Introduction: Selecting 850nm VCSEL SFP modules that reliably transmit 10Gbps over 300m multimode fiber with power efficiency and multi-vendor compatibility is key for scalable telecom networks.   In today’s crowded communication hardware market, the abundance of choices can cloud decision-making for network engineers and system integrators. When searching for the right sfp module, distinguishing between countless options from diverse sfp module manufacturers becomes a challenge. The need to balance high performance, ease of integration, and long-term reliability in a fiber optic environment pushes professionals to weigh every detail carefully. This context sets the stage for exploring how specific fiber sfp modules , especially those operating at 850nm with VCSEL technology, fit into the fast-paced demands of telecom access networks where speed, stability, and adaptability are paramount.   Evaluation criteria for 850nm VCSEL transceivers in telecom infrastru...