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Views: 399 Author: Anna Publish Time: 2025-10-27 Origin: Site
The QSFP-DD technology can double the number of ports used in data transmission while keeping the same size as the previous version, QSFP. It has been developed to provide better use of bandwidth and supports 400G applications. The interface of QSFP-DD carries both optical and electrical signals over eight lanes that transmit at a rate of 50G each, which adds up to an overall throughput speed of 400 G. This design is backward compatible with current QSFP connections, thus enabling easy adoption into existing network systems.
YXFiber's YXF-QDD-400G-ER4 optical module is designed for 40KM long-distance optical communication applications. It adopts QSFP-DD package, Nano-LAN WDM EML laser and SOA+PIN receiver. The module converts 4 channels of 106.25Gb/s (PAM4) electrical input data into 4 channels of parallel optical signals, each channel can run at 106.25Gb/s, with a total data rate of 425Gb/s. At the receiver end, the module converts 4 channels of parallel optical signals at 106.25Gb/s per channel (total data rate of 425Gb/s) into 4 channels of 106.25Gb/s (PAM4) electrical output data. Using duplex LC fiber connectors, it can be connected to any single-mode fiber network. Host FEC is required to support fiber transmission up to 40KM.
Utilizing the QSFP-DD form factor, it achieves a more compact design and smaller footprint, helping to increase data center port density and reduce equipment size and footprint.
To meet green energy requirements, the YXFIber 400G QSFP-DD DR4 optical module features low power consumption, with a maximum power consumption of no more than 12W. This reduces heat generation and helps lower overall data center energy consumption.
Utilizing advanced optical and electronic technologies, this optical module offers high stability and reliability, ensuring stable and secure data transmission.
Q: Can I use an OSFP optical module on one end of a 400G link and a QSFP-DD optical module on the other end?
A: Yes, I can. OSFP and QSFP-DD describe the physical dimensions of the optical module. As long as the Ethernet media type is the same (i.e., both ends of the link are 400G-DR4 or 400G-FR4, etc.), OSFP and QSFP-DD optical modules are compatible with each other.
Q: Can I plug a QSFP-DD optical module into an OSFP port?
A: No. QSFP-DD and OSFP optical modules have different physical dimensions. Only modules of the corresponding size can be used in the corresponding system. If you use the OSFP form factor, you must use the corresponding 400G OSFP optical module. If you use the QSFP-DD form factor, you must use the corresponding 400G QSFP-DD optical module.
Q: What is the difference between 40/100G and 400G optical modules?
A: Compared to 40G/100G optical modules, 400G optical modules are shifting from traditional low-end optical modules based on single-carrier modulation and coherent detection to polarization-multiplexed multi-carrier applications. Furthermore, 400G optical modules offer a wider range of package sizes. Their low power consumption, high bandwidth, and high speed also come with increased network deployment costs.
Q: What are the differences between electrical and optical signal channels using NRZ or PAM-4?
A: NRZ stands for "non-return-to-zero" modulation and describes an electrical or optical signal channel with only two amplitude levels: one representing a digital "1" and the other a digital "0." This is the primary modulation scheme for transmitting data up to 25 Gb/s. PAM-4, on the other hand, stands for four-level pulse amplitude modulation. The "4" indicates that the electrical or optical signal carrying digital data has four different signal levels. In this case, each signal level represents two digital bits. This enables PAM-4 waveforms to transmit twice the bit rate of NRZ waveforms at the same symbol period. This means that PAM4 can achieve a higher bit rate at half the baud rate.
Q: What are the advantages and disadvantages of using OSFP or QSFP-DD optical modules?
A: QSFP-DD is based on the QSFP form factor, but with an additional row of electrical pins. This makes it backwards compatible with 40G and 100G QSFP optical modules, and also compatible with QSFP28 optical modules. However, the OSFP form factor is not compatible with some optical interfaces, requiring the use of adapters for interoperability. To achieve higher transmission power, QSFP-DD optical modules rely on external heat sinks on the switch, while OSFP optical modules have heat sinks integrated into the module housing. This provides a larger heat dissipation surface area than QSFP-DD optical modules, ensuring optimal thermal contact between the heat sink and the components, improving heat dissipation performance.
