Thorlabs offers three polarization modules that can be used with our FiberBenches. Each module has two dowel pins on its base that precisely align it on a FiberBench. The Linear Polarization Reference Module is ideal for use in PM fiber alignment, polarimetry, and extinction ratio measurements. The Rotating Linear Polarizer Modules are made from dichroic film polarizers fitted into a rotating mount that allows the user to easily adjust the State of Polarization (SOP). The left-/right-handed Walk-Off Polarizer Modules consist of an AR-Coated Calcite crystal on a static mounting base. They are designed to displace the horizontal polarization for a variety of wavelength ranges. For more information or custom requests, please contact FiberBench@Thorlabs.com.

FiberBench Accesories
FiberPorts	Optic Mounts	Alignment Tools	Polarizers
Beamsplitter Modules	Mirror Modules	Rotating Wave Plates	FiberBenches

Rotating Linear Polarizer Modules

Item #	Wavelength	Transmission	Extinction
PCB-2.5-VIS	440 - 650 nm	>80%	>40 dB
PCB-2.5-NIR	750 - 870 nm	>93%	>40 dB
PCB-2.5-YAG	970 - 1100 nm	>96%	>40 dB
PCB-2.5-1310	1270 - 1350 nm	>97%	>40 dB
PCB-2.5-1550	1500 - 1600 nm	>98%	>40 dB

Calcite Walk-Off Polarizer Modules

Item #	Wavelength	Transmission	Extinction
PBB-VIS-10-L	620 - 690 nm	>96%	>50 dB
PBB-VIS-10-R	620 - 690 nm	>96%	>50 dB
PBB-NIR-10-L	770 - 870 nm	>97%	>50 dB
PBB-NIR-10-R	770 - 870 nm	>97%	>50 dB
PBB-YAG-10-L	970 - 1080 nm	>97%	>50 dB
PBB-YAG-10-R	970 - 1080 nm	>97%	>50 dB
PBB-IR-10-L	1280 - 1625 nm	>97%	>50 dB
PBB-IR-10-R	1280 - 1625 nm	>97%	>50 dB

Variable Optical Attenuator Application

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A continuously variable attenuator can be assembled using the FiberBench components listed in the table below. The FiberPort collimates the beam from a SM or PM fiber, and the collimated beam then goes through a calcite walk-off polarizer where it is split into its respective horizontal (P) and vertical (S) components. The orientation of the wave plate controls how much energy is in the beam. It can be rotated to give the desired attenuation - zero, partial, or full. The signal then enters a reversed calcite walk-off polarizer where it will be recombined or further separated. The only energy that will couple back into the output fiber is the signal on the central axis. The central beam will then be focused into the output fiber by the output PAF FiberPort.

Item #	Qty	Description
PBB-IR-10-L	1	Calcite Walk-Off Polarizer (Left-Handed)
PBB-IR-10-R	1	Calcite Walk-Off Polarizer (Right-Handed)
PAF-X-2-C	2	Fiber Collimator/Coupler
FB-51W	1	FiberBench
RABH-1600	1	Rotating Half-Wave Plate
P1-830A-FC-2 (or similar cable)	2	SM or PM Fiber Patchcord Required

Zero Attenuation

The RABH wave plate is rotated so that there is only one output beam; this also means that the input and output polarizations are the same.

Partial Attenuation

The RABH wave plate is rotated so that there are three output beams. The RABH orientation will control how much energy is in each beam. The only energy that will couple into the fiber is the energy in the central beam. The attenuation range is 1 to 40 dB with any value in between.

Full Attenuation

The RABH wave plate is rotated so that there are two output beams, which will be displaced to the left and to the right of the center. In this position, there will be minimal coupling efficiency, resulting in a maximum attenuation of 40 dB.

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Posted Comments:

Poster: jjurado

Posted Date: 2011-03-31 17:57:00.0

Response from Javier at Thorlabs to Benjamin: Thank you for contacting us. The fiber bench components are attached to the bench through a slip fit of the dowel pins into the mounting holes. The diameter of the dowel pins is 0.125" and the mounting hole diameter is 0.126" (+0.001"/-0.000"), which provides a tight fit between these mating parts. As a result, our fiber tables provide a stable support for polarizer modules and a variety of other optical components, and is also suitable for interferometry applications.

Poster: benju

Posted Date: 2011-03-31 14:46:38.0

How are items fastened/secured to the fiber table? Do they just slot in? Does that provide sufficient stability for interferometry applications? Thanks, Benjamin

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FiberBench Polarization Modules

Rotating Linear Polarizer Modules

Calcite Walk-Off Polarizer Modules

Variable Optical Attenuator Application