University of Twente Student Theses
Collision Avoidance for Trench Coupling using Photonic Probe-Chip Reflections
Heijink, J.J. (2024) Collision Avoidance for Trench Coupling using Photonic Probe-Chip Reflections.
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| Abstract: | The world of photonics is rapidly changing, and as the development of Photonic Integrated Circuits (PICs) progresses, they become more widely used. The increase in production volume results in an increasing need for an automatic testing solution. Like conventional ICs, PICs are produced on a wafer. By doing the testing while the PICs are still on a wafer, testing capacity can be increased. To test a PIC, electrical and optical probes will connect to the PIC. The electrical probes touch electrical pads on the chip surface, where as the optical probes are brought close to, but do not touch optical ports. Some types of optical ports are located on the sides, and trenches can be etched on the wafer to allow access to these ports. Optical coupling with these ports is called trench coupling. However, trench coupling comes with challenges for coupling since the chip is still on the wafer, especially when trying to avoid collision. In this thesis, a method for collision avoidance is presented. When light crosses an interface between two materials with a different refractive index, a part of the light will always be reflected. In most coupler designs, these reflections also occur. The method uses these reflections that occur in the probe-air-pic interfaces to estimate distance. In this way, distance can be measured with the probe itself, so no extra hardware or calibration between probe and sensor is needed. The use of this sensing technique for collision avoidance is promising. Various experiments using a single fiber or a fiber array with a prism representing a probe resulted in a repeatable response. The accuracy in these experiments was limited by the encoder, resulting in an uncertainty around 1-5 μm. For further research, the use of a different encoder is recommended. |
| Item Type: | Essay (Master) |
| Clients: | IMS, Almelo, Netherlands |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 33 physics, 50 technical science in general, 52 mechanical engineering |
| Programme: | Systems and Control MSc (60359) |
| Link to this item: | https://purl.utwente.nl/essays/99783 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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