{"id":209242,"date":"2024-03-21T14:06:48","date_gmt":"2024-03-21T14:06:48","guid":{"rendered":"https:\/\/www.electricity-magnetism.org\/%e5%81%8f%e6%b3%a2%e3%83%a2%e3%83%bc%e3%83%89%e5%88%86%e6%95%a3%ef%bc%88pmd%ef%bc%89%e6%96%b9%e7%a8%8b%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/"},"modified":"2024-05-17T15:09:24","modified_gmt":"2024-05-17T15:09:24","slug":"%e5%81%8f%e6%b3%a2%e3%83%a2%e3%83%bc%e3%83%89%e5%88%86%e6%95%a3%ef%bc%88pmd%ef%bc%89%e6%96%b9%e7%a8%8b%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.electricity-magnetism.org\/ja\/%e5%81%8f%e6%b3%a2%e3%83%a2%e3%83%bc%e3%83%89%e5%88%86%e6%95%a3%ef%bc%88pmd%ef%bc%89%e6%96%b9%e7%a8%8b%e5%bc%8f-%e8%a7%a3%e8%aa%ac%e3%81%a8%e8%a8%88%e7%ae%97%e6%96%b9%e6%b3%95\/","title":{"rendered":"\u504f\u6ce2\u30e2\u30fc\u30c9\u5206\u6563\uff08PMD\uff09\u65b9\u7a0b\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5"},"content":{"rendered":"<p class=\"sidekick\">\u504f\u6ce2\u30e2\u30fc\u30c9\u5206\u6563\uff08PMD\uff09\u306f\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u901a\u4fe1\u306b\u304a\u3044\u3066\u3001\u7570\u306a\u308b\u504f\u6ce2\u72b6\u614b\u306e\u5149\u4fe1\u53f7\u304c\u7570\u306a\u308b\u901f\u5ea6\u3067\u4f1d\u64ad\u3057\u6642\u9593\u9045\u5ef6\u3084\u4fe1\u53f7\u6b6a\u307f\u3092\u5f15\u304d\u8d77\u3053\u3059\u73fe\u8c61\u3067\u3059\u3002<\/p>\n<h2>\u504f\u6ce2\u30e2\u30fc\u30c9\u5206\u6563\uff08PMD\uff09\u65b9\u7a0b\u5f0f | \u89e3\u8aac\u3068\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\n\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u901a\u4fe1\u306b\u304a\u3044\u3066\u3001\u504f\u6ce2\u30e2\u30fc\u30c9\u5206\u6563\uff08Polarization Mode Dispersion, PMD\uff09\u306f\u3001\u30c7\u30fc\u30bf\u4f1d\u9001\u306e\u54c1\u8cea\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u91cd\u8981\u306a\u73fe\u8c61\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001PMD\u306e\u57fa\u672c\u6982\u5ff5\u3001PMD\u65b9\u7a0b\u5f0f\u306e\u5c0e\u51fa\u3001\u304a\u3088\u3073\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\n<\/p>\n<h2>\u504f\u6ce2\u30e2\u30fc\u30c9\u5206\u6563\uff08PMD\uff09\u3068\u306f\uff1f<\/h2>\n<p>\nPMD\u306f\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u3092\u901a\u3063\u3066\u4f1d\u9001\u3055\u308c\u308b\u5149\u4fe1\u53f7\u304c\u7570\u306a\u308b\u504f\u6ce2\u72b6\u614b\uff08\u30e2\u30fc\u30c9\uff09\u3067\u7570\u306a\u308b\u901f\u5ea6\u3067\u4f1d\u64ad\u3059\u308b\u73fe\u8c61\u3092\u6307\u3057\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30d5\u30a1\u30a4\u30d0\u30fc\u5185\u306e\u4fe1\u53f7\u306e\u6642\u9593\u9045\u5ef6\u3092\u5f15\u304d\u8d77\u3053\u3057\u3001\u7d50\u679c\u3068\u3057\u3066\u4fe1\u53f7\u306e\u6b6a\u307f\u3092\u3082\u305f\u3089\u3057\u307e\u3059\u3002PMD\u306f\u9577\u8ddd\u96e2\u4f1d\u9001\u306b\u304a\u3044\u3066\u7279\u306b\u554f\u984c\u3068\u306a\u308a\u3001\u901a\u4fe1\u54c1\u8cea\u306e\u4f4e\u4e0b\u3084\u30c7\u30fc\u30bf\u306e\u8aa4\u308a\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\n<\/p>\n<h2>PMD\u65b9\u7a0b\u5f0f\u306e\u5c0e\u51fa<\/h2>\n<p>\nPMD\u3092\u5b9a\u91cf\u5316\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u65b9\u7a0b\u5f0f\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\uff1a\n<\/p>\n<p>\n\\[ D_{PMD} = \\frac{\\Delta\\tau}{\\sqrt{L}} \\]\n<\/p>\n<p>\n\u3053\u3053\u3067\uff1a<\/p>\n<ul>\n<li> \\( D_{PMD} \\) \u306fPMD\u4fc2\u6570\uff08ps\/\\sqrt{km}\uff09<\/li>\n<li> \\( \\Delta\\tau \\) \u306f\u9045\u5ef6\u6642\u9593\u5dee\uff08ps\uff09<\/li>\n<li> \\( L \\) \u306f\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u9577\u3055\uff08km\uff09<\/li>\n<\/ul>\n<p>\n\u3053\u306e\u65b9\u7a0b\u5f0f\u306f\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u5185\u3067\u306e\u504f\u6ce2\u30e2\u30fc\u30c9\u9593\u306e\u30a4\u30d9\u30f3\u30c8\u3054\u3068\u306e\u6642\u9593\u9045\u5ef6\u306e\u3070\u3089\u3064\u304d\u3092\u8868\u3059\u3082\u306e\u3067\u3042\u308a\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u9577\u3055\u306e\u5e73\u65b9\u6839\u306b\u4f9d\u5b58\u3057\u307e\u3059\u3002\n<\/p>\n<h2>\u8a08\u7b97\u65b9\u6cd5<\/h2>\n<p>\n\u5177\u4f53\u7684\u306a\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u9045\u5ef6\u6642\u9593\u5dee \\( \\Delta\\tau \\) \u304c2 ps\u3067\u3001\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u9577\u3055 \\( L \\) \u304c100 km\u3067\u3042\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3059\u3002PMD\u4fc2\u6570 \\( D_{PMD} \\) \u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u8a08\u7b97\u3067\u304d\u307e\u3059\u3002\n<\/p>\n<p>\n\\[ D_{PMD} = \\frac{2 \\text{ ps}}{\\sqrt{100 \\text{ km}}} \\]\n<\/p>\n<p>\n\u6b21\u306b\u3001\u5e73\u65b9\u6839\u3092\u8a08\u7b97\u3057\u307e\u3059\uff1a\n<\/p>\n<p>\n\\[ \\sqrt{100 \\text{ km}} = 10 \\text{ km}^{1\/2} \\]\n<\/p>\n<p>\n\u3057\u305f\u304c\u3063\u3066\u3001\n<\/p>\n<p>\n\\[ D_{PMD} = \\frac{2 \\text{ ps}}{10 \\text{ km}^{1\/2}} = 0.2 \\text{ ps\/km}^{1\/2} \\]\n<\/p>\n<p>\n\u3053\u306e\u7d50\u679c\u3001PMD\u4fc2\u6570\u306f0.2 ps\/km<sup>1\/2<\/sup>\u3068\u306a\u308a\u307e\u3059\u3002\n<\/p>\n<h2>PMD\u306e\u5f71\u97ff\u3068\u5bfe\u7b56<\/h2>\n<p>\nPMD\u306f\u9ad8\u5468\u6ce2\u4fe1\u53f7\u3084\u5e83\u5e2f\u57df\u901a\u4fe1\u306b\u304a\u3044\u3066\u7279\u306b\u554f\u984c\u3068\u306a\u308b\u305f\u3081\u3001\u305d\u306e\u5bfe\u7b56\u304c\u91cd\u8981\u3067\u3059\u3002PMD\u306e\u5f71\u97ff\u3092\u6291\u3048\u308b\u305f\u3081\u306e\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u304c\u3042\u308a\u307e\u3059\uff1a\n<\/p>\n<ul>\n<li>\u9ad8\u54c1\u8cea\u306a\u30d5\u30a1\u30a4\u30d0\u30fc\u306e\u4f7f\u7528\uff1aPMD\u4fc2\u6570\u306e\u4f4e\u3044\u30d5\u30a1\u30a4\u30d0\u30fc\u3092\u9078\u5b9a\u3059\u308b\u3002<\/li>\n<li>\u30af\u30ed\u30b9\u30dd\u30fc\u30e9\u30ea\u30bc\u30fc\u30b7\u30e7\u30f3\uff1a\u7570\u306a\u308b\u504f\u6ce2\u72b6\u614b\u306b\u304a\u3051\u308b\u4fe1\u53f7\u306e\u6df7\u5408\u3092\u9632\u3050\u6280\u8853\u3002<\/li>\n<li>PMD\u88dc\u511f\u88c5\u7f6e\uff1a\u5149\u4fe1\u53f7\u306e\u6b6a\u307f\u3092\u88dc\u6b63\u3059\u308b\u88c5\u7f6e\u3092\u5229\u7528\u3059\u308b\u3002<\/li>\n<\/ul>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\nPMD\u306f\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u901a\u4fe1\u306b\u304a\u3051\u308b\u4e3b\u8981\u306a\u8ab2\u984c\u306e\u4e00\u3064\u3067\u3042\u308a\u3001\u9069\u5207\u306a\u7406\u89e3\u3068\u8a08\u7b97\u65b9\u6cd5\u3092\u6301\u3064\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f\u3001PMD\u306e\u57fa\u672c\u6982\u5ff5\u3001PMD\u65b9\u7a0b\u5f0f\u306e\u5c0e\u51fa\u3001\u304a\u3088\u3073\u305d\u306e\u8a08\u7b97\u65b9\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3057\u305f\u3002PMD\u3092\u6b63\u3057\u304f\u7ba1\u7406\u3057\u3001\u5f71\u97ff\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b\u3053\u3068\u3067\u3001\u901a\u4fe1\u54c1\u8cea\u306e\u5411\u4e0a\u304c\u671f\u5f85\u3067\u304d\u307e\u3059\u3002\n<\/p>\n<p>\n\u4ee5\u4e0a\u306e\u5185\u5bb9\u304c\u3001\u8aad\u8005\u306e\u7686\u3055\u3093\u306b\u3068\u3063\u3066\u5f79\u7acb\u3064\u3053\u3068\u3092\u9858\u3063\u3066\u3044\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u901a\u4fe1\u306e\u4e16\u754c\u306b\u8208\u5473\u3092\u6301\u3063\u3066\u3044\u305f\u3060\u3051\u308c\u3070\u5e78\u3044\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u504f\u6ce2\u30e2\u30fc\u30c9\u5206\u6563\uff08PMD\uff09\u306f\u5149\u30d5\u30a1\u30a4\u30d0\u30fc\u901a\u4fe1\u306b\u304a\u3044\u3066\u3001\u7570\u306a\u308b\u504f\u6ce2\u72b6\u614b\u306e\u5149\u4fe1\u53f7\u304c\u7570\u306a\u308b\u901f\u5ea6\u3067\u4f1d\u64ad\u3057\u6642\u9593\u9045\u5ef6\u3084\u4fe1\u53f7\u6b6a\u307f\u3092\u5f15\u304d\u8d77\u3053\u3059\u73fe\u8c61\u3067\u3059\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","footnotes":""},"categories":[96],"tags":[97],"class_list":["post-209242","post","type-post","status-publish","format-standard","hentry","category-96","tag-97","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"yoast_head":"<!-- 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