How to choose optical fiber jumper for optical module

However, with the development of optical modules, the models are becoming more and more complicated, and the wiring requirements are getting higher and higher. How should we choose optical fiber jumpers for optical modules?

The optical module is composed of optoelectronic devices, functional circuits and optical interfaces. The optoelectronic devices include two parts: transmitting and receiving, used for optical signal transmission, and are usually inserted into the optical module slots of switches, routers or network interface cards.

The transmission distance of the optical module is divided into three types: short distance, medium distance and long distance. It is generally considered that 2KM and below are short distances, 10-20KM are medium distances, and 30KM and above are long distances.

There are currently three main central wavelengths for optical module applications: 850nm, 1310nm, and 1550nm. The 850nm band is mostly used for short-distance transmission, and the 1301nm and 1550nm bands are mostly used for long-distance transmission.

There are many types of optical modules, which are divided into 1*9, GBIC, SFF, SFP, XFP, SFP+, X2, XENPARK, QSFP28, QSFP+, etc. according to the package; 10G, 25G, 40G, 100G, etc. according to the rate; For conventional wavelengths, CWDM, DWDM, etc.; divided into single-mode fiber (yellow) and multimode fiber (orange) according to the mode; divided into hot-swappable (GBIC/SFP, XFP) and non-hot-swappable (1 *9, SFF).

Both ends of the fiber optic jumper are equipped with fiber optic connectors, which are mainly used in fiber optic communication equipment rooms, FTTH, LAN, fiber optic data transmission equipment, and test equipment.

According to the transmission mode of light in the optical fiber, the optical fiber can be divided into single-mode optical fiber and multi-mode optical fiber.

Single-mode optical fiber has a thinner core and can only transmit one mode of light. Therefore, its intermodal dispersion is very small and is suitable for long-distance communication. It is generally a G.635 fiber. The inner diameter of the optical fiber is generally 9um, and the outer skin is yellow;

The core of multimode fiber is relatively thick and can transmit light of various modes, but its intermodal dispersion is relatively large, and the intermode dispersion will gradually increase with the increase of transmission distance. It is suitable for short-distance communication. The inner diameter of the fiber is 62.5um and 50um , the skin is orange.

The main types of optical fiber connectors used in optical modules are MPO/MTP, SC, ST, FC, LC, MU, ST, etc.

How to choose optical fiber jumper for optical module?

Transmission distance and data rate

Optical modules have a variety of different transmission rates and transmission distances. When we choose optical fibers for optical modules, we must choose matching optical fiber jumpers. The multi-source agreement (MSA) specifies the working wavelengths of various optical modules in detail. , transmission distance and data rate, etc., and lists the suitable fiber types, which also has a certain reference value for the selection of fiber jumpers.

interface

When choosing a fiber optic jumper, the interface is an essential consideration. Usually, the interface of the optical module usually has 2 ports (one for receiving optical signals and one for transmitting optical signals), that is, duplex SC or duplex LC, therefore, requires the use of duplex SC/LC fiber. However, the newly launched optical modules in recent years have only one port (which can receive optical signals and transmit optical signals), so simplex optical fibers need to be used. Different connectors can be inserted into different devices. If the ports at both ends of the device are the same, we can use MPO-MPO/LC-LC/SC-SC fiber optic patch cords. If you want to connect devices with different port types, you can use LC-SC/LC/ST/LC-FC fiber patch cords.