| 摘要 |
NON-LINEAR OPTICAL LOGIC GATE An optical device comprises first and second optical waveguides (1,2) connected between respective output and input ports of first and second optical couplers (3,4). The first coupler has at least one input port and is adapted to couple optical signals received at the input port into its output ports in a predetermined coupling ratio. The second coupler has at least one output port and is adapted to couple optical signals received at each input port (7,8) into its output port in a predetermined coupling ratio. The first and second waveguides (1,2) define respective optical paths with substantially the same optical length. The waveguides (1,2) are fabricated from materials which exhibit soliton effects when optical pulses, at working intensities, are injected into the waveguies, such that the pulse propagation is dispersion dependent, whereby the portions of an optical pulse received at the input of the first coupler (3) are coupled into the waveguides (1,2) by the first coupler and arrive sychronously but phase shifted relative to one another at the second coupler (4) after travelling along the waveguides. The device may be configured to provide optical switching and logic functions. Figure 1 |
