en عمومى General پژوهشي Research <p>In this paper, a new structure is provided for the dispersion compensating photonic crystal fibers in order to broaden the chromatic dispersion and increase the dispersion compensating capability in a wide wavelength range. In the structure, putting elliptical holes in the first ring of the inner core clad of a dispersion compensating fiber of the hexagonal lattice, increases the wavelength range of the dispersion compensation, and causes this fiber to have the capability of dispersion compensation in the whole E to U telecommunication bands. In this fiber, the minimal dispersion will be -1006 ps/(nm.km) at the 1.68 &mu;m wavelength and at the 1.55 &mu;m wavelength the dispersion coefficient will be -710 ps/(nm.km). The simulations are all done using the finite difference time domain numerical method.</p> Photonic Crystal Fiber, Dispersion Compensation, Chromatic Dispersion, Negative Dispersion Coefficient. 91 98 http://ijop.ir/browse.php?a_code=A-10-528-2&slc_lang=en&sid=1 Esmat Jafari es.jafari@hotmail.com 10031947532846002354 10031947532846002354 No Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan, Zahedan, Iran Mohammad Ali Mansouri-Birjandi mansouri@ece.usb.ac.ir 10031947532846002355 10031947532846002355 Yes Faculty of Electrical and Computer Engineering, University of Sistan and Baluchestan, Zahedan, Iran