Byte-wide optical backplane switching method

Abstract

A byte-wide optical switch and switching method are provided. The optical switch includes a first set of ports for receiving in parallel an optical byte of data, and multiple second sets of ports each capable of outputting in parallel the optical byte of data. An array of optical switching elements is disposed between the first set of ports and the multiple second sets of ports. The array of optical switching elements direct the optical byte of data in parallel from the first set of ports to at least one second set of ports of the multiple second sets of ports. The switching elements may comprise micro-electro mechanical system (MEMS) devices, each having a position controllable reflective surface. Thin film optical filters can be provided on the reflective surfaces for wavelength selective switching.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is a continuation of co-pending U.S. patent application Ser. No. 10 / 697,829, filed Oct. 30, 2003, and published May 5, 2005 as U.S. Patent Publication No. US / 2005-0095000 A1, entitled “Byte-Wide Optical Backplane Switch and Switching Method”, by DeCusatis et al., the entirety of which is hereby incorporated herein by reference.TECHNICAL FIELD [0002] The present invention relates generally to optical data transfer, and more particularly, to an optical switch for a computing subsystem which receives and switches in parallel an optical byte of data from at least one first set of ports to at least one second set of ports. BACKGROUND OF THE INVENTION [0003] The S / 390 Computing System offered by International Business Machines Corporation currently uses a 12 channel data bus known as a self-timed interface (STI) for many applications within the system architecture. For example, STI is typically used as a connector between a me...

AI Technical Summary

Benefits of technology

[0006] Fiber optic communication systems offer significantly enhanced bandwidth compared with copper interconnections, so they are a viable approach for interchip, intercard, and system backplane interconnections.

[0009] In another aspect, a device is provided which includes a substrate having multiple layers disposed thereon. The multiple layers include a first optical waveguide layer having at least one first set of ports for receiving in parallel an optical byte of data, and a second optical waveguide layer having multiple second sets of ports capable of outputting in parallel the optical byte of data. The multiple layers further include an optical switching element layer for facilitating directing of the optical byte of data in parallel from the at least one first set of ports of the first optical waveguide layer to at least one second set of ports of the multiple second sets of ports of the second optical waveguide layer.

Problems solved by technology

Radiated electromagnetic noise from copper STI interfaces and external noise coupled into the interfaces from other components in the system pose significant design challenges.

As data rates increase and bus lines become longer, these problems become more significant making it difficult to maintain system integrity along the bus.

As computer systems become larger and more complex, the amount of data which can be conveyed over an electrical backplane or over copper wire interconnections between processor chips, via for example a memory bus adapter and I / O subsystem, becomes a bottleneck to improved performance.

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