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.
We designed and demonstrated a silicon-on-insulator (SOI)-based multifunctional 1×4 multimode interference (MMI)waveguide that can be employed as a 1310/1550 nm wavelength demultiplexer and a 3-dB power splitter at the sametime. The direct binary search (DBS) algorithm is applied to inversely design and optimize the multifunctional MMI. Simulation results show that the insertion loss of our device is 0.67 and 0.50 dB for the 1310 and 1550-nmchannels, while the wavelength isolation values are up to 24 and 37 dB, respectively. The 3-dB bandwidth of our device is largerthan 350 nm, covering the whole O-band, C-band and L-band. Our MMI waveguide has an ultra-compact footprint of 5×2.5 μm2, which is more than one order of magnitude smaller than the conventional MMI-based demultiplexers orpower splitters.
A high-precision three-gas detection system based on non-dispersive infrared (NDIR) technique was designed to accurately detect multiple gas concentrations in a complex environment. This system consists of an infrared source, a quad channel pyroelectric detector, a signal processing circuit and an optical gas chamber. A multiplexed digital lock-in amplification algorithm based on MCU was realized to improve accuracy, it has low cost of multiplex, there is potential to be applied to the measurement of multi-channel data. And a compact gas cell with the size of 40mmx110mmx22mm was designed, in which the average optical path length is 475mm. Initial measurement was done to one channel for SF6 gas concentration, and the feasibility of gas cell structure and signal processing circuit was demonstrated.
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