DWDM fine wavelength division multiplexing optical module introduction

To put it simply, the DWDM optical module is the same as other optical modules in terms of working principle and basic functions, which are all electrical-optical-electrical. It is an optical module using dense wavelength division multiplexing (DWDM) technology. For this type of optical module of dense wavelength division multiplexing, by using multiple wavelengths as the carrier, using the broadband and low loss characteristics of single-mode fiber, the light of different wavelengths is coupled into the single-core fiber for transmission, and there are 40 commonly used channels. available for selection.

In addition, the DWDM optical module uses a cooling laser, which can support hot swapping. The interface must comply with the optical interface standard recommended by ITU-T. Generally, a denser channel spacing is used. The channel spacing also has 0.4nm, 0.8nm and 1.6nm and other different intervals, can support the longest transmission distance of 100km, mainly used in long-distance optical synchronous digital transmission network, and can also be used as a solution to the expansion of line bandwidth.

So what are the classifications of DWDM optical modules? DWDM generally has two application forms: open and integrated. It is mainly divided into five package types, namely DWDM SFP, DWDM SFP+, DWDM XFP, DWDM X2 and DWDM SFP28 optical modules, among which there are three most commonly used optical modules: the first type, 1.25G/2.5G DWDM SFP optical modules are mainly It is suitable for interconnection in 1G Fibre Channel environment and Gigabit Ethernet; the second, 10G DWDM SFP+ optical module is mainly used for 10G optical cable, router or server interface, other links, etc. It is the best choice for 10G bandwidth applications. Solution; The third, 10G DWDM XFP optical module is mainly used in 10G Ethernet, 10G Fibre Channel and DWDM network applications.