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FORJ: Multi-channel fibre optic rotary joint (MRn series, SM & MM)


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MRn series multi-pass Fibre optic Rotary Joints (FORJs) carry the largest channel count in Princetel's FORJ line up. 20-36 independent fibre channels are offered as standard options. The most common is 24-channel version. Loss and back reflection are uniform across all channels. There is no channel "drop off" or "blind spot" during rotation. They also feature low crosstalk performance (<-60 dB) for both single and multi-mode fibres.

Like our other multi-channel FORJs, all channels can accommodate either singlemode or multimode fibres. It is also possible to combine the two types of fibres in one device across three optical windows (850, 1310, and 1550 nm). As a rule of thumb, always consider lower channel count first for smaller size, lower cost, faster delivery, and easier handling. However, if massive channel count is necessary, Princetel's MRn series FORJs offer the best solution.

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 <6 dB (typical: 2-3 dB)
Insertion loss ripple <+/- 1.2 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 200 rpm
Pulling strength 10 N
Start up torque <1 Nm
Estimated life cycle 100 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
Fibre types SM or MM w/3 mm jacket, 1 m (Kevlar/PVC or armor)
Connector types FC, SC, ST, SMA, LC or /APCs
Dimensions 67 mm dia. x 221 mm length
Weight 3.5 kg
Vibration MIL-STD-167-1
Mechanical shock MIL-STD-810F
IP rating Up to IP 65

MRn- wavelength code- fiber code- connector code


Download PDF drawing for MRn
Download Solidworks 3-D drawing for MRn
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