Pigtailed 1x1 Fiber-optic Rotary Joint Gen.3
Pigtailed 1x1 Fiber-optic Rotary Joint Gen.3
Fiber photometry experiments involve detecting small changes in fluorescence intensity, making it essential to minimize transmission variations introduced by fiber-optic rotary joints.
Due to the large-core multimode fibers used in fiber photometry and the inherent alignment tolerances of fiber-optic connectors, transmission stability is best achieved using a pigtailed fiber-optic. This configuration minimizes transmission fluctuations caused by fiber misalignment during rotation.
Two different optical fiber types are offered; first with robust all-silica construction having NA 0.37, second having hard-polymer cladding to achieve higher NA 0.57. Each is available with core diameter of 200 or 400 µm. On the static input, the standard cable length are 1 or 2 meters. The rotating output incorporates a short length optical fiber and features an FC connector to connect with the patchcord to the freely-moving subject.
Through improvements in both mechanical and optical design, the Pigtailed 1x1 Fiber-optic Rotary Joint Gen.3 reduces the transmission variations in rotation by factor 4 compared to previous generations, providing greater signal stability for demanding fiber photometry applications.
…generating
Fiber photometry experiments detect small power variations from a fluorophore and for that reason the fiber-optic rotary joints within the setup require minimal transmission variation. Because of large core multimode fibers and connector tolerances, transmission variation can only be minimized using a pigtailed version of 1x1 fiber-optic rotary joint. The pigtailed patch cords are made from 0.37 or 0.57 NA, 200 or 400 µm diameter optical fiber with a lightweight metal jacket and FC connectors. The fixed input patch cord measures between 1 and 2 meters in its standard version, while the output rotating patch cord is 0.15 meters long. Different length fiber-optic patch cords can be connected to the output using an FC/FC mating adapter.
By improving the overall mechanical and optical design, we were able to improve the transmission variations compared to previous generations of pigtailed 1x1 Fiber-optic Rotary joints.
| Specification | FRJ 1×1 Connectorized |
FRJ 1×1 PT Gen. 2 |
FRJ 1×1 PT Gen. 3 NEW |
|---|---|---|---|
| Transmission* | > 80% | > 70% | > 70% |
| Variation (1-way) | 1–5% | < 1% | < 0.25% |
| Variation (2-way) | 2–10% | < 2% | < 0.5% |
| Starting torque | < 20 µN·m | < 250 µN·m | < 250 µN·m |
| * Pigtailed version transmission is lower because it inclused one additional fiber connection. | |||
Item includes :
- Pigtailed 1x1 Fiber-optic Rotary Joint Gen.2
Add optional items :
- Compatible Holder FRJ_1x1_PT-G2
- Gimbal Holder for FRJ_1x1_PT-G2: allows pivoting the rotary joint along two additional axes, further reducing the mechanical stress on the animal.
- Mating adapters: used to connect different patch cords to the optical fibers already linked to the rotary joint.
| Maximum variation | < 0.2 % peak-to-peak (1-way) < 0.5 % peak-to-peak (2-way) |
| Transmission | >65 % (typical 70%) |
| Typical fiber configuration | 200 or 400 µm core - NA 0.37 or 0.57 |
| Optical fiber | stator : 1.0, 1.5 or 2.0 meters with ARMO Black jacket rotor : integrated |
| Start up torque | < 250 µN·m |
| Outer Diameter for holder | 19 mm |
| Mass | 45 g without optical fibers |
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