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Now that we've covered each one, YXFiber will walk you through the key differences. In terms of data rate: SFP is generally for modules under 3G; SFP+ is for modules running 6G to 16G; SFP28 is for 25G/32G modules; QSFP+ is for 40G/56G modules; and QSFP28 is for 100G modules. In terms of built-in components: SFP, SFP+, and SFP28 use a single laser and a single detector, while QSFP+ and QSFP28 use 4-channel laser and detector arrays. Also, the interface protocols differ across all five form factors.
YXFiber was founded in 2015 and is headquartered in Optics Valley, Wuhan, China. At the beginning of its establishment, it focused on R&D, production and sales of optical fiber modes. Its main products include SFP, SFP+, QSFP, 1X9 and other series of optical transceivers, DAC AOC cables and media converters. YXFiber's continuous technological innovation and achievement transformation in the field of optical communications has been recognized as a high-tech enterprise in Wuhan.
Most modern switches with SFP+ ports can accept 1.25G SFP modules and auto-negotiate down to 1G. However, a 10G SFP+ module will not work in an SFP-only port. Furthermore, fiber optic modules—unlike copper RJ45 transceivers—do not support 10/100/1000 auto-negotiation; the vast majority run only at their rated speed. Even when an SFP+ port accepts a 1G module, three issues arise: the port's performance is severely capped, end-to-end latency increases by 15-20%, and network monitoring systems require extra configuration to correctly identify the actual speed.
The BIDI solution cuts fiber consumption by half, eliminating the need for additional cable laying or duct expansion. It is especially suitable for upgrading legacy campuses and residential FTTH networks where fiber resources are already saturated. YXFiber's gigabit single-fiber modules are sold as pre-paired units, reducing cabling, material, and labor costs by nearly 50% compared to dual-fiber configurations. With highly competitive unit pricing, these modules meet budget constraints for mid-to-small-scale projects.
The SR module operates at the 850nm band, a shorter wavelength that experiences less signal attenuation over multimode fiber. The LR module operates at the 1310nm band, a longer wavelength that enables lower loss and longer transmission distances over single mode fiber. The wavelength difference determines the fiber type and application scenarios they support — they are not interchangeable.
