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800G optical modules come in various types. Based on the single-channel rate, 800G optical modules can be broadly categorized into two classes: single-channel 100G and 200G. Among these, single-channel 100G optical modules are relatively easier to implement, while 200G modules place higher demands on optical components and require gearboxes for conversion.
Single-mode 800G modules are suitable for long-distance fiber transmission, covering a wider network range.
· 800G DR8: Utilizes 100G PAM4 and 8-channel single-mode parallel technology, uses single-mode fiber, supports transmission distances up to 500m. Commonly used in data centers.
· 800G PSM8: Uses CWDM technology with 8 optical channels, a transmission rate of 100Gbps per channel, and supports a transmission distance of 100m. Very suitable for long-distance transmission and fiber resource sharing.
· 800G 2DR4: Features 2 "400G-DR4" interfaces. Equipped with 2 MPO-12 connectors, eliminating the need for fiber breakout cables. Each 800G module enables 2 physically separate 400G-DR4 links.
· 800G 2FR4/2LR4/FR4/FR8: In these names, FR and LR stand for Fixed Reach and Long Reach, respectively, indicating fixed and longer transmission distances.
· 800G 2xFR4 and 800G 2xLR4: Consist of 4 wavelengths, each operating at a single-channel rate of 100 Gbps. 800G 2xFR4 supports a 2km transmission distance, while 800G 2xLR4 supports 10km. Both are suitable for 800G Ethernet, breakout to 2x400G FR4/LR4, data centers, and cloud networks.
· 800G FR4: Employs 4 wavelengths with PAM4 technology, a single-channel rate of 200Gbps, and requires 2 fibers. This module supports a 2km transmission distance and is typically used in data center interconnects, high-performance computing, and storage networks.
· 800G FR8: Uses 8 wavelengths, each operating at 100Gbps. This module requires two fibers and supports a 2km transmission distance. Common applications include wide area networks and data center interconnects.
When the transmission distance is below 100m, there are primarily two standards for 800G modules used in multimode applications.
· 800G SR8: Uses VCSEL technology with an 850nm wavelength and a single-channel rate of 100Gbps PAM4. It requires 16 fibers. This module uses an MPO16 or dual MPO-12 optical interface.
· 800G SR4.2: Utilizes two wavelengths, 850nm and 910nm, to achieve bidirectional transmission on a single fiber. The module includes a DeMux component to separate the two wavelengths. The single-channel rate is 100Gbps PAM4, requiring a total of 8 fibers, which is half the number required by SR8.
