Usually, it is thought that the lasing wavelength of a FGESL is locked at the Bragg reflection wavelength of fiber grating (FG).

• 由于FGESL的激射波长主要由光纤光栅(FG)的布拉格波长确定，因此选择具有合适布拉格波长的FG就能使FGESL的激射波长处于预置波长处；