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This article describes a low power optical I/O subsystem for a Josephson junction (cryogenic) processor. The processor modulates light provided by an external source to generate the outgoing optical signal.
English (United States)
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Optical I O Subsystem for Josephson Junction Processor
This article describes a low power optical I/O subsystem for a Josephson
junction (cryogenic) processor. The processor modulates light provided by an
external source to generate the outgoing optical signal.
A processor using Josephson junction devices should have extremely fast
cycle times and should dissipate very little heat. However, such a processor
requires a cryogenic environment which severely limits permissible power
dissipation in the I/O subsystem.
Fig. 1 is a block diagram of an I/O subsystem for a Josephson junction
processor. Incoming optical data is received at an optical to electric converter 10
through an optical fiber 12. Outgoing data in the form of an electronic modulating
signal is applied over lead 14 to an electrical-to-optical converter 16. A constant
power light source 18, such as an injection laser, is located outside of the
processor's cryogenic environment. Unmodulated light is directed through an
optical fiber 20 into converter 16 where it is modulated by the signal provided
through lead 14. A modulated optical signal is transmitted from the I/0
subsystem through an outgoing optical fiber 22.
Fig. 2 illustrates a suitable electrical-to-optical converter 16. Unmodulated
light is provided through optical fiber 20 to an optical coupler 24 connecting fiber
20 to an optical waveguide 26. Optical waveguide 26 leads to a switching device
28 capable of selectively passing incoming light to...