Lin Chang

Lin Chang’s main research direction is integrated optics. Through developing heterogenous integration technology based on wafer bonding and low-loss waveguide processes compatible with various materials, he has broken the limitation of material types integrated on photonic chips, increasing the number of materials that can be integrated on a single chip to more than four​.

This technology enables the full integration of different functional components in optical systems, greatly enhancing the integration of photonic chips. Based on this platform, Lin proposed new on-chip light source structures. Through the self-injection locking mechanism between different materials, ultra-narrow linewidth integrated lasers and microcomb were achieved, significantly reducing the noise of on-chip light sources and enhancing parallelism​.

Based on the multi-material integrated photonic chip platform technology, Lin achieved large-scale parallel photonic chip systems, addressing the bottleneck of information processing efficiency in traditional photonic chips. In data center optical modules, using microcombs as multi-channel light sources to replace traditional lasers, he increased the number of channels in the optical module to 20, achieving a total rate of 2T/s, more than five times higher than previous levels.

Lin and his collaborator also explored parallel computation based on photonic chips, achieving a fully chip-based optical processor for convolutional neural networks with a computing density of 1 TOPS mm-2, providing a potential solution for the large-scale production and popularization of future optical computing. Additionally, he actively promotes the application of multi-material photonic chip-related technologies.