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40G transmission is mainly achieved through the 8 transmission channels of the optical module (with a transmission rate of 10Gbps per channel), which are usually used with MPO fiber jumpers.
8-core MPO jumper connection solution
The 8-core connection can easily achieve 100% utilization of backbone fiber without generating any other losses. In addition, its wiring is simpler and more flexible. However, it is slightly inferior to the 12-core connection in terms of fiber usage density.
12-core MPO jumper connection solution
Although the 40G optical module uses an 8-core fiber cable, we can still use 12-core connection technology to connect to the QSFP port. Many people who use 40G lines in the backbone network now use 12-core connection technology.
However, in solution one, when plugging the 12-core fiber connector into an optical module that only needs 8-core fiber, four fibers are not used. In solutions two and three, although the backbone fiber is 100% utilized by the 12-core cable to 8-core cable conversion module or branch jumper, it will increase additional MPO connectors and insertion loss.
Generally speaking, from the perspective of cost and fiber performance, this is not the best solution, so a more reasonable solution is needed.
The 8-core connection is the best solution for 40G network wiring. However, because the 12-core connection appeared earlier and has a higher advantage in fiber usage density, both 8-core and 12-core connections will have a place in the 40G network of data centers. The specific choice of connection method needs to be determined according to actual application and requirements.
40G and 100G optical modules use MPO interface type fibers, with multiple multimode fiber cores inside, and each multimode fiber core provides one transmission channel for a laser. Some fiber manufacturers in the market fill 8, 12, or 24 fiber cores.
- The 40G optical module uses a 4-transmit, 4-receive transmission method, so it requires 8 channels for docking. The definitions of the two types of fibers in the MPO interface of each channel are completely consistent. Therefore, when using 40G MPO interface optical modules, the two types of fibers are equivalent.
- When using 100G optical modules, different fibers need to be used depending on the type of module packaging:
- CXP, CFP, and CFP2 packaged MPO interface optical modules require 24-core fibers.
- QSFP28 packaged MPO interface optical modules require 8-core or 12-core fibers.
MPO Fiber Patch Cord
With the advent of the 40/100G network era and the widespread deployment of data centers, the demand for information data transmission continues to increase, and the rapid increase in the number of network ports has made traditional fiber optic cabling in data centers difficult to manage due to the limited space. However, MPO fiber patch cords occupy an important position in data center cabling due to their advantages of large core number, small size, and high transmission rate, and can meet the high-density cabling requirements of data centers.
What is an MPO jumper
An MPO (Multi-fiber Push On) fiber jumper is a high-density fiber optic transmission jumper composed of a connector and an optical cable. The MPO connector is one of the MT series connectors and is a plug-in connector with multiple cores and channels. The MT series plug-in pins are connected precisely by two guide holes with a diameter of 0.7mm on the left and right sides of the plug-in end face. The MPO jumper can be designed with 2 to 12 cores, and up to 24 cores can be used. Currently, the most commonly used MPO connector is the 12-core MPO connector. The size of the MPO connector is the same as that of the SC connector, but the density is several times higher, which greatly saves the space occupied by the line ports and cables, and can achieve higher density cabling in a certain space. The great flexibility and scalability also make the deployment of cabling more simple and can better adapt to the needs of future network upgrades, expansions, and changes. It has been widely used in fiber optic communication networks, high-density data centers, transmission systems, and CATV networks, and its applications in active optical cable components such as AOC and QSFP are increasing.
MPO jumper connector
The MPO connector can support 12, 24, 36, and 72 fiber optic connections, and there is a key slot on each MPO connector. When the key slot is on the top of the connector, it is called a key-up MPO connector (KEY UP); when the key slot is on the bottom of the connector, it is called a key-down MPO connector (KEY DOWN). There is a white dot on one side of each connector to mark the position of the first core hole, which means that the first core hole (PIN 1) is on the side where the white dot is located.
MPO jumper polarity issue
Generally, two optical fibers are needed to complete a fiber link, and polarity refers to the interconnection matching between the transmitting end (T) and the receiving end (R) of the fiber link. The MPO adapter is divided into two types: Type A and Type B. Type A: The key slot on one side of the adapter is facing up, and the key slot on the other side is facing down. When connecting two MPO connectors, the key slots of the two connectors are parallel. Type B: The key slots on both sides of the adapter are facing up, so when connecting two MPO connectors, the key slots of the two connectors are on the same line.
Three types of MPO jumper wire sequence (Polarity)
Type A (straight-through type): The fiber cores at both ends of the jumper are arranged in the same position, that is, 1 on one end corresponds to 1 on the other end, and 12 on one end corresponds to 12 on the other end. The key orientations at both ends are opposite, and key-up corresponds to key-down.
Type B (cross type): The fiber cores at both ends of the jumper are arranged in the opposite position, that is, 1 on one end corresponds to 12 on the other end, and 12 on one end corresponds to 1 on the other end. The key orientations at both ends are the same, that is, key-up corresponds to key-up, and key-down corresponds to key-down.
Type C (paired cross type): The C-type MPO jumper has a pair of adjacent fiber cores that cross each other, that is, fiber core 1 at one end corresponds to fiber core 2 at the other end, and fiber core 12 at one end corresponds to fiber core 11 at the other end. The key orientations at both ends are also opposite, and key-up corresponds to key-down.
Advantages of MPO jumpers
- Small size, which enables the aperture of the cabling hole to be increased, greatly improving the cabling density and saving space.
- Modular design, plug and play, saving installation time.
- Corresponding structures can be selected according to different configuration requirements to meet different cabling needs.
- Excellent optical and mechanical performance, low insertion loss in high-speed network environments.
Thank you for your inquiry
Huihongfiber specializes in the research and development and production of MPO fiber patch cords. As a high-tech enterprise and a leading OEM manufacturer and exporter of fiber optic communication devices, its products include fiber jumpers, MPO jumpers, WDM multiplexers, fiber distribution frames, AOC jumpers, etc. Through continuous innovation and development, Huihongfiber has strong technical strength and powerful production capacity, ensuring the reliability and stability of each product and providing customers with excellent products.