The latest article on silicon-based hybrid integrated microwave photonic filters by Yuansheng Tao, a doctoral student at the Center, and Haowen Shu, a postdoctoral fellow, "Hybrid integrated high-performance microwave photonic filter with switchable response " was recently published in the journal Photonics Research. In this study, researchers integrated indium-phosphorus (InP)-based distributed feedback semiconductor laser chip and monolithic integration of dual-drive Mach-Zehnder modulator, high-Q micro-ring and germanium-silicon detector silicon-based active chip in method of micro-optics, and successfully developed fully integrated microwave photonics filters (Figure 1).

Fig. 1. Hybrid integrated microwave photonic filters

This microwave photonic filter demonstrates excellent filtering performance while achieving high levels of integration: a wide frequency tuning range of 3-25 GHz, a narrow filter linewidth of 360 MHz, and a high out-of-band rejection ratio of >40 dB. In addition, the filtering response can be switched flexibly and quickly between band-pass filtering and band-reject filtering with a switching response time of only 48 microseconds. Using this device, the researchers also successfully verified the microwave signal filtering effect in two different types of application scenarios, namely interference suppression and channel selection (Figure 2).

Fig. 2. Verification of filtering effect in real application scenarios

The above work was supported by the National Natural Science Foundation of China, the National Key R&D Program, and the Key R&D Program of Beijing Science and Technology Commission. Shenzhen Microsource Photonics Technology Co., Ltd. provided strong support in device packaging.

Link to the paper: https://doi.org/10.1364/PRJ.427393