Title:
【発明の名称】超高速論理デバイス
Document Type and Number:
Japanese Patent JPH0769557
Kind Code:
B2
Abstract:
Combinatorial (Boolean) logic functions are provided by ultrafast optical logic devices which utilize soliton trapping between two optical signals propagating in a birefringent fiber. The logic devices are three terminal devices having orthogonally polarized soliton input signals and a single output signal. Optically filtering the output from the fiber permits the desired combinatorial logic operation to be performed on the input optical signals. Logic operations include AND, exclusive-OR, NOT, and NOR functions. In operation, the devices exhibit phase insensitivity, low switching energy, high contrast ratio between output logic levels, and cascadability. In one embodiment of the invention, a first optical signal and a second optical signal are optically coupled into the principal axes of a birefringent fiber. A Fabry Perot etalon centered at the center frequency of both the first and second signals is utilized to realize a exclusive-OR operation whereas centering the etalon on the frequency related to the spectral shift caused by soliton trapping realizes an AND operation.
Inventors:
M.N.Islam
Application Number:
JP25204890A
Publication Date:
July 31, 1995
Filing Date:
September 25, 1990
Export Citation:
Assignee:
A&T Corporation
International Classes:
G02F1/35; G02F3/00; G06E1/00; H01L39/22; H03K19/14; (IPC1-7): G02F3/00; G02F1/35; G06E1/00; H03K19/14
Attorney, Agent or Firm:
Masao Okabe (2 outside)
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