Non Hermetic Fiber Optic Transceivers for Space Applications. Chuck Tabbert VP of Sales & Marketing inc.

Transcription

1 Non Hermetic Fiber Optic Transceivers for Space Applications Chuck Tabbert VP of Sales & Marketing inc.com (505)

2 Agenda Motivation X80 QM Space Product Overview Space Qualification Plan Radiation Testing completed 2

3 Motivation Fiber Optic Market Acceptance In Avionic & Space Platforms Barriers to Acceptance Lack of a standard qualification plan Lack of standardized components Flight Heritage Horror stories using COTS Lack of Concept of Operations (CONOPS) on using advanced transceiver capabilities Forces Supporting Acceptance Data Rates and Bandwidth SWAP C EMI resistance

4 Ultra Comm Overview Photonic applications in harsh environments Spun out of Peregrine Semiconductor in 2005 Core competencies Circuit Design Packaging Manufacturing High speed, mixed signal optoelectronics for high reliability process development and installation Product History (Multi channel Transceivers) Shipped into space program (2.5 Gbps/channel with 4 channels) Shipping into F 35 program (2.5 Gbps/channel with 4 channels) Qualifying new product into F 35/E2 D programs and space 12.5 Gbps/ch with 4 channels 4

5 X80 QM Fiber Optic Transceiver Functionality Optical to electrical conversion Independent data channels: 4 transmit + 4 receive Data Rate: 10 Mbps to 12.5 Gbps per channel (up to 50 Gbps aggregate each direction) Single cable and connector Optical Link Margin (allowable loss in box to box fiber cable): 21 db at 5 Gbps Digital interface: diagnostic monitoring & adjusting laser power over temperature data source/ sink X80-QM transceiver PCB edge connecter microcontroller high speed electrical 8 fiber cable on PCB digital interface (diagnostics/laser control) 8 fiber cable (box to box) PCB X80-QM transceiver data source/ sink 8 fiber cable on PCB high speed electrical microcontroller digital interface (diagnostics/ laser control) 5

6 X80 QM Fiber Optic Transceiver Packaging Surface mount QFN package Solders to PCB Fiber optic connector interface Multi fiber connector (up to 12) 50 micron multi mode fiber Ribbon or loose bundle cable Multi fiber termination: MTP or MT Single fiber termination X80-QM (top) X80-QM (bottom) transceiver fiber cable fiber termination termination options MTP MT cm 6

7 Size, Weight and Power Summary Component Size Weight Power Transceiver 6 fiber cable (ribbon w/ MTP) 12 x 12 mm 2 (PCB) 5 mm (height) 2 g 850 mw 0.5 x 3 mm 2 3 g NA MTP Connector 40 x 15 x 8 mm 3 3 g NA 12 fiber cable with OFNR jacket 3 mm diameter 8 g/meter NA MTP-to-MTP bulk head connector fiber cable (ribbon from transceiver) Box-to-box cable Xiaodan "Linda" Jin, Melanie N. Ott, et. al., Space Flight Qualification on a Multi-Fiber Ribbon Cable and Array Connector Assembly, SPIE Photonics for Space Environments XI,Vol. 6308, August

8 Rugged Vertical Connector (RVCON ) Assembly Two piece molded assembly + strain relief boot RVCON material passed outgas testing 8

9 Temperature Stability of RVCON Interface Active temperature cycling: 40 to 100 C < 1 db loss Excellent opto mechanical stability observed Temperature (c) Power(mW) Power(mW) Current (ma) Current (ma) Power(mW) Power(mW) (6 curves) (6 curves) (6 curves) Current (ma) Current (ma) (9 curves) # of Temperature Steps Power(mW) (8 curves) Power(mW) (8 curves) 0.2 (Ch 1) Current (ma) Current (ma) 9

10 Signal Integrity Tx calibrated to meet power, ER, and mask Excellent Tx eyes over full temp range

11 X80 QM Construction Fiber Connector Frame Fiber connector interface with lenses Transparent carrier Non-Volatile Memory / ADC ASIC 1 x 4 VCSEL and PIN arrays Transceiver ASIC Ceramic Interposer QFN ASIC package Assembly before frame attach 11

12 Quad Transceiver ASIC 10 Mb/s 12.5 Gb/s per channel Total power dissipation: ~850 mw Die size: 4.85 mm x 1.5 mm Digital (SPI) Interface SEU/SET hardened logic & registers Built in test measurement system Rx input power and amplitude Tx input amplitude (electrical) Tx output power VCSEL temperature VCSEL voltage Bias / Supply / DACs Quad Transmitter Quad Receiver 10.3 Gbps TX 10.3 Gbps RX 12

13 NVM+ADC ASIC Fiber optic transceivers require calibration Adjust laser drive currents over temperature Provide calibrated telemetry information from sensors 1 K Byte One Time Programmable (OTP) Non Volatile Memory (NVM) 14 bit ADC read out of built in test signals Die size: 3.85 mm x 1.5 mm Power consumption: 2 mw 13

14 Emcore (now Sumitomo) VCSEL & PIN 14 Gbps operation 850 nm wavelength Wide commercial usage >100M/year Ethernet Fibre Channel VITA 17.2 (databus) USB 3.0 VCSEL array PIN detector array 14

15 VCSEL Reliability Emcore has published reliability reports over the past 10 years Continual increase in reliability thru better VCSEL construction The most recent study 39,629 VCSELs over 662 wafers 1% failure of 183 use years at 70 C and 7mA VCSEL current. Developed aging factor model to correlate to user environment and handling (ESD) Chun Lei, et. al, Emcore VCSEL Failure Mechanism and Resolution, Proc. of SPIE Vol. 7615,

16 Qual Plans: Avionic & Space 16

17 Transceiver Qual Plans 2013 Two concurrent quals space & avionic Avionic Qual 3 manufacturing lots (consumes 118 functional devices) Lot 1 & Lot 2 stressing evaluations Temp Cycle ( 2000 hours), Reflow Solder Test Autoclave (96 hours), Salt Atmosphere High & Low Pressure Exposure Rapid Pressure Differential Exposure 85/85 Humidity (2000 hours) Steady State Life (1000 hours) Temp Cycle (on PCBs 1000 hours) Mechanical Shock Random Vibration HAST (264 hours) Lot 3 Qual MIL PRF Class L (non hermetic hybrid over 55 to 125 C temp range) PEM transceiver X80-J QFN transceiver X80-QM X80 QM qual similar to Lot 3, but adapted for space 17

18 Radiation Testing Results 18

19 Radiation Testing 12.5G Transceiver & NVM/DAC ASICs Prime Contractor performed SEU/SEFI testing 12.5 G Tx and Rx ASICs November, 2011 at Berkeley Facility No register upsets observed No latch up observed Isolated errors in bit stream Prime Contractor estimate for 1 bit error every 5 years ASICs account Prime Contractor plans to use for longterm LEO GEO applications TID to 1 Mrad showed no effect on test chips OPAMP DAC/ADC TID on 12.5G Tx and Rx to 119 Krad No change observed TID on NVM to 300 Krad with no effect SEU/SEFI 12.5 Gbps Tx and Rx 19

20 Summary Improvements in miniaturization and productization The QFN packaged transceiver leveraging avionic production line Space upgrade path for the connectorization The RVCON system is a low loss and wide temp connector system Aggressive stress tests and qualification in 2013 Improvements to performance 5 X improvement in data rate (2.5G > 12.5G) 1.8 X improvement in power consumption (1.5 W > 0.85 W) Launch power: 0 dbm Rx sensitivity: 21 dbm 21 db link margin 6 db increase Improved optical coupling and circuitry New extensive telemetry for transceiver and fiber health Space Customers requested removal of micro controller The NVM/ADC ASIC is complete and fully tested for functionality NVM and ADC test circuits have passed 300 Krad(Si) 3 samples 20

21 Back ups 21

22 Rugged Vertical Connector (RVCON TM ) Flip-chip Passive Alignment of Wafer Process Components: CTE Matched Materials Lens Guide Sealed Lens TRX ASIC VCSEL Interposer RVCON (Expanded Beam Optical Interface) expansion cleat Lens Guide Sealed Lens TRX ASIC expansion cleat Wafer bonded seals Strain relief boot CORE Interposer VCSEL Bottom of RVCON CORE Top (lens guide) male cleats complementary expansion slots 22

23 X80 QM Fiber Optic Transceiver Internal Components Two ASICs Transceiver ASIC quad laser driver and receiver Non volatile memory ASIC contains calibration data and ADC Quad VCSEL array Quad PIN array No other electrical components All passives on customer board (supply filtering, AC coupling, etc) 23

24 Transmitter Optical Power Key to Link Margin Photodetectors respond to particles Charge generated by particles are indistinguishable from photocurrent Isolated 0 s are flipped to 1 s Reduces the effective receiver sensitivity Link margin is gained by increased optical power at transmitter Efficient optical coupling is important for space applications Higher data rate can improve BER More bits per particles Error correction coding of 8b/10b data streams can improve BER Reference Paul W. Marshall, et. al. Particle Induced Bit Errors in High Performance Fiber Optic Data Links for Satellite Data Management IEEE TRANSACTIONS ON NUCLEAR SCIENCE, VOL. 41, NO. 6, DECEMBER