Holographic Drive and Media Developments at InPhase Technologies

Transcription

1 Holographic Drive and Media Developments at InPhase Technologies Tom Wilke InPhase Technologies 2000 Pike Road, Longmont, Colorado Phone: FAX: Presented at the THIC Meeting at the National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder CO August 21-22, 2007 August 2007 InPhase Technologies 1

2 Holographic Drive and Media Developments at InPhase Technologies Agenda Introduction to InPhase How recordable drive works Drive descriptions Basic Data Channel ROM Technology August 2007 InPhase Technologies 2 August 2007

3 InPhase Technologies created as spin-off from Lucent Bell Labs Photopolymer media development InPhase History H-ROM drives and media Rewritable drives and media Volume drive and media shipments Drive Tester Revenue Media Revenue RECORDABLE 2-chemistry material Write strategies Zerowave Media Manufacturing Data Channel Rewritable Media ROM Replication / Polytopic Multiplex Temperature compensation 515 Gb/in2 density 350 Gb/in2 density Prototype Drive Media Interchange August 2007 InPhase Technologies 3

4 Recordable & Rewritable Roadmap recordable 2007 Gen 1 Gen 2 Gen 3 tapestry300r MB/sec tapestry800r MB/sec tapestry1600r MB/sec rewritable Gen 1 Gen 2 tapestry300rw MB/sec tapestry800rw MB/sec rw-drive backward read compatible with r-media r-drive backward read compatible for 3 generations 24 months between generations August 2007 InPhase Technologies 4

5 Bringing Tapestry 300R to Market from technology. to solutions Optics Drive Manufacturing OEMs Strategic Components SLM Laser Confidential Detector Chemicals Media Media Manufacturing Material Manufacturing Service/Support Test Equipment Robotics Software & Solution Integrators VARS August 2007 InPhase Technologies 5

6 How does holographic data storage work? August 2007 InPhase Technologies 6

7 How does Holographic Storage Work? How are data recorded? The bits are encoded into an array of > 1 million pixels (page) recorded into the media via a laser. Recording Data Reference Beam Storage Medium Data to be stored How is capacity achieved? Hundred pages are recorded in the same location in the media, each with it s own angular address. Laser Reading Data Spatial Light Modulator Data Pages How are transfer rates achieved? Reference Beam Detector The entire array (page) is exposed for ~ 2 milliseconds. The media does NOT move while data are being recorded or recovered. Laser Recovered Data August 2007 InPhase Technologies 7

8 Density with a Polytopic Filter Traditional minimum book spacing Book spacing with a polytopic filter August 2007 InPhase Technologies 8

9 EVT architecture - write λ/2 CAMERA PHASE MASK CAMERA S L M POLYTOPIC FILTER λ/2 isolator + shutter Rm λ/2 50 mw disk 25 Rm 407nm August 2007 InPhase Technologies 9

10 EVT architecture - Read λ/2 CAMERA S L M POLYTOPIC FILTER λ/2 isolator + shutter Rm λ/2 50 mw disk 25 Rm 407nm August 2007 InPhase Technologies 10

11 Key InPhase System Components InPhase designed tunable laser 50mW nm Custom SLM, 1000 fps,1216x1216 Custom CMOS camera, 485 fps, Custom shutter, 500Hz 1710x1696 pixels August 2007 InPhase Technologies 11

12 Holographic Recording Media August 2007 InPhase Technologies 12

13 Media 130mm dia. disk and cartridge similar to MO Double-walled cartridge with locked shutter for light-tightness Access from both sides of media Media manufacturing tilt tolerances same as DVD Flatness of media package assured by ZeroWave process 1.0mm substrates w/ar coatings 1.5mm Tapestry holographic polymer Rotation servo pattern (inside data ID) Magnetic hub August 2007 InPhase Technologies 13

14 EVT Drives 13 EVT drives have been in test for about 12 months Completed EVT Test Plan Capacity/format 4 corner environmental Shock and vibration Transfer rate Used for NAB, ODS, in-house testing Continuing to test EVT drives Algorithm development Data reliability Firmware debug Media testing and validation August 2007 InPhase Technologies 14

15 EVT Video August 2007 InPhase Technologies 15

16 DVT Drives August 2007 InPhase Technologies 16

17 DVT Drive Architecture Top Hood PCBA PCBA Cage Left Side Loader OMA Fan FRU 5 major subsystems Loader Laser FRU Electronics OMA Enclosure Laser FRU Bottom Right Side Bezel August 2007 InPhase Technologies 17

18 DVT Architecture Unchanged from EVT: Phase conjugate, polytopic, angle multiplexed. Conjugator mirror (& readout double pass through media) Linear moving phasemask, imaged onto SLM New for DVT: Field-Replaceable Unit (FRU) Laser Eliminated camera focus mechanics by introducing over-sampling design Pitch corrector (allows greater system tolerances) Improved tangential servo method Tracking pattern embedded onto media Improved mechanical tolerances for shock sway space Designed air cooling path above OMA operating temperature improvement Improved cure path efficiency Incorporated manufacturability improvements August 2007 InPhase Technologies 18

19 The Guts of the Drive Pitch Corrector OMA Frame Optical Divider Diffuser Top Deck August 2007 InPhase Technologies 19

20 DVT Build Assembly Stations August 2007 InPhase Technologies 20

21 Pre-DVT Build Completion Shown above: Opto-Mechanical Assembly Loader Laser Field Replacable Unit Top Deck Hood Board Base and Frame Card Cage Media August 2007 InPhase Technologies 21

22 Pre-DVT Build Completion Hood board up showing flex circuits August 2007 InPhase Technologies 22

23 Basic Data Channel August 2007 InPhase Technologies 23

24 Holographic Data Channel Write Hardware and Software Versions Encode FPGA Formatter SLM Optical Path LASER Randomize data Bit-wise dispersal across page Reserve blocks for servo and channel ECC encoding Read LASER Optical Path Camera Buffer RAM Laser Controller Over-sampled Detection Un-disperse bits ECC decoding Camera FPGA Channel Filtering Buffer RAM Decode Buffer RAM Outer Codes August 2007 InPhase Technologies 24

25 The Detector Alignment Problem SLM Image Oversampled Pixel-Matched High SNR 4X bandwidth (Nyquist) High SNR Low SNR August 2007 InPhase Technologies 25

26 Resampling Method Oversampled Image Measure Alignment FIR Filter Resampled Image August 2007 InPhase Technologies 26

27 Data Page Highly randomized data, codewords distributed all through each page for robustness Header (multiple redundant copies) Optical alignment features Reserve blocks (For calculating page metrics) August 2007 InPhase Technologies 27

28 Measure Alignment - Quiver Method Pattern Match Alignment Map Known Blocks August 2007 InPhase Technologies 28

29 Resampling Method Oversampled Image Measure Alignment FIR Filter Resampled Image August 2007 InPhase Technologies 29

30 Linear Resampling Method δ y δ x Apply FIR coefficients to detector window Pixel Image of Interest Detected Values August 2007 InPhase Technologies 30

31 August 2007 InPhase Technologies 31 Determining Coefficients Find MMSE coefficients over many neighborhoods: minimized is where w w w d d d n dˆ d I I I I I I ˆ ˆ ˆ n,16 n,1 2,1 1,16 1,2 1,1 = M O M L M SNR: Solution ( ) d I I I w T T 1 = ( ) ( ) ( ) ( ) = + = = = = d d std d d std d mean d d mean d Q ˆ ˆ ˆ ˆ

32 Choose Oversampling Ratio 6 SNR vs. SNR Oversampling vs. Ratio Ratio log 10 (Q) δ X = δ Y = 0.5 δ X = δ Y = 0.25 δ X = δ Y = Linear Oversampling Ratio August 2007 InPhase Technologies 32

33 Resampled Image Example 4/3 oversampled image Original Detector Image Resampled Image August 2007 InPhase Technologies 33

34 Summary Technology implemented in fourth generation (DVT) Latest improvements lead to viable product Data channel oversampling allows larger margins Partners, suppliers, and customers in place InPhase positioned to deliver robust products August 2007 InPhase Technologies 34

35 Thank you August 2007 InPhase Technologies 35