Electro-absorption optical modulator and method for fabricating the same

摘要

An electro-absorption optical modulator, where a waveguide length of the absorption layer is denoted by L, a light confinement coefficient thereof is denoted by GAMMA , and a performance factor of the absorption layer at an applied voltage V to an absorption layer is denoted by K(V), has design parameters selected so that a relationship ¦K(V) - GAMMA . L¦ ≤ 0.005 cm is satisfied in a continuous operation range of a quenching ration TAtt. The waveguide length L is preferably optimized so as to satisfy K(V) ≒ GAMMA . L in the operation range. <IMAGE> <IMAGE>