Allen J. WHANG^* and Shih-Min CHAO^†

National Taiwan University of Science and Technology, NO. 43, Sec.4, Keelung Rd., Taipei, 106, Taiwan, R. O. C

(Received April 22, 2003; Accepted July 7, 2003)

We propose a new structure containing multimode interference waveguides with partial nonlinear Kerr-like material whose function is like a phase shifter for all-optical logic gates. It has the advantages of compactness and insensitivity to relative phase difference between the incident beams. In this paper, we analyze the structure by finite difference time domain method and demonstrate such logic gates as AND, NOT and XOR logics.

Key words: all-optical logic devices, multimode interference, optical Kerr effect, optical waveguides, optical data processing

^*E-mail address: whang@et.ntust.edu.tw
^†E-mail address: m9002302@mail.ntust.edu.tw