A comprehensive study on the transient response of fiber-grating Fabry-Perot (FGFP) laser is numerically conducted. Fiber Bragg grating (FBG) is used as a wavelength selective element to control the external optical feedback (OFB) level. In addition to the external OFB level. the effect of other external cavity parameters such as temperature. https://fitnessgravesyardes.shop/product-category/left-endcap/