Optical wireless communication (OWC) has emerged as a promising technology for high-speed indoor wireless access. Recently, mirror-based intelligent reflecting surface (IRS) has been introduced to OWC to enhance communication performance. However, traditional radio frequency IRS channel models fail to adapt optical features of OWC, and existing ideal optical models neglect some physical imperfections, leading to inaccurate performance evaluations in real-world deployments. To address this problem, this paper proposes a modified and more realistic IRS channel model. Distinct from ideal IRS channel, the proposed model employs a differential summation method to mathematically incorporate both g... More >