FDM, TDM & Fiber-optics: Multiplexing Explained

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In summary, FDM, TDM, and fiber-optic communication are different methods of multiplexing to allow multiple users to transmit data simultaneously. FDM splits the total frequency bandwidth into smaller ranges for each user, while TDM allocates the entire bandwidth for a short period of time to each user. Fiber-optic communication uses a different form of multiplexing called wavelength division multiplexing, as the high frequencies of light make FDM difficult. TDM is more efficient for fiber-optic communication due to the higher frequency capabilities.
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daredevil
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Hi,

In FDM, the total frequency bandwidth is split into small frequencies ranges for each user and send simultaneously after multiplexing.

In TDM, I was wondering is the whole bandwidth given for a small time for each user while multiplexing

And in fiber-optics, why is FDM not used?

Thanks...
 
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  • #2
The range of available frequencies in a copper wire (or radio signal) can be many magnitudes of 10, lending itself to frequency division multiplexing.

Carrying a range of frequencies in a fibre optic cable is not simple and relatively new. It is commonly called wavelength division multiplexing for an optical carrier.

Since the frequencies of light are so much higher, time division multiplexing allows many more channels to be carried than radio frequencies.

Wikipedia - Fiber-optic communication
Wikipedia - Time-division multiplexing
 

Related to FDM, TDM & Fiber-optics: Multiplexing Explained

1. What is FDM?

FDM, or Frequency Division Multiplexing, is a technique used to combine multiple analog signals into a single transmission channel. It works by dividing the available bandwidth into smaller frequency bands and assigning each signal to its own band. This allows multiple signals to be transmitted simultaneously without interfering with each other.

2. What is TDM?

TDM, or Time Division Multiplexing, is a method of combining multiple digital signals into a single transmission channel. It works by dividing the available time slots in the channel and assigning each signal to its own time slot. This allows multiple signals to be transmitted one after another, effectively sharing the same physical channel.

3. How does FDM differ from TDM?

The main difference between FDM and TDM is the type of signals they multiplex. FDM is used for analog signals, while TDM is used for digital signals. FDM divides the available bandwidth into frequency bands, while TDM divides the available time slots. Additionally, FDM allows multiple signals to be transmitted simultaneously, while TDM transmits signals sequentially.

4. What is fiber-optic multiplexing?

Fiber-optic multiplexing is a method of combining multiple signals onto a single optical fiber for transmission. This can be achieved through various techniques such as FDM or TDM. Fiber-optic multiplexing is often used to increase the bandwidth and efficiency of communication networks.

5. What are the advantages of multiplexing?

The main advantage of multiplexing is the efficient use of a single transmission channel for multiple signals. This allows for increased bandwidth and cost savings, as multiple signals can be transmitted without the need for additional physical channels. Multiplexing also reduces signal interference and improves overall network performance.

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