In recent years, with the rapid development of the Internet, cloud computing and big data, the increasingly high demand for bandwidth has promoted the construction of IT infrastructure data centers. The current speed standard of 10G Ethernet cannot meet the rapid growth of network traffic demands of large and medium-sized enterprises. From the perspective of resource investment and cost, 25G is the choice of server upgrade. Walsun will introduce the 25G SFP28 series optical module to you.
25G SFP28 conventional optical module
The conventional 25G SFP28 optical module consists of SR, LR, and ER. The SR can be transmitted to 100 m with the multi-mode OM4 optical fiber, while the LR and ER optical modules can be transmitted to 10 km and 40 km respectively through the OS2 single-mode optical fiber.
| Abbreviation | PN | Packaging | Wavelength | Distance | Connector |
| 25G SFP28 SR | ES2852X-3LCD01 | SFP28 | 850nm | 100M | LC |
| 25G SFP28 LR | ES2312X-3LCD10 | SFP28 | 1310nm | 10KM | LC |
| 25G SFP28 ER | ES2312X-3LCD40 | SFP28 | 1310nm | 40KM | LC |
25G SFP28 single-fiber bidirectional optical module
The transmitter of Walsun 25G BIDI optical module adopts the uncooled DFB TO form, the central wavelength is 1270nm/1330nm respectively, and the receiver adopts the highly sensitive 25G PIN TO form, the receiving wavelength is 1330nm/1270nm respectively. The product adopts the mature optical device coaxial packaging process platform, realizes the bidirectional single fiber, the optical port rate is 25.78Gbps, can support the transmission distance of 10KM, 40KM.
25G SFP28 CWDM optical module25G CWDM optical module has 25G CWDM optical module and 25G DWDM optical module, of which 25G CWDM SFP28 uses 1270nm-1370nm (interval 20nm) CWDM DML laser and PIN receiver. Or 1470nm-1570nm (20nm apart) CWDM EML laser and APD receiver with built-in CDR circuit for receiving and transmitting channel, maximum rate up to 25.78Gbps, transmission distance 10KM/40KM. The 25G SFP28 CWDM needs to meet both industrial and extended grade temperature ranges due to the variable operating environment of the 5G precursors.
The 25G DWDM SFP28 optical module is mainly used to meet the requirements of 5G pretransmission service. Its components adopt the EML+APD scheme, with the maximum rate up to 25.78125Gbps and the maximum transmission distance of 40km. The 25G DWDM SFP28 series optical modules of Yi Tiangguang Communication support the full wavelength of C-band (interval 0.8nm, i.e. 100GHz) and are widely used in 25G Ethernet and CPRI/eCPRI.
Answers and questions about the 25G SFP28 optical module
Q1: Can the SFP28 port connect to the QSFP28 port?
A1：The 100G SR4 multimode optical module can be used for interconnection. On the premise that the equipment supports, the 100G QSFP28 port can be configured to the 4 * 25G mode, and then the MPO-LC patch cord can be used to connect the 100G SR4 optical module and the 25G SFP28 optical module.
Q2: Can the 25G SFP28 optical module be plugged into the SFP+ port of the switch for use?
A2：Yes, but the speed is 10G
Q3: What is the maximum transmission distance of the 25G SFP28 optical module?
A3：At present, 25G SFP28 optical module can transmit 40 kilometers at most, respectively 25G SFP28 ER, 25G SFP28 bidi, 25G SFP28 CWDM, 25G SFP28 DWDM
The above is the 25G SFP28 series optical module introduced by Walsun. If want to know more, welcome to visit our website.
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