WDM and OTN are two different communication technologies, the differences are as follows:

WDM (Wavelength Division Multiplexing): WDM is an optical transmission technology that uses optical signals of different wavelengths to multiplex multiple data streams on one optical fiber to increase the transmission capacity of the optical fiber. WDM technology combines optical signals of different wavelengths for transmission, so it requires the use of multiple lasers and detectors, as well as complex fiber optic networks.

OTN (Optical Transmission Network System): OTN is an optical transport network technology that uses a series of standardized protocols and technologies, including wavelength division multiplexing, cross-connect, digitalization, etc., to improve the transmission performance and reliability of optical fiber networks. OTN uses digital signals for transmission, divides data into fixed-length frames, and can add error correction codes and management information to frames to ensure the reliability and integrity of data transmission.

Therefore, WDM and OTN are two different technologies. WDM is mainly used to increase the transmission capacity of optical fibers, while OTN is a complete optical transmission network technology used to improve the transmission performance and reliability of optical fiber networks. In practical applications, WDM is usually used for long-distance optical fiber transmission, while OTN is more used in data centers, metropolitan area networks and other occasions that require high bandwidth and high reliability.

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