{"id":390672,"date":"2024-10-21T14:31:40","date_gmt":"2024-10-21T14:31:40","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/the-error-in-measure-of-optical-power-meter\/"},"modified":"2024-10-21T14:31:40","modified_gmt":"2024-10-21T14:31:40","slug":"the-error-in-measure-of-optical-power-meter","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/the-error-in-measure-of-optical-power-meter\/","title":{"rendered":"the error in measure of optical power meter"},"content":{"rendered":"<p>&lt;div&gt;How to measure optical power in a reversible light path ? Is the measured optical power going or returning? Also shown in the picture, there is no other device such as waveguide connected between the two ports, but the power difference is huge. port1 shows a power of -100dBm, which is supposed to be the minimum measurement sensitivity, while the power of port2 port is 12.01dBm. May I ask what is going on?&lt;\/div&gt;&lt;div&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/21-10-2024-1729521093-mceclip0.png\" \/>&lt;\/div&gt;<\/p>\n","protected":false},"template":"","class_list":["post-390672","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"How to measure optical power in a reversible light path ? Is the measured optical power going or returning? Also shown in the picture, there is no other device such as waveguide connected between the two ports, but the power difference is huge. port1 shows a power of -100dBm, which is supposed to be the\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/the-error-in-measure-of-optical-power-meter\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"the error in measure of optical power meter | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"How to measure optical power in a reversible light path ? Is the measured optical power going or returning? Also shown in the picture, there is no other device such as waveguide connected between the two ports, but the power difference is huge. port1 shows a power of -100dBm, which is supposed to be the\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/the-error-in-measure-of-optical-power-meter\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/21-10-2024-1729521093-mceclip0.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/21-10-2024-1729521093-mceclip0.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-10-21T14:31:40+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-10-21T14:31:40+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"the error in measure of optical power meter | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"How to measure optical power in a reversible light path ? Is the measured optical power going or returning? Also shown in the picture, there is no other device such as waveguide connected between the two ports, but the power difference is huge. port1 shows a power of -100dBm, which is supposed to be the\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/10\/21-10-2024-1729521093-mceclip0.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/the-error-in-measure-of-optical-power-meter\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/the-error-in-measure-of-optical-power-meter\\\/#listItem\",\"name\":\"the error in measure of optical power meter\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/the-error-in-measure-of-optical-power-meter\\\/#listItem\",\"position\":3,\"name\":\"the error in measure of optical power meter\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/the-error-in-measure-of-optical-power-meter\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/the-error-in-measure-of-optical-power-meter\\\/\",\"name\":\"the error in measure of optical power meter | Ansys Learning Forum\",\"description\":\"How to measure optical power in a reversible light path ? 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