1.Shanghai University;2.Shanghai Industrial μ Technology Research Institute;3.Shanghai Institute of Microsystem and Information Technology
在新型掺钪(Sc)氮化铝(Al1-xScxN)集成光学平台上设计了插入损耗低、传输通道谱线平坦的O波段四通道波分(解)复用器,并提出了优化方法。所设计的器件结构基于级联的马赫曾德尔干涉仪(MZI)滤波器,结合弯曲波导结构的定向耦合器改善波长敏感度。针对粗波分复用(CWDM)应用的特性,文章使用粒子群算法(PSO)提升器件性能优化的效率,通过调整器件结构的设计参数对四路通道的传输谱线质量进行优化。针对0%、9%、23%的掺Sc浓度,设计的解复用器表现出宽达约15.6 nm的1-dB带宽和小于0.1 dB的插入损耗,传输谱线呈“盒状”响应,各通道间串扰均优于-30.6 dB。
A 4-channel wavelength division (de)multiplexer with low insertion loss and flat-top transmission spectra is presented based on the novel scandium (Sc)-doped aluminum nitride (Al1-xScxN) photonics platform for the first time, and an optimization method is proposed. The designed multiplexers are based on cascaded Mach-Zehnder interferometer (MZI) filters, using directional couplers with curved waveguides to reduce wavelength dependence. Particle swarm algorithm (PSO) is adopted to increase the efficiency of device optimization according to the characteristics of coarse wavelength division multiplexing (CWDM) applications. The transmission quality of four channels is improved by adjusting the structure of the device. For Sc doping concentrations of 0%, 9% and 23%, the designed multiplexers have 1-dB bandwidths as wide as about 15.6 nm and negligible insertion losses of less than 0.1 dB, showing "box-like" responses. The crosstalks of four channels are less than -30.6 dB.