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FORJ: Ultra low reflection fiber rotary joints (MJP Series)


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The MJP series FORJs distinguish themselves from other Princetel single-channel FORJs such as the the popular RPT model. Model MJP is not fluid filled. It offers very high return loss performance (>55 or >60 dB). Start up torque is lower and it can spin at high speed, perfect for optical coherence tomography (OCT) applications. It can also accept custom fibers, primarily fibers with cladding diameter larger than 125 um.

The second picture on the left shows a standard MJP in a drive mechanism (gear) and SC/APC receptacle. We also offer a belt drive version (download drawing near the bottom of the page). Both versions are very convenient for OCT applications. The FORJ is isolated mechanically from the gear and the SC receptacle so the probe won't have any adverse effect on the performance of the FORJ.

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 1310, 1550 nm, or both (850, 1310 nm, or both)
Insertion loss <2 dB (typical: <1 dB)
Insertion loss ripple <+/-0.5 dB
Return loss (SM) >55 dB (MJPP: >60 dB)
Maximum speed 10,000 rpm
Pressure compensation No (Consider our RPC series FORJs)
Pulling strength 10 N (900 um buffer)
Start up torque <0.01 Nm
Estimated life cycle >500 million revolutions (1,000 rpm/365 days continous)
Optical power handling >23 dBm
Working temperature -20 to 65 C
Storage temperature -25 to 75 C
Package style Pigtail on both ends
Housing material Stainless steel
Fiber types Singlemode or multimode
Connector types FC, SC, ST, SMA, LC or /APCs
Dimensions 17.0 mm dia. x 48.5 mm length
Weight ~85 g
Vibration MIL-STD-167-1A
Mechanical shock MIL-STD-810G
IP rating IP 50

MJP- wavelength code- fiber code- connector code


Download PDF drawing for MJP (plain FORJ)
Download PDF drawing for MJP-SAP (gear drive)
Download PDF drawing for gear
Download PDF drawing for MJP-SAPB (belt drive)
Download PDF drawing for belt drive pulley
Download Solidworks 3-D drawing for MJP
Download Solidworks 3-D drawing for MJP-SAP
Download Solidworks 3-D drawing for MJP-SAPB

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