Optical waveguides – Having nonlinear property
Patent
1990-11-07
1992-01-07
Healy, Brian
Optical waveguides
Having nonlinear property
385 1, 385 38, 385123, 385 27, 36471501, 307407, 307409, 359135, 359184, 359188, 359326, G02B 626, H03K 1780, H04J 300, G02F 100
Patent
active
050784641
ABSTRACT:
An optical logic device based on the time-shift-keying architecture is described in which digital logic functions are realized by applying appropriate signal pulses to a nonlinear shift or "chirp" element whose output is supplied to a dispersive element capable of supporting soliton propagation. In an optical fiber realization of the optical logic device, two orthogonally polarized pulses are supplied to the combination of a moderately birefringent fiber acting as the nonlinear chirp element and a polarization maintaining fiber acting as the soliton dispersive delay element having a anomolous group velocity dispersion at the signal wavelengths of interest. A nonlinear frequency shift is created in one of the pulses in the former element through cross-phase modulation and, in turn, the frequency shift is translated into a temporal shift of the affected pulse in the latter element. These devices operate at switching energies approaching 1pJ.
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AT&T Bell Laboratories
Healy Brian
Ranieri Gregory C.
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