Multi-fibers connectors systems for FOCCoS-PFS-Subaru
2014
The Fiber Optical Cable and Connector System (FOCCoS), provides optical connection between 2400
positioners and a set of spectrographs through optical fibers cables as part of PFS instrument for Subaru telescope. The
optical fiber cable will be segmented in 3 parts along the route, cable A, cable B and cable C, connected by a set of
multi-fiber connectors. The company USCONEC produces the multi-fiber connector under study. The USCONEC 32F
model can connect 32 optical fibers in a 4 x 8 matrix arrangement. The ferrules are made of a durable composite,
Polyphenylene Sulfide (PPS) based thermoplastic. The connections are held in place by a push-on/pull-off latch, and the
connector can also be distinguished by a pair of metal guide pins that protrude from the front of the connector. Two
fibers per connector will be used for monitoring the connection procedure. It was found to be easy to polish and it is
small enough to be mounted in groups.
Highly multiplexed instruments like PFS require a fiber connector system that can deliver excellent optical
performance and reliability. PFS requires two different types of structures to organize the connectors. The Tower
Connector system, with 80 multi-fiber connectors, will be a group of connectors for connecting cable B (Telescope
Structure) with cable C (Positioners Plate). The Gang Connector system is a group of 8 gang connectors, each one with
12 multi-fibers connectors, for connecting cable B (Telescope Structure) with cable A (Spectrograph). The bench tests
with these connector systems and the chosen fibers should measure the throughput of light and the stability after many
connections and disconnections. In this paper we describe tests and procedures to evaluate the throughput and FRD
increment. The lifetime of the ferrules is also in evaluation.
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