QSFP28 100G LR4 optical module four major

Nowadays, with the increasing demand for network throughput and bandwidth, the demand for 100G high-speed optical modules has also increased. The IEEE organization has developed two optical module standards for 100G networks: 100G SR4 QSFP28 and 100G LR4 QSFP28. However, in practical applications, because the transmission distance of the above-mentioned optical modules cannot fully cover the transmission distance requirements of the data center, these two standards cannot deploy the data center in the most cost-effective way. Therefore, the CWDM4 MSA organization developed the 100G CWDM4 QSFP28 standard with a transmission distance of 2km.

1100G CWDM4 QSFP28 is a standard published by the CWDM4 MSA organization in 2014. It is a 100G transmission mode based on single-mode coarse wavelength division multiplexing (CWDM) technology. The 100G CWDM4 QSFP28 optical module that meets this standard uses a duplex LC interface. The four central wavelengths of 1271nm, 1291nm, 1311nm and 1331nm are used for optical signal transmission.

Let me introduce to you this 100G QSFP28 CWDM4 optical module.

The 100G QSFP+ CWDM4 optical module adopts QSFP28 package, which integrates 4-channel 25Gbps uncooled CWDM DFB laser (1271 nm, 1291 nm, 1311 nm, 1331 nm), 4-channel optical detector, CDRs and miniaturized AWG chip and other micro Chemical components, its typical power consumption is less than 2.6W under commercial-grade temperature (0~70℃) conditions, optical eye diagram Margin is better than 20%, sensitivity (pre-FEC 1E-5BER OMA).

100G QSFP+ CWDM4 uses a duplex LC optical interface to meet the 2KM transmission protocol requirements. The maximum transmission distance can reach 2KM by matching the single-mode jumper OS2.

2. Working principle

100G QSFP28 CWDM4 uses 4-channel 25G NRZ wavelength division multiplexing technology (CWDM4) to multiplex 4 wavelengths of 1271, 1291, 1311, and 1331nm into a single-mode optical fiber for transmission, and then converts the optical signal at the receiving end. It is the electrical signal of 4 output channels. In order to ensure the stability of the optical fiber transmission system, the 100G CWDM4 QSFP28 optical module must be used for optical fiber links with forward error correction (FEC) function.

3. Application scenarios

100G QSFP28 CWDM4 uses 4-channel 25G NRZ wavelength division multiplexing technology (CWDM4) and can be widely used in 100G CWDM4 Ethernet and InfiniBand 4x EDR links.

In data center applications, 100G CWDM4 optical modules have more price advantages than 100G PSM4 optical modules in medium and long-distance transmission; compared with 100G CLR4 optical modules, they have wider application areas, so the demand will be greater; compared with 100G CLR4 optical modules have outstanding price advantages. As data traffic continues to grow, the trend of large-scale and flat data centers has promoted the development of optical modules in two aspects: upgrading transmission rate requirements and increasing quantity requirements. Since data centers use a large amount of optical modules, low cost and transmission distance are undoubtedly the key considerations, so CWDM4 has become the mainstream of 100G overseas cloud computing data centers.