Optical waveguides – Directional optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2003-01-17
2008-09-23
Pak, Sung (Department: 2874)
Optical waveguides
Directional optical modulation within an optical waveguide
Electro-optic
C385S008000, C385S016000, C385S030000, C385S039000, C385S129000
Reexamination Certificate
active
07428348
ABSTRACT:
An electro-optical switch implemented in coupled photonic crystal waveguides is disclosed. The switch is proposed and analyzed using both a finite-difference time-domain (“FDTD”) method and a plane wave expansion (“PWM) method. The switch may be implemented in a square lattice of silicon posts in air, as well as in a hexagonal lattice of air holes in a silicon slab. Switching occurs due to a change in the conductance in the coupling region between the photonic crystal waveguides, which modulates the coupling coefficient and eventually causes switching. Conductance may be induced electrically by carrier injection or optically by electron-hole pair generation. The electro-optical switch has low insertion loss and optical crosstalk in both the cross and bar switching states.
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Prather Dennis W.
Sharkawy Ahmed
Shi Shouyun
Soref Richard A.
Pak Sung
Petkovsek Daniel
RatnerPrestia
University of Delaware
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