With the wide application of FTTH, the requirements for data transmission capability and speed have become more and more important in optical fiber communications, which has also led to high requirements for high-density, low-loss optical fiber connectors.

In the previous article, we introduced what are insertion loss and return loss? These two parameters are the most important indicators of fiber optic connectors. The three factors that affect fiber connection loss are the lateral shift of the fiber core, fiber tilt and gap. Among them, lateral offset is the most important factor.

For MPO connectors, the factors that affect the lateral offset are the eccentricity of the fiber hole, the gap between the fiber hole and the fiber, and the gap between the positioning pin hole and the positioning pin. By determining the dimensional tolerances required for MT sleeves, optical fibers and positioning pins, low losses can be achieved. This requires MPO connectors to have low-loss and high-reliability performance during the grinding process, polishing process, and manufacturing process of experimental testing.

So what is low loss? First, let's take a look at the standard typical insertion loss values of MPO fiber connectors.

Optical performance index of MPO single-mode fiber connector
－The maximum insertion loss of any plug through the standard adapter and standard plug ≤0.75dB (including repeatability); return loss>30dB (MPO/PC),>50dB (MPO/APC)
－The maximum insertion loss of two plugs connected arbitrarily through the adapter ≤1dB; return loss>20dB (MPO/PC),>40dB

Optical performance index of MPO multimode fiber connector plug
－The maximum insertion loss of any plug through the standard adapter and standard plug ≤0.35dB (including repeatability)
－The maximum insertion loss of two plugs connected arbitrarily through the adapter ≤1dB

Although the IEC standard specifies the maximum insertion loss of the connector, the typical insertion loss of most manufacturers' connectors will be below the standard value. At present, the insertion loss index of 8-core or 12-core multimode MPO connectors in the industry is generally standard loss 0.5dB, and low loss is less than 0.35dB.

MPO/MTP fiber optic connectors are an important part of high-density optical interconnect products in data centers. Today, data center cabling also requires higher-performance, higher-density MPO/MTP fiber optic cables. By improving the connector technology and manufacturing technology, HYC Co., Ltd successfully reduced the loss of the MPO connector SM single-mode 12-core to less than 0.25dB, which is 28% lower than the industry low loss value of 0.35dB; The loss of SM single-mode 24 core is reduced to 0.35dB, which is far below the industry standard and the typical loss value of MPO connectors provided by other manufacturers. It provides high-quality MPO fiber optic cables for data center 400G network construction.

About HYC Co., Ltd
HYC can provide customized high-quality MPO/MTP optical fiber cable according to customer needs. Founded in 2000, HYC has more than 20 years of OEM/ODM manufacturing experience in optical communication devices. The main products include high-density optical connectivity, PLC optical splitters, WDM wavelength division multiplexers, MEMS optical switches and other products, which are widely used in FTTx, telecommunications, 5G networks, data centers and other fields.
https://www.hyc-system.com/Product/index_273/3198