A travelling wave-type optical modulator

摘要

A travelling wave-type optical modulator has a supporting substrate (18) and a ferroelectric single crystalline layer (1A) adhered on the supporting substrate with an adhesive layer (3A). The ferroelectric single crystalline layer has thicker parts (5,8) and thinner parts (6) forming at least one ridge within the modulating region of the travelling wave-type optical modulator (20) as viewed in the cross section of the modulating region. Then, an optical waveguide (2) is formed in the thicker part of the ferroelectric single crystalline layer, and electrodes (11,21) for modulation are provided on the thinner part of the ferroelectric single crystalline layer.