{"id":388,"date":"2014-09-26T06:40:04","date_gmt":"2014-09-26T06:40:04","guid":{"rendered":"http:\/\/www.dkphotonics.com\/blog\/?p=388"},"modified":"2014-09-26T06:41:02","modified_gmt":"2014-09-26T06:41:02","slug":"can-use-single-mode-equipment-multimode-cable-vice-versa","status":"publish","type":"post","link":"https:\/\/www.dkphotonics.com\/blog\/can-use-single-mode-equipment-multimode-cable-vice-versa\/","title":{"rendered":"Can I use single mode equipment over multimode cable and vice versa?"},"content":{"rendered":"<p>This is a question we get many times from our customers. Especially common is a situation, in older installations, back to the times when <a href=\"http:\/\/www.dkphotonics.com\/\">multimode cable<\/a> was cheaper than single mode, and inside buildings, and some last mile installations were planned so, that multimode cables were laid.<\/p>\n<p>Answer is not that easy, to answer simply yes or no. Let\u2019s delve in a details.<\/p>\n<p><strong>Definitions:<\/strong><\/p>\n<ul>\n<li>SONET \u2013 Synchronous Optical Network<\/li>\n<li>SMF \u2013 <a href=\"http:\/\/www.dk-multiplexer.com\/\">SingleMode Fiber<\/a><\/li>\n<li>MMF \u2013 <a href=\"http:\/\/www.dk-lasercomponents.com\/\">MultiMode Fiber<\/a><\/li>\n<li>LED \u2013 Light Emitting Diode<\/li>\n<li>DMD \u2013 Differential Mode Delay<\/li>\n<li>Mode &#8211;<\/li>\n<\/ul>\n<ol>\n<li>light rays entering the fiber at the particular angle;<\/li>\n<li>paths of different length and transmission delays that travel through the cable.<\/li>\n<\/ol>\n<p>SMF is using laser as a source for the light and therefore light beam is very concentrated. It allows higher bandwidth compared to MMF, while having greater transmission distance.<\/p>\n<p>MMF is typically using LEDs for transmission of the optical signal. It is clear from the name, that it uses multiple modes of light at the same time. Entry angles differ for each mode of the light resulting in different speeds and distances that signal can travel.<\/p>\n<p><a href=\"http:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/single-mode-vs-multimode.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-389\" src=\"http:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/single-mode-vs-multimode-600x298.jpg\" alt=\"single-mode-vs-multimode\" width=\"600\" height=\"298\" srcset=\"https:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/single-mode-vs-multimode-600x298.jpg 600w, https:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/single-mode-vs-multimode-300x149.jpg 300w, https:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/single-mode-vs-multimode.jpg 634w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p><strong>Single mode vs Multimode<\/strong><\/p>\n<ol>\n<li>It is possible to interconnect two devices using SMF interface at one end and MMF receiver at another one. But here, many depends also on devices. Like for example ,more sophisticated routers, like Huawei, Alcatel or Cisco while supporting that at physical layer, will not support it at TA. Problem is in DMD that may occur when two different modes are directly coupled. Degradation of the bandwidth also decreases the distance supported for transmission. Also, SMF transmitter should be calibrated in a way so the SMF signal would not overdrive MMF receiver.<\/li>\n<\/ol>\n<p><strong>Solution: <\/strong>Using the intermediate switch with SMF and MMF interfaces that is able to convert the signals is a good alternative.<\/p>\n<ol start=\"2\">\n<li>If you use simple devices, such as video over fiber, or media converters, then it depends, what wavelength are used for your equipment. The trick here is that as we know, single-mode fibers used in telecommunications operate at 1310 or 1550 nm and require bit (now only a little bit) more expensive laser sources, and in older equipment MMF wavelength used were 850 nm.<\/li>\n<\/ol>\n<p>And if you have this kind of transceivers, then it won\u2019t work over your single mode cable. If you have a newer generation media converters, which use 1300 nm lasers, it will most likely work.<\/p>\n<p><a href=\"http:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/Most-common-wavelengths.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-390\" src=\"http:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/Most-common-wavelengths-600x111.png\" alt=\"Most common wavelengths\" width=\"600\" height=\"111\" srcset=\"https:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/Most-common-wavelengths-600x111.png 600w, https:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/Most-common-wavelengths-300x55.png 300w, https:\/\/www.dkphotonics.com\/blog\/wp-content\/uploads\/2014\/09\/Most-common-wavelengths.png 618w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p>Table 1. Most common wavelengths (non WDM,<a href=\"http:\/\/www.dk-multiplexer.com\/\"> CWDM or DWDM<\/a>) used in optical transmission systems.<\/p>\n<p><strong>DK Photonics<\/strong> \u2013 <a href=\"http:\/\/www.dkphotonics.com\">www.dkphotonics.com<\/a>\u00a0 specializes in designing and manufacturing of high quality optical passive components mainly for telecommunication, fiber sensor and fiber laser applications,such as PLC Splitter, WDM, FWDM, CWDM, DWDM, OADM,<a href=\"http:\/\/www.dkphotonics.com\/\">Optical Circulator<\/a>, Isolator, PM Circulator, PM Isolator, Fused Coupler, Fused WDM, Collimator, Optical Switch and Polarization Maintaining Components, Pump Combiner, <a href=\"http:\/\/www.dkphotonics.com\/\">High power isolator<\/a>, Patch Cord and all kinds of connectors.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This is a question we get many times from our customers. Especially common is a situation, in older installations, back to the times when multimode cable was cheaper than single mode, and inside buildings, and some last mile installations were planned so, that multimode cables were laid. Answer is not that easy, to answer simply &hellip; <a href=\"https:\/\/www.dkphotonics.com\/blog\/can-use-single-mode-equipment-multimode-cable-vice-versa\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Can I use single mode equipment over multimode cable and vice versa?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[25,15],"tags":[62],"class_list":["post-388","post","type-post","status-publish","format-standard","hentry","category-fibre-optic-cable","category-optical-fiber","tag-pon"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Can I use single mode equipment over multimode cable and vice versa? - DK Photonics Blog<\/title>\n<meta name=\"description\" content=\"DK Photonics \u2013 www.dkphotonics.com 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