There are various types of 800G optical modules, and based on single channel speed, 800G optical modules can be roughly divided into two categories: single channel 100G and 200G. Among them, a single channel 100G optical module is relatively easier to implement, while a 200G optical module has higher requirements for optical components and requires a gearbox for conversion.
Single mode 800G optical module
The single-mode 800G module is suitable for long-distance fiber optic transmission and can cover a wider network range.
·800G DR8: It adopts 100G PAM4 and 8-channel single-mode parallel technology, uses single-mode fiber, and has a transmission distance of up to 500m. It is usually used in data centers, 800G-800G, 800G-400G, and 800G-100G interconnects.
·800G PSM8: using CWDM technology, 8 optical channels, transmission rate of 100Gbps, supporting a transmission distance of 100m, very suitable for long-distance transmission and fiber resource sharing.

·800G 2DR4: 2 "400G-DR4" interfaces. Equipped with 2 MPO-12 connectors, no fiber optic branching cables are required, and each 800G optical module can achieve 2 physically different 400G-DR4 links.
·The 800G FR and LR in the names of 800G 2FR4/2LR4/FR4/FR8 represent fixed distance and long distance, respectively, indicating fixed and longer transmission distances.
·800G 2xFR4 and 800G 2xLR4 are composed of 4 wavelengths and operate at a single channel rate of 100 Gbps. The optical module reduces the required number of optical fibers to 4 by using Mux. 800G 2xFR4 supports a transmission distance of 2km, while 800G 2xLR4 supports a transmission distance of 10km. These standard optical interfaces use dual CS or duplex LC interfaces. They are all suitable for 800G Ethernet, distribution 2x400G FR4/LR4, data centers, and cloud networks.
·800G FR4: using 4 wavelengths and PAM4 technology, with a single channel rate of 200Gbps, requiring 2 optical fibers. This module supports a transmission distance of 2km and is generally used for data center interconnection, high-performance computing, storage networks, etc.
·800G FR8: Using 8 wavelengths, each wavelength operates at a speed of 100Gbps. This module requires two optical fibers and supports a transmission distance of 2km. Common applications include wide area networks, data center interconnection, etc.
Multi mode 800G optical module
When the transmission distance is less than 100m, there are two main standards for 800G optical modules used in multimode applications.
·800G SR8: Using VCSEL technology, with a wavelength of 850nm and a single channel rate of 100Gbps PAM4. It requires the use of 16 optical fibers. This can be seen as an enhanced version of 400G SR4, with twice the number of channels as 400G SR4. This optical module adopts MPO16 or dual MPO-12 optical interfaces.

·800G SR4.2: Using two wavelengths of 850nm and 910nm, it achieves bidirectional transmission through a single fiber, commonly known as bidirectional transmission. This module contains a DeMux component to separate two wavelengths. A single channel speed of 100Gbps PAM4 requires a total of 8 fibers, which is half of the number of fibers required for SR8.
Frequently Asked Questions for 800G Optical Modules
Q1: What is the difference between 800G QSFP-DD and 800G OSFP in 800G optical modules?
A1: QSFP-DD (four channel small pluggable dual density) and OSFP (eight channel small pluggable) are two different types of optical module packaging used to support high-speed optical communication. The power consumption of OSFP is slightly higher than that of QSFP-DD, which is smaller in size and suitable for high-density port layout. QSFP-DD is fully compatible with QSFP56, QSFP28, and QSFP+, while OSFP is not compatible.
Q2: Can the OSFP interface module be plugged into the QSFP-DD interface?
A2: Cannot. Due to the different interface types of QSFP-DD and OSFP, their physical dimensions and connection methods are also different, so they cannot be plugged and unplugged from each other.
Can the OSFP on one end of the 800G link be interoperable with the QSFP-DD on the other end?
A3: Sure. OSFP and QSFP-DD represent the physical dimensions of the module. If the Ethernet media type is the same, OSFP and QSFP-DD modules can operate with each other.
Q4: What are the advantages of upgrading to 800G technology?
A4: Switching to 800G technology can bring multiple advantages to network infrastructure and data intensive applications:
Bandwidth increase: 800G technology significantly increases bandwidth, achieving faster and more efficient data transmission, meeting the growing demand for high-speed data transmission in various industries.
Higher data rates: With 800G technology, data rates of up to 800Gbps can be achieved, enabling faster data processing, reduced latency, and improved overall network performance.
Q5: What is the rate and modulation format used by the 800G OSFP/QSFP-DD module?
A5: All 800G optical modules use 8 electrical channels (8 transmit channels and 8 receive channels) in each direction, with each channel using a 100G PAM4 data rate, resulting in a total bandwidth of 800Gbps for each module. Each channel modulates 8 light waves.

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