2x2 Pigtailed Fiber-optic Rotary Joint

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  • The Pigtailed 2x2 Fiber-optic Rotary Joints have 2 optical channels with static side pigtailed with 1m long FC-connectorized optical fibers. Due to the fragility of the pigtailed connection, the rotating side has two M3 receptacles. The patch cords have a 200 or 400 μm core, 0.37 or 0.57 NA optical fibers, and ARMO jackets on the rotating side for maximum reliability. The optical channels follow separate paths and have low loss,  minimum possible signal variations during rotation, and no crosstalk.

    Inside the joints are high NA aspheric lenses to match high NA optical fibers of LED or Ce:YAG light sources used for fiber photometry. Aspheric lenses are optimized for 530 nm but perform reasonably well for other wavelengths.

    This passive pigtailed fiber-optic rotary joint is intended for fiber photometry experiments involving recordings at two different brain sites/regions of the larger tethered behaving animals like rats.



  • Optical Fiber Stator: 2x 1 meter long, FC/PC, ARMO Black jacket
    Rotor: 2x M3 receptacle, LWMJ jacket
    Transmission > 50 % (60% typical)
    Maximum Variation < 1.5 % peak-to-peak
    Design Wavelength 530 nm
    Start up Torque < 3000 µN·m
    too high for mice but acceptable for rats or larger animals
  • FRJ_2x2_PT Drawing