Subaru Night-Sky Spectrograph (SuNSS) – Fiber cable construction

Antonio Cesar de Oliveira, James E. Gunn, Ligia Souza de Oliveira, Lucas Souza Marrara, Leandro Henrique dos Santos, Josimar Aparecido Rosa, Decio Ferreira, Craig Loomis, Robert Lupton, Yuki Moritani, Naruhisa Takato, Naoyuki Tamura

Research output: Chapter in Book/Report/Conference proceedingConference contribution


In this paper, we present details about the construction of the fiber cable of Subaru Night-Sky Spectrograph (SuNSS). This instrument addresses two of the major concerns on the PFS project, namely understanding the temporal and spatial behavior of the night sky emission, particularly in the red and infrared channels, and finding a way of accurate night sky subtraction for the fiber spectrographs. SuNSS is installed on the spider arm of Subaru telescope, and can deliver the lights to PFS spectrograph via the fiber cable called FOCCoS-B (Cable B). This means that SuNSS enables us to take sky spectra as long as the dome shutter is open even when PFI is not installed on the telescope. The SuNSS fiber cable consists of two sets of 127 optical fibers in a length of about 1330 mm; uniform-sky fiber set and imaging-sky fiber set. The input side is terminated with 127-fiber hexagonal-array ferrules. The output side is a Tower Connector system with MTPs ferrules, to attached with Cable B and provide light for the fiber slit on Spectrograph following the same coded map as PFS. As PFI does, the fibers to confirm connection are accommodated. Measured FRD was comparable to that of PFI.

Original languageEnglish (US)
Title of host publicationGround-based and Airborne Instrumentation for Astronomy IX
EditorsChristopher J. Evans, Julia J. Bryant, Kentaro Motohara
ISBN (Electronic)9781510653498
StatePublished - 2022
EventGround-based and Airborne Instrumentation for Astronomy IX 2022 - Montreal, Canada
Duration: Jul 17 2022Jul 22 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceGround-based and Airborne Instrumentation for Astronomy IX 2022

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Prime Focus
  • cabling
  • multi-fibers connectorization
  • night sky emission
  • optical fibers
  • spectrograph


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