en نانوفوتونیک و ساختارهای نانویی Nanophotonics and Nanostructures پژوهشي Research <span style="font-size:10.0pt"><span new="" roman="" style="font-family:" times="">In this article, we provide a theoretical investigation into the reshaping of flat-top pulses in a one-dimensional, homogeneous, isotropic, finite-size photonic crystal with two defect layers. We use Fourier transform to find frequency and time spectra, and transfer matrix to determine transmission spectra to find the average duration and power of the output pulse. The pulses with a carrier frequency near the defect mode center and a wide frequency spectrum, undergo the most significant reshaping. Reshaping is strongest for narrow pulses with a carrier frequency at defect mode peaks. The maximum power and duration of the output pulse of a spectrally narrow pulse are all proportional to the pulse duration and exhibit extremes at the frequencies of the defect mode peaks. The power and average duration of a spectrally wide pulse&#39;s output pulse are not affected by the carrier frequency.</span></span> Reshaping, Time Envelope, Flat-Top, Fourier Transform, Photonic Crystal, Transfer Matrix, Transmission, Defect Mode, Carrier Frequency, Duration. 57 64 http://ijop.ir/browse.php?a_code=A-10-951-1&slc_lang=en&sid=1 Sarah Bolandnazar sarahbnazar@gmail.com 10031947532846004950 10031947532846004950 Yes Department of Physics, University of Tabriz, Tabriz, Iran Samad Roshan Entezar s-roshan@tabrizu.ac.ir 10031947532846004951 10031947532846004951 No Department of Physics, University of Tabriz, Tabriz, Iran