Skip to content The 400G optical module is currently the core connecting component for AI computing power clusters (such as H100/H200 clusters) and large data centers. It achieves a transmission rate of 400Gbps on a single port through parallel optical paths (such as 8x50G or 4x100G) and PAM4 modulation technology. Compared to the 100G/200G, it not only doubles the bandwidth, but also significantly increases the requirements for heat dissipation and signal processing.
Yingda is a Chinese optical module cable manufacturer and wholesaler, we committed to providing customers with optical modules with stable quality. No matter how the market changes, quality is always the first priority. With long-term stable supply chain support and mature cost control, Yingda share the extra benefits with customers and promise to provide customers with the best quality and most competitive price and services, so that customers can stand out from many competitors.
At present, there are two main packaging forms for 400G modules: QSFP-DD and OSFP, and the specific model chosen (SR8, DR4, FR4, etc.) depends entirely on how far you need to transmit. The general recommendation is to upgrade most existing data centers to 400GB, and QSFP-DD is a more cost-effective and compatible option. If it is a newly built large-scale AI cluster and plans to evolve towards 800G in the future, OSFP will be a longer-term choice. Below is the comparison of 400G QSFP vs OSFP.
400G optical modules are mainly divided into the following categories, according to their transmission distance, fiber type, interfaces and application scenarios:
Part no | Interface | Fiber type | Transmission distance | Features |
SR8 / SR4 | MPO-16 APC / MPO-12 APC | MMF OM3/OM4 | 100m | 8 transmits and 8 receives in parallel, 8X50G PAM4, with the lowest power consumption (6-8W) |
VR4 | MPO-12 APC | MMF OM3/OM4/OM5 | 50m | 4x100G architecture, solutions launched by Huawei and other manufacturers |
DR4 | MPO-12 APC | OS2 | 500m | 4 parallel channels, single wavelength 100G, can branch 4x100G |
FR4 | Duplex LC/UPC | OS2 | 2km | 4 wavelength CWDM multiplexing, preferred for AI clusters |
LR4 | Duplex LC/UPC | OS2 | 10km | 4 wavelength CWDM, higher power EML laser |
ER4 | Duplex LC/UPC | OS2 | 30-40km | 4-wavelength LAN-WDM, APD receiver, power consumption<13W |
ZR / 400ZR | Duplex LC/UPC | OS2 | 80-120km+ | Coherent optical technology, C-band tunable |
400G no longer uses the traditional "0/1" switch signal (NRZ), but instead adopts PAM4 (four level pulse amplitude modulation). It transmits 2 bits of information within one pulse cycle, doubling the bandwidth efficiency.
Due to the vulnerability of the 400G signal, a powerful DSP chip is integrated inside the module to repair distortion.
This is currently the latest trend. In order to reduce power consumption and latency (AI is extremely sensitive), the LPO scheme removes the DSP inside the module and hands over the compensation function to the switch chip, reducing power consumption by about 50%.
If you are worried about what kind of 400G optical module to choose, based on comprehensive considerations of transmission distance, fiber type used, or switch brand, Yingda recommended to follow the following selection ideas:
In AI training, thousands of GPUs need to frequently exchange gradient data. The 400G module combined with RDMA (Remote Direct Memory Access) technology can achieve extremely low latency large-scale parallel computing.
Mass production of products with short lead times.
Yingda optical module are the most competitive price based on the best quality. We keep long term reliable in-between-after sales service.
Yingda can provide 400G SFP modules in bulk, the most popular types are SR8, DR4, FR4, LR4/LR8, and ZR/ZR+ optics.
Not all 400G optical modules support breakout, usually only DR4/SR8 supports it, FR4 does not. The switch side needs to manually configure the “channel group” or “split” command and restart the ports.
Please pay attention to DOM (Digital Diagnostic Monitoring) data. An abnormal increase in bias current usually indicates laser aging. Low RX Power is usually caused by fiber contamination or excessive link loss.
Yes, Yingda can provide one click LC fiber cleaner pen,MPO cleaner pen, which are suitable for 400G optical modules. Please contact the sales team.
High productivity efficiency, skilled front-line operators and strict production control ensure timely delivery.
High-precision testing equipment and top industry quality control system ensure high quality standards.
Long-term stable supply chain and cost control that changes in line with market trends ensure the best price
Sorry that there’s no information that interests you. Please fill in the feedback form so that we can improve.
