Light coupling and modulating means

摘要

A light coupler and modulator for an optical waveguide is formed using a slab of optically transmissive material having a higher index of refraction than the waveguide. The slab has tapered ends for receiving and transmitting light from and to the waveguide. An electrode is disposed over the slab for the application of modulating signals to the slab. When used as a coupler, the ends of two waveguides to be coupled also have tapered ends that are overlapped by the slab with the tapered ends of the slab extending beyond the taper of the waveguides.