How to differentiate between single-mode and Multi-Mode Optical Fibers

How to differentiate between single-mode and Multi-Mode Optical Fibers

Single-Mode Optical Fiber

The core of a single-mode optical fiber is fine, so that the light can be directly transmitted to the center. We recommend that you use this function when the distance is long.

In addition, the distance loss of a single-mode signal is smaller than that of a multi-mode signal. At a distance of 3000 feet from the head, multimode optical fiber may lose 50% of its LED optical signal strength, while a single-mode optical fiber only loses 6.25% of Its laser signal at the same distance.

In applications, the most common deciding factor for multi-mode or single-mode is distance. Multimode is preferred if only a few miles, because the LED transmitter/receiver is much cheaper than a single-mode laser. If the distance is greater than 5 miles, the single-mode optical fiber is the best. Another consideration is bandwidth. If future applications may include transmission of big bandwidth data signals, single mode will be the best choice.

Multimode Optical Fiber

Optical Signals in multi-mode optical fiber are transmitted through multiple channels. It is generally recommended to be used when the distance is less than a mile.

The valid distance from the Multimode Optical Fiber transmitter to the receiver is about 5 miles. The available heel is also affected by the type and quality of the transmitting/receiving device. The stronger the light source, the more sensitive the receiver, and the farther the distance. Research shows that the bandwidth of multimode optical fiber is about 4000 Mb/s.

The single-mode optical fiber is manufactured to eliminate pulse widening. Because the core size is small (7-9 microns), light Skip is eliminated. Focus laser sources are used at 1310 and 1550nm wavelengths. These lasers direct radiation into tiny fiber cores and spread to the receiver without significant jumps. If you can compare multimode to a hunting hacker, and can hold many bullets at the same time, a single mode is a rifle, and a single light is like a bullet.

Depending on the modulus of the transmission point, the optical fiber can be divided into single-mode optical fiber and multi-mode optical fiber.

The so-called "Mode" refers to a beam of light that enters the optical fiber at a certain rate.

• Single-Mode Optical Fiber uses solid-state lasers as the light source
• Multi-Mode Optical Fiber uses light emitting diode as the light source.

Multi-Mode Optical Fiber allows multiple bundles of light to be transmitted at the same time in the optical fiber to form a mode dispersion (because each "Mode" light enters the optical fiber from different angles and the time they reach the other end point is also different, this feature is called mode dispersion. The Mode Dispersion Technology limits the bandwidth and distance of Multimode Optical Fiber. Therefore, the core line of multimode optical fiber is coarse, the transmission speed is low, the distance is short, and the overall transmission performance is poor, but its cost is relatively low, it is generally used within a building or in an environment adjacent to a geographical location. A single-mode optical fiber can only transmit one bundle of light. Therefore, a single-mode optical fiber has no mode dispersion. Therefore, the core of a single-mode optical fiber is smaller, and the transmission frequency, bandwidth, capacity, and distance are long, however, the cost is high because it requires a laser source.

Optical cable jacket identification, 50/125, 62.5/125 for Multimode, 9/125 (g652) for single mode.

After the optical fiber can be ground up, use a 100/200-fold magnifier to check that a small black spot is a single-mode, and a larger double-ring is a multimode. The core can also be distinguished in the melting machine. In the display of the melting machine, the core is empty in a single mode, and it looks like a multi mode.

Differences in simple usage:

Generally, multimode is used in areas close to the park, and the distance between single-mode transmission is far away. Generally, multimode is used in the telecom field.

• Multi-mode optical fiber is the most primitive technology for optical fiber communication. This technology is a revolutionary breakthrough for us to achieve communication through optical fiber for the first time.
• With the development of optical fiber communication technology, especially the development of laser technology and people's urgent demand for long-distance and large-information communication, people have found a better optical fiber communication technology-single-mode optical fiber communication.
• The digital optical transceiver uses video-less compression transmission technology to ensure real-time and non-delayed transmission of high-quality video signals and ensure the high definition and pure color of the images. This transmission mode has a large amount of information data, and optical terminals of more than 4 videos use data streams of more than 1.25 Gbit/s. The data stream of 8 videos is as high as 1.5 Gbit/s.