Tag: Fiber Optic

Optical port
The optical port is an abbreviation of the optical fiber interface.
Also known as G port (meaning G fiber port)
Optical port: A fiber-optic bandwidth interface used in large equipment such as equipment rooms and cabinets.

Fibers can be used for audio (sound card with light output), network (fiber as a transmission medium), disk (fiber instead of cable for data transmission), and more.
Optical fibers can be divided into single-mode fibers and multimode fibers. The differences are as follows:
Single mode fiber and multimode fiber can be easily discriminated from the size of the core. The core of a single-mode fiber is small, about 4 to 10 um, and only transmits the main mode. This completely avoids modal dispersion and makes the transmission band wide.

The transmission capacity is large. This fiber is suitable for high-capacity, long-distance fiber-optic communications. It is an inevitable trend in the future development of optical fiber communication and lightwave technology.
Multimode fibers are further classified into multimode abrupt fibers and multimode graded fibers. The former has a larger core diameter and more transmission modes, so the bandwidth is narrower and the transmission capacity is smaller;
In the latter core, the refractive index decreases as the radius increases, and a relatively small modal dispersion can be obtained, so that the frequency band is wider and the transmission capacity is larger. Currently, the latter is generally applied.
Since the transmission speeds of different modes of light in a multimode fiber are different, the transmission distance of the multimode fiber is short. Single-mode fiber can be used in non-relay optical communication.

In the theory of optical fiber communication, the optical fiber has single mode and multimode, and the difference lies in:
1. Single-mode fiber has a small core diameter (about 10m), allowing only one mode of transmission, low dispersion, and working at long wavelengths (1310nm and 1550nm), which is relatively difficult to couple with optical devices.
2. The multimode fiber has a large core diameter (62.5m or 50m), allowing transmission in hundreds of modes, large dispersion, and operating at 850nm or 1310nm. Coupling with optical devices is relatively easy.
For the optical module, strictly speaking, there is no single mode or multiple modes. The so-called single-mode, multi-mode module refers to the optical device used by the optical module to match the fiber to obtain the best transmission characteristics.

Generally, there are the following differences:
1. Single-mode modules generally use LD or narrow-spectrum LEDs as the light source. The size of the coupling components is good with single-mode fiber. When transmitting with single-mode fiber, it can transmit longer distances and the price is higher.
2. Multi-mode modules generally use lower-priced LEDs as the light source. The size of the coupling components is well matched with multimode fibers, and the price is relatively cheap.

The electrical port is relative to the optical port and refers to the physical characteristics of the fire extinguisher. It mainly refers to the copper cable and is the processed electrical signal. Currently, the common network interfaces include 100M electrical ports and Gigabit electrical ports.

Simply put, the electrical port is an ordinary network cable interface, the general speed is 10M or 100M, and some support 1000M. The maximum distance of the electrical port is 100 meters.

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The way of entering home

User room wiring

In the FTTH project, the user’s indoor wiring is the most complicated part, and many factors are considered. It is necessary to ensure the safety of the line, but also to take

into account the indoor beauty, but also to facilitate the construction. The traditional single-core indoor optical cable cannot meet the requirements of the current FTTH

engineering indoor wiring. As a substitute for traditional indoor optical cable, Weipuxin leather cable can adapt to most indoor wiring conditions, such as turning at a

bending radius of 20mm, which can bear the side pressure of people stepping on the cable, and the drag of engineering construction. pull. At the same time, with a variety of

field connectors, real-time end-to-end and docking can be achieved in the shortest time. Therefore, Weipuxin leather cable is the best choice for FTTH indoor wiring.

Vertical horizontal wiring in the building

Like the user’s indoor wiring, the Weipuxin cable is also suitable for vertical horizontal wiring in the building. Horizontal cabling is not very demanding on fiber optic cable,

but vertical cabling must require fiber optic cable to have a certain tensile strength. The lipoxin leather cable can withstand a short-term 200 Newton and long-term 100Newton pulls, so it can guarantee the safety and stability of the vertical wiring of the cable optical cable within a certain height range.

Self-supporting overhead wiring

The self-supporting “8” word wiring cable has a tensile strength and can withstand a span of 50 meters due to its metal suspension unit. The optical cable is laid out in an

overhead manner. The metal suspension unit is cut off before being placed in the house and is fixed on a special fixture. The remaining optical cable is stripped of the metal

suspension wire and then introduced into the room by a leather cable.

Pipeline wiring

Because the pipeline mapping cable is harder than the sheath cable, the tensile strength is higher, and the cable contains water blocking material, which can reduce outdoor rain erosion, so it is suitable for long-distance outdoor pipeline laying. The Vision Information Pipeline Mapping Cable uses an all-metal structure to avoid the introduction of lightning into the room. After the optical cable enters the household, the outer sheath, the water blocking material and the reinforcing member are stripped, and the indoor heating cable is directly used for the indoor wiring, which inherits all the advantages of the indoor wiring of the sheath optical cable, and reduces the connection of the outdoor-indoor optical cable.

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Optical fiber communications have emerged as one of the main pillars of modern communications and have played a pivotal role in modern telecommunications networks. As an emerging technology, optical fiber communication has developed rapidly in recent years and is widely used in the history of communication. It is also an important symbol of the world’s new technological revolution and the main transmission tool for various information in the future information society.

Professional Overview

The fiber optical is the abbreviation of the optical fiber. Optical fiber communication is a communication method in which light waves are used as information carriers and optical fibers are used as transmission media. In principle, the basic material elements that makeup fiber optic communication are fiber optics, light sources, and photodetectors. In addition to classification according to the manufacturing process, material composition, and optical characteristics, optical fibers are often classified according to their applications and can be classified into communication optical fibers and sensing optical fibers. The transmission medium fiber is divided into two types: general purpose and special purpose, and the function device fiber refers to an optical fiber for performing functions of amplification, shaping, frequency division, frequency multiplication, modulation, and optical oscillation of light waves, and is often used for a certain functional device. The form appears.

Optical fiber communication is a communication method in which optical waves are used as carriers and optical fibers are used as transmission media to transmit information from one place to another. This is called “wired” optical communication. Today, the optical fiber has become the main transmission method in the world communication because of its transmission bandwidth, high anti-interference and low signal attenuation, which is far superior to cable and microwave communication.

In 1966, British Chinese sorghum (Charles Kao) published a paper on the use of quartz to make glass filaments (fibers) with a loss of up to 20dB/km, enabling high-capacity fiber-optic communication. At that time, only a few people in the world believed, such as the British Standard Telecommunications Laboratory (STL), the United StatesCorning Glass Company, Bell Labs and other leaders.

In 2009, Gao Song won the Nobel Prize for inventing fiber. In 1970, Corning developed a quartz fiber with a loss of 20dB/km and a length of about 30 m, which was said to cost $30 million. In 1976, Bell Labs established an experimental circuit in Atlanta, Washington, with a transmission rate of only 45 Mb/s, which can only transmit hundreds of telephones, while a medium-coaxial cable can transmit 1800 telephones. Because when it is fashionable to use a laser for communication but to use a light-emitting diode (LED) as a light source for optical fiber communication, the rate is very low.

Around 1984, the semiconductor laser for communication was successfully developed. The speed of optical fiber communication reached 144 Mb/s, and 1920 telephones could be transmitted. In 1992, a fiber-transmission rate reached 2.5Gb/s, which is equivalent to more than 30,000 telephones.

In 1996, lasers of various wavelengths were successfully developed to realize multi-wavelength multi-channel optical fiber communication, so-called “wavelength division multiplexing” (WDM) technology, that is, transmitting optical signals of multiple different wavelengths in one optical fiber… Thus, the transmission capacity of optical fiber communication is doubled.

In 2000, with WDM technology, a fiber-optic fiber-transmission rate reached 640 Gb/s. Some people invented the fiber in 1976, and there was a big doubt about winning the Nobel Prize in 2010. In fact, it can be seen from the history of the above optical fiber that despite the large capacity of the optical fiber, the high-speed laser and microelectronics cannot function as the ultra-large capacity of the optical fiber. The speed of electronic devices has reached the gigabit/second level, and the emergence of high-speed lasers of various wavelengths has enabled the transmission of optical fibers to the order of terabits/second (1Tb/s = 1000 Gb/s). Triggered a revolution in communication technology!”

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