28 July 2014 Fiber optical cable and connector system (FOCCoS) for PFS/ Subaru
Author Affiliations +
FOCCoS, "Fiber Optical Cable and Connector System" has the main function of capturing the direct light from the focal plane of Subaru Telescope using optical fibers, each one with a microlens in its tip, and conducting this light through a route containing connectors to a set of four spectrographs. The optical fiber cable is divided in 3 different segments called Cable A, Cable B and Cable C. Multi-fibers connectors assure precise connection among all optical fibers of the segments, providing flexibility for instrument changes. To assure strong and accurate connection, these sets are arranged inside two types of assemblies: the Tower Connector, for connection between Cable C and Cable B; and the Gang Connector, for connection between Cable B and Cable A. Throughput tests were made to evaluate the efficiency of the connections. A lifetime test connection is in progress. Cable C is installed inside the PFI, Prime Focus Instrument, where each fiber tip with a microlens is bonded to the end of the shaft of a 2-stage piezo-electric rotatory motor positioner; this assembly allows each fiber to be placed anywhere within its patrol region, which is 9.5mm diameter.. Each positioner uses a fiber arm to support the ferrule, the microlens, and the optical fiber. 2400 of these assemblies are arranged on a motor bench plate in a hexagonal-closed-packed disposition. All optical fibers from Cable C, protected by tubes, pass through the motors’ bench plate, three modular plates and a strain relief box, terminating at the Tower Connector. Cable B is permanently installed at Subaru Telescope structure, as a link between Cable C and Cable A. This cable B starts at the Tower Connector device, placed on a lateral structure of the telescope, and terminates at the Gang Connector device. Cable B will be routed to minimize the compression, torsion and bending caused by the cable weight and telescope motion. In the spectrograph room, Cable A starts at the Gang Connector, crosses a distribution box and terminates in a slit device. Each slit device receives approximately 600 optical fibers, linearly arrayed in a curve for better orientation of the light to the spectrograph collimator mirror. Four sets of Gang Connectors, distribution boxes and Slit devices complete one Cable A. This paper will review the general design of the FOCCoS subsystem, methods used to manufacture the involved devices, and the needed tests results to evaluate the total efficiency of the set.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Antonio Cesar de Oliveira, Antonio Cesar de Oliveira, Lígia Souza de Oliveira, Lígia Souza de Oliveira, Marcio V. de Arruda, Marcio V. de Arruda, Lucas Souza Marrara, Lucas Souza Marrara, Leandro H. dos Santos, Leandro H. dos Santos, Décio Ferreira, Décio Ferreira, Jesulino B. dos Santos, Jesulino B. dos Santos, Josimar A. Rosa, Josimar A. Rosa, Orlando V. Junior, Orlando V. Junior, Jeferson M. Pereira, Jeferson M. Pereira, Bruno Castilho, Bruno Castilho, Clemens Gneiding, Clemens Gneiding, Laerte S. Junior, Laerte S. Junior, Claudia M. de Oliveira, Claudia M. de Oliveira, James Gunn, James Gunn, Akitoshi Ueda, Akitoshi Ueda, Naruhisa Takato, Naruhisa Takato, Atsushi Shimono, Atsushi Shimono, Hajime Sugai, Hajime Sugai, Hiroshi Karoji, Hiroshi Karoji, Masahiko Kimura, Masahiko Kimura, Naoyuki Tamura, Naoyuki Tamura, Shiang-Yu Wang, Shiang-Yu Wang, Graham Murray, Graham Murray, David Le Mignant, David Le Mignant, Fabrice Madec, Fabrice Madec, Marc Jaquet, Marc Jaquet, Sebastien Vives, Sebastien Vives, Charlie Fisher, Charlie Fisher, David Braun, David Braun, Mark Schwochert, Mark Schwochert, Daniel J. Reiley, Daniel J. Reiley, "Fiber optical cable and connector system (FOCCoS) for PFS/ Subaru", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91514G (28 July 2014); doi: 10.1117/12.2056888; https://doi.org/10.1117/12.2056888


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