Optical High-speed Links Institute for Data Processing and - PowerPoint PPT Presentation

Optical High-speed Links Institute for Data Processing and Electronics Marc Schneider, Djorn Karnick, Lars Eisenblätter, Yunlong Zhang, Julius Hartmann, Thomas Kühner, Marc Weber 2017-10-17 www.kit.edu KIT – The Research University in the Helmholtz Association

Optical Data Transmission System WDM system On-detector: custom silicon photonic integrated circuit Off-detector: off-the-shelf components 2 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

pn-Modulators Optical mode concentrated around pn- junction Long term stable First devices available Concept studies on radiation hard devices 3 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Wavelength Division Multiplexers Planar Concave Gratings (PCG): Echelle gratings Compact Insensitive to edge roughness Diffraction grating Free-space region Optical fiber Multi- λ input signal diverges in 2D-free-space region Concave grating reflects and focuses optical radiation depending on wavelength Optical coupler Waveguide 4 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Wavelength Division Multiplexers 2 µ m 20 µ m Former test chip 20 µ m 5 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Integrated 4-Channel WDM-System Chip New chip submitted 4-channel WDM systems Channels fit into ITU-T G.694.1 DWDM channel grid 3.8 mm Former test chip 1.7 mm New design 6 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Integrated 4-Channel WDM-System Chip New chip submitted 4-channel WDM system Channels fit into ITU-T G.694.1 DWDM channel grid 9.3 mm Estimated delivery: December 2017 9.3 mm 7 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Optical Packaging Fiber-chip-coupling using angle-polished fibers Space-saving design, no power penalty, very good long term stability 3.25 mm 8 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Optical Packaging Coupling efficiency in non-stabilized environment No significant loss Measured optical power over more than one year normalized to highest value 9 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Modulator Drivers Phase 1: HMC870 evaluation boards Voltage swing: 2 drivers in series 8 × HMC870, 8 × Bias-T, lots of connections HMC870 Bias-T Bias-T DC-block HMC870 10 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Modulator Drivers Phase 2: Design and layout of driver board using commercial driver ICs Plan for Phase 3: custom ASIC to Increase power efficiency Photonic chip Reduce space requirements Control Achieve radiation hardness Control Signal 11 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Electrical Interfaces Input: ≈ 10 Gb/s - ??? 485 mV PP single ended 50 Ω 8B10B coding Output: Receiver of SFP+ modules (10G, 1550 nm) 12 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Silicon Photonics for HEP Started a collaboration in May 2017: Univ. Bristol, CERN, INFN Pisa, KIT Develop optical data link for next CMS experiment (and … ) and the FCC 13 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Further Idea … Just a transmitter 14 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Further Idea … Transceiver with 1 downlink 15 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Further Idea … Transceiver with 2 downlinks 16 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Further Idea … Transceiver with 3 downlinks 17 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Further Idea … Transceiver with dynamically configurable up- and downlinks (patent pending) 18 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links

Thank you! 19 2017-10-17 Dr.-Ing. Marc Schneider - Optical High-speed Links