Ultra-fast optical logic devices

Details Ultra-fast optical logic devices Ultra-fast optical logic devices

1989-09-25

1990-06-12

Sikes, William L.

Coded data generation or conversion

Digital code to digital code converters

Tree structure

350 9616, 341137, G02B 626

Patent

active

049327399

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.

REFERENCES:
A. Hasegawa et al., Appl. Phys. Lett., vol. 23, No. 3 (1973).
N. J. Doran et al., J. Opt. Soc. Am. B., vol. 4, No. 11 (1987).
C. R. Menyuk, Optics Letters, vol. 12, No. 8, pp. 614-616 (1987).
M. N. Islam et al., Optics Letters, vol. 13, pp. 518-520 (1988).
C. R. Menyuk, J. Opt. Soc. Am. B, vol. 5, No. 2, pp. 392-401 (1988).

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