Difference between physical reach and logical reach of fibre optic

He is familiar with the physical reach of fibre optics, which refers to the attenuation of light as it travels through the fibre. However, he is unsure about the concept of "logical reach," which involves the transmission of actual packets of information. Dave has limited knowledge in data transmission and photonics, and is seeking help to understand this concept. By searching "logical reach" of an optical fibre on Google, he has found numerous resources, including a book that may provide answers to his questions.
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Difference between "physical reach" and "logical reach" of fibre optic

Undergrad physics student here, working with fibre optic cables for my final year project, specifically to do with amplifying signals for fibre-to-the-home internet service.

I understand the physical reach of fibre optics - the light attenuates as it passes along the fibre.

But what is the "logical reach" of the fibre? I understand it is something to do with sending actual packets of information, but not much else.

I have a practically no knowledge of data transmission, and a basic knowledge of photonics. Any help is appreciated.
 
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FAQ: Difference between physical reach and logical reach of fibre optic

1. What is the difference between physical reach and logical reach of fibre optic?

Physical reach refers to the maximum distance that a fibre optic cable can physically transmit data without the need for signal amplification. Logical reach, on the other hand, refers to the maximum distance that data can be transmitted reliably using error correction techniques. In simple terms, physical reach is the distance a signal can travel without any intervention, while logical reach takes into account the use of technology to extend the reach of the signal.

2. Why is the physical reach of fibre optic important?

The physical reach of fibre optic is important because it determines the maximum distance that data can be transmitted without the need for additional equipment or signal boosters. This impacts the overall cost and efficiency of the network, as longer physical reach can result in fewer signal repeaters and lower maintenance costs.

3. How is the physical reach of fibre optic determined?

The physical reach of fibre optic is determined by various factors such as the type of fibre used, the quality of the cable, the operating wavelength, and the transmitter power. Other factors that can affect physical reach include the presence of bends, splices, and connectors in the cable.

4. What factors can affect the logical reach of fibre optic?

The logical reach of fibre optic can be affected by factors such as the quality of the cable, the type of error correction techniques used, and the level of noise in the transmission. The use of higher quality cables and advanced error correction techniques can help extend the logical reach of fibre optic.

5. Can the physical reach of fibre optic be extended?

Yes, the physical reach of fibre optic can be extended through the use of signal repeaters, amplifiers, and regenerators. These devices help boost the signal and maintain its integrity, allowing it to travel longer distances without any loss of data. However, extending the physical reach also increases the cost and complexity of the network, so it is important to find a balance between physical reach and cost efficiency.

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