Versatile Link The Versatile Transceiver Development Status Csaba

Versatile Link The Versatile Transceiver Development Status Csaba Soos, Vincent Bobillier, Stéphane Détraz, Spyros Papadopoulos, Christophe Sigaud, Pavel Stejskal, Sarah Storey, Jan Troska, François Vasey CERN PH-ESE-BE

Outline Versatile Link ● Introduction ● Component testing ● TOSA, ROSA ● Transceiver design ● PCB versions, Latch ● Transceiver testing ● Future work ● Summary TWEPP 2011 Versatile Transceiver - Development Status 2

Versatile Link Project ● ● ● Optical layer linking front-end to back-end up to 150 m distant. Bi-directional @ 5 Gbps Two Point-to-point solutions ● ● Front-end pluggable module Rad-hard front-end ● 850 nm Multimode ● 1310 nm Single-mode TWEPP 2011 ● ● Versatile Link Joint Project Proposal submitted to ATLAS & CMS upgrade steering groups in 2007 and endorsed in 2008 Project Kick-off: April 2008 ● ● Phase I: Proof of Concept (18 mo) Phase II: Feasibility Study (18 mo) (Consolidation) Phase III: Pre-prodn. readiness (18 mo) Versatile Transceiver - Development Status 3

Versatile Transceiver Versatile Link ● Based on SFP+ ● Industry standard ● Can support target speed: 5 – 10 Gb/s ● Customization ● Radiation-qualified commercial Laser and Photodiode ● Custom-designed radiation hard ASICs: GBLD and GBTIA ● Non-magnetic package: plastic LC latch ● Low mass VTRx prototype with commercial driver and EE laser TWEPP 2011 Versatile Transceiver - Development Status 4

Versatile Transceiver Specifications ● Versatile Link Specifications are available on EDMS ● ● Sub-components Entire module Example: specifications of the optical parts TWEPP 2011 Versatile Transceiver - Development Status 5

Testing Versatile Link Static: LIV and RIN Dynamic test as full module TO RO SA SA Dynamic: BER-> Sensitivity Radiation tolerance test: Jan Troska et al. “Single-Event Upset testing of the Versatile Transceiver ” See poster #133 TWEPP 2011 Versatile Transceiver - Development Status 6

TOSA Tests – LIV curve Agilent 8163 B/81495 A ILX Lightwave LDC-3714 B ● ● Verify static characteristics of the laser Measure threshold current and the slope efficiency TWEPP 2011 Current source Versatile Transceiver - Development Status Versatile Link Receiver DUT 7

TOSA Tests – Relative Intensity Noise ● Versatile Link By measuring the intrinsic noise of the DC-biased laser we can extract important device parameters ILX Lightwave LDC-3714 B Agilent 8163 B/81495 A Agilent N 9020 A Current source Receiver Spectrum analyser DUT TWEPP 2011 Versatile Transceiver - Development Status 8

GBTIA ROSA Versatile Link ● GBTIA was assembled by commercial partner with 2 PIN photodiode types ● In. Ga. As, 60 um with AR coating for 1310 SM and 850 MM operation ● Ga. As, 70 um for 850 MM ● We tested 10 devices of each type at 4. 8 Gb/s TWEPP 2011 Versatile Transceiver - Development Status 9

GBTIA ROSA ● ● ● Versatile Link 60 um In. Ga. As meets requirements at 1310 nm with SMF 60 um In. Ga. As marginally meets requirements at 850 nm with MMF 70 um Ga. As meets requirements at 850 nm with MMF TWEPP 2011 Versatile Transceiver - Development Status 10

Printed Circuit Board Design Versatile Link ● Different VTRx versions require different boards ● Commercial laser driver + edge emitter laser ● Commercial laser driver + VCSEL ● GBLD ASIC + edge emitter laser ● GBLD ASIC + VCSEL ● VTTx (2 x VCSEL) ● Manufacturing in CERN and in an external company ● No major issues Commercial driver + Edge Emitter Laser TWEPP 2011 Commercial driver + VCSEL Versatile Transceiver - Development Status 11

Printed Circuit Board Simulation Versatile Link ● Optimizing layout using simulator Pre-layout tools (pre-layout) ● Design verification (post-layout) ● ASIC designers can use PCB model for more realistic simulations ● Difficulties: still lacking good models of laser drivers and VCSELs Post-layout TWEPP 2011 Versatile Transceiver - Development Status 12

Latch Design ● ● ● Versatile Link Provides mechanical support for PCB, TOSA and ROSA Ensures good optical connection to/from TOSA/ROSA and LC optical connector Prototypes made using 3 D prototyping techniques ● Easy to make variants for different ● TOSA/ROSA dimensions Radiation tolerance of material used to be proven ● Also investigating alternative materials & processes TWEPP 2011 Versatile Transceiver - Development Status 13

VTRx Performance – ONET 8501 V + MM VCSEL Parameter OMA Normalization OMA/300 u. W Eye Height/(0. 6*OMA) ER ER/3 1/Tr (1/Tr)/(1/70 ps) 1/Tf (1/Tf)/(1/70 ps) 1/Tj (1/Tj)/(1/0. 25 UI) 1/Dj (1/Dj)/(1/0. 12 UI) Note: Bit rate = 4. 8 Gb/s, UI = 208 ps 8 m. A 1. 19 1. 24 1. 33 1. 73 1. 59 3. 27 22. 88 10 m. A 12 m. A 1. 48 1. 25 1. 76 1. 70 1. 52 3. 39 12. 93 1. 76 1. 26 2. 31 1. 88 1. 45 3. 28 6. 60 Versatile Link Normalized eye diagram parameters. Higher values represent better performance. Values smaller than 1 mean that the spec is violated. TWEPP 2011 Versatile Transceiver - Development Status 14

VTRx Performance – ONET 8501 V + SM VCSEL Parameter OMA Normalization OMA/300 u. W Eye Height/(0. 6*OMA) ER ER/3 1/Tr (1/Tr)/(1/70 ps) 1/Tf (1/Tf)/(1/70 ps) 1/Tj (1/Tj)/(1/0. 25 UI) 1/Dj (1/Dj)/(1/0. 12 UI) Note: Bit rate = 4. 8 Gb/s, UI = 208 ps 8 m. A 0. 88 1. 26 0. 95 1. 38 1. 05 2. 07 6. 49 10 m. A 12 m. A 1. 07 1. 28 1. 18 1. 38 1. 02 2. 12 5. 22 1. 25 1. 27 1. 43 1. 06 1. 88 2. 78 Versatile Link Normalized eye diagram parameters. Higher values represent better performance. Values smaller than 1 mean that the spec is violated. TWEPP 2011 Versatile Transceiver - Development Status 15

VTRx Performance – ONET 1101 L + EEL Parameter OMA Normalization OMA/300 u. W Eye Height/(0. 6*OMA) ER ER/3 1/Tr (1/Tr)/(1/70 ps) 1/Tf (1/Tf)/(1/70 ps) 1/Tj (1/Tj)/(1/0. 25 UI) 1/Dj (1/Dj)/(1/0. 12 UI) Note: Bit rate = 4. 8 Gb/s, UI = 208 ps 30 m. A 35 m. A 40 m. A 1. 27 1. 05 1. 09 2. 13 1. 81 2. 77 1. 49 1. 05 1. 30 2. 14 1. 78 2. 91 2. 63 1. 70 1. 06 1. 56 2. 17 1. 74 2. 99 2. 87 Versatile Link Normalized eye diagram parameters. Higher values represent better performance. Values smaller than 1 mean that the spec is violated. TWEPP 2011 Versatile Transceiver - Development Status 16

VTRx Performance – GBLDv 3 + MM VCSEL Parameter OMA Normalization OMA/300 u. W Eye Height/(0. 6*OMA) ER ER/3 1/Tr (1/Tr)/(1/70 ps) 1/Tf (1/Tf)/(1/70 ps) 1/Tj (1/Tj)/(1/0. 25 UI) 1/Dj (1/Dj)/(1/0. 12 UI) Note: Bit rate = 4. 8 Gb/s, UI = 208 ps 4 m. A 1. 96 1. 09 1. 54 1. 10 0. 92 1. 21 0. 93 5 m. A 2. 27 1. 26 1. 91 1. 18 0. 90 1. 26 0. 97 Versatile Link 6 m. A 2. 55 1. 35 2. 25 1. 63 0. 87 1. 18 0. 90 Normalized eye diagram parameters. Higher values represent better performance. Values smaller than 1 mean that the spec is violated. TWEPP 2011 Versatile Transceiver - Development Status 17

VTRx Performance – GBLDv 3 + EEL Parameter OMA Normalization OMA/300 u. W Eye Height/(0. 6*OMA) ER ER/3 1/Tr (1/Tr)/(1/70 ps) 1/Tf (1/Tf)/(1/70 ps) 1/Tj (1/Tj)/(1/0. 25 UI) 1/Dj (1/Dj)/(1/0. 12 UI) Note: Bit rate = 4. 8 Gb/s, UI = 208 ps 16 m. A 20 m. A 24 m. A 1. 08 1. 29 1. 07 0. 89 0. 80 1. 01 1. 03 1. 13 1. 30 1. 13 0. 86 0. 77 0. 98 0. 86 1. 17 1. 29 1. 14 0. 83 0. 75 0. 96 0. 86 Versatile Link Normalized eye diagram parameters. Higher values represent better performance. Values smaller than 1 mean that the spec is violated. TWEPP 2011 Versatile Transceiver - Development Status 18

Future work Versatile Link ● Investigate options ● SM VCSEL vs EEL ● Ga. As vs In. Ga. As PIN for MM applications ● Environmental tests ● Repeat magnetic field tests ● Conduct EMC/EMI tests ● Thermal tests ● Work on LC latch variants ● Finish and test dual transmitter design (VTTx) ● Integrate new generations of ASICs into the design TWEPP 2011 Versatile Transceiver - Development Status 19

Conclusion Versatile Link ● Successfully tested TOSA and ROSA components ● Identified candidate components for all flavors ● PCBs are ready for almost all variants ● Dual transmitter version will be ready soon ● Designed, manufactured and tested several VTRx prototypes ● Good performance has been demonstrated ● Boards are available for system integrators ● Ready to move on to Phase III TWEPP 2011 Versatile Transceiver - Development Status 20

Versatile Link TWEPP 2011 Versatile Transceiver - Development Status 21

TOSA Tests – Relative Intensity Noise Versatile Link Spectral data Correction: removal of thermal and shot noise Fitting Extracted parameters: fr and Γd TWEPP 2011 Versatile Transceiver - Development Status 22

Printed Circuit Board Performance VTRx input return loss TWEPP 2011 Versatile Link VTRx performance comparison Versatile Transceiver - Development Status 23

Latch Performance Parameter OMA Normalization OMA/300 u. W Eye Height/(0. 6*OMA) ER ER/3 1/Tr (1/Tr)/(1/70 ps) 1/Tf (1/Tf)/(1/70 ps) 1/Tj (1/Tj)/(1/0. 25 UI) 1/Dj (1/Dj)/(1/0. 12 UI) Note: Bit rate = 4. 8 Gb/s, UI = 208 ps w/o latch Versatile Link /w latch 1. 05 1. 14 1. 35 1. 99 1. 66 2. 77 2. 61 1. 31 1. 12 1. 32 2. 08 1. 65 3. 29 4. 01 Normalized eye diagram parameters. Higher values represent better performance. Values smaller than 1 mean that the spec is violated. TWEPP 2011 Versatile Transceiver - Development Status 24

Short ? It depends … Versatile Link ~35 ps TWEPP 2011 Versatile Transceiver - Development Status 25

Laser Modulation vs OMA Versatile Link Example: assuming Rout = 50, Rload = 70, the current divider in the collector results in ± 0. 29 x. Itail through Rload TWEPP 2011 Versatile Transceiver - Development Status 26