{"id":358,"date":"2025-08-27T20:11:56","date_gmt":"2025-08-27T11:11:56","guid":{"rendered":"https:\/\/www.hulinks.co.jp\/en\/?page_id=358"},"modified":"2025-10-07T17:37:53","modified_gmt":"2025-10-07T08:37:53","slug":"8-skip-0","status":"publish","type":"page","link":"https:\/\/www.hulinks.co.jp\/en\/tfcalc\/examples\/list-of-coating-design\/8-skip-0\/","title":{"rendered":"8-Skip-0 WDM Filter"},"content":{"rendered":"\n<h1 class=\"wp-block-heading is-style-nostyle\">List of coating design exapmles<\/h1>\n\n\n\n<h2 class=\"wp-block-heading is-style-bottomline\">A 8-Skip-0 WDM Filter<\/h2>\n\n\n\n<p>An 8-skip-0 WDM filter is capable of adding or dropping 8 channels of a 100-GHz spacing fiberoptic telecommunication system. The design we present has the following specifications:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>centered at 1550 nm,<\/li>\n\n\n\n<li>passband width of 6.0 nm at the -0.5 dB (about 89%) transmission level,<\/li>\n\n\n\n<li>bandwidth of 6.8 nm at the -25 dB (about 0.3%) transmission level,<\/li>\n\n\n\n<li>0.1% ripple in the passband<\/li>\n\n\n\n<li>materials H (index 2.065) and L (index 1.47)<\/li>\n<\/ul>\n\n\n\n<p>TFCalc 3.5 has the capability of designing narrow bandpass (NPB) filters using the prototype method. To obtain the steep edges required in this design, we used 13 cavities. After a few minutes, TFCalc produced a design whose performance is shown below.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"454\" height=\"311\" src=\"https:\/\/www.hulinks.co.jp\/en\/wp-content\/uploads\/sites\/2\/software\/tfcalc\/tf_8skip0_1.gif\" alt=\"\" class=\"wp-image-357\" \/><\/figure><\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>The design\u2019s width at the -25 dB level is 6.7 nm, which is better than required. The stack formula for this 303-layer design is<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>HLHLHLHL 3H\n2L\nHLH 3L HLHLHL 3H LHLHLHL 3H LH\n2L\nHLHLHLH 3L HLH 3L HLHLHLH 3L HL 3H\n2L\n3H LHLHLH 3L HLH 3L HLHLH 3L HLHL 3H\n2L\nH 3L HLHLHLH 3L H 3L HLHLHLHLH 3L 3H\n2L\n3H LH 3L HLHLHLH 3L HLHLH 3L HLHL 3H\n2L\n3H LHLHLHLHLH 3L HLH 3L HLHL 3H L 3H\n2L\n3H L 3H LHLH 3L HLH 3L HLHLHLHLHL 3H\n2L\n3H LHLH 3L HLHLH 3L HLHLHLH 3L HL 3H\n2L\n3H 3L HLHLHLHLH 3L H 3L HLHLHLH 3L H\n2L\n3H LHLH 3L HLHLH 3L HLH 3L HLHLHL 3H\n2L\n3H LH 3L HLHLHLH 3L HLH 3L HLHLHLH\n2L\nHL 3H LHLHLHL 3H LHLHLH 3L HLH\n2L\n3H LHLHLHLH<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>List of coating design exapmles A 8-Skip-0 WDM Filter An 8-skip-0 WDM filter is capable of adding or dropping 8 channels of a 100-GHz spacing fiberoptic telecommunication system. The design we present has the following specifications: TFCalc 3.5 has the capability of designing narrow bandpass (NPB) filters using the prototype method. To obtain the steep&#8230;<\/p>\n","protected":false},"author":15,"featured_media":0,"parent":258,"menu_order":32,"comment_status":"closed","ping_status":"closed","template":"liquid.php","meta":{"footnotes":""},"tags":[],"class_list":["post-358","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/pages\/358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/users\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/comments?post=358"}],"version-history":[{"count":5,"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/pages\/358\/revisions"}],"predecessor-version":[{"id":694,"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/pages\/358\/revisions\/694"}],"up":[{"embeddable":true,"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/pages\/258"}],"wp:attachment":[{"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/media?parent=358"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hulinks.co.jp\/en\/wp-json\/wp\/v2\/tags?post=358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}