Q: What are the package types of 40G optical modules?
A: The package types of 40G optical modules are CFP and QSFP+. Because of the large size of CFP, the mainstream 40G optical modules on the market are QSFP+ packages.
Q: Can QSFP 40G LR4 CWDM/PSM optical modules be used for 4x10G transmission?
A: QSFP 40G LR4 CWDM optical module cannot be used for 4x10G transmission, because its four wavelengths are transmitted on a pair of single-mode fiber jumpers with an LC duplex interface, and it takes a lot of time to split the wavelengths. However, the QSFP 40G LR4 PSM optical module can be used for 4x10G transmission because it uses a parallel fiber patch cord with an MTP/MPO interface, which can be split into 4 pairs of fibers for transmission.
Q: What is the difference between QSFP+ PSM IR4 optical module and QSFP+ PSM LR4 optical module?
A: Both of these 40G optical modules have MTP/MPO optical fiber ribbon interfaces – optical modules integrated with four channels, the only difference is their transmission distance. The maximum transmission distance of 40G PSM LR4 on single-mode fiber patch cords is 10 kilometers, while the maximum transmission distance of 40G PSM IR4 is only 1.4 kilometers.
Q: What is the difference between QSFP+ CWDM LR4 optical modules and QSFP+ LX4/ER4 optical modules?
A: The biggest difference between them is the difference in transmission distance. QSFP+ CWDM LR4 has a maximum transmission distance of 10 kilometers on single-mode fiber patch cords, LX4 CWDM QSFP+ supports up to 2 kilometers of transmission distance on single-mode fiber patch cords, and only 150 meters on multi-mode fiber patch cords The maximum transmission distance of the QSFP+ 40G ER4 optical module can reach 40 kilometers on the single-mode fiber patch cord.
Q: Which 40G optical modules can be used for 4x10G transmission?
A: 40GBASE-SR4, 40GBASE-CSR4, 40GBASE-PLR4 and 40GBASE-PLRL4 optical modules all use parallel technology, with 4 channels in each direction, all of which can be applied to 4x10G transmission.
Q: What cables do QSFP+ PLR4 and QSFP+ PLRL4 optical modules need to be used with?
A: They all need to be used with single-mode fiber patch cords with MTP-12 APC connectors.
Q: What is the transmission performance of the 40GbE PLRL4 standard?
A: 40G Parallel LR4 Lite (PLRL4) 10GBASE-LRL standard, the transmission distance using single-mode fiber is 1 km. In addition, 40GbE PLRL4 optics can support 4 independent 10G-LR connections by using 4x10G mode, connecting a splitter cable, or a single-mode fiber box.
Q: How to distinguish between 40GBASE-ER4 and 40GBASE-LR4?
A: Both optical modules use LC duplex connectors for long-distance transmission, but the transmission distance and IEEE standards are different. 40GBASE-ER4 (QSFP-40G-ER4) complies with the IEEE 802.3bm protocol standard, and can transmit 40km with single-mode fiber.
Q: What is the difference between 40GBASE-SR4 and AOC?
A: The 40G AOC active optical cable is the same as the 40GBASE-SR4 optical module for 40G short-distance applications. The difference is that QSFP+ AOC is a pre-terminated optical cable, one end is connected to 40GBASE-QSFP+, and the other end can be connected to SFP+ connectors, LC connectors, etc. in addition to QSFP+ connectors. The transmission distance of 40G AOC is generally not more than 100m.