Ⅰ.400G Upgrades for Data Centers: Choosing the Right Packaging Is Key

Driven by technologies such as AI, cloud computing, and 5G, the global data volume is growing exponentially. The global market size for 400G optical transceivers reached $1.13 billion in 2025 and is projected to grow to $3.61 billion by 2035. Meanwhile, CignalAI predicts that total shipments of 400G and above high-speed data communication optical modules will reach 42 million units by 2025, indicating a continued surge in market activity.

In selecting 400G optical modules, the package type is one of the most crucial decision-making factors, directly determining the module's compatibility, power consumption, port density, and application scenarios. Currently, QSFP-DD, OSFP, and QSFP112 are the three mainstream package types on the market.

1. QSFP-DD: The Preferred Packaging for Data Centers

QSFP-DD is currently the most widely used package type for 400G modules, employing an 8×50GPAM4 electrical port design and the QSFP-DD MSA standard .

Its most prominent advantage lies in backward compatibility—the same port can accommodate both QSFP-DD and QSFP28 (100G) and QSFP56 (200G) modules, significantly reducing the cost of upgrading data centers from 100G to 400G. QSFP-DD excels in size and power consumption control, with a power limit typically below 12W, and offers high port density, making it suitable for large-scale data center deployments.

2. OSFP: Designed for High-Power Applications

Defined by the OSFPMSA organization, the OSFP employs eight high-speed electrical channels and features an integrated heatsink design that significantly improves thermal management performance. Its maximum power consumption is allowed to reach 15W, 3W higher than the QSFP-DD, meaning that the OSFP can support longer-distance transmission modules and DSP chips with higher power consumption. This gives it a clear advantage in scenarios such as telecommunications networks where heat dissipation and power redundancy requirements are higher.

However, OSFP is incompatible with the QSFP ecosystem and cannot be directly plugged into a QSFP port.

3. QSFP112: The Late Bloomer with High Bandwidth

The QSFP112 is a relatively new package form factor. The "112" in its name represents a transmission rate of 112Gbps per channel, and it uses four channels to achieve 400G transmission. Its power consumption is kept below 10W, demonstrating excellent power efficiency.

Unlike QSFP-DD, QSFP112 uses 4×100GPAM4 modulation on both its electrical and optical ports, which places higher demands on chip and PCB design and results in higher costs. However, it is backward compatible with the QSFP56 and QSFP28 ecosystems, facilitating smooth upgrades to existing networks.

Ⅱ.Package Selection Factors Overview

1) Compatibility: OSFP and QSFP ecosystems are not interoperable; QSFP-DD and QSFP112 both support a certain degree of backward compatibility, facilitating smooth network upgrades.

2) Power consumption: OSFP≤15W, QSFP-DD≤12W, QSFP112≤10W (optimal power consumption).

3) Port density: QSFP-DD and QSFP112 have the highest density, while CFP8 has the lowest.

4) Main application scenarios: QSFP-DD and QSFP112 are both suitable for data centers; OSFP is suitable for telecommunications networks and hyperscale data centers.

Ⅲ.Mainstream Market Share and Future Trends

In terms of market share, QSFP-DD holds a dominant position. Market trends for 2025 show that approximately 70% of 400G deployments will use QSFP-DD packaging, while 44% will involve OSFP solutions (note: multiple packaging types may be used in the same network). OSFP's share in carrier-grade interconnect scenarios for hyperscale data centers is gradually increasing, while QSFP112 is rapidly gaining market attention due to its high energy efficiency. Domestic optical module manufacturers, represented by ETU-Link Technology Co., Ltd., are also actively deploying in various packaging products and continuously expanding their market share.

Looking ahead, module power consumption and thermal management will be key challenges. Currently, 400G modules typically consume between 10W and 14W, and reducing energy consumption will be a core direction for optimizing next-generation products. 800G modules have already entered the commercial stage, and both QSFP-DD and OSFP packages support 800G evolution (such as QSFP-DD800). The compatibility and scalability of package selection will directly affect future upgrade paths.

Technological iteration never stops. Choosing the right approach can make all the difference.

(The data in this article comes from publicly available industry information sources such as QYResearch, LightCounting, TrendForce, and the MSA standards organization.)