C.Fukunaga, TGC electronics meeting at CERN May 14,2000 G-Link study G-link will be used between Hi-Pt and Sector Logic in USA15 –Length: ~80m –Bandwidth:20bit*40MHz=0.8Gb/s.

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C.Fukunaga, TGC electronics meeting at CERN May 14,2000 G-Link study G-link will be used between Hi-Pt and Sector Logic in USA15 –Length: ~80m –Bandwidth:20bit*40MHz=0.8Gb/s (Gbit Ethernet) Its well-established technique will be easily adopted to our system development. But need another refinement for choice of VCSEL and optical fiber.

C.Fukunaga, TGC electronics meeting at CERN May 14,2000 Generic G-link VCSEL PIN-diode

C.Fukunaga, TGC electronics meeting at CERN May 14,2000 VCSEL Laser Diode Vertical Cavity Surface Emitting Laser High bandwidth (1-10Gbps) Surface emitter –Good connectivity with optical fibre –Emission test on wafer -cheap High output power/low power consumption Yet a few products for 850nm light emission Laser emission

C.Fukunaga, TGC electronics meeting at CERN May 14,2000 Optical Fibre Low divergence, circular beam profile from vcsel is appropriate for multimode fibre Recent technical development of GB/10Gb Ethernet makes easier to select appropriate fibre (IEEE 802.3z 1000BASE-SX complied;Core/Outer radii 50/125um;Graded index). Fibres with 1Gb/s are (will be soon) available. Surface emissionEdge Emission