As the complexity of optoelectronic integrated circuits (OEICs) develop, the need for an accurate and efficient compatible simulation environment that supports both photonics and electronics becomes increasingly critical. This paper addresses the demand by proposing an approach that leverages Verilog-A language to build equivalent circuit models and compact models for photonic devices. Passive components, including couplers and waveguides, are modeled using compact models. Active components, such as CW lasers, are realized through the adoption of equivalent circuit models. Additionally, a depletion-type phase shifter is separated in two parts: the electrical part for parasitic parameters and the p-n junction are presented with RC components, while the optical characteristics, influenced by electrical modulation, are achieved through the use of compact models. The proposed compatible system design scheme, which consists of Verilog-A models, can be analyzed in the frequency-domain using EDA software. The simulation results demonstrate a mean absolute percentage error (MAPE) of less than 0.003% when compared to those obtained from commercial interoperable design software. Therefore, this study effectively addresses the challenge of incompatible design and simulation for OEIC, and providing strong evidence that OEIC design can be achieved in a unified EDA platform.
An ultra-compact 1310 / 1550 nm wavelength demultiplexer based on multimode interference (MMI) coupler assisted by subwavelength gratings (SWGs) is proposed. Two parallel SWG-based slots are inserted into the MMI section symmetrically. Equivalent refractive index and width of the SWG are designed properly to reduce the device length while keeping a low insertion loss (IL) and high extinction ratio (ER). In this way, the device length shrinks to 34.48 μm. The performance when the device working as a multiplexer and as a demultiplexer are both investigated. From the transmission spectrum, ILs of <0.24 dB, ERs of larger than 15.2 dB and broad 1-dB bandwidths of larger than 90 nm are obtained for the two wavelengths.
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