Optical phase gives rise to the most fundamental and defining features of light. Light waves interfere constructively or destructively with each other, depending on their relative phase relation. Based on interferometry, precise detections of optical phase have enabled transformative discoveries and technologies including the observation of gravitational waves, biomedical pathology diagnosis, coherent optical communications, imaging, and computer vision. Hence, leveraging the advanced photonic technology to build highly efficient phase detection systems on-chip has been at the forefront of integrated optical informatics. However, current integrated phase detection architectures require the integration of interferometers that must be accurately calibrated and flexibly programmed to offset the undesired fabrication imperfections. Such interferometer hardware takes up the majority of the footprint budget and hinders the scalability of the detectable information space on-chip. In this project, a novel multimode phase detection scheme for silicon photonics will be investigated. Utilizing the mode degree of freedom in silicon photonic multimode waveguides, the on-chip photonic hardware planning will be minimal, without a deliberate hardware design of an interferometer. Rather, the phase detection will be carried out through numerical optimization and digital signal processing. The advantages of this novel detection scheme in terms of device footprint and detection speed will be ide