Specifications Model S-SFP-GE-LH40-SM1550 (Huawei Part No. 02317347) Product Type Optical Transceiver Module Form Factor eSFP (enhanced Small Form-factor Pluggable) Data Rate 1. 25 Gbps (Gigabit Ethernet) Transmission Distance Up to 40 kilometers (1550 nm, single-mode fiber). An optical module is a component that completes electrical/optical conversion on an optical network. Figure 3-198 shows the structure of an optical module. Figure. The eSFP-GE-SX-MM850 optical module is a Huawei Gigabit multimode optical module with DOM/DDM support, which is packaged in an SFP package with a center wavelength of 850 nm.