1. 05/07/2010P. LamareBackbone dry solution Dry backbone requirements

2. 05/07/2010P. LamareBackbone dry solution Configuration  DU layout 20 storeys Distance between storeys: 40 m 1 st storey at 120m above sea bed Dummy storeys between sea floor and 1 st storey Total height of the DU: 860 m  Storey configuration 2 Multi PMT OMs: backbone connected to each OMs 6 Single PMT OMs: backbone connected to an electronic container

3. 05/07/2010P. LamareBackbone dry solution Readout architecture  Only one scheme described in the TDR which implies many fibres in the backbone (even with filter in the middle of the DU)  Other schemes possible? Waiting answer... OADM X 5 OADM X 5 OADM X 5 OADM X 5 MUX Storey 20 Storey 19 Storey 1 Storey 20 Storey 1 OADM TDR

4. 05/07/2010P. LamareBackbone dry solution Requirements  30 mm max outer diameter  Negative weight  More than one segment (4 segments at least?)  Junction between segment: connector (preferred) or fusion splicing  The backbone will pass through the storey frame  Axial working load resistance : few tens of kg  Cable free between 2 storeys in the axis of the DU  Attenuation optical connectors: ≤ 0.5dB  Optical fibre: Single mode

5. 05/07/2010P. LamareBackbone dry solution Backbone study  Mainly for sPMT OM (adaptation to mPMT OM to be checked).  Evaluation of 2 solutions: Basic With less single point failure Choice made taking into account: cost, technical issues and risks  Separate power from optical fibre?

6. 05/07/2010P. LamareBackbone dry solution Example of a basic solution dry cable 2 backbones Connectors 2 pins Electrical 2 wires, 1mm 2 Optical 1 OF Breakout with Add/drop Connectors 1OF 1 backbone Electro-optical 2E, 1 OF Breakout with Add/drop Connectors 2E, 1OF Fibre scheme OADM

7. 05/07/2010P. LamareBackbone dry solution Scheme of other solution Storey 1 Storey 20 Storey 10 Base Cable 8E, 4OF Breakout or Y Connectors Cable 6E, 3OF Cable 2E, 1OF Cable 4E, 2OF DWDM filter Fibre scheme OADM X 5 OADM X 5 OAD M X 5 OADM X 5

8. 05/07/2010P. LamareBackbone dry solution Mixed solution PBOF/dry 2 backbones Connectors 2 pins Electrical dry 8 wires, 0,6mm 2 Optical 4 OF Breakout PBOF Connectors 1OF 1 backbone Electro-optical Connector 5 OF Dry box with filter Connector or penetrator Connectors 2 wires 4 OF 8 E Breakout PBOF 5 OF 2 E Connector or penetrator 3OF 6 E 3OF Connectors 1OF, 2E Dry box with filter Dry or PBOF

9. 05/07/2010P. LamareBackbone dry solution Milestones and resources  Resources Work mainly shared by CEA and INFN  Milestones Study : October 2010 Prototype: January 2011 On shore tests: February 2011 Offshore tests: April 2011