Naoki Hashizume, Hideyuki Nasu
Fiber grating lasers have been theoretically investigated. Stabilizing the conditions of the lasing wavelength of fiber grating lasers against temperature change is discussed on the basis of mode-hopping control. It is shown that, to reduce irregular and large-jump mode hopping, which originate in the longitudinal modes of the semiconductor optical amplifier chip, the front facet reflectivity of the chip should be less than 0.05 %. Two approaches to controlling mode hopping are proposed: extending the temperature period and reducing the wavelength change of hopping.