{"id":966,"date":"2019-06-04T16:01:22","date_gmt":"2019-06-04T16:01:22","guid":{"rendered":"https:\/\/labsites.wdev.rochester.edu\/agrawal\/?page_id=966"},"modified":"2020-12-17T19:59:25","modified_gmt":"2020-12-17T19:59:25","slug":"optical-communications","status":"publish","type":"page","link":"https:\/\/sites.rochester.edu\/agrawal\/current-research\/optical-communications\/","title":{"rendered":"Optical Communications"},"content":{"rendered":"\n

Space-Division Multiplexing<\/span><\/strong><\/h2>\n\n\n\n

Multimode and multicore fibers are attracting attention for enhancing the capacity of optical communication systems through a new type of multiplexing known as the mode-division or space-division multiplexing (SDM). A NSF-funded project in my group (grant ECCS-1505636) has focused on studying the nonlinear effects inside multimode\/multicore fibers and study their impact on the performance of SDM systems. The figure below shows the SDM scheme schematically.<\/p>\n\n\n\n

\"\"
Schematic of the SDM technique. A spatial multiplexer is used to combine several WDM signals and launch them into different cores or modes of an optical fiber. Source: G. P> Agrawal, Fiber-Optic Communication Systems, 5th ed. (Wiley, 2021)<\/figcaption><\/figure><\/div>\n\n\n\n

Simulations for Multicore SDM systems<\/span><\/strong><\/h2>\n\n\n\n

In a 2014 study, numerical simulations were used to include both the linear and nonlinear
couplings among the cores of a multicore fiber. The simulated 1000-km-long SDM system transmitted 114-Gb\/s symbol streams through each core in the QPSK format with polarization-division multiplexing (PDM). Digital signal processing was used at the receiving end to remove all linear impairments. Figure shows the calculated bit-error rate (BER) as a function of optical signal-to-noise ratio (OSNR) for fibers up to 19 cores. The increase in the OSNR at a fixed BER is called the OSNR penalty. The results indicated that linear coupling between the cores of a MCF actually improves the performance of a MCF-based SDM system. Experiments have confirmed this prediction.<\/p>\n\n\n\n

\"\"
Computed bit-error rate (BER) as a function of Optical SNR for a multicore SDM system showing a reduced power penalty as the number of core increases. Source: IEEE Photonics Society Summer Topical Meetings,
2014, DOI: 10.1109\/SUM.2014.96.<\/figcaption><\/figure>\n\n\n\n

For a list of recent publications, visit our publications page<\/a>.<\/h3>\n","protected":false},"excerpt":{"rendered":"

Space-Division Multiplexing Multimode and multicore fibers are attracting attention for enhancing the capacity of optical communication systems through a new type of multiplexing known as the mode-division or space-division multiplexing…<\/p>\n","protected":false},"author":0,"featured_media":0,"parent":646,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-966","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nOptical Communications - Agrawal Research Group<\/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:\/\/sites.rochester.edu\/agrawal\/current-research\/optical-communications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Optical Communications - Agrawal Research Group\" \/>\n<meta property=\"og:description\" content=\"Space-Division Multiplexing Multimode and multicore fibers are attracting attention for enhancing the capacity of optical communication systems through a new type of multiplexing known as the mode-division or space-division multiplexing…\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites.rochester.edu\/agrawal\/current-research\/optical-communications\/\" \/>\n<meta property=\"og:site_name\" content=\"Agrawal Research Group\" \/>\n<meta property=\"article:modified_time\" content=\"2020-12-17T19:59:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sites.rochester.edu\/agrawal\/wp-content\/uploads\/2020\/12\/sdm1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"630\" \/>\n\t<meta property=\"og:image:height\" content=\"305\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sites.rochester.edu\\\/agrawal\\\/current-research\\\/optical-communications\\\/\",\"url\":\"https:\\\/\\\/sites.rochester.edu\\\/agrawal\\\/current-research\\\/optical-communications\\\/\",\"name\":\"Optical Communications - 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