A novel approach to pulse shaping using a phase-modulated fiber Bragg grating (FBG) in transmission is proposed and designed. We show that phase-modulated FBGs can provide transmission responses suitable for pulse shaping applications, offering important technological feasibility benefits, since the coupling strength remains basically uniform in the grating. Moreover, this approach retains the substantial advantages of FBGs in transmission, such as optimum energy efficiency, no requirement for an optical circulator, and robustness against fabrication errors.
Preciado, M. A., Shu, X., & Sugden, K. (2012). Proposal and design of phase-modulated fiber gratings in transmission for pulse shaping. Optics Letters, 38(1), 70-72. https://doi.org/10.1364/OL.38.000070