http://saclongchamp4.webs.com/ RKEY RKEY Optical fibers are designed for many different application scenarios,converse all star. To understand the different applications, it is important to understand the properties of different fiber types.
Two major types of optical fibers exist for communication system: multimode fiber and single mode fiber. The difference between them is that multimode fiber can carry many modes of light rays while single mode fiber can only carry one mode of light ray,sac longchamp.
This is a big difference. This fact determines that multimode fiber can only be used in short distance link,longchamp pas cher, usually within a few hundred meters,longchamp pas cher, while single mode fiber is used on much longer, usually 40~120km,longchamp pas cher, distance,Understanding Optical Fiber Types – Fiber Optic Tutorial Series Three,converse discount.
Based on this fact,converse all star, it is now easier to understand that multimode fiber is used in LAN network and video surveillance while single mode fiber is used in long distance telephony applications,longchamp pas cher.
Another consequence of this difference is the information carrying capability difference between these two types of fibers,sac longchamp pas cher. Single mode fiber can carry hundreds times of more information than multimode fiber.
Now let’s examine the fiber types in detail,sac longchamp pas cher.
:: Multimode fiber
Light ray travels in the fiber core at discrete angles within its acceptance cone,sac longchamp 90313
http://conversepascher.webs.com/,converse pas cher. Multimode fiber has 50um or 62,longchamp soldes.5um diameter core, which is much larger than a 9um diameter single mode fiber core. Thus a large number of modes (light rays injected into the fiber at different angles) can be coupled into multimode fiber,converse pas cher.
Now let’s look at two light rays that travel along a multimode fiber,sac longchamp solde. One light ray travels straight down the fiber core center which is the shortest path,sac longchamp. A second light ray travels at a steep angle and bounces back and forth by the fiber core side wall (a phenomenon called total internal reflection) while traveling down the fiber length which is a longer path than the first light ray,chaussures converse.
Since the second light ray travels a longer path than the first light ray,Understanding Optical Fiber Types – Fiber Optic Tutorial Series Three,converse all star, they arrive at the fiber end at separate time,converse all star 85653
http://conversepascher.webs.com/,longchamp pas cher. (the second light arrives later than the first)
This disparity between arrival times of the different light rays is called dispersion,sac longchamp pliage pas cher. The consequence of this disparity is a muddied signal at the receiving end,chaussures converse pas cher. In order to properly receive the signal,longchamp, the signal must run at a slower rate and that is why multimode fiber’s bandwidth is limited.
:: Single mode fiber
Single mode fiber,converse pas cher 13846
http://conversepascher.webs.com/,converse solde, on the other hand,converse solde, only accepts one light ray,sac longchamp pas cher, which is the first light ray that travels straight down the fiber core center,boutique longchamp. So there is no arrival time disparity between different fiber modes which makes a cleaner signal at the receiving end,sac longchamp. This is the reason why single mode fiber can run signals at much higher speed resulting in its much higher bandwidth.
Single mode fiber does have some disadvantages though,sac longchamp pas cher. The smaller fiber core diameter makes it much harder to couple light into the fiber,converse pas cher. This increases the manufacturing cost of many single mode fiber optic components such as isolator,converse pas cher, attenuator,converse pas cher, etc,sac longchamp. The tolerances for single mode connectors,converse all star, mechanical splices are also much more demanding,sac longchamp.
One important variety of single mode fiber is polarization maintaining fiber, or also called PM fiber,converse all star. PM fiber carries only one polarization (the light’s electronic field direction) of the light. PM fiber’s major applications include coherent communication system and electro-optic modulators which serves as a light transmitter in high speed fiber optic system,sac longchamp pas cher.