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CMS GCT ESR

CMS GCT ESR. Optical connections and Patch Panel Magnus Hansen 20060510. Special Thanks. Irakli Mandjavidze (CEA Saclay) Responsible for the development of the ECAL Selective Readout Processor (SRP) Using identical optical components and fibers Has been extremely helpful.

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CMS GCT ESR

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  1. CMS GCT ESR Optical connections and Patch Panel Magnus Hansen 20060510

  2. Special Thanks • Irakli Mandjavidze (CEA Saclay) • Responsible for the development of the ECAL Selective Readout Processor (SRP) • Using identical optical components and fibers • Has been extremely helpful M. Hansen, CERN. magnus.hansen@cern.ch

  3. Initial requirements • COTs • No radiation hardness • Halogen free for the underground area M. Hansen, CERN. magnus.hansen@cern.ch

  4. Optical Components • Source card • Avago HFBR-5720ALP • 850 nm SFP • ~0 to ~2Gbit • Off the shelf • Ordered, not received • Leaf Card • Avago AFBR-742B • 850 nm parallel optical receiver (SNAP12) • ~1 to ~2.5GHz @ < 50m • Ordered, not received M. Hansen, CERN. magnus.hansen@cern.ch

  5. Optical Fibers • Baseline solution • 216 ~15m single fibers with LC termination running from RCT racks to GCT racks (COTs) • 24 (26) breakout cassettes 12*LC to 1*MPO (COTs) • 24 (26) ~2m fiber bundles, each with 12 internal fibers (COTs) • Modified solution under investigation • 18 ~15m 12 fiber ribbons with 12 * LC termination in both ends • Somewhat specially made • 24 (26) ~2m 12 fiber ribbons with 12 * LC termination in one end and MPO termination on the other • Somewhat specially made • Advantages • Only 1 bundle / RCT crate to pull between floors • One optical connector less M. Hansen, CERN. magnus.hansen@cern.ch

  6. Fiber Routing M. Hansen, CERN. magnus.hansen@cern.ch

  7. Power Budget • Source (HFBR-5720ALP) • Max -1.5dBm • Typical -6dBm • Min -10 dBm • Fibre connection loss • Min 0dB • Max -2dB (Absolute maximum loss) • At receiver • Max -1.5dBm • Min -12dBm • Acceptable levels at receiver (AFBR-732B) • Max -1.22 dBm • Min -13dBm, “stressed” receiver -11.8 dBm • Conclusion • OK. M. Hansen, CERN. magnus.hansen@cern.ch

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