{"id":691248,"date":"2024-11-06T05:24:57","date_gmt":"2024-11-06T05:24:57","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/tia-455-191-b2003-r2013\/"},"modified":"2024-11-06T05:24:57","modified_gmt":"2024-11-06T05:24:57","slug":"tia-455-191-b2003-r2013","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/tia\/tia-455-191-b2003-r2013\/","title":{"rendered":"TIA-455-191-B:2003 (R2013)"},"content":{"rendered":"<p>This part of IEC 60793 establishes uniform requirements for<br \/>\nmeasuring the mode field diameter (MFD) of optical fibre, thereby<br \/>\nassisting in the inspection of fibres and cables for commercial<br \/>\npurposes.<\/p>\n<p>The MFD represents a measure of the transverse extent of the<br \/>\nelectromagnetic field intensity of the mode in a fibre cross<br \/>\nsection, and it is defined from the far-field intensity<br \/>\ndistribution as a ratio of integrals known as the Petermann II<br \/>\ndefinition. See equation (1).<\/p>\n<p>The definitions of MFD are strictly related to the measurement<br \/>\nconfigurations. The mathematical equivalence of these definitions<br \/>\nresults from transform relationships between measurement results<br \/>\nobtained by different implementations summarized in figure 1 as<br \/>\nfollows:<\/p>\n<p>Four methods are described for measuring MFD:<\/p>\n<p>\u2013 method A: direct far-field scan;<\/p>\n<p>\u2013 method B: variable aperture in the far field;<\/p>\n<p>\u2013 method C: near-field scan;<\/p>\n<p>\u2013 method D: bi-directional backscatter using an optical time<br \/>\ndomain reflectometer (OTDR).<\/p>\n<p>All four methods apply to all categories of type B single-mode<br \/>\nfibre shown in IEC 60793- 2 and operating near 1 310 nm or 1 550<br \/>\nnm. Method D is not recommended for the measurement of fibres of<br \/>\nunknown type or design.<\/p>\n<p>Information common to all four methods is contained in clauses 1<br \/>\nto 8, and information pertaining to each individual method appears<br \/>\nin annexes A, B, C and D, respectively.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>FOTP-191 IEC-60793-1-45 Optical Fibers &#8211; Part 1-45: Measurement Methods and Test Procedures &#8211; Mode Field Diameter<\/b><\/p>\n<table style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/tia\/\"><b>TIA<\/b><\/a><\/td>\n<td>2003<\/td>\n<td>40<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":691260,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2646],"product_tag":[],"class_list":{"0":"post-691248","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-tia","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/691248","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/691260"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=691248"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=691248"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=691248"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}