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Two-dimensional fiber array with integrated topology for short-distance optical interconnections Makoto Naruse 1),2), Alvaro Cassinelli 3), and Masatoshi.

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Presentation on theme: "Two-dimensional fiber array with integrated topology for short-distance optical interconnections Makoto Naruse 1),2), Alvaro Cassinelli 3), and Masatoshi."— Presentation transcript:

1 Two-dimensional fiber array with integrated topology for short-distance optical interconnections Makoto Naruse 1),2), Alvaro Cassinelli 3), and Masatoshi Ishikawa 3) 1: Ultrafast Photonic Network Group Communications Research Laboratory, Japan E-mail: naruse@crl.go.jp 2: Japan Science and Technology Corporation (JST), PRESTO 3: Dept. Information Physics and Computing, University of Tokyo

2 Contents 1.Interconnection fabric 2.Wave-guide-base, direct implementation of interconnection topology 3.Interconnection decomposition 4.Experimental fabrication 5.Summary and future plans

3 Optical Interconnection fabric / switching fabric LSI Optical Interconnection fabric / Switching fabric Inter Chip, Inter-board Optical interconnection Multistage architecture

4 … … All optical Optoelectronic An example: Omega network OE Computation EO Optical interconnect w/o OEO Regularly interconnected multistage architecture

5 Wave-guide-base, direct implementation of interconnection topology … … OE Computation EO Optical interconnect w/o OEO Two-dimensional fiber array Configure the interconnection topology directly by positioning the input and output end of the wave- guides Input Output All optical Optoelectronic

6 Design considerations Two-dimensional (2D) parallelism Focus on Permutation network (such as perfect shuffle) Scalability Module reusability (Permutation reusability) Alignment difficulty: Both input and output end Theoretically more volume efficient than free-space equivalent Other remarks Out of scope of this paper Y.Li, et. al., “Volume-consumption comparisons of free-space and guided-wave optical interconnections”, Appl.Opt. 39 (2000), 1815

7 Example1: Omega network 01230123 45674567 8 9 10 11 12 13 14 15 Messy topology Poor scalability Poor reusability Permutation= Perfect shuffle 2D direct implementation

8 Example 2:Indirect Binary n-Cube Network Permutation= Butterfly and perfect shuffle Several kinds of different interconnection topology are used

9 Interesting fact Perfect shuffle and butterfly permutation can be made out of the following three types of elemental permutations: Row, Column, and Diagonal permutations Column permutationRow permutation Diagonal permutation

10 Before decomposition Direct implementation 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Node assignment: Scan mapping Perfect shuffle

11 Interconnection decomposition Row permutation Column permutation Diagonal permutation Decompose 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 6 14 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Perfect shuffle

12 Interconnection decomposition Column permutation Diagonal permutation 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Decompose 3 10 3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Butterfly

13 shuffle Processor arrays (exchange switches and more) Row permutation  90 º Overall Omega Network Column permutation Diagonal permutation

14  (2)  (3)  (4)  -1 (4) Processor arrays (exchange switches and more) Row permutation  90 º Column permutation Diagonal permutation Overall Indirect Binary n-Cube Network

15 Two holder prototypes: Zirconium, SiO 2 Pitch: 250±5  m Multimode graded index fibers: NA=0.21 (core 50  m, cladding 126  m) Transmission loss: 3dB/km Length: 30 cm Prototype fiber module: Preliminary 4x4 array 3 mm 2 mm 5 mm Embedded interconnection topology

16 Pitch uniformity 0 2 4 6 8 10 12 14 16 244246248250252254256 Zirconium Pitch (  m) Number of link 245  m-255  m Ave. 250  m Std deviation 2.0  m 246  m-254  m Ave. 250  m Std deviation 1.5  m SiO 2 Pitch (250  m)

17 Input Output (CCD image) No relay optics Interconnection example VCSEL array Fiber module input Input Output

18  x  50  m 0 0.05 0.1 0.15 0.2 0.25 -105-90-75-60-45-30-1501530456075 X (microns) Exit power (a.u) xx Alignment tolerances (half peak power)  y  70  m Transmission efficiency / Alignment tolerance Transmission efficiency Max. transmittance 38.45% 0 5 10 15 20 25 30 35 40 45 678910111213 VCSEL driving current (mA) Transmittance (%) 38.45 9.59.5 LED regime LASER regime

19 Summary and future plans Wave-guide-base, direct implementation of 2D parallel interconnection topology Interconnection decomposition for scalability and reusability 2D fiber array with interconnection topology was demonstrated Future plan: Theoretical foundation for interconnection decomposition and total system design Higher-density 2D interconnect System demonstration

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