The third coupler example is that of a basic vertical coupler using an on-chip Si wire and a III-V hetero-materials laser source. The purpose of the device is to make an electrically pumped light source on a silicon platform and to make the device. The third coupler example is that of a basic vertical coupler using an on-chip Si wire and a III-V hetero-materials laser source. The purpose of the device is to make an electrically pumped light source on a silicon platform and to make the device more manufacturable by only patterning on the Si wafer platform. In this process, both the waveguide a. In actuality, the fabrication of good couplers is often a difficult process. Part of the difficulty is a result of the extreme sensitivity of directional couplers to the exact value of the coupling coefficient, which makes them difficult to fabricate reproducibly by standard lithographic techniques. In fact, even slight variations in etch depth and. Several approaches have been developed to make a more reliable and robust coupler technology. One obvious possibility is to make an active coupler by electro-optical tuning or post-process trimming. Of course, this approach raises the complexity and cost of the entire fabrication process and the final device. A second approach is to use a vertical.
