The Rare-Earth-Doped Fiber Lasers Have Spectral Line-Width in the Range

Multiple Choice

The rare-earth-doped fiber lasers have spectral line-width in the range of _________________

A) 0.1 to 1 nm
B) 1.2 to 1.5 nm
C) 6 to 10 nm
D) 2 to 2.3 nm