WDM technology-based optical communication and networking equipment accounted for the largest market share of ~69% in 2021. The development of ROADM-based WDM networking solutions is one of the emerging trends in the global optical networking and communications market. Key factors for the growth of WDM technology are higher bandwidth, easy configuration, better security, and duplex transmission. Owing to this, WDM technology is expected to continue to hold the largest market share during the forecast period.