We propose and investigate in detail a novel physical concept of a highly miniaturized (up to two working wavelengths) planar optical resonant splitter/coupler with a switching element comprising a photonic molecule (PM) pair dispersing input optical fluxes in multiple. We propose and investigate in detail a novel physical concept of a highly miniaturized (up to two working wavelengths) planar optical resonant splitter/coupler with a switching element comprising a photonic molecule (PM) pair dispersing input optical fluxes in multiple. Currently, Wavelength Division Multiplexing (WDM) technology is advancing rapidly and demonstrating strong momentum, with highly promising future potential. Optical Wavelength Division Multiplexing technology enables a fiber optic to carry multiple signals simultaneously by transmitting several. Provided in the present disclosure are an optical module, comprising a circuit board and a light-receiving component, wherein the light receiving component comprises a substrate, an optical fiber adapter, a light-receiving chip, a refractive member and a light-splitting assembly; the. The optics module is comprised of Si photodiodes, optical components, and current-to-voltage conversion circuit. Our lineup includes filter type spectroscopic modules (C13398 series) specialized for signal detection of many known wavelengths, and spectroscopic modules with light sources (C16028. The Transmitter Optical Sub Assembly (TOSA) is responsible for the emission of light. Its primary function entails converting electrical signals into optical signals. This assembly comprises a light source, such as a laser diode or a semiconductor light-emitting diode (LED), an optical interface, a. The present invention relates to an optical wavelength measurement device using an absorptive optical fiber-based double optical fiber filter module, an optical sensor system comprising same, and an optical measurement method. The optical wavelength measurement device for measuring signal light. ISO 9001 certified since 2011, Wavelength Opto-Electronic is a leading provider of high-precision optical solutions for various industries including semiconductors, biomedicine, monitoring and surveillance, energy power batteries, consumer electronics, LiDAR, autonomous driving, and many more.