Three-dimensional board-to-board free-space optical interconnects and their application to the prototype multiprocessor system: COSINE-III

Sakano, Toshikazu; Matsumoto, Takao; Noguchi, Kazuhiro

doi:10.1364/ao.34.001815

Cited by 41 publications

(13 citation statements)

References 3 publications

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“…The DH for the distributor directs 50% of the power toward the left and the right, respectively, equalizing power distribution in both directions by virtue of a 50/50% DH. In addition, the symmetric configuration of SHs satisfies (1) Further, because all remaining power at the th board and th board is coupled out through holograms, the final holograms at each end require 100% diffraction efficiency. With this conceptual basis, the output power in the th board is expressed as (2) To equalize power output to the receiver, the two power equations [(2) and (3)] must be equal.…”

Section: Characteristics Of the Centralized Optical Backplanementioning

confidence: 99%

“…There are two major approaches to the optical backplane to overcome this limitation. The free-space optical backplane bus system [1] uses free-space channels and diffractive optical elements (DOEs) to direct the signal beams. In the guided-wave optical backplane system [2], [3], optical beams travel by way of total internal reflection (TIR) within the waveguiding substrate, and DOEs are used as beamsplitter/deflectors.…”

Section: Introductionmentioning

confidence: 99%

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A method for rebroadcasting signals in an optical backplane bus system

Kim¹,

Han²,

Chen³

2001

J. Lightwave Technol.

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Abstract-A guided-wave optical backplane bus system intended for use in high-performance board-to-board interconnects is described. Its multiplexed polymeric holograms can implement optical signal broadcast between boards so that all boards share common optical channels. By introducing an active coupler to the doubly multiplexed hologram at the center board, signals received from any board can be rebroadcast to all other boards.We describe the design concepts for a centralized optical backplane and the resulting performance and assembly advantages over previously developed guided-wave and free-space optical backplane bus systems used for broadcasting signals. These advantages include equalized fan-out power, increased interconnect distance, and simpler fabrication.

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Section: Characteristics Of the Centralized Optical Backplanementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A method for rebroadcasting signals in an optical backplane bus system

Kim¹,

Han²,

Chen³

2001

J. Lightwave Technol.

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“…These architectures include waveguide bus systems{l], substrate-mode guided-wave bus systems implemented with waveguiding plates and holographic coupling elements [2,3], and free-space bus systems implemented through free-space optical interconnections [4].…”

Section: Introductionmentioning

confidence: 99%

<title>Characterization of a bidirectional optical backplane and performance enhancement with multi bus lines</title>

Kim

Chen

1999

Optoelectronic Interconnects VI

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The concept of a bi-directional optical backplane with multi-bus lines for a high performance system containing multichip module (MCM) boards, operating at 850 nm, is introduced. The backplane reported here employs VCSEL arrays and photodetector arrays as transceivers. Optical beams from a transmitter are fanned out by deflectors which are arrays of multiplexed polymer-based waveguide holograms, and then undergo total internal reflection inside a waveguiding plate, and fmally reach the target receiver arrays on the edge ofboards We have designed a bi-directional optical backplane for the data communications application in a nine-board system. Packaging related issues such as misalignment, crosstalk and signal to noise ratio have been studied for the reliable system based on the Gaussian beam approximation. By integrating 140j.tm-pitch (1D) or 25Optm-pitch (2D) VCSEL arrays, microlens arrays, and photodetector arrays into our design of backplane, we have demonstrated optical backplane with multi-bus lines and experimentally realized this architecture with 1D and 2D bus lines which greatly increase the bus bandwidth of the backplane. Frequency response of our devices shows a bandwidth of 2.5 THz, which is higher bandwidth. Eye diagrams up to 1 .5 GHz have been demonstrated with clear eyes.

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“…The packaging must be compact, manufacturable, reliable, cost-effective, and stable. While there are many reports on board-to-board optical interconnections [4]- [5], there are few on this issue [6].…”

Section: Introductionmentioning

confidence: 99%

Optical beam direction compensating system for board-to-board free space optical interconnection in high-capacity ATM switch

Hirabayashi

Yamamoto

Hino

et al. 1997

J. Lightwave Technol.

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In interconnections between bookshelf-assembled asynchronous transfer mode (ATM) switch boards, a large number of micro-optical signal beams can be optically interconnected by a beam direction compensating system using a vertical cavity surface emitting laser, an x-y beam positioning sensor and a beam deflector made of an adjustable liquid prism. This beam direction compensating system can suppress the decrease in coupling efficiency between transmitters and receivers to no more than 15%, even if boards are inserted and extracted repeatedly, and are shocked repeatedly at a high intensity of 100 G. The compensation is very fast (20 ms). Furthermore, various optical interconnections necessary for ATM switching networks can be achieved by beam deflectors of a liquid crystal microprism array. In this preliminary study, we fabricate no more than eightchannel optical interconnections. However, since one surface emitting laser diode can have many channels in a small area (64 channels per 4 mm 2 ) and the aperture of this adjustable liquid prism is wide (28 mm in diameter) and uniform, a huge number of optical interconnection channels will be is possible using this system.Index Terms-ATM printed circuit boards, light deflectors, liquid crystal (LC), optical interconnections, switching systems.

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Three-dimensional board-to-board free-space optical interconnects and their application to the prototype multiprocessor system: COSINE-III

Cited by 41 publications

References 3 publications

A method for rebroadcasting signals in an optical backplane bus system

A method for rebroadcasting signals in an optical backplane bus system

<title>Characterization of a bidirectional optical backplane and performance enhancement with multi bus lines</title>

Optical beam direction compensating system for board-to-board free space optical interconnection in high-capacity ATM switch

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