Fiber Optic Access Network Will Be The Main Force Of The Internet Information Highway In The Future

As with the rapid development of social information, fiber optic technology and devices that are dedicated to providing the transfer of a new business for WAN and fiber optic access network. The MSTP and PON developments are the most representative. They are also the best solution to provide various new businesses in MAN and fiber optic access network that are based on fiber optic transmission technology. As water for fish, developments in fiber optic access technology cannot do without the support and development of fiber optic access devices.

Due to the constant updating of fiber optic access technology and the increase in the adherence of manufacturers, today the categories of fiber optic access devices are increasingly evident, mainly divided into three categories:

Fiber optic connection elements, it is applied in telecommunication and computer network terminal connections, related product: fiber optic connection cable, fiber optic connector, etc.
Fiber optic transceiver, used for data transmission of computer network, related products: fiber optic splitter, fiber patch panels, etc.
Fiber optic engineering devices and fiber optic testers, it is especially for large-scale projects, related products: fiber optic fusion splicer, fiber optic testers.
Next we will present these three fiber optic access devices with representative products respectively, they are fiber connection cables, fiber optic splitter, fiber optic fusion splicer.

The fiber optic patch cord (shown in figure) is a fiber optic cable or a fiber optic unit that, without a fiber optic connector, is used in fiber distribution boards on various link roads. Fiber patch cords are also used in local long distance optical networks, data transmission and private network, various test and control systems.

Fiber optic splitter (as shown in the figure), someone calls it as fiber coupler, it belongs to passive optical components, it is used in telecommunication networks, fiber cable TV networks, subscriber loop system. Fiber optic splitters can be divided into a standard coupler (double branch, 1 x 2 unit, that is, the light signal into two powers, for example, 1 × 2 fiber optic splitter, 1 x4 fiber optic splitter, splitter Fiber Optic 1 x 8 and so on), Star / Tree Fiber Dividers and Wavelength Division Multiplexer (WDM, if the wavelength is high density separation and the wavelength spacing is narrow, belongs to DWDM).

The fiber optic fusion splicer (shown in the figure) is mainly used in telecommunications for the construction and maintenance of fiber optic cables, it is applied to telecommunication operators, engineering companies, private networks, it is also used in the production of passive and active optical devices and fiber optics. fiber splice modules.

Fiber Optic Fusion Splicer
Above all, fiber optic access devices greatly improve the data transmission and processing capabilities of the fiber optic access network, while providing two benefits:

First, it solved the long-distance transmission problems of the fiber line connection and made its coverage range wider. In this way, you can reduce the number of transit nodes through the entire coverage network and facilitate the network structure.

Second, it met people’s needs for various broadband businesses and improved the quality of new business data. It solved the problem of traditional copper cable access network fundamentally and laid a good foundation for achieving the FTTH dream. I believe that in the future, the fiber optic access network will be the main force of the Internet information highway.

Fiber Optics Based on Multi Point Fiber Distribution Systems

The multipoint distribution system is the extensive wireless technology used to provide voice, data, Internet and video services. Residential and commercial customers have been assigned for that delivery of broadband services in a point-to-point or point-to-multipoint configuration. As a result of the propagation characteristics of the signals, the systems use a network architecture similar to the cellular one, although the services provided are fixed, not mobile.

In some cases, fiber distribution systems have the ability to connect multiple remote sites to a base station. A common application is that repeaters are based in a main building and other buildings, such as RF shielding areas and basements, all located in a few-mile repeater building. A and the repeater use the end of the head. A multiple fiber optic transceiver assembly in the base station is commonly called a “front end”. The far end of the fiber is called the “remote hub” computer.

We must pay attention that each fiber optic receiver output at the repeater site has individual pads to reduce the compound background noise. For example, if the 40 dB is used, an additional 80 dB of combiner port-to-port isolation occurs. In a real application it is a good idea to even consider the taps at the test point to read the RF levels. It is only used for testing and protection. A system similar to the one we use the WDM, if the number of fibers is reduced by 50%, but you must add a WDM at each remote site and another WDM for each fiber added at the repeater site. In the example of 4 remote sites, 8 WDM would be needed to operate all full duplex fibers and 4 fiber optic transmitters would have to be 1550nm models. So there is also a point that we must be careful. The fiber optic transceiver is not frequency selective and the same unit can receive 1330 or 1550 nm optical signals equally well. We also measure noise performance and are pleased to inform you that according to theory, optical splitters add virtually no noise. No matter which output we test, this means that your receiver connected to that network will also display very high quality readings.

When we use fiber optic links in the fiber distribution system, sometimes we need a fiber optic splitter to divide the signal it was carrying. The system designer has the option of dividing the RF or optical domain. The function of the optical splitter is familiar to the RF splitter. Other parts of the incoming fiber optic network are connected to the outgoing transmission, and the terminal device is connected and the other main part is its direct part. There are also dividers that divide the input into 2, 4, or more outputs. According to the structure and locations of fiber optic splitter, in fiber optic network, we need different splitter splitting ratios, such as 1 × 2, 1 × 4 and 1 × 8 splitter etc. In addition, unused single-mode fiber cable, specific products can see in 50m single-mode mode, can also strengthen the signal used for RF over fiber systems between connected buildings for data communication and spare fibers.

Fiber Optics is the Ideal Way in Today’s and Future’s Application

As we see, fiber optic transmission has already been the efficient way of transmitting a wireless signal and an RF signal. Compared to coaxial cable, fiber optic cables have advantages such as less signal loss and less weight, except that it is also cheaper than coaxial cable. For these reasons alone, fiber optics plays an important role in wireless networks. Below, we will introduce various fiber optic products in different applications for you.

Fiber optic transmitter and receiver

The function of the fiber optic transmitter, optical transmitter with AWG, see in the figure, is to transmit the RF signal to an optical signal at 1.3 μm, the input impedance of the fiber optic transmitter is 50Ω and the output is a signal Optic whose brightness is synchronized with the RF voltage. An optical detector internal to the laser transmitter is used to monitor the output power and adjust the laser bias current to maintain a constant average optical output. Maintains consistency in performance, best linearity, and longest system life.

The fiber optic receiver uses a high speed detector and to transmit the optical signal to the RF signal. Generally used with fiber optic transmitter. Low noise linear gain stages boost the signal back to the desired RF level. All of our Welink fiber optic receivers pass consistent tests and maintain stable, long-term performance.

Fiber optic cables and fiber optic connectors

Well, based on the special feature of RF in fiber optic applications, singlemode fiber cable is the ideal choice. The fiber has a core and cladding size of 9 / 125μm, and the fiber optic connector mainly for stability and light coupling. But in RF / fiber optic system, angle polished connectors are used more often, such as APC, UPC. Because of them, they can reduce optical reflections on the connector. At the same time, we need to know that the reflection in the system can cause more noise, dirt, etc., then the connector will cause more loss of the connector, but also reflections. Therefore, the connector should be kept clean, the correct way to stay clean is that with 99% alcohol and lint-free wipes, always replace the ferrule cap when the connector is not in use.


In the public safety of the building, the Welink technology and the Bidi fiber optic transceiver deliver the signal through the fiber optic network for the distribution of the signal in the building. The benefits of fiber optics are endless. Welink’s modular devices transmit the fiber RF signal easily and maintain undistorted communications in the construction of emergency, fire and police RF radio systems. Facing system capacity and improving network reliability. Welink is aiming for a lower, safer and more reliable telecommunications cost for users.

On the military side, today’s global battlefields are sophisticated networks of Army, Navy, Coast Guard, and Air Force defense organizations that require robustness, need monitoring and tracking, as well as voice, video, and data communications High quality in meeting these requirements, Welink RF Unmatched performance solution for radio frequency transport applications ranging from low frequency through VHF, UHF to satellite band transmissions. Fiber optic cables provide the best performance for the safety of soldiers in military applications. The figure shows the special connector that can be used in the military application. We are very strict with the design and quality of the fiber optic connector.

With developments in the Internet, wireless LAN technology, and protocols such as IEEE 802.11, Welink fiber optic transceiver technology provides architecture design flexibility, extended radio frequency coverage, and improved performance in the wireless spectrum, and provides greater capacity for wireless users. Welink is doing everything possible to obtain faster and more reliable communication solutions.