How To Choose 40G QSFP+ Optical Module？
40G QSFP+ optical module refers to the transmission rate of 40G, and the package of this optical module is QSFP+. 40G optical module has four independent full-duplex transceiver channels, each channel of the transceiver rate of 10G, thus forming a 40G transmission rate, Walsun Optical Communication (Walsun) will introduce the 40G QSFP + optical module what types are there.
IEEE organization for 40G QSFP + optical module to develop a variety of transmission protocols, common are: 40G BASE-SR4, 40G BASE-LR4, 40G BASE-BiDi, 40G BASE-ER4, etc., the interface type of these optical modules, transmission distance, working wavelength are not the same, the following is the parameter list of 40G optical modules for you reference.
| PN | Data Rate | Package | Wavelength
(nm) |
Distance | Connector | Patch cord |
| EQ854X-3MCD01 | 40G | QSFP+ | 850 | 150m | MPO | OM4 |
| EQ854X-3MCD04 | 40G | QSFP+ | 850 | 400m | MPO | OM4 |
| EQ314X-3MCD2(PSM4) | 40G | QSFP+ | 1310 | 2km | MPO | OS2 |
| EQxx4X-3LCD10 | 40G | QSFP+ | CWDM | 10km | Dual LC | OS2 |
| EQxx4X-3LCD40 | 40G | QSFP+ | CWDM | 40km | Dual LC | OS2 |
As shown in the table above, 40G SR4, 40G ER4 and 40G BIDI are multimode optical modules that require the use of OM3/OM4 fiber optic patch cords for transmission, which are suitable for equipment interconnection within the data center due to the short transmission distance; 40G SR4, 40G eSR4 and 40G PSM4 interface types are MPO interfaces, this type of interface can not only achieve 40G link connection, but also use MPO-LC patch cord to achieve 40G link and 10G link connection; LX4, LR4, ER4 interface type is LC, need to be used with single-mode fiber OS2 patch cord, the transmission distance is more than 2KM, the farthest is 40KM.
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