100G QSFP28 20km BIDI

Q: How many types of 100G QSFP28 optical modules are there?

A: Currently, there are several types of 100G optical modules in the market, including 100G QSFP28 SR4, 100G QSFP28 PSM4, 100G QSFP28 CWDM4, 100G QSFP28 LR4, 100G QSFP28 ER4, and 100G QSFP28 ZR4. Relevant parameters can be viewed in the table below.

Q: Can QSFP28 and QSFP+ optical modules be compatible?

A: QSFP28 optical modules cannot be used in QSFP+ ports. Similarly, SFP+ optical modules cannot operate in SFP ports, and QSFP28 optical modules also cannot be used in QSFP+ ports. Regarding the principle of mixing different rate optical modules with switches, it essentially depends on the type of fiber used and the port of the switch. The module port must match the shape of the switch port, and the switch port rate must be equal to or greater than the rate of the optical module being used. To ensure normal network transmission, it is necessary to ensure that both ends are connected with the same connector without compatibility issues. QSFP28 ports can use QSFP+ optical modules, but QSFP28 optical modules cannot transmit data at 100Gbps on QSFP+ ports.

Q: Is it necessary to clean the connectors of QSFP28 SR4 optical modules? If so, how should it be cleaned?

A: Yes, dust and contaminants can accumulate on the connectors of QSFP28 SR4 optical modules, potentially causing a decrease in transmit optical power. To ensure transmission stability, HuaXun Optical recommends cleaning the connectors each time they are disconnected and reconnected. A one-click MTP/MPO fiber pen cleaner is the best choice for cleaning QSFP28 SR4 optical modules.

Q: What is the interface type of 100G QSFP28 optical modules?

A: 100G QSFP28 optical modules use MPO/MPO (multi-fiber) interface connectors, typically 12-core or 24-core, depending on the module type.

Q: How are multi-mode and single-mode distinguished in 100G QSFP28 optical modules?

A: Multi-mode QSFP28 modules typically use OM3 or OM4 fiber, suitable for short distances. Single-mode modules use LC-LC or LC interfaces, coupled with single-mode fibers, supporting long-distance transmission.