TY - JOUR ID - TI - The Effect of elliptical core on producing modal birefringence (low and high) in the single-mode optical fiber تأثير النواة البيضاوية في إنتاج الانكسار المشروط (منخفض وعالي) في الألياف الضوئية أحادية الوضع AU - Hassan A. Hassan PY - 2020 VL - 3 IS - 3 SP - 5 EP - 12 JO - Dijlah Journal مجلة دجلة SN - 22226583 AB - In this applied theory study presents the results of theoretical investigationof the normalized Birefringence produced in a single - mode optical fiber,when this fiber produced under high accuracy manufacturing process to usesit in long - haul communication field.We suppose (by implying some experimental thesis) that the fiber corecontains a slight ellipticity lies between the range (es = (1-10.01) percent),when the ellipticity comes from a manufacturing process imperfection.We find the induced birefringence is small, then could not affect on thestate of the guided light, but it may causes a limited fluctuation in it in a longfiber distanced.In the other hand when we introduce a large ellipticity (eL = (15-91)percent), intentionally to enhancing the internal geometrical Birefringence. Wefind that the induced birefringence did not satisfied the minimum requiredvalue to design polarization maintaining fibers, this mean that the geometriccontribution alone could not design such a fiber without introduce the otherkind called "stress birefringence".

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