the other. The legs on the side with the two PM fibers have the slow axis of the fiber aligned for maximum transmission of one polarization state.

Our single mode PBC features one leg of single mode fiber and two legs of polarization-maintaining fiber as shown in the diagram to the right. If an unpolarized signal is sent into the single mode fiber (port 3), the calcite prism splits the light into orthogonal linear polarizations. The slow axis of each PM fiber is aligned to each of the polarized beams emitted from the prism (ports 1 and 2). This PBC can also be used in reverse to combine two orthogonal polarizations from the PM fiber legs into one single mode output.

This PBC can also be used in reverse to combine two orthogonal polarizations from the PM fiber legs into one single mode output. Light incident on ports 1 and 2 should be aligned to the slow axis. Light incident at ports 1 and 2 aligned to the fast axis of the fibers will refract differently through the prism and will not exit port 3.

These polarization beam combiners are frequently utilized to combine the light from two pump lasers into a single fiber to increase the input into an erbium-doped fiber amplifier or Raman amplifier.

Alternative PBC Options
Versions of our fiber-based PBCs using polarization-maintaining fiber for all three legs are available here. Thorlabs also offers the FiberBench system, which is a line of products designed for free-space manipulation of light within fiber-based systems. This line includes polarizer and beamsplitter modules for constructing custom PBCs. A prebuilt FiberBench-based variable polarization beam combiner / splitter is also available.

 

 

General Specificationsa
Return Loss FC/PC Connectors: ≥40 dB
FC/APC Connectors: ≥45 dB
Fiber Length 1 m on Each Leg
Length Tolerance +0.075 m / -0 m
Jacket Ø900 µm Loose Furcation Tubing
Size 1.38 " x Ø0.22" (35.0 mm x Ø5.5 mm)
Connector Keys Narrow (2.0 mm);
Aligned to Slow Axis for all PM Fiber Legs
  • Specified with Connectors

 

780 nm Polarization Beam Combiners, 1 SM Port and 2 PM Ports

 

Item #WavelengthInsertion LossExtinction
Ratio
Fiber TypeConnectors
CombinerSplitterSplitterPort 1Port 2Port 3
PBC780SM-FC 780 ± 20 nm ≤3.1 dB ≤6.1 dB ≥18 dB SM85-PS-U25A SM85-PS-U25A SM800-5.6-125 FC/PC
PBC780SM-APC 780 ± 20 nm ≤3.1 dB ≤6.1 dB ≥18 dB SM85-PS-U25A SM85-PS-U25A SM800-5.6-125 FC/APC

Note: All specifications are based on connectorized models.

 

980 nm Polarization Beam Combiners, 1 SM Port and 2 PM Ports

 

Item #WavelengthInsertion LossExtinction
Ratio
Fiber TypeConnectors
CombinerSplitterSplitterPort 1Port 2Port 3
PBC980SM-FC 980 ± 20 nm ≤2 dB ≤5 dB ≥18 dB SM98-PS-U25A SM98-PS-U25A HI1060 FC/PC
PBC980SM-APC 980 ± 20 nm ≤2 dB ≤5 dB ≥18 dB SM98-PS-U25A SM98-PS-U25A HI1060 FC/APC

Note: All specifications are based on connectorized models.

 

1064 nm Polarization Beam Combiners, 1 SM Port and 2 PM Ports

 

Item #WavelengthInsertion LossExtinction
Ratio
Fiber TypeConnectors
CombinerSplitterSplitterPort 1Port 2Port 3
PBC1064SM-FC 1064 ± 20 nm ≤1.8 dB ≤4.8 dB ≥20 dB SM98-PS-U25A SM98-PS-U25A HI1060 FC/PC
PBC1064SM-APC 1064 ± 20 nm ≤1.8 dB ≤4.8 dB ≥20 dB SM98-PS-U25A SM98-PS-U25A HI1060 FC/APC

Note: All specifications are based on connectorized models.

 

1550 nm Polarization Beam Combiners, 1 SM Port and 2 PM Ports

 

Item #WavelengthInsertion LossExtinction
Ratio
Fiber TypeConnectors
CombinerSplitterSplitterPort 1Port 2Port 3
PBC1550SM-FC 1550 ± 40 nm ≤1.2 dB ≤4.2 dB ≥20 dB SM15-PS-U25A SM15-PS-U25A SMF-28e FC/PC
PBC1550SM-APC 1550 ± 40 nm ≤1.2 dB ≤4.2 dB ≥20 dB SM15-PS-U25A SM15-PS-U25A SMF-28e FC/APC

Note: All specifications are based on connectorized models.

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