Soft fiber optic cable

The definition of soft cable

Cable from the use of the environment can be divided into outdoor and indoor fiber optic cables, indoor cables use of fiber-reinforced materials or very thin reinforcing member, the outer diameter of the smaller, flexible, and easy to bend, suitable for indoor or space smaller occasions wiring. But with the ever-changing cable applications, in the traditional sense of its structure indoor cable or fiber optic cable and similar materials often used for outdoor or other specific circumstances, so in order to more scientific definition of such products, suggested that it be defined as "soft cable ", its application areas include optical connector, FTTH, military field and sensing.

Soft cable Product Categories

Soft cable classification there are many, can be classified in terms of applications, application scenarios, product structure, from the point of view of applications, mainly divided into three categories:

(1) FTTH with a soft optical cable, such as: butterfly cable, drop cable, optical cable and other tree

(2) with a soft optical cable for connecting devices, such as: single cable, dual cable, flat ribbon cable, etc.

(3) Other Special soft cable: Military field cable, fiber optic cable station pull away, blowing micro-optic cable, optical cable and other sensor

Application of fiber optic connectors and terminals

Fiber optic connectors and A/V industry BNC connector commonly used by different, with fiber optic technology continues to mature and get progressive development. Effect of copper connector signal loss of AV systems are generally not large, but the optical connection is different, its transmission system in each interface will play a very big influence. Let's look at the physical fiber optic connection problems arising from optical fiber transmission equipment itself may direct connection, but in some cases, most or almost all connectivity options are all man-made fiber transmission personally. Semaphore fiber optic cable in the signal transmission process of the loss is mainly determined by the quality and type of use of fiber optic cables, each connecting terminal will have some signal loss. Depending on the type of fiber optic connector selected by the user, the connection end signal is lost a combined total may exceed the amount of signal loss of the fiber optic cable itself.

Maintain a normal operation

In the optical fiber system design, system to normal operation, it reached very good results, in the system design, we need to consider the system may occur some unexpected problems, and let the system has reached normal operating results. In the system design, we have to consider the worst system possible situation and plan accordingly, expecting better operating results. Fiber Optic Connector designer must keep in mind to this idea. In system design, security, stability, system connection requires smooth fiber ends, Founder. The connection between the client and the client must be accurate and correct, or even to achieve micron precision, millionths of a meter. Commonly used diameter multimode fiber from 50-62.5 microns and single-mode fiber is only 8-9 microns in diameter. This compared to the diameter of a human hair in diameter (17-180 microns), showing no trace of error can bring in catastrophic losses.

Precision optical fiber connection to the equipment requirements are very strict, so connector must be very clean. Fiber optic connectors and accessories are usually mounted on a set of house, a finger print or external dust might seriously affect connector performance, even lead to transmission failure, therefore, when the connector is not connected, it should be kept in clean protective cover in.

In connection, we should also be fiber optic connector wedge tight, in the present all the fiber optic connector design, through the "collar" to ensure accurate at the time with the connector. Viscose fiber terminals or by crimping the ferrule inside the confining, as a permanent member. After inserting a built-in optical fiber, put the smooth ferrule end mill for fiber optic connectors provide a smooth interface. Rings are usually made of relatively hard material such as ceramics, of course, it may be stainless steel, plastic or tungsten carbide material, SC, ST and FC common ferrule diameter 2.5 mm, LC universal ferrule diameter 1.25 mm. Since the feature rings can be produced in accordance with the requirements of precision, it will become the primary fiber optic connector to determine important characteristics. Among the many connections ferrule, the spring-loaded ferrule ensures the container is connected coaxially aligned between the optical fiber and LED or laser source.

With the expansion of technology development and application of fiber optic connectors are also developing rapidly. Fiber optic connectors used now on the market there are about 12 kinds and even more, each of which is to meet the specific needs and came into being, of course, there are some technical limitations. Now the market trend is mainly towards the moderate price, compact connector model development to support greater transmission density of new transmission distribution system requirements. As user expectations, as the continuous development of the telecommunications industry also contributed to the large-scale application of optical fibers is due to various types of communication and entertainment services on fiber-optic connections due to the rapid growth in demand largely.

Consider terminal

Traditionally, fiber optic terminal is generally slower, the price is higher, the equipment requirements and technical requirements are high. When considering a single-mode fiber optic cable in the terminal, you should take into account several factors in this regard. In some cases, we can choose some already set in accordance with various fiber types good terminal cables.

Tailor-mount applications, we can select a specific terminal, however, adopted after splicing tools, you can reduce on-site terminal extension of the length of the single-mode fiber, reducing the use of the equipment and technology of the quantity demanded. After the multimode fiber optic cable, the new splicing method using a simple optical fiber cutting method, will be assembled into a pre-designed cable connector / cable. This method is very simple, but the fiber-to-fiber connectors butt joints usually uses a special optical gel, so that fiber optic terminal curdle.

How to identify the fiber quality is good or bad

As we all know, in the network cabling, since much lower light transmission loss in optical fibers than the electrical conduction losses in wires, fiber has frequently been used as the information transmission over long distances. But there are a lot of people do not know how to distinguish between good and bad quality of the fiber. Today, 10Gtek transceiver here and from five aspects you elaborate on how to identify the fiber quality is good or bad.

1, loose tube
Loose tube fiber optic cable installed with the general use of PBT polymer materials (polyethylene terephthalate), such as loose tube high strength, deformation and aging. Loose tube cable is of poor quality and sometimes substitute other materials, diameter thin, hand pinch on the flat, and drinking straws same, can not afford the protective effect of fiber.

2. Wire
The cable wire is mainly used to protect the optical fiber from mechanical tension. Good cable typically use high modulus phosphide steel wire, short-term rally is 1500N or 3000N. The poor quality cable will use a small diameter wire or wire instead of the ordinary, so that one easily rust; on the other hand, due to the tensile strength far less than 1500N, when construction could strain the fiber. High modulus phosphide steel wire general was gray, good toughness, easy to bend; and replacement of wire and other general kneading can be bent and a long time in the hands of two hanging cable box will rust break.

3, steel, aluminum
Cable in steel, aluminum is mainly used to protect the fiber from mechanical side pressure, moisture and other effects, better cable will generally use chrome strip. Low-quality fiber optic cable to rust treatment done on only one side of ordinary metal or called black (uncoated steel), replacing chrome strip, over time, will appear in the corroded cable, fiber optic hydrogen loss will increase, and because its easy to constitute a separate integrated sheath bonded sheath, tidal performance is very poor; some places instead of tinned steel chrome strip, tin strip surface of vaginal discharge, bubbles, etc. is inevitable, so the humid atmosphere and surface condensation or flooding conditions, prone to corrosion, especially corrosion faster under acidic conditions. Tin layer poor heat resistance, melting 232 degrees Celsius only, applications when due to high temperature extrusion jacket, making peeling strength uncertainty affecting the cable moisture resistance. The melting point of chromium up to 1900 degrees Celsius, chemically very stable at room temperature in air or immersed in water will not rust, corrosion resistance is very good, because the surface passivation layer is formed so easy oxidation resistance to environmental good performance. Aluminum is generally appear unqualified thermal paste method instead of coating aluminum casting aluminum qualified film, which will also affect cable performance.

4, jacket
Cable sheath is necessary to adapt to many different complex climatic conditions, but also to ensure the long-term (at least 25 years) stability. Cable jacket not only have a certain strength, low thermal deformation, abrasion, water permeability, heat-recoverable and friction coefficient, but also resistance to the environment should be strong, good materials performance and processing characteristics. Less or with poor sheathing material will appear after though through factory acceptance, but the quality defects period of time cracking, water seepage, if the use of recycled plastics to replace quality polyethylene jacket material is more serious. Made of high-quality fiber optic cable sheathing materials, after a cable jacket smooth and bright, uniform thickness, no bubbles, otherwise there will be cable coarse skin phenomenon, and because many impurities in the raw materials, a closer look can be found in the cable jacket has a lot of very small Hang wow, and because thin, the entire outer diameter of the cable is much smaller than the high-quality fiber optic cable. Indoor fiber optic cable, usually made of high quality flame retardant PVC, appearance should be smooth, bright, good flexibility, easy to peel; otherwise there will be poor skin finish, easy and sleeve fiber, aramid adhesion phenomena.

5, ointment
There are cream and ointment fiber cable cream, under normal circumstances, should fill the entire fiber loose tube cream, ointment cable cable should be filled every crevice of the cable core under pressure. Now there is sufficient fiber paste or less half-full approach, then there is only cable cream in the core layer outside wiping, while others are not sufficient charge in the middle of the cable ends. This will make optical fibers are not well protected, affect the transmission performance of optical fiber attenuation, poor water resistance less than the national standard, once the cable accidental seepage will cause the whole link seepage scrapped. And under normal circumstances, even if the accident repair of seepage water seepage also only some can, and you do not need to start over. (National standard water-blocking performance: three meters of fiber optic cable, one meter of water pressure twenty-four hours without water seepage) will also appear if the above problems with poor ointment, and the ointment may be due to poor thixotropic , will cause microbending loss optical fiber, the entire link transmission characteristics of failure; analysis of molecular hydrogen evolution reaction if H ointment and cable acidic will occur in metallic materials, and fiber attenuation increases rapidly in case of H, causing the entire link interrupt transmission.