Narrow spectral width of the emitted light from laser allows the high bit rate transmission (> 10 Gbps) in long haul direct detection transmission systems as,
fiber dispersion becomes less critical
it is easier to amplify
fiber dispersion becomes more critical
the fiber attenuation becomes less critical
Answers
Answer:
it is easier to amplify
Narrow spectral width of the emitted light from a laser is easier to amplify, which allows the high bit rate transmission (> 10 Gbps) in long-haul direct detection transmission systems.
⦁ A coherent optical source is Lasers.
⦁ Lasers who are of narrower bandwidth produced radiations. Light emitting diode supports multiple modes of propagation of light although they are the incoherent optical source.
⦁ In a light emitting diode, spontaneous emission generated the photons, with a broad spectrum they emit light at a relatively wider angle. On another side, the photons are emitted by stimulated emission in a laser diode.
⦁ The radii Lasers are incompletely monochromatic as a single wavelength of light they are not able to produce and that's why the laser output is generally a range of wavelengths.
⦁ Then a lightbulb laser light has a much narrower spectrum of wavelengths, then also laser light is not purely monochromatic.
⦁ Which waves would have to persist for all time are ideal monochromatic waves, even turning the light beam on and off introduces more frequency components. By laser of narrower bandwidth ns is produced.
⦁ Narrow spectral width (or line width) stability and efficiency driving circuit issues reliability.
Hence, the Narrow spectral width of the emitted light from the laser allows the high bit rate transmission (> 10 Gbps) in long haul direct detection transmission systems as it is easier to amplify.
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