Tunable DWDM transceivers allow users to adjust their wavelengths according to actual network needs. This results in a reduction in the number of spare transceivers used to avoid DWDM network failures and provides flexibility to accommodate growing networks. Tunable modules on the market mainly include 10G SFP+, XFP and 25G SFP28 tunable DWDM transceivers. So, is there any difference between tunable 10/25G and standard 10/25G DWDM modules? This article will explain their differences in terms of how they work, applications, and cost, and then use the FS box to show how to change the wavelength of a DWDM tunable transceiver.

Working principle
Each fixed wavelength DWDM module is designed with a specific wavelength, so the module can only be deployed in network nodes that require the corresponding wavelength. For example, a C21 wavelength SFP+ transceiver will only work with the C21 wavelength port on the DWDM MUX. But with a tunable SFP+ fiber optic module, the user can use the module to connect any port of the same DWDM MUX through a fiber optic cable, because the wavelength of the tunable transceiver can be adjusted to suit different port wavelengths.

Application
Due to different working principles, standard DWDM optical modules are traditionally deployed in networks that require few changes or additions of channels. While tunable DWDM optical transceivers are envisioned as backup units for networks that need to change wavelengths as business grows.

Cost
Indeed, a single fixed wavelength transceiver costs less than a tunable DWDM module. But in the long run, tunable optics reduce OPEX. For example, in a large 10G SFP+ DWDM system with hundreds of nodes of different wavelengths, the user must provide up to hundreds of spare standard DWDM SFP+ transceivers to avoid unnecessary failures, which will greatly increase operational costs. In this case, tunable optics can help reduce the need for inventory of DWDM SFP+ transceivers, thereby reducing costs and maximizing network flexibility.

Tunable dwdm is indeed a very professional product for many people. If you have any questions during use or purchase, you can contact us as soon as possible, and we will be happy to provide you with the most professional answers and services.