Question

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,

Answer 1

Answer:

Their correct answer would be "the fiber dispersion becomes less critical".

Explanation:

For such implementations including solid-state laser pumping, fibre laser pumping, as well as material processing, powerful laser diodes have already been developed. This same spectroscopic bandwidth of greater power diodes would be generally around 3-5 nm. A limited emission spectrum with in scope of 0.1-0.5 nm as well as a relatively small wavelength threshold can indeed be hugely helpful for special applications like spin-exchange optoelectronic pumping (SEOP), which would be absolutely essential throughout nuclear physics, particle physics, beam cooling, & neutron diffraction. To pinpoint this same spectroscopic spacing of increased power laser diodes, a wide range of outer cavity techniques have been devised.

For more information - https://lasers4lab.com/narrow-spectral-line-width-of-high-power-lasers