- Fixed or Adjustable Coupling Available for a Variety of Applications
- Thermally and Mechanically Stable
- Easily Compatible with Thorlabs' Complete Line of FiberBench Components
- Beam Height is 14.3 mm Measured from the Deck
- 303 Non-Magnetic Stainless Steel
Thorlabs' adjustable and fixed fiber-to-fiber U-Benches consist of the FiberBench base combined with either two patch cables or two FiberPorts. The Adjustable U-Benches feature a FiberPort on either end that incorporates an AR-coated aspheric lens for one of three wavelength ranges: 400 - 600 nm (-A coating), 600 - 1050 nm (-B coating), and 1050 - 1600 nm (-C coating). The Fixed U-Benches feature two input and output FC/PC or FC/APC patch cables with a narrowband antireflection coating to minimize insertion and return losses. Please see the Specs Tab for more details.
The U-Benches allow for easy access to the optical beam and are ideal for fiber-to-fiber applications that incorporate multiple components and require the utmost in stability. While inserting thick optical components into the beam path, lateral offset can occur leading to additional insertion loss. The X-Y Tweaker Module can be used to compensate for up to 500 μm of beam displacement.
The U-Benches can be used in a variety of applications that consist of one-input one-output systems. One such application is the Polarization Controller which utilizes the adjustable U-Bench along with compatible three wave plates. Please see the Application Tab for more details.
|Item #||Bulkhead Type||EFL||Input MFDa||Output Waist Dia.||Max Waist Dist.b||Divergence||Lens Characteristics|
|CAc||NA||AR λ d|
|FBP-A-FC||FC/PC or APC||2.0 mm||3.5 µm||0.33 mm||96 mm||1.75 mrad||2.0 mm||0.50||400 - 600 nm|
|FBP-B-FC||FC/PC or APC||2.0 mm||4.3 µm||0.43 mm||89 mm||2.20 mrad||2.0 mm||0.50||600 - 1050 nm|
|FBP-C-FC||FC/PC or APC||2.0 mm||10.4 µm||0.38 mm||38 mm||5.20 mrad||2.0 mm||0.50||1050 - 1600 nm|
|aMode Field Diameter|
bMaximum distance that the beam waist can be from the lens while still remaining collimated
dWavelength Range of the Antireflection Coating
|Item #||Connectors||Wavelength||Bandwidth||Fiber Type||Beam Diameter (Typical)||Insertion Loss|
|FBC-780-FC||FC/PC||780 nm||±15 nm||780 HP||0.5 mm||0.85 ± 0.3 dB|
|FBC-1060-FC||FC/PC||1064 nm||±15 nm||1060XP||2.0 mm|
|FBC-1310-FC||FC/PC||1310 nm||±15 nm||SMF-28e||2.8 mm||0.6 ± 0.3 dB|
|FBC-1550-FC||FC/PC||1550 nm||±15 nm||3.1 mm|
We currently offer a Polarization Controller Kit consisting of the Adjustable U-Bench, two quarter-wave plates, and one half-wave plate. The U-Bench controller has the same function as a paddle controller, while offering a more deterministic and stable polarization manipulation. Since it does not have any hysteresis, it is possible to predict the controller's output State of Polarization (SOP) at any instant in time given only its input SOP. Hysteresis describes the lag that exists between the responding parameter and the changing parameter or, in this case, the time lag between the SOP change and the moving of the fiber paddles.
In any system with hysteresis, like a fiber paddle controller, there is no way to predict the output. When a paddle controller is adjusted, the SOP takes time to stabilize and may not stabilize at the intended value. Furthermore, without a polarimeter, the SOP from the paddle controller cannot be determined directly. With the U-Bench Polarization Controller, any input polarization state can be deterministcally rotated into a known output polarization state using a quarter-wave, half-wave, and another quarter-wave plate mounted (in this order) between the two FiberPorts of the Adjustable U-Bench. Each plate can be precisely and continuously rotated through 360°.