In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which multiplexes a number of optical carrier signals onto a single optical fiber by using different wavelengths (i. This allows multiple channels of data to be transmitted simultaneously. He, and S. This collection encompasses a variety of research papers, conference proceedings, and technical articles that explore both foundational. ptical multiplexing techniques, wavelength division multiplexing (WDM).