STUDY SUMMARY - IPMU

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<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Figure 3.11-1: Schematic of the fiber system from the positioners to the spectrograph. Pictures of key hardware from risk-reduction activities are also shown. 43
<strong>SUMMARY</strong> REPORT WIDE FIELD FIBER-FED OPTICAL MULTI-OBJECT SPECTROMETER (WFMOS) Figure 3.11-2: Fiber Throughput and the Contribution from Various Components The bulk attenuation of low-OH silica fibers, typically specified as loss in dB/km, is highly wavelength dependent in the 400–1,000–nm band. This bulk attenuation is well characterized and is practically independent of vendor or core size. To facilitate WFMOS installation and maintenance, fibers need to be sectioned and arranged for interconnection, which in turn introduces insertion losses. To connect up 2,400 fibers in a reasonable time, multi-fiber connectors are necessary. Fabrication of custom very-high-density fiber connectors with 30 rows of 28 fibers (rectangular pattern with fiber pitch of 200 μm) are planned to support WFMOS. To support 2,400 fibers, three such mating connector pairs will be fabricated, and the extra fibers will be used as spares or for alignment monitoring. LNA has built and tested a 5 × 5-fiber connector as part of preliminary risk-reduction activities. Test results indicate that the custom connectors meet requirements and that they can be scaled to the desired fiber counts. In the current baseline, there will be just one connector in each cable, and the throughput budget assumes an achievable connector efficiency of 88%. To minimize insertion loss degradation with repeated mate/de-mate cycles, we plan to use a dynamic connector scheme, in which one connector (mounted on a 3-DOF stage) is actively aligned to the other connector during installation. Tests on prototype indicate that positioning accuracies of
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STUDY SUMMARY - IPMU

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