We demonstrated the inverse design of a multifunctional silicon photonic device named wavelength demultiplexing power splitter (WDPS) which can realize dual-band (1310/1550 nm) demultiplexing and 1:1 power splitting simultaneously. We proposed a novel two-step hybrid binary-analog optimization (TH-BAO) method that combines two distinct optimization techniques: direct binary search (DBS) for binary pixel-state optimization and particle swarm optimization (PSO) for analog pixel-position optimization. Compared with the traditional DBS method, the TH-BAO method achieves comparable optimization performance with a reduction of the total simulation runs by 29.2%. The inverse-designed WDPS achieves insertion losses of 0.76 dB and 1.19 dB, as well as channel crosstalks of -17.96 dB and -11.20 dB at 1310 nm and 1550 nm, respectively. Furthermore, the dual-band functionality of our device can efficiently support the development of next-generation passive optical networks.
In recent years, high-speed visible light communications (VLC) have been identified as an essential part of communication technologies for next generation wireless network owing to the increasing demand for faster data transmission speeds. VLC offers the unique advantages of ultra-high data rate, unregulated and secure channels, free of EM interference. Compared with the LED-based VLC system, laser-based photonic systems are promising for compact, droop-free, and high-speed white lighting and VLC applications, making them ideal alternatives for building ultra-fast optical wireless data link. Besides the potential for achieving high data rate free-space communication links, i.e., the Li-Fi network, laser based VLC, or visible laser light communication (VLLC) technology can also enable underwater wireless optical communications (UWOC) for many important applications. This paper summarizes the recent progress in high-speed laser based VLC devices and explore VLLC-enabled networks, systems, and applications. I will describe state-of-the-art VLC transmitter and receiver technologies. Novel designs to overcome the inherent limitations will be covered. Finally, the innovations in VLC systems for industrial IoT, vehicular communication, and underwater wireless networks applications will be discussed.
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