{"id":17859,"date":"2023-06-05T06:30:28","date_gmt":"2023-06-05T06:30:28","guid":{"rendered":"https:\/\/www.tarluz.com\/?p=17859"},"modified":"2023-06-05T06:35:50","modified_gmt":"2023-06-05T06:35:50","slug":"introduction-to-o-band-wdm","status":"publish","type":"post","link":"https:\/\/www.tarluz.com\/ru\/data-transmission\/introduction-to-o-band-wdm\/","title":{"rendered":"Introduction to O-band WDM"},"content":{"rendered":"<p>WDM helps the network operators to run several transmission wavelengths on the same pair of optical fiber, it increases the bandwidth capacity among sites. The O-band WDM wavelengths range between 1260nm and 1360nm, compared with C-band featured with lower attenuation, and higher chromatic dispersion, it features a very low chromatic dispersion, but a higher attenuation per kilometer.<img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-17867 size-full\" src=\"https:\/\/www.tarluz.com\/wp-content\/uploads\/2023\/06\/O-band-wavelengths-range.jpg\" alt=\"\" width=\"600\" height=\"218\" srcset=\"https:\/\/www.tarluz.com\/wp-content\/uploads\/2023\/06\/O-band-wavelengths-range.jpg 600w, https:\/\/www.tarluz.com\/wp-content\/uploads\/2023\/06\/O-band-wavelengths-range-300x109.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>O-band was the \u201coriginal\u201d band, the first for which we learned how to build lasers and detectors. Over time, the very low chromatic dispersion has allowed the use of particularly cheap laser sources, making O-band the preferred choice for short-reach optical interconnects, for which the higher attenuation per km is not a problem.<\/p>\n<p>O-band solutions provide an easy and economical method for migrating to 100 Gb\/s and is dedicated to access and mobile base station uplink network. Using O-band-based multiplexers and modules allows operators to cover distances of up to 30km, while maintaining their required passive infrastructure for easier management and lower energy consumption.<\/p>\n<p>The following are some O-Band wavelength plan considerations in the network<br \/>\n\u2022 Low dispersion in O-Band allows simple 25G NRZ transmission without the need for dispersion compensation.<br \/>\n\u2013 25G DML transmission is possible in O- Band (up to ~1320nm)<br \/>\n\u2013 25G EML transmission is possible in O+ Band (up to 1360nm)<br \/>\n\u2022 25G O-Band sources and filters exist that can be used directly or adapted for higher power operation for NG-EPON.<br \/>\n\u2013 Cooled 25G DML\/EML TOSAs for 100GBASE-LR4 (~1295-1309nm, 800GHz grid)<br \/>\n\u2013 Uncooled 25G DML TOSAs for 100G-CWDM4 (1270-1330nm, 20nm grid)<br \/>\n\u2022 Spectrum is tight due to the need to coexist with 10G-EPON US (UpStream) at 1260-1280nm and avoid the zero dispersion at1302-1324nm to avoid FWM penalties.<br \/>\n\u2013 Forces use of narrow LAN-WDM channel spacing and narrow US-DS diplexing filters which is not ideal for low cost due to the need for collimated beams.<br \/>\n\u2013 Prevents the full adoption of the existing 100GBASE-LR4 grid due to FWM (Four-wave mixing).<br \/>\n\u2022 High-loss PMDs will require optical amplification. SOAs must be used for amplification in O-Band, but are not as ideal as EDFAs in C\/L-Band.<br \/>\n\u2013 SOA booster amps have more limited output saturation power than EDFAs<br \/>\n\u2013 SOA pre-amps have considerably higher noise figures than EDFAs<\/p>\n","protected":false},"excerpt":{"rendered":"<p>WDM helps the network operators to run several transmission wavelengths on the same pair of optical fiber, it increases the bandwidth capacity among sites. The O-band WDM wavelengths range between 1260nm and 1360nm, compared with C-band featured with lower attenuation, and higher chromatic dispersion, it features a very low chromatic dispersion, but a higher attenuation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":17867,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[],"class_list":["post-17859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-data-transmission"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Introduction to O-band WDM - TARLUZ - FIBER OPTIC SUPPLIERS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.tarluz.com\/ru\/data-transmission\/introduction-to-o-band-wdm\/\" \/>\n<meta property=\"og:locale\" content=\"ru_RU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction to O-band WDM\" \/>\n<meta property=\"og:description\" content=\"WDM helps the network operators to run several transmission wavelengths on the same pair of optical fiber, it increases the bandwidth capacity among sites. 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