Variable Polarization Beamsplitter Kits

Splits Polarized Light into Two Paths
Mechanically and Thermally Stable
Continuously Variable Split Ratio from 0 to 30 dB

FiberPort Accepts FC/PC and FC/APC Patch Cables
(3 Places)

PFS-FFT-1X2-1550

Kit for 1200 - 1600 nm

PFS-FFT-1X2-780

Kit for 700 - 1000 nm

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Overview
Graphs
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Variable Polarization Beamsplitter Kit Components^a
Item #	PFS-FFT-1X2-780	PFS-FFT-1X2-1550
FiberBench	FT-51X60
FiberPorts	3 x PAF2-2B	3 x PAF2-2C
Wall Plates	3 x HCA3-SM1
Polarizing Beamsplitter	FBT-PBS052	FBT-PBS054
Half-Wave Plate	FBR-AH2	FBR-AH3

These kits are shipped partially assembled but not aligned. Fiber patch cables can be purchased separately.

Click to Enlarge
These beamsplitter kits are shipped with their polarizing beamsplitters and half-wave plates packaged seperately.

Click to Enlarge
The polarizing beamsplitters are mounted on a kinematic base with tip, tilt, and fine rotation adjustment screws.

Features

Power is Fiber Limited to 10 W (CW, Typical)
Constructed Using FiberBench Accessories
Continuously Variable Split Ratio
Useful as a Variable 1 x 2 Coupler
Compatible with FC/PC and FC/APC Patch Cables
Extinction Ratio

T_p:T_s > 1000:1
R_s > 99.5%

700 - 1000 nm or 1200 - 1600 nm Operating Range
Please Contact Tech Support for Other Wavelengths or Custom-Aligned Kits

These Variable Polarization Beamsplitter Kits are based on Thorlabs' FT-51X60 Multi-Axis FiberBench. A PM fiber can be attached to the input FiberPort, which collimates the output. The FiberPorts included with these kits have wide key slots. The polarization of this beam is then rotated with a half-wave plate. By changing the orientation of the wave plate, the ratio of the vertical to horizontal State of Polarization (SOP) is changed, which then affects how much signal is transmitted and reflected through the polarizing beamsplitter cube.

These beamsplitters have extinction ratios of >1000:1 (T_P:T_S). The average p-component transmission is >90% while the average s-component reflectance is >99.5% for each beamsplitter. Please see the Graphs tab for more information. The split ratio is continuously variable from 0 to 30 dB and is dependent on the polarization extinction ratio from the input PM fiber and the spectral line width when Δλ ≤ 3 nm.

Assembly
These kits include all the hardware needed for assembly and adjustment. To assemble, insert the dowel pins of the half-wave plate and beamsplitter module into the desired slots on the FiberBench; lock their positions using the 2-56 set screws and 0.9 mm hex key. The beamsplitter cube can be aligned using four 0.050" hex adjustment screws, which can then be locked in place using their locking collars and the included SPW403 spanner wrench. The X, Y, and Zθ adjusters for each FiberPort also accept the 0.050" hex key. The sensitivity of the X and Y adjusters can be varied using the two holes located on the faceplate of the FiberPorts and the 0.028" hex key. The orientation of each FiberPort may be locked using the included 0-80 locking screws and the 0.050" hex key. Care must be taken when locking the FiberPort to avoid misalignment or damage. In most cases locking is not required. Please reference the FiberPort Manual for instructions. The rotation of the half-wave plate may be locked using the screw located at the top of the wave plate and the 0.050" hex key.

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

PFS-FFT-1X2-780 FiberBench Variable Polarization Beamsplitter Kit, 700 - 1000 nm

Click to Enlarge
The performance is limited by the beamsplitter coating. The faces of the PBS052 Beamsplitter Cube are AR coated over the 620 - 1000 nm wavelength range to increase transmission.

Click to Enlarge
Click Here for Raw Data
The blue shaded region denotes the operating wavelength of the
PFS-FFT-1X2-780 polarization beamsplitter kit.

PFS-FFT-1X2-1550 FiberBench Variable Polarization Beamsplitter Kit, 1200 - 1600 nm

Click to Enlarge
The performance is limited by the beamsplitter coating. The faces of the PBS054 Beamsplitter Cube are AR coated over the 1200 - 1600 nm wavelength range to increase transmission.

Click to Enlarge
Click Here for Raw Data
The blue shaded region denotes the operating wavelength of the
PFS-FFT-1X2-1550 polarization beamsplitter kit.

Posted Comments:

Preeti Yadav (posted 2024-06-26 13:32:59.357)

Hello! Since we already had waveplates that come with the polarization beamsplitter ket, we decided to order the different components (except the waveplates abd beamsplitter) to build the bench ourselves. However, only after receiving the components we realized that we should have ordered dust-covers along with it. The U-bench cover that came with FVC-1550-APC does not fit on the assembled PFS-FFT-1x2-1550. Do you have any suggestions? Or link for dust-covers for PFS-FFT-1x2-1550? Thank you, and best regards.

jdelia (posted 2024-06-28 01:46:31.0)

Thank you for contacting Thorlabs. We unfortunately do not currently offer dust covers for these polarization beamsplitter kits. That said, we would suggest looking into some of our blackout materials, such as our aluminum foil and masking tape, here: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=190. I have also reached out to you directly to discuss your application.

Preeti Yadav (posted 2024-03-18 11:09:22.467)

hello! I wanted to ask if it is straightforward to assemble this polarization beamsplitter kit if we have all the components (namely 1xFT-51X60, 3 x PAF2-2C, 3 x HCA3-SM1, FBT-PBS054 and FBR-AH3)? I am asking this because we already have some of these components, and wouldn't want to buy the whole kit then.

ksosnowski (posted 2024-03-21 03:46:09.0)

Hello Preeti, thanks for reaching out to Thorlabs. Yes we do list all of the components from these kits separately in our catalogue so it is fairly straightforward to assemble. Aligning the FiberPorts for optimal coupling is its own process and, even with the kits, alignment is necessary upon install. Our main FiberPort page has videos from Thorlabs' YouTube page detailing the alignment procedure using the 5 adjustment screws of the port. I have reached out directly to discuss this in further detail.

Preeti Yadav (posted 2023-10-26 14:02:54.66)

Hello! Can PFS-FFT-1X2-1550 be used to couple into MMF62.5 at the two output ports when using as PBS? Thanks!

cdolbashian (posted 2023-11-15 11:34:00.0)

Thank you for reaching out to us with this inquiry. We do indeed plan for this type of application with the component you mention here. I have contacted you directly to discuss your application.

Vytas Zickus (posted 2023-09-05 12:54:56.647)

Is it possible to attach a fourth port. Judging from .STL files, it does not look like the fourth port would attach?

cdolbashian (posted 2023-09-11 01:45:33.0)

Thank you for reaching out to us with this inquiry! On the mechanical drawings, we state: 8-32 HOLES, USED FOR MOUNTING WALL PLATES SOLD SEPARATELY. In this case, the wall plate mentioned here would be something like HCA3. I have contacted you directly to discuss the options available.

Daniel Hickstein (posted 2022-10-26 11:47:17.27)

If using this as a splitter, the polarization will be opposite on the two fibers, correct? In many situations, it would be nice if both of the output fibers had the same, standard (slow-axis) polarization. Is it possible to rotate the key of the port to rotate the polarization by 90 degrees? Or would it be necessary to use a second waveplate? Thanks!

jgreschler (posted 2022-10-28 03:41:25.0)

Thank you for reaching out to Thorlabs. You are correct that if you use this with two PM fibers with the same key alignment that results in two different states being launched. Fast axis aligned key fibers are available as a custom item. I have reached out to you directly to discuss quoting.

jgreschler (posted 2022-10-28 03:41:25.0)

mehmet sengunes (posted 2022-06-29 17:41:39.163)

Dear Madame or Sir, I would like to ask you that what are the alignment accuracies both tilt and X,Y? Best Mehmet

jdelia (posted 2022-07-19 01:46:17.0)

Thank you for contacting Thorlabs. I have reached out to you directly to clarify your inquiry.

Eusebio Bernabeu (posted 2021-04-22 09:28:32.197)

We need to know if PFS-FFT- 1x2 can be provide to 633 nm

YLohia (posted 2021-04-22 11:29:45.0)

Hello, the FBR-AH2 half-waveplate in the PFS-FFT-1X2-780 is the limiting factor (wavelength range: 700 - 1200 nm) for 633 nm operation. If you already have this part, you can obtain 633 nm operation by replacing the FBR-AH2 with the FBR-AH1. Custom wavelength configurations for these parts can be requested by clicking the "Request Quote" button above or by contacting your local Thorlabs Tech Support team (in your case, europe@thorlabs.com).

Igor Konieczniak (posted 2021-02-17 12:24:37.06)

Hello, For some of the fibre benches the site advertise a plastic dust cover. Does the PFS-FFT-1X2-1550 come with one? If not, can I purchase one separately? Cheers, Igor

YLohia (posted 2021-02-22 11:29:52.0)

Hello, the FiberPorts in the PFS-FFT-1X2-1550 also come with the receptacle dust covers.

akumr (posted 2018-06-19 07:10:29.78)

Can you offer me the "Variable Polarization Splitter Kit" for wavelength of 770 nm?

nbayconich (posted 2018-06-20 09:15:16.0)

Thank you for contacting Thorlabs. We can provide one of these fiberbench polarization beamsplitter kits designed for 770nm. I will contact you directly with a quote.

jjurado (posted 2011-08-09 12:24:00.0)

Response from Javier at Thorlabs to scottie730318: Thank you for your interest in our products. We can certainly offer version of the PFS-FFT-1X2-1550 polarization beam splitter kit for 1060 nm. I will contact you directly with price and availability information.

scottie730318 (posted 2011-08-09 12:16:37.0)

Dear sir: Can you offer me the "Variable Polarization Splitter Kit" for wavelength of 1060 nm?

apalmentieri (posted 2010-01-04 14:57:40.0)

A response from Adam at Thorlabs: I can provide you with more information and will make sure that the website is updated to include this information. The PBS cubes are designed to transmit the P component and reflect the S component. The P component has a tranmission > 96% and a reflection 98%. The extinction ratio of the transmitted P-component and reflected S-component is > 1000:1.

zyan (posted 2010-01-04 13:16:10.0)

Hi there, Can you send us some product of PBS, polarization beam splitter, or can you introduce a little more about the current product as well? Thanks, Zhizhong