| 摘要 |
<p>An electro-optic modulator is disclosed in the form of a compound waveguide device (10) having a channel waveguide (60, 160, 260) in optical proximity to an elongate waveguide (30) propagating an optical signal therein. The channel waveguide (60, 160, 260) includes a coupling surface through which optical energy is evanescently coupled to or from the optical signal propagating in the elongate waveguide (30). The channel waveguide (60, 160, 260) is shaped to confine distribution of the optical energy therein along axes transverse to the axis of propagation of the optical energy. Transverse diffraction of the optical energy within the channel waveguide (60, 160, 260) is thereby limited. The channel waveguide (60, 160, 260) is formed from an electro-optically active material, and modulation of the optical signal propagating in the elongate waveguide is effected using the evanescent coupling effect between the two waveguides. In one embodiment, the elongate waveguide (30) is a side-polished fiber-optic waveguide.</p> |
