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NTT and the Tokyo Institute of Technology (Tokyo Tech) have developed an all-optical switch that operates in the ultrafast regime with a response time in the femtosecond (fs) range and with energy consumption in the femtojoule (fJ) range. To achieve both speed and energy efficiency in the switching, the researchers combined a nanosize optical waveguide based on plasmonics with graphene.
All-optical switches are expected to operate faster than switches that are electrically controlled. However, the switching energies of all-optical switches are relatively high. For ultrafast information processing, optical components need to be densely integrated in photonic circuits, and the energy consumption of each device must be low. The…READ MORE