Monthly Archives: July 2013

What problems occurs when the transportation and installation of fiber optic cable

Fiber optic cable products is very fragile thing, need to be more specific protection, therefore, fiber optic cable in the transport, laying and installation process should note the following:

  • With the cable tray cable tray should be marked on the side surface direction scroll, scroll, from not too long, usually not more than 20 meters, rolling should be taken to avoid damage to barrier packaging board.
  • Cable should be used forklifts and other handling lifting equipment or special stage, non-optical disc directly from the car rolling or throwing.
  • Prohibited the cable tray with cable or flat stacked, the cable tray in the car need to be fortified wood.
  • Cable should not be set back several times, so the integrity of the internal structure of fiber optic cable, fiber optic cable laying should be carried out before the appearance of inspections and check specifications, quantity, length and attenuation test inspection and acceptance of a single plate, each plate with cable in nursing board with factory test certificate (should be properly kept for future reference), when the demolition of cable shield to guard against damage to the cable.
  • In the construction process should be noted that fiber optic cable bend radius not less than construction requirements, fiber optic cable does not allow excessive bending.
  • Laying overhead cables, through pulley traction, overhead cable to avoid buildings, trees and other facilities friction, avoid sharp mopping the floor or other hard objects with friction and damage to cable sheath, as necessary, installation of protective measures. After the pulley is strictly prohibited forced out of the traction cable, fiber optic cable has been crushed to prevent damage.
  • In the design of optical cable and then the building should be easy to find as much as possible to avoid, such as can not be avoided, cable fire protection measures should be taken.
  • In the relatively long section of cable laying construction, for back plate, cables must comply with Doon “8” dial up. It completely twisted cable status.
  • Fiber Optic Cable box selection must meet the standards of qualified YD/T814-1996 connector box to ensure fiber in the connector box of the radius of curvature of not less than 37.5MM, fiber remaining in the joint box length is not less than 1.6M, cable reinforcements firmly fixed in the connector box, cable and connector box does not occur between the twist, the joint box sealing performance, can prevent moisture from entering.
  • In the splice, the joint bi-directional OTDR attenuation should be based on the average test subject
  • Fiber optic cable laying completed, if not promptly follow treatment, fiber optic cable ends should be sealed to prevent moisture against the fiber.
  • In the splice, if not continue down several times, and then follow a recommended cut off (due to construction of the cable ends may be subject to mechanical damage).
  • Splice completed, should be set aside in the amount of cable connector box at both ends of the cable, and more than a solid plate in the cable rack.
  • Cable network project in one of the important role, not yet come in handy if there are problems before, resulting in economic losses can not be ignored, so the main points of the content of this article we want to focus, to avoid losses and waste.

What will happen if fiber cable is smaller than its minimum bend radius?

Bending a fiber cable over its MBR is one of the biggest factors in fiber damage in projects to install fiber cables. This practice can break the fibers inside or increase fiber attenuation (fiber power loss) than the manufacturer’s specifications. Although the internal fibers are already broken, you can not see any physical damage to the outer skin at all. As a result, you must replace the entire section or even the entire length of the cable. As a good practice, all fibers must be thoroughly tested after cable installation. More info from jiafu fiber optic cable manufacturer

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What is the most important thing to be respected in fiber cable?

During each of the fiber optic cable installation project, we must bear in mind two very important things: First, it is never too bend the fiber cable above the minimum radius of curvature. Second, never pull the cord above the manufacturer-specific cable pulling tension.

Related fiber optic products: fiber optic patch cord, fiber optic pigtail

Related news:

The difference between copper and fiber optics?

Although the fiber optic cables may look like traditional copper cables, we should always bear in mind that inside fiber cables are fragile glass fibers which can be broken easily if not properly treated.

Related news:

Single Fiber Optic Cable Sets New World Record

The National Institute of Information and Communications in Tokyo has achieved a world speed record of sending 109 terabits per second over a single fiber optic cable. The optical fiber cable the team used contained a single fiber with seven “light-guiding cores,” whereas a regular fiber optic cable contains a single core. Each core managed to carry 15.6 terabits per second.

Tim Strong of TeleGeography Research says that the new record speed is far beyond the world’s current capacity, as the total capacity of one of the world’s busiest routes, between New York and Washington D.C., is only a few terabits per second, a speed dwarfed by the 109 terabits per second record. Strong does point out, however, that traffic has been growing 50 percent each year for the past few years.

The runner-up record-setter, Dayou Qian, achieved a speed of 101.7 terabits per second using a method that employed 370 separate lasers, each one carrying a small amount of information, but combining to form a large, single data transfer sent down 165 kilometers of fiber optics.

Though these speeds aren’t practically applied anywhere as of yet, it’s not a stretch to think huge data centers may be using these methods of data transfer soon, as we live in a world dominated by the Internet, and companies like Google and Amazon are gigantic and show no signs of slowing down anytime soon. 7DNG2S92MQHH

Source: fiber optic cable supplier

Disadvantages of Fiber Optics?

The science of fiber optics has its advantages and disadvantages. Though there are more advantages than disadvantages, they still are there. One of the largest disadvantages is the overall price of manufacturing and installation of the fiber optic system. Not only is a large amount of glass wire needed for one of these systems, but expensive transmitters and receivers are needed to move the data it carries. Setting up the wires and splicing them also comes at a large expense and also with a great degree of difficulty.

Related fiber optics products:
Fiber optical cables, fiber optic patch cord, fiber optic pigtail

What are Fiber Optic Attenuators

Fiber optic attenuators are used in applications where the optical signal is too strong and needs to be reduced. For example, in a multi-wavelength fiber optic system, you need to equalize the optical channel strength so that all the channels have similar power levels. This means to reduce stronger channels’ powers to match lower power channels.

The attenuation level is fixed at 5 dB, which means it reduces the optical power by 5dB. This attenuator has a short piece of fiber with metal ion doping that provides the specified attenuation.

There are many different mechanisms to reduce the optical power, this picture shows another mechanism used in one type of variable attenuator. Here variable means the attenuation level can be adjusted, for example, it could be from 1 dB up to 20dB.

Fiber optic attenuators are usually used in two scenarios.

The first case is in fiber optic power level testing. Attenuators are used to temporarily add a calibrated amount of signal loss in order to test the power level margins in a fiber optic communication system.

In the second case, attenuators are permanently installed in a fiber optic communication link to properly match transmitter and receiver optical signal levels.

Optical attenuators are typically classified as fixed or variable attenuators.

Fixed attenuators have a fixed optical power reduction number, such as 1dB, 5dB, 10dB, etc.

Variable attenuators’ attenuation level can be adjusted, such as from 0.5 dB to 20dB, or even 50dB. Some variable attenuators have very fine resolution, such as 0.1dB, or even 0.01dB.

This slide shows many different optical attenuator designs.

The female to female fixed attenuators work like a regular adapter. But instead of minimizing insertion loss, it purposely adds some attenuation.

The female to female variable attenuators are adjustable by turning a nut in the middle. The nut adjusts the air gap in the middle to achieve different attenuation levels.

The male to female fixed attenuators work as fiber connectors, you can just plug in your existing fiber connector to its female side.

The in-line patch cable type variable attenuators work as regular patch cables, but your can adjust its attenuation level by turning the screw.

For precise testing purposes, engineers have also designed instrument type variable attenuators. These instrument type attenuators have high attenuation ranges, such as from 0.5 dB to 70dB. They also have very fine resolution, such as 0.01dB. This is critical for accurate testing.

Source: fiber optic cable manufacturer