ORGANIC WAVEGUIDE TYPE OPTICAL MODULATOR AND OPTICAL COMMUNICATION SYSTEM HAVING ORGANIC WAVEGUIDE TYPE OPTICAL MODULATOR AS COMPONENT

摘要

PROBLEM TO BE SOLVED: To provide an organic waveguide type optical modulator technique which can be driven by a low voltage and is low in cost and high in speed.;SOLUTION: Modulation electrodes 111 to 113 on both sides are dropped to the ground and microwaves are impressed to a central modulation electrode 112 to impress electric fields of reverse directions to DASTs 181 and 182 existing in respective branched optical transmission lines, by which a double phase change is generated and lower voltage driving is made possible. A progressive wave type electrode is formed by imparting terminal resistance to the modulation electrode 112. The structure capable of eliminating the influence of capacitance and dealing with high-speed optical modulation is thereby obtained. The surfaces of the modulation electrodes 111 to 113 are provided with conductive nanotubes 19. If each of the modulation electrodes 111 to 113 is formed of two layers; a layer 20 not containing the nanotubes and an electrode including the nanotube from which the nanotube 19 protrudes to the surface, resistance control is made easier and impedance matching can be more easily taken.;COPYRIGHT: (C)2005,JPO&NCIPI