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FORJ: Ultra-compact multi-channel fiber optic rotary joint (ZJn series, SM & MM)


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Princetel's relentless drive for small size has resulted in our ZJn series multi-pass Fiberoptic Rotary Joints (FORJs). They have taken place of the MXn series FORJs as the most compact multi-channel products. Up to four independent fiber channels can be simultaneously connected through the ZJn. They are ideal when combined with electrical slip rings or RF rotary joints or when space is tight in general. The extreme small size does not mean that there is any compromise on performnace. They still feature low insertion loss, low crosstalk (<-60 dB), and high return loss performance. Singlemode or multimode fibers can be mixed in one device.

Note: All insertion loss and return loss measurements are performed by joining the FORJ to the light source through fusion splice (without the use of connectors). Insertion loss of all receptacle type of FORJs, such as RST, RFC, and RFCX, are measured with connectors of similar type. Their return loss is not measured.

Wavelength 1270-1610 nm for SM; 850 and 1310 nm for MM
Insertion loss <5 dB (typical: 2-3 dB)
Insertion loss ripple ~+/-0.5 to 1 dB
Return loss (SM) >45 dB
Crosstalk >50 dB (typical: 63 dB)
Chromatic dispersion <0.01 ps/nm
Polarization mode dispersion <0.01 ps
Maximum speed 400 rpm
Pulling strength 10 N
Start up torque <1 Nm
Estimated life cycle 100-200 million revolutions
Optical power handling 23 dBm
Working temperature -20 to 65 C
Storage temperature -25 to 75 C
Package style Pigtails
Housing material Stainless steel
Fiber types SM or MM w/3 mm jacket (Kevlar/PVC or armor)
Connector types FC, SC, ST, SMA, LC or /APCs
Dimensions 25 mm dia. x 120 mm length
Weight ~0.5 kg
Vibration MIL-STD-167-1
Mechanical shock MIL-STD-810F
IP rating IP60 (ZJn); IP65 (ZJnL)

ZJn (n=2-4)- wavelength code- fiber code- connector code
ZJnL (IP65 rated; n=2-4)- wavelength code- fiber code- connector code


Download PDF drawing (ZJn)
Download Solidworks 3-D drawing (ZJn)
Download PDF drawing (ZJnL)
Download Solidworks 3-D drawing (ZJnL)

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