Optical memory device and optical circuit using optical memory device
AssigneeHitachi, Ltd.
InventorsYasuo Imanishi, Shingo Ishihara, Tomoyuki Hamada, Atsushi Kakuta
Life of this patent
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Abstract
An optical memory device having at least two nonlinear optical media connected together by at least two light paths. This optical memory device can make high-speed light pulse signal processing which cannot be realized by the conventional electric switch.
Claims12
An optical memory device having at least two nonlinear optical media E and F and at least two light paths for connecting said nonlinear optical media E and F, comprising:
- a first incident light for driving said optical memory device;
- a second incident light for writing said first incident light into said optical memory device,
- a third incident light for reading out the written information in said optical memory device, wherein said first and second incident lights are incident to said nonlinear optical media E and said third incident light is incident to said nonlinear optical media F.
An optical memory device having at least two nonlinear optical media E and F connected together by at least two light paths, wherein said nonlinear optical media exhibit optical bistability, and if a threshold of one nonlinear optical medium E is represented by I.sub.c1, a threshold of another nonlinear optical medium F by I.sub.c2, an amount of information light incident to said nonlinear optical medium E of said optical memory device by I.sub.set, an amount of driving light incident to said nonlinear optical medium E of said optical memory device by I.sub.source, an amount of light exiting from said medium E and then incident to said nonlinear optical medium F by I.sub.source1, an amount of light incident to said nonlinear optical medium F, exiting from said medium F and then incident to said nonlinear optical medium E by I.sub.source2, and an amount of reading light incident to said nonlinear optical medium F to read said written information from said optical memory device by I.sub.reset, the following conditions can be established:
- I c1>I source, I c1>I set, I c1>I source2,
- I source+I set.gtoreq.I c1, I source+I source2.gtoreq.I c1
- I c2>I source 1, I c2>I reset
- I source1+I reset.gtoreq.I c2.
Dependencies are inferred from the claim text.