Now if the output source is digital then the signal is not changed further and if the output source needs analog signal then the digital pulses are then converted back to an analog signal using the decoder circuit. The whole process of transmitting an electrical signal from one point to the other by converting it into the light and using Fiber optic cable as transmission source is known as Optical Fiber Communication.
The fiber wires have replaced the copper wire as transmission cable since it has more advantages than the electrical cables. The reasons clearly explain that the fiber optic cables are far better than the coaxial copper cables and this is why Fiber optic cables are preferred over the conventions transmission mediums.
Light or Laser light to be precise is used for the optical fiber communication because of the reason that the laser light is a single wavelength light source. While the other light signals like sunlight or bulb light have many wavelengths of light and as a result, if used for communication they would produce a beam which is very less powerful and on the other hand, the laser having a single beam would result in a more powerful beam as output. In Optical fiber communication, light is used as a signal which transmitted inside the optical fiber cable.
This mode of communication has characteristics which are important to be discussed and makes it a good mode of communication. Satellites are mainly designed for broadcasting. The messages transmitted through a satellite can be obtained by ground stations concurrently.
This kind of communication facilitates mobile communications. Fiber-optic communication is more dependable Satellite communication is low prone to errors.
The price of satellites is independent of distance among the stations, i. The recurring cost of this communication is high as compared to fibers. The fewer delays within communications will make the fiber optic cable use in real-time communications. These are mainly used for permanent, point-to-point positions which need high bandwidth.
Satellite communications are suitable for broadcasting. These communications are also appropriate for communication within terrains wherever it is not possible to lay communication lines.
In a fiber-optic communication system, LED is an essential element. The main function of this component is to change the signal from electrical to an equivalent light signal which is injected into the fiber optic.
The LED characteristics frequently influence the performance. Light-emitting diodes are complex semiconductors used to change the current from electrical to light. So, this conversion procedure is quite efficient to generate less heat as compared to incandescent lights. So, LEDs are used in fiber optic communication due to the following characteristics.
At present, fiber optic communication has to turn into very common in business networks because of the IP-based devices demand like IP cameras, video conferencing units, VoIP phones, which need an increase in BW to carry IP communications. Because of these capabilities, this communication can support BW intensive devices with no problem. This is all about the basic elements of the fiber optic communication system. For additional information, and for any kind of assistance, please write to us as we encourage and appreciate your suggestions, feedback, queries, and comments.
Please share your ideas, suggestions, and comments in the comment section given below. Hello there! This is my first visit to your blog! We are a collection of volunteers and starting a new project in a community in the same niche. This article is very informative.
But instead of photodiode what happens if we use photo voltaic cell as photo detector. Means where PN photo diode required and where avalanche photo diode is used as per their works in OFC.
Great article…….. Generates interest of further reading in the topic. Thank you for posting such an amazing article. Share This Post: Facebook. What is Mutual Inductance and Its Theory. Your blog provided us valuable information to work on. You have done a outstanding job! This is very in understandable language. Thanks a lot.. It is really very easy to understand method. Overall its all-right thanks…………………….
Really a very nice and usefull stuff…thank u soo much. Ur welcome sir…ya ofcourse i will visit to ur website?? However, this has not been the case and costs have fallen to the extent that fibre optics now provides the only viable option for many telecommunications applications. In addition to this it is also used in many local area networks where speed is a major requirement. There are a number of compelling reasons that lead to the widespread adoption of fibre optic cabling for telecommunications applications:.
Any fibre optic data transmission system will comprise a number of different elements. There are three major elements marked in bold , and a further one that is vital for practical systems:.
The different elements of the system will vary according to the application. Systems used for lower capacity links, possibly for local area networks will employ somewhat different techniques and components to those used by network providers that provide extremely high data rates over long distances. Nevertheless the basic principles are the same whatever the system. In the system the transmitter of light source generates a light stream modulated to enable it to carry the data.
Conventionally a pulse of light indicates a "1" and the absence of light indicates "0". This light is transmitted down a very thin fibre of glass or other suitable material to be presented at the receiver or detector. The detector converts the pulses of light into equivalent electrical pulses. In this way the data can be transmitted as light over great distances. Although the original telecommunications fibre optic systems would have used large lasers, today a variety of semiconductor devices can be used.
The most commonly used devices are light emitting diodes, LEDs, and semiconductor laser diodes. The simplest transmitter device is the LED. Its main advantage is that it is cheap, and this makes it ideal for low cost applications where only short runs are needed. However they have a number of drawbacks.
The first is that they offer a very low level of efficiency. The other disadvantage of LEDs is that they produce what is termed incoherent light that covers a relatively wide spectrum. Typically the spectral width is between 30 and 60 nm. This means that any chromatic dispersion in the fibre will limit the bandwidth of the system. Where higher levels of performance are required, i.
Although more costly, they offer some significant advantages. In the first instance they are able to provide a higher output level, and in addition to this the light output is directional and this enables a much higher level of efficiency in the transfer of the light into the fibre optic cable. A further advantage is that lasers have a very narrow spectral bandwidth as a result of the fact that they produce coherent light.
This narrow spectral width enables the lasers to transmit data at much higher rates because modal dispersion is less apparent. Another advantage is that semiconductor lasers can be modulated directly at high frequencies because of short recombination time for the carriers within the semiconductor material. Laser diodes are often directly modulated.
0コメント