en The Influence of Variation in Effective Parameters on Confinement Loss In Photonic Crystal Fibres تخصصی Special پژوهشي Research In this research , the impressions of both rising the number of edges in cladding region ( from square – lattice up to nano structure) and the number of air rings as well as variation in the used telecomm wavelengths on the confinement loss for large amounts of air-filling fraction are studied . The achievements show extra increasing the number of edges cannot be beneficial so that it rises the loss . Also , it is obtained that the increment of the air – filing fraction can reduce and revise the amount of loss considerably for all considered structures . In this research , the impressions of both rising the number of edges in cladding region ( from square – lattice up to nano structure) and the number of air rings as well as variation in the used telecomm wavelengths on the confinement loss for large amounts of air-filling fraction are studied . The achievements show extra increasing the number of edges cannot be beneficial so that it rises the loss . Also , it is obtained that the increment of the air – filing fraction can reduce and revise the amount of loss considerably for all considered structures . large air – filing fraction ( d/Λ ) values , number of air rings , number of edges in cladding region , confinement loss large air – filing fraction ( d/Λ ) values , number of air rings , number of edges in cladding region , confinement loss 517 520 http://opsi.ir/browse.php?a_code=A-10-1-227&slc_lang=en&sid=1 Akbar zendehnam Akbar zendehnam A-ZENDEHNAM@ARAKU.AC.IR 10031947532846002097 10031947532846002097 No Department of physics, Science faculty , University of Arak – Arak , P.O. Box : 38156 - 879 Department of physics, Science faculty , University of Arak – Arak , P.O. Box : 38156 - 879 Maryam hosseinpour Maryam hosseinpour maryamhosseinpour35@yahoo.com 10031947532846002098 10031947532846002098 Yes Department of physics, Science faculty , University of Arak – Arak , P.O. Box : 38156 - 879 Department of physics, Science faculty , University of Arak – Arak , P.O. Box : 38156 - 879