Type: Single-mode optical module is suitable for long-distance transmission; multi-mode optical module is suitable for short-distance transmission. The optical module (opTicalmodule) is composed of optoelectronic devices, functional circuits and optical interfaces. Correctly distinguishing single-mode and multi-mode. Understanding the differences between single-mode and multi-mode optical modules is crucial for selecting the right one for your specific network application. For the 1G SFP module, it is primarily divided into the following two categories: Optical SFP Transceiver Optical transceiver connection RJ45. So, do you know how to distinguish whether an optical fiber module is single-mode or multi-mode? Next, Splicermarket will teach you a few ways to distinguish between multi-mode fiber modules and single-mode fiber modules. First, we can look at the wavelength parameters of the optical module.