![\"\"](\"https:\/\/vinacap.vn\/wp-content\/uploads\/2023\/06\/ki_thuat_xu_li_tin_hieu_moi_co_the_tang_gap_doi_cu_li_truyen_dan_du_lieu_tren_he_thong_cap_quang-300x162.jpg\")
<\/p>\nM\u1ed9t ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00ed t\u00edn hi\u1ec7u m\u1edbi qua s\u1ee3i c\u00e1p quang \u0111\u00e3 \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u ph\u00e1t tri\u1ec3n th\u00e0nh c\u00f4ng v\u00e0 ph\u01b0\u01a1ng ph\u00e1p n\u00e0y c\u00f3 th\u1ec3 t\u0103ng \u0111\u00e1ng k\u1ec3 c\u1ef1 li truy\u1ec1n d\u1eabn d\u1eef li\u1ec7u kh\u00f4ng sai s\u00f3t (error-free) b\u1eb1ng c\u00e1p ng\u1ea7m tr\u00ean bi\u1ec3n m\u00e0 kh\u00f4ng c\u1ea7n \u0111\u1ebfn c\u00e1c b\u1ed9 khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u.<\/p>\n
\u0110\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u s\u1eed d\u1ee5ng Internet t\u1ed1c \u0111\u1ed9 cao \u0111ang ng\u00e0y m\u1ed9t t\u0103ng, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 t\u1eadp trung t\u0103ng s\u1ed1 l\u01b0\u1ee3ng c\u00e1c k\u00eanh t\u1ea7n s\u1ed1 s\u1eb5n c\u00f3 trong \u0111\u00f3 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c m\u00e3 h\u00f3a d\u01b0\u1edbi d\u1ea1ng t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng \u0111\u01b0\u1ee3c truy\u1ec1n d\u1eabn thay v\u00ec l\u1eafp \u0111\u1eb7t th\u00eam s\u1ee3i c\u00e1p quang. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n qua m\u1ed9t s\u1ed1 nghi\u00ean c\u1ee9u nh\u01b0 c\u00f4ng ngh\u1ec7 m\u00e3 ho\u00e1 d\u1eef li\u1ec7u m\u1edbi c\u1ee7a Trung t\u00e2m c\u00e1c thi\u1ebft b\u1ecb b\u0103ng th\u00f4ng si\u00eau cao cho c\u00e1c h\u1ec7 th\u1ed1ng quang (CUDOS) c\u1ee7a \u00dac hay c\u00f4ng ngh\u1ec7 h\u1ed3ng ngo\u1ea1i c\u1ea3i ti\u1ebfn c\u1ee7a vi\u1ec7n Fraunhofer c\u0169ng nh\u01b0 nhi\u1ec1u ph\u01b0\u01a1ng ph\u00e1p \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 kh\u1eafc ph\u1ee5c t\u00ecnh tr\u1ea1ng kh\u00f4ng tuy\u1ebfn t\u00ednh x\u1ea3y ra khi t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i qu\u00e1 d\u00e0i trong s\u1ee3i c\u00e1p quang.<\/p>\n
Tuy nhi\u00ean, cho d\u00f9 c\u00e1c k\u0129 thu\u1eadt n\u00f3i tr\u00ean \u0111\u00e3 \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n v\u1ec1 kh\u1ea3 n\u0103ng truy\u1ec1n t\u1ea3i v\u00e0 ti\u1ebfp nh\u1eadn \u00e1nh s\u00e1ng m\u00e0 kh\u00f4ng g\u00e2y giao thoa v\u1edbi c\u00e1c t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng k\u1ebf c\u1eadn th\u00ec d\u1eef li\u1ec7u v\u1eabn b\u1ecb sai s\u00f3t bi\u1ebfn d\u1ea1ng (distortion error).<\/p>\n
\u0110\u1ec3 gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u t\u1ea1i \u0111\u1ea1i h\u1ecdc London (UCL) \u0111\u00e3 t\u1ea1o ra m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ng\u0103n ng\u1eeba giao thoa b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng m\u1ed9t b\u1ed9 t\u1ea7n s\u1ed1 \u0111\u01b0\u1ee3c m\u00e3 ho\u00e1 b\u1eb1ng bi\u00ean \u0111\u1ed9, pha v\u00e0 t\u1ea7n s\u1ed1 \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 t\u1ea1o ra m\u1ed9t t\u00edn hi\u1ec7u quang h\u1ecdc ch\u1ea5t l\u01b0\u1ee3ng cao v\u00e0 dung l\u01b0\u1ee3ng c\u1ef1c l\u1edbn.<\/p>\n
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Chi ti\u1ebft h\u01a1n, nh\u00f3m nghi\u00ean c\u1ee9u \u0111\u00e3 s\u1eed d\u1ee5ng m\u1ed9t tia laser \u0111\u1ec3 t\u1ea1o ra m\u1ed9t ph\u1ea7n t\u1eed v\u1eadn chuy\u1ec3n quang h\u1ecdc v\u00e0 \u0111\u01b0a ph\u1ea7n t\u1eed n\u00e0y qua m\u1ed9t m\u00e1y ph\u00e1t t\u00edn hi\u1ec7u l\u01b0\u1ee3c (comb generator – chi\u1ebfc m\u00e1y n\u00e0y c\u00f3 th\u1ec3 t\u1ea1o ra nhi\u1ec1u t\u00edn hi\u1ec7u \u0111\u1ea7u v\u00e0o \u0111i\u1ec1u ho\u00e0 v\u00e0 t\u00edn hi\u1ec7u \u0111\u1ea7u ra hi\u1ec3n th\u1ecb d\u1ea1ng quang ph\u1ed5 tr\u00ean m\u00e0n h\u00ecnh ph\u00e2n t\u00edch kh\u00e1 gi\u1ed1ng v\u1edbi c\u00e1c r\u0103ng l\u01b0\u1ee3c).<\/p>\n
T\u1eeb m\u00e1y ph\u00e1t, ph\u1ea7n t\u1eed h\u00ecnh th\u00e0nh 7 t\u1ea7n s\u1ed1 kho\u1ea3ng c\u00e1ch \u0111\u1ec1u nhau d\u01b0\u1edbi d\u1ea1ng QAM, c\u1ee5 th\u1ec3 l\u00e0 m\u1ed9t si\u00eau k\u00eanh 16 QAM (QAM – Quadrature Amplitude Modulation – \u0111i\u1ec1u ch\u1ebf bi\u00ean \u0111\u1ed9 c\u1ea7u ph\u01b0\u01a1ng hay \u0111i\u1ec1u ch\u1ebf bi\u00ean \u0111\u1ed9 vu\u00f4ng g\u00f3c). T\u00edn hi\u1ec7u si\u00eau k\u00eanh sau \u0111\u00f3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o m\u1ed9t \u0111\u1ea7u c\u1ee7a s\u1ee3i c\u00e1p quang v\u00e0 \u0111\u01b0\u1ee3c thu l\u1ea1i \u1edf \u0111\u1ea7u kia v\u1edbi m\u1ed9t b\u1ed9 thu nh\u1eadn t\u1ed1c \u0111\u1ed9 cao. S\u1eed d\u1ee5ng k\u0129 thu\u1eadt x\u1eed l\u00ed t\u00edn hi\u1ec7u m\u1edbi \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1eb7c th\u00f9 b\u1edfi nh\u00f3m nghi\u00ean c\u1ee9u, t\u00edn hi\u1ec7u d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n \u0111i trong t\u1ea5t c\u1ea3 c\u00e1c k\u00eanh \u0111\u01b0\u1ee3c thu nh\u1eadn v\u1eabn gi\u1eef nguy\u00ean ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 kh\u00f4ng b\u1ecb sai s\u00f3t.<\/p>\n
Ti\u1ebfn s\u0129 Robert Maher \u0111\u1ebfn t\u1eeb khoa k\u0129 thu\u1eadt \u0111i\u1ec7n v\u00e0 \u0111i\u1ec7n t\u1eed t\u1ea1i UCL cho bi\u1ebft: “B\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf s\u1ef1 t\u00e1c \u0111\u1ed9ng qua l\u1ea1i gi\u1eefa c\u00e1c k\u00eanh quang h\u1ecdc, ch\u00fang t\u00f4i \u0111\u00e3 c\u00f3 th\u1ec3 t\u0103ng g\u1ea5p \u0111\u00f4i kho\u1ea3ng c\u00e1ch t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c truy\u1ec1n d\u1eabn m\u00e0 kh\u00f4ng g\u1eb7p sai s\u00f3t, t\u1eeb 3190 km \u0111\u1ebfn 5890 km, \u0111\u00e2y c\u0169ng l\u00e0 c\u1ef1 li l\u1edbn nh\u1ea5t \u0111\u1ea1t \u0111\u01b0\u1ee3c tr\u00ean ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng. Th\u1eed th\u00e1ch \u1edf \u0111\u00e2y l\u00e0 t\u00ecm ra m\u1ed9t k\u0129 thu\u1eadt \u0111\u1ec3 thu nh\u1eadn \u0111\u1ed3ng th\u1eddi m\u1ed9t nh\u00f3m c\u00e1c k\u00eanh quang h\u1ecdc \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi t\u00ean g\u1ecdi si\u00eau k\u00eanh b\u1eb1ng m\u1ed9t \u0111\u1ea7u thu duy nh\u1ea5t.”<\/p>\n
S\u1eed d\u1ee5ng b\u0103ng th\u00f4ng 70 GHz c\u00f3 s\u1eb5n tr\u00ean m\u1ed9t si\u00eau k\u00eanh quang h\u1ecdc, c\u1ef1 li truy\u1ec1n d\u1eabn t\u1ed1i \u0111a m\u00e0 h\u1ec7 th\u1ed1ng \u0111\u1ea1t \u0111\u01b0\u1ee3c trong th\u00ed nghi\u1ec7m \u0111\u01b0\u1ee3c x\u00e1c nh\u1eadn l\u00e0 5890 km. \u0110\u00e2y c\u0169ng l\u00e0 c\u1ef1 li l\u1edbn nh\u1ea5t t\u1eebng \u0111\u1ea1t \u0111\u01b0\u1ee3c khi khai th\u00e1c k\u0129 thu\u1eadt truy\u1ec1n ng\u01b0\u1ee3c k\u0129 thu\u1eadt s\u1ed1 (digital back-propagation – m\u1ed9t k\u0129 thu\u1eadt b\u00f9 tr\u1eeb t\u1ea5t c\u1ea3 c\u00e1c sai s\u00f3t c\u1ee7a s\u1ee3i c\u00e1p trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n t\u1ea3i quang h\u1ecdc, s\u1eed d\u1ee5ng thu\u1eadt to\u00e1n truy\u1ec1n ng\u01b0\u1ee3c k\u0129 thu\u1eadt s\u1ed1).<\/p>\n
N\u1ed1i ti\u1ebfp th\u00e0nh c\u00f4ng trong qu\u00e1 tr\u00ecnh th\u1eed nghi\u1ec7m ph\u01b0\u01a1ng ph\u00e1p m\u1edbi, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u hi\u1ec7n t\u1ea1i \u0111ang c\u00f3 \u00fd \u0111\u1ecbnh t\u00edch h\u1ee3p c\u00e1c k\u0129 thu\u1eadt n\u00e0y v\u00e0o c\u00e1c si\u00eau k\u00eanh m\u1eadt \u0111\u1ed9 d\u00e0y h\u01a1n th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c \u0111\u01b0\u1eddng truy\u1ec1n nh\u01b0 truy\u1ec1n h\u00ecnh c\u00e1p k\u0129 thu\u1eadt s\u1ed1, modem v\u00e0 k\u1ebft n\u1ed1i Ethernet.<\/p>\n
Gi\u00e1o s\u01b0 Polina Bayvel – th\u00e0nh vi\u00ean nh\u00f3m nghi\u00ean c\u1ee9u cho bi\u1ebft: “Ch\u00fang t\u00f4i r\u1ea5t ph\u1ea5n kh\u00edch khi th\u00f4ng b\u00e1o r\u1eb1ng ph\u00e1t hi\u1ec7n quan tr\u1ecdng n\u00e0y s\u1ebd c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u01b0\u1eddng truy\u1ec1n b\u1eb1ng s\u1ee3i quang. Ph\u01b0\u01a1ng ph\u00e1p c\u1ee7a ch\u00fang t\u00f4i s\u1ebd t\u0103ng hi\u1ec7u su\u1ea5t truy\u1ec1n d\u1eabn d\u1eef li\u1ec7u, t\u0103ng g\u1ea7n g\u1ea5p \u0111\u00f4i c\u1ef1 li truy\u1ec1n d\u1eabn c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c v\u00e0 ti\u1ec1m n\u0103ng s\u1ebd ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c r\u1ea5t nhi\u1ec1u chi ph\u00ed tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng c\u00e1p quang th\u01b0\u01a1ng m\u1ea1i m\u1edbi nh\u1ea5t hi\u1ec7n nay. M\u1ed9t trong nh\u1eefng th\u1eed th\u00e1ch l\u1edbn nh\u1ea5t m\u00e0 ch\u00fang t\u00f4i ph\u1ea3i \u0111\u1ed1i m\u1eb7t l\u00e0 l\u00e0m sao duy tr\u00ec k\u1ebft n\u1ed1i v\u1edbi nhu c\u1ea7u Internet \u0111ang ng\u00e0y m\u1ed9t b\u00f9ng n\u1ed5 v\u00e0 vi\u1ec7c kh\u1eafc ph\u1ee5c gi\u1edbi h\u1ea1n dung n\u0103ng c\u1ee7a c\u00e1c s\u1ee3i c\u00e1p quang l\u00e0 m\u1ed9t c\u00e1ch \u0111\u1ec3 \u0111\u1ed1i \u0111\u1ea7u v\u1edbi th\u1eed th\u00e1ch n\u00e0y.”<\/p>","protected":false},"featured_media":5319,"parent":0,"menu_order":0,"template":"","tags":[],"category-news":[103],"class_list":["post-5318","tin-tuc","type-tin-tuc","status-publish","has-post-thumbnail","hentry","category-news-tin-cong-ty"],"acf":[],"_links":{"self":[{"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/tin-tuc\/5318","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/tin-tuc"}],"about":[{"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/types\/tin-tuc"}],"version-history":[{"count":1,"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/tin-tuc\/5318\/revisions"}],"predecessor-version":[{"id":7492,"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/tin-tuc\/5318\/revisions\/7492"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/media\/5319"}],"wp:attachment":[{"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/media?parent=5318"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/tags?post=5318"},{"taxonomy":"category-news","embeddable":true,"href":"https:\/\/vinacap.vn\/zh\/wp-json\/wp\/v2\/category-news?post=5318"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}