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Single-mode, multi-mode fiber

2022-09-01
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Fiber to the Home (FTTP), also known as Fiber to the Home (FTTH), refers to a broadband telecommunications system. It is based on fiber optic cables and uses optoelectronics to deliver multiple premium services such as telephone triple play, broadband Internet and television to the home or business.

 

As a common medium, optical fiber has the characteristics of good anti-interference, long transmission distance and high transmission rate.

 

fiber to the home

What is the core raw material of optical fiber?

Optical fiber preform is the core raw material for the manufacture of silica series optical fibers. Simply put, it is a special glass prefabricated rod used for drawing optical fibers (filaments). Optical fiber preform (English name: Optical Fiber Preform or Fiber Preform) is a silica glass rod with a specific refractive index profile and used to manufacture optical fibers (optical fibers for short) [1]. The diameter of the preform is generally several millimeters to several tens of millimeters (commonly known as light rods). The internal structure of the optical fiber is formed in the preform.

ftth cable

Fiber-to-the-home also involves many industries and categories, such as indoor fiber optics, engineering and applications, which are of strategic significance to the entire telecommunications industry and even the information industry.

 

What is Single Mode Fiber?

Single-mode fiber: There is only one transmission mode, and light travels in a straight line in a single-mode fiber without reflection. The core diameter of single-mode fiber is 8um-10um, and the cladding diameter is 125um.

 

What is multimode fiber?

Multimode fiber: It can carry multiple fiber signals and transmit light in multiple modes. The diameter of the multimode fiber is 5um-62.5um, and the diameter of the cladding is 125um.

 

What is the difference between multimode fiber and multimode fiber?

The difference between light sources: single-mode fiber uses laser as light source, which can be precisely controlled; multi-mode fiber uses LED as light source, and the light generated is relatively scattered.

 

Difference in bandwidth: Single-mode fiber uses a laser to generate light of a single wavelength, which has a higher transmission bandwidth than multi-mode fiber using LED light sources.

 

Jacket color: single-mode fiber uses a yellow protective jacket, and multi-mode fibers are mostly orange or aqua green.

 

Application scenarios of single-mode fiber and multi-mode light

Single-mode fiber is usually used for long-distance transmission, the transmission distance is greater than 5 kilometers, and the optical fiber of the 1000BASE-ZX standard can transmit 70 kilometers.

 

Multimode fiber: used for short-distance fiber transmission, such as in the same building or in the park, the transmission distance is less than 2 kilometers.

 

Now insomnia, the Henudu fiber optic transceiver adopts the method of single-mode fiber and the method of wavelength division multiplexing. Usually, two different waves of 1310nm and 1550nm are used in the method of wavelength division on one fiber. Propagation, saving the cost of general fiber optic wiring. Optical transceivers should appear in pairs.

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