{"id":4215,"date":"2025-08-09T09:39:40","date_gmt":"2025-08-09T09:39:40","guid":{"rendered":"https:\/\/commmesh.com\/?p=4215"},"modified":"2025-08-19T10:20:53","modified_gmt":"2025-08-19T10:20:53","slug":"what-is-wavelength-division-multiplexing-wdm","status":"publish","type":"post","link":"https:\/\/commmesh.com\/vi\/what-is-wavelength-division-multiplexing-wdm\/","title":{"rendered":"Ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng (WDM) l\u00e0 g\u00ec: H\u01b0\u1edbng d\u1eabn k\u1ef9 thu\u1eadt"},"content":{"rendered":"<p>M\u1ea1ng l\u01b0\u1edbi c\u00e1p quang to\u00e0n c\u1ea7u, v\u1edbi t\u1ed5ng chi\u1ec1u d\u00e0i h\u01a1n 1,8 tri\u1ec7u km t\u00ednh \u0111\u1ebfn n\u0103m 2025, d\u1ef1a v\u00e0o c\u00e1c c\u00f4ng ngh\u1ec7 ti\u00ean ti\u1ebfn \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u b\u0103ng th\u00f4ng ng\u00e0y c\u00e0ng t\u0103ng t\u1eeb 5G, \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y v\u00e0 IoT. Gh\u00e9p k\u00eanh ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng (WDM) n\u1ed5i b\u1eadt l\u00e0 n\u1ec1n t\u1ea3ng, cho ph\u00e9p nhi\u1ec1u lu\u1ed3ng d\u1eef li\u1ec7u truy\u1ec1n \u0111\u1ed3ng th\u1eddi tr\u00ean m\u1ed9t s\u1ee3i quang. H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111i s\u00e2u v\u00e0o c\u00e1c nguy\u00ean t\u1eafc, lo\u1ea1i h\u00ecnh, \u1ee9ng d\u1ee5ng v\u00e0 xu h\u01b0\u1edbng t\u01b0\u01a1ng lai c\u1ee7a WDM. \u0110\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang cho c\u00e1c chuy\u00ean gia t\u00ecm ki\u1ebfm gi\u1ea3i ph\u00e1p t\u1eeb CommMesh, t\u00e0i li\u1ec7u n\u00e0y cung c\u1ea5p ki\u1ebfn th\u1ee9c to\u00e0n di\u1ec7n \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a m\u1ea1ng dung l\u01b0\u1ee3ng cao.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Gi\u1edbi thi\u1ec7u v\u1ec1 gh\u00e9p k\u00eanh ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng (WDM)<\/h2>\n\n\n\n<p>Gh\u00e9p k\u00eanh ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng (WDM) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt truy\u1ec1n d\u1eabn quang s\u1ee3i k\u1ebft h\u1ee3p nhi\u1ec1u t\u00edn hi\u1ec7u quang \u1edf c\u00e1c b\u01b0\u1edbc s\u00f3ng kh\u00e1c nhau th\u00e0nh m\u1ed9t s\u1ee3i quang duy nh\u1ea5t, gi\u00fap t\u0103ng \u0111\u00e1ng k\u1ec3 dung l\u01b0\u1ee3ng c\u1ee7a n\u00f3. M\u1ed7i b\u01b0\u1edbc s\u00f3ng, hay &quot;k\u00eanh&quot;, mang m\u1ed9t lu\u1ed3ng d\u1eef li\u1ec7u \u0111\u1ed9c l\u1eadp, cho ph\u00e9p b\u0103ng th\u00f4ng l\u00ean \u0111\u1ebfn 400 Gbps tr\u00ean m\u1ed7i k\u00eanh, v\u1edbi t\u1ed5ng dung l\u01b0\u1ee3ng \u0111\u1ea1t t\u1edbi terabit m\u1ed7i gi\u00e2y (Tbps) khi s\u1eed d\u1ee5ng nhi\u1ec1u k\u00eanh. Ra \u0111\u1eddi v\u00e0o nh\u1eefng n\u0103m 1980, WDM \u0111\u00e3 ph\u00e1t tri\u1ec3n t\u1eeb c\u00e1c h\u1ec7 th\u1ed1ng c\u01a1 b\u1ea3n th\u00e0nh c\u00e1c \u1ee9ng d\u1ee5ng tinh vi h\u1ed7 tr\u1ee3 vi\u1ec5n th\u00f4ng hi\u1ec7n \u0111\u1ea1i. T\u00ednh \u0111\u1ebfn n\u0103m 2025, v\u1edbi l\u01b0u l\u01b0\u1ee3ng d\u1eef li\u1ec7u t\u0103ng g\u1ea5p \u0111\u00f4i sau m\u1ed7i 18\u201324 th\u00e1ng (m\u1ed7i <a href=\"https:\/\/www.cisco.com\" target=\"_blank\" rel=\"noreferrer noopener\">Cisco<\/a>), WDM l\u00e0 c\u00f4ng ngh\u1ec7 kh\u00f4ng th\u1ec3 thi\u1ebfu \u0111\u1ed1i v\u1edbi m\u1ea1ng \u0111\u01b0\u1eddng d\u00e0i, m\u1ea1ng \u0111\u00f4 th\u1ecb v\u00e0 m\u1ea1ng truy c\u1eadp.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"888\" height=\"689\" src=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM.jpg\" alt=\"WDM\" class=\"wp-image-4219\" srcset=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM.jpg 888w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM-300x233.jpg 300w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM-768x596.jpg 768w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM-15x12.jpg 15w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/08\/WDM-600x466.jpg 600w\" sizes=\"(max-width: 888px) 100vw, 888px\" \/><\/a><figcaption class=\"wp-element-caption\">WDM<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Nguy\u00ean l\u00fd c\u1ee7a gh\u00e9p k\u00eanh ph\u00e2n chia b\u01b0\u1edbc s\u00f3ng<\/h2>\n\n\n\n<p>WDM ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch khai th\u00e1c b\u0103ng th\u00f4ng r\u1ed9ng l\u1edbn c\u1ee7a s\u1ee3i quang, c\u00f3 th\u1ec3 h\u1ed7 tr\u1ee3 h\u00e0ng ngh\u00ecn b\u01b0\u1edbc s\u00f3ng trong ph\u1ea1m vi 1260\u20131675 nm, b\u1ecb gi\u1edbi h\u1ea1n b\u1edfi \u0111\u1ed9 suy gi\u1ea3m c\u1ee7a s\u1ee3i quang (v\u00ed d\u1ee5: 0,2 dB\/km \u1edf 1550 nm). C\u00e1c nguy\u00ean t\u1eafc c\u1ed1t l\u00f5i bao g\u1ed3m:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Ph\u00e2n b\u1ed5 b\u01b0\u1edbc s\u00f3ng<\/strong>\n<ul class=\"wp-block-list\">\n<li>M\u1ed7i k\u00eanh s\u1eed d\u1ee5ng m\u1ed9t b\u01b0\u1edbc s\u00f3ng ri\u00eang bi\u1ec7t, c\u00e1ch nhau 0,8 nm (100 GHz) ho\u1eb7c 0,4 nm (50 GHz) trong b\u0103ng t\u1ea7n C (1530\u20131565 nm) ho\u1eb7c b\u0103ng t\u1ea7n L (1565\u20131625 nm), theo l\u01b0\u1edbi ITU-T G.694.1.<\/li>\n\n\n\n<li>V\u00ed d\u1ee5: 40 k\u00eanh v\u1edbi kho\u1ea3ng c\u00e1ch 100 GHz t\u1ea1o ra 16 Tbps v\u1edbi 400 Gbps cho m\u1ed7i k\u00eanh.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Gh\u00e9p k\u00eanh v\u00e0 t\u00e1ch k\u00eanh<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Gh\u00e9p k\u00eanh<\/strong>: B\u1ed9 gh\u00e9p k\u00eanh (MUX) k\u1ebft h\u1ee3p c\u00e1c b\u01b0\u1edbc s\u00f3ng b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng b\u1ed9 l\u1ecdc m\u00e0ng m\u1ecfng ho\u1eb7c l\u01b0\u1edbi d\u1eabn s\u00f3ng d\u1ea1ng m\u1ea3ng (AWG), \u0111\u1ea3m b\u1ea3o suy hao ch\u00e8n &lt;0,5 dB.<\/li>\n\n\n\n<li><strong>Ph\u00e2n t\u00e1ch k\u00eanh<\/strong>: B\u1ed9 t\u00e1ch k\u00eanh (DEMUX) t\u00e1ch c\u00e1c b\u01b0\u1edbc s\u00f3ng t\u1ea1i m\u00e1y thu, v\u1edbi nhi\u1ec5u xuy\u00ean \u00e2m d\u01b0\u1edbi -30 dB.<\/li>\n\n\n\n<li>L\u01b0u \u00fd k\u1ef9 thu\u1eadt: B\u1ed9 khu\u1ebfch \u0111\u1ea1i quang h\u1ecdc (v\u00ed d\u1ee5: EDFA) khu\u1ebfch \u0111\u1ea1i t\u00edn hi\u1ec7u sau m\u1ed7i 80\u2013100 km, b\u00f9 cho m\u1ee9c suy gi\u1ea3m 20\u201325 dB.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>S\u1ef1 truy\u1ec1n \u00e1nh s\u00e1ng<\/strong>\n<ul class=\"wp-block-list\">\n<li>T\u00edn hi\u1ec7u truy\u1ec1n \u0111i th\u00f4ng qua ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n b\u00ean trong l\u00f5i s\u1ee3i (chi\u1ebft su\u1ea5t ~1,46), v\u1edbi \u0111\u1ed9 ph\u00e2n t\u00e1n (v\u00ed d\u1ee5: 17 ps\/nm\/km) \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd b\u1edfi s\u1ee3i b\u00f9 t\u00e1n s\u1eafc (DCF).<\/li>\n\n\n\n<li>C\u00e1c hi\u1ec7u \u1ee9ng phi tuy\u1ebfn t\u00ednh nh\u01b0 tr\u1ed9n b\u1ed1n s\u00f3ng \u0111\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u b\u1eb1ng c\u00e1ch \u0111i\u1ec1u ch\u1ec9nh kho\u1ea3ng c\u00e1ch b\u01b0\u1edbc s\u00f3ng ch\u00ednh x\u00e1c.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c lo\u1ea1i gh\u00e9p k\u00eanh ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng<\/h2>\n\n\n\n<p>C\u00e1c bi\u1ebfn th\u1ec3 WDM \u0111\u00e1p \u1ee9ng c\u00e1c nhu c\u1ea7u v\u1ec1 dung l\u01b0\u1ee3ng v\u00e0 chi ph\u00ed kh\u00e1c nhau:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Gh\u00e9p k\u00eanh ph\u00e2n chia b\u01b0\u1edbc s\u00f3ng th\u00f4 (CWDM)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Nguy\u00ean t\u1eafc<\/strong>: S\u1eed d\u1ee5ng kho\u1ea3ng c\u00e1ch b\u01b0\u1edbc s\u00f3ng r\u1ed9ng h\u01a1n (20 nm, v\u00ed d\u1ee5: 1470\u20131610 nm), h\u1ed7 tr\u1ee3 18 k\u00eanh v\u1edbi t\u1ed1c \u0111\u1ed9 2,5\u201310 Gbps m\u1ed7i k\u00eanh.<\/li>\n\n\n\n<li><strong>Thu\u1eadn l\u1ee3i<\/strong>: Chi ph\u00ed th\u1ea5p h\u01a1n ($500\u2013$2000 cho m\u1ed7i MUX) v\u00e0 quang h\u1ecdc \u0111\u01a1n gi\u1ea3n h\u01a1n, v\u1edbi m\u1ee9c suy hao &lt;3 dB.<\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng<\/strong>: M\u1ea1ng l\u01b0\u1edbi t\u00e0u \u0111i\u1ec7n ng\u1ea7m c\u1ef1 ly ng\u1eafn (50\u201380 km) v\u00e0 c\u00e1c tuy\u1ebfn li\u00ean k\u1ebft tr\u01b0\u1eddng h\u1ecdc.<\/li>\n\n\n\n<li><strong>H\u1ea1n ch\u1ebf<\/strong>: Gi\u1edbi h\u1ea1n \u1edf 8\u201318 k\u00eanh do kho\u1ea3ng c\u00e1ch r\u1ed9ng h\u01a1n, theo ITU-T G.694.2.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Gh\u00e9p k\u00eanh ph\u00e2n chia b\u01b0\u1edbc s\u00f3ng d\u00e0y \u0111\u1eb7c (DWDM)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Nguy\u00ean t\u1eafc<\/strong>: S\u1eed d\u1ee5ng kho\u1ea3ng c\u00e1ch h\u1eb9p (0,8 nm ho\u1eb7c 100 GHz, v\u00ed d\u1ee5: 1530\u20131565 nm), h\u1ed7 tr\u1ee3 40\u201396 k\u00eanh v\u1edbi t\u1ed1c \u0111\u1ed9 10\u2013400 Gbps m\u1ed7i k\u00eanh.<\/li>\n\n\n\n<li><strong>Thu\u1eadn l\u1ee3i<\/strong>: Dung l\u01b0\u1ee3ng cao (l\u00ean \u0111\u1ebfn 96 Tbps), v\u1edbi m\u1ee9c suy hao &lt;0,5 dB tr\u00ean m\u1ed7i k\u00eanh, \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i b\u1eb1ng EDFA sau m\u1ed7i 80 km.<\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng<\/strong>: M\u1ea1ng \u0111\u01b0\u1eddng d\u00e0i (100\u20133000 km) v\u00e0 m\u1ea1ng x\u01b0\u01a1ng s\u1ed1ng.<\/li>\n\n\n\n<li><strong>H\u1ea1n ch\u1ebf<\/strong>: Chi ph\u00ed cao h\u01a1n ($5000\u2013$10.000 cho m\u1ed7i h\u1ec7 th\u1ed1ng) v\u00e0 ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 ph\u1ee9c t\u1ea1p (\u00b10,1\u00b0C).<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>WDM hai chi\u1ec1u (BWDM)<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Nguy\u00ean t\u1eafc<\/strong>: S\u1eed d\u1ee5ng c\u00f9ng m\u1ed9t s\u1ee3i quang cho l\u01b0u l\u01b0\u1ee3ng truy\u1ec1n l\u00ean v\u00e0 truy\u1ec1n xu\u1ed1ng \u1edf c\u00e1c b\u01b0\u1edbc s\u00f3ng kh\u00e1c nhau (v\u00ed d\u1ee5: 1310 nm v\u00e0 1550 nm).<\/li>\n\n\n\n<li><strong>Thu\u1eadn l\u1ee3i<\/strong>: T\u0103ng g\u1ea5p \u0111\u00f4i dung l\u01b0\u1ee3ng tr\u00ean c\u00e1c s\u1ee3i quang hi\u1ec7n c\u00f3, v\u1edbi m\u1ee9c suy hao &lt;1 dB.<\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng<\/strong>: FTTH (S\u1ee3i quang \u0111\u1ebfn t\u1eadn nh\u00e0) v\u00e0 m\u1ea1ng quy m\u00f4 nh\u1ecf.<\/li>\n\n\n\n<li><strong>H\u1ea1n ch\u1ebf<\/strong>: D\u1ec5 b\u1ecb nhi\u1ec5u xuy\u00ean \u00e2m 0,2 dB, c\u1ea7n c\u00f3 b\u1ed9 l\u1ecdc ch\u00ednh x\u00e1c.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c th\u00e0nh ph\u1ea7n k\u1ef9 thu\u1eadt c\u1ee7a h\u1ec7 th\u1ed1ng WDM<\/h2>\n\n\n\n<p>WDM d\u1ef1a v\u00e0o ph\u1ea7n c\u1ee9ng chuy\u00ean d\u1ee5ng:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>M\u00e1y ph\u00e1t v\u00e0 m\u00e1y thu<\/strong>\n<ul class=\"wp-block-list\">\n<li>Tia laser ph\u00e1t ra c\u00e1c b\u01b0\u1edbc s\u00f3ng c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: 1550,12 nm) v\u1edbi \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh \u00b10,1 nm, \u0111\u01b0\u1ee3c \u0111i\u1ec1u ch\u1ebf \u1edf t\u1ed1c \u0111\u1ed9 10\u2013400 Gbps b\u1eb1ng NRZ ho\u1eb7c QAM.<\/li>\n\n\n\n<li>M\u00e1y thu s\u1eed d\u1ee5ng \u0111i\u1ed1t quang \u0111\u1ec3 ph\u00e1t hi\u1ec7n t\u00edn hi\u1ec7u, v\u1edbi \u0111\u1ed9 nh\u1ea1y l\u00e0 -28 dBm.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>B\u1ed9 gh\u00e9p k\u00eanh quang h\u1ecdc (OADM)<\/strong>\n<ul class=\"wp-block-list\">\n<li>OADM th\u00eam ho\u1eb7c lo\u1ea1i b\u1ecf c\u00e1c b\u01b0\u1edbc s\u00f3ng ri\u00eang l\u1ebb (v\u00ed d\u1ee5: 1550,92 nm) v\u1edbi m\u1ee9c suy gi\u1ea3m &lt;0,3 dB, cho ph\u00e9p m\u1ea1ng l\u01b0\u1edbi linh ho\u1ea1t.<\/li>\n\n\n\n<li>\u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u1ea5u tr\u00fac v\u00f2ng cho th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng 99,9%.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>B\u1ed9 khu\u1ebfch \u0111\u1ea1i<\/strong>\n<ul class=\"wp-block-list\">\n<li>B\u1ed9 khu\u1ebfch \u0111\u1ea1i s\u1ee3i quang pha t\u1ea1p Erbium (EDFA) t\u0103ng c\u01b0\u1eddng 20\u201330 dB sau m\u1ed7i 80\u2013100 km, ho\u1ea1t \u0111\u1ed9ng \u1edf b\u0103ng t\u1ea7n C v\u1edbi h\u1ec7 s\u1ed1 nhi\u1ec5u 5\u20137 dB.<\/li>\n\n\n\n<li>B\u1ed9 khu\u1ebfch \u0111\u1ea1i Raman c\u00f3 th\u1ec3 m\u1edf r\u1ed9ng ph\u1ea1m vi l\u00ean t\u1edbi 150 km v\u1edbi \u0111\u1ed9 khu\u1ebfch \u0111\u1ea1i 15\u201320 dB.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>B\u00f9 tr\u1eeb ph\u00e2n t\u00e1n<\/strong>\n<ul class=\"wp-block-list\">\n<li>C\u00e1c m\u00f4-\u0111un DCF hi\u1ec7u ch\u1ec9nh \u0111\u1ed9 ph\u00e2n t\u00e1n 17 ps\/nm\/km, \u0111\u1ea3m b\u1ea3o t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u00edn hi\u1ec7u tr\u00ean ph\u1ea1m vi 1000 km.<\/li>\n\n\n\n<li>L\u01b0u \u00fd k\u1ef9 thu\u1eadt: Th\u00eam m\u1ee9c suy gi\u1ea3m 0,5\u20131 dB nh\u01b0ng ng\u0103n ng\u1eeba hi\u1ec7n t\u01b0\u1ee3ng m\u00e9o t\u00edn hi\u1ec7u 10%.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">\u1ee8ng d\u1ee5ng c\u1ee7a gh\u00e9p k\u00eanh ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng<\/h2>\n\n\n\n<p>T\u00ednh linh ho\u1ea1t c\u1ee7a WDM khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t ph\u1ea7n kh\u00f4ng th\u1ec3 thi\u1ebfu c\u1ee7a nhi\u1ec1u ki\u1ebfn tr\u00fac m\u1ea1ng kh\u00e1c nhau k\u1ec3 t\u1eeb n\u0103m 2025:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>M\u1ea1ng \u0111\u01b0\u1eddng d\u00e0i v\u00e0 m\u1ea1ng x\u01b0\u01a1ng s\u1ed1ng<\/strong>\n<ul class=\"wp-block-list\">\n<li>H\u1ec7 th\u1ed1ng DWDM h\u1ed7 tr\u1ee3 c\u00e1p xuy\u00ean \u0111\u1ea1i d\u01b0\u01a1ng, v\u1edbi 96 k\u00eanh cung c\u1ea5p 38,4 Tbps tr\u00ean 10.000 km, \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i sau m\u1ed7i 80 km. V\u00ed d\u1ee5: M\u1ea1ng c\u00e1p Ch\u00e2u \u00c1 - Th\u00e1i B\u00ecnh D\u01b0\u01a1ng 2025 (APCN-3) s\u1eed d\u1ee5ng DWDM \u0111\u1ec3 x\u1eed l\u00fd 50 Tbps, m\u1ed7i <a href=\"https:\/\/www.telegeography.com\" target=\"_blank\" rel=\"noreferrer noopener\">\u0110\u1ecba l\u00fd vi\u1ec5n th\u00e1m<\/a>.<\/li>\n\n\n\n<li>L\u01b0u \u00fd k\u1ef9 thu\u1eadt: EDFA duy tr\u00ec t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean nhi\u1ec5u (SNR) tr\u00ean 20 dB, \u0111\u1ea3m b\u1ea3o t\u1ef7 l\u1ec7 l\u1ed7i d\u01b0\u1edbi 10^-12.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>M\u1ea1ng l\u01b0\u1edbi Metro v\u00e0 Access<\/strong>\n<ul class=\"wp-block-list\">\n<li>CWDM l\u00fd t\u01b0\u1edfng cho c\u00e1c v\u00f2ng \u0111\u00f4 th\u1ecb d\u00e0i 50\u201380 km, v\u1edbi 8\u201318 k\u00eanh, m\u1ed7i k\u00eanh 10 Gbps, gi\u00fap gi\u1ea3m chi ph\u00ed 40% so v\u1edbi DWDM. V\u00ed d\u1ee5: C\u00e1c d\u1ef1 \u00e1n tri\u1ec3n khai m\u1ea1ng \u0111\u00f4 th\u1ecb c\u1ee7a Verizon t\u1ea1i c\u00e1c th\u00e0nh ph\u1ed1 Hoa K\u1ef3 s\u1eed d\u1ee5ng CWDM cho \u0111\u01b0\u1eddng truy\u1ec1n fronthaul 5G, h\u1ed7 tr\u1ee3 c\u00e1c li\u00ean k\u1ebft 100 Gbps.<\/li>\n\n\n\n<li>BWDM h\u1ed7 tr\u1ee3 FTTH, v\u1edbi b\u01b0\u1edbc s\u00f3ng hai chi\u1ec1u 1310\/1550 nm, cung c\u1ea5p 1 Gbps cho m\u1ed7i h\u1ed9 gia \u0111\u00ecnh.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Trung t\u00e2m d\u1eef li\u1ec7u<\/strong>\n<ul class=\"wp-block-list\">\n<li>DWDM k\u1ebft n\u1ed1i c\u00e1c rack d\u00e0i h\u01a1n 100 m\u00e9t, v\u1edbi 40 k\u00eanh t\u1ed1c \u0111\u1ed9 400 Gbps, t\u1ed5ng c\u1ed9ng 16 Tbps. C\u00e1c c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng si\u00eau quy m\u00f4 nh\u01b0 Amazon Web Services (AWS) d\u1ef1a v\u00e0o DWDM cho l\u01b0u l\u01b0\u1ee3ng \u0111\u00e1m m\u00e2y, x\u1eed l\u00fd h\u00e0ng petabyte m\u1ed7i ng\u00e0y.<\/li>\n\n\n\n<li>L\u01b0u \u00fd k\u1ef9 thu\u1eadt: OADM cho ph\u00e9p lo\u1ea1i b\u1ecf k\u00eanh \u0111\u1ed9ng, v\u1edbi th\u1eddi gian c\u1ea5u h\u00ecnh l\u1ea1i d\u01b0\u1edbi 50 ms.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>M\u1ea1ng doanh nghi\u1ec7p v\u00e0 tr\u01b0\u1eddng h\u1ecdc<\/strong>\n<ul class=\"wp-block-list\">\n<li>CWDM k\u1ebft n\u1ed1i c\u00e1c t\u00f2a nh\u00e0 v\u1edbi t\u1ed1c \u0111\u1ed9 10 Gbps m\u1ed7i k\u00eanh, v\u1edbi c\u00e1c thi\u1ebft b\u1ecb MUX\/DEMUX gi\u00e1 r\u1ebb. V\u00ed d\u1ee5: C\u00e1c tr\u01b0\u1eddng \u0111\u1ea1i h\u1ecdc \u1edf Ch\u00e2u \u00c2u s\u1eed d\u1ee5ng CWDM cho m\u1ea1ng l\u01b0\u1edbi to\u00e0n tr\u01b0\u1eddng, m\u1ed7i <a href=\"https:\/\/www.etsi.org\" target=\"_blank\" rel=\"noreferrer noopener\">ETSI<\/a> b\u00e1o c\u00e1o.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t c\u1ee7a h\u1ec7 th\u1ed1ng WDM<\/h2>\n\n\n\n<p>Hi\u1ec7u su\u1ea5t WDM \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 th\u00f4ng qua c\u00e1c th\u00f4ng s\u1ed1 ch\u00ednh:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Dung l\u01b0\u1ee3ng k\u00eanh v\u00e0 b\u0103ng th\u00f4ng<\/strong>\n<ul class=\"wp-block-list\">\n<li>DWDM cung c\u1ea5p 40\u201396 k\u00eanh (t\u1ed5ng c\u1ed9ng l\u00ean \u0111\u1ebfn 96 Tbps), v\u1edbi t\u1ed1c \u0111\u1ed9 tr\u00ean m\u1ed7i k\u00eanh l\u00e0 10\u2013400 Gbps khi s\u1eed d\u1ee5ng \u0111i\u1ec1u ch\u1ebf \u0111\u1ed3ng b\u1ed9 (v\u00ed d\u1ee5: QPSK ho\u1eb7c 16-QAM).<\/li>\n\n\n\n<li>CWDM gi\u1edbi h\u1ea1n \u1edf 18 k\u00eanh (l\u00ean \u0111\u1ebfn 180 Gbps), ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c thi\u1ebft l\u1eadp ti\u1ebft ki\u1ec7m chi ph\u00ed.<\/li>\n\n\n\n<li>Ghi ch\u00fa k\u1ef9 thu\u1eadt: Hi\u1ec7u su\u1ea5t ph\u1ed5 \u0111\u1ea1t 4\u20138 bit\/gi\u00e2y\/Hz trong DWDM, m\u1ed7i <a href=\"https:\/\/www.itu.int\/rec\/T-REC-G.694.1\" target=\"_blank\" rel=\"noreferrer noopener\">Ti\u00eau chu\u1ea9n ITU-T G.694.1<\/a>.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Suy gi\u1ea3m v\u00e0 ph\u1ea1m vi ti\u1ebfp c\u1eadn<\/strong>\n<ul class=\"wp-block-list\">\n<li>Suy hao s\u1ee3i quang (0,2 dB\/km \u1edf 1550 nm) \u0111\u01b0\u1ee3c b\u00f9 b\u1eb1ng EDFA (\u0111\u1ed9 l\u1ee3i 20\u201330 dB), m\u1edf r\u1ed9ng ph\u1ea1m vi t\u1edbi 1000 km m\u00e0 kh\u00f4ng c\u1ea7n t\u00e1i t\u1ea1o.<\/li>\n\n\n\n<li>\u0110\u1ed9 ph\u00e2n t\u00e1n (17 ps\/nm\/km) \u0111\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u b\u1eb1ng DCF, gi\u1eef t\u1ef7 l\u1ec7 l\u1ed7i bit (BER) d\u01b0\u1edbi 10^-9.<\/li>\n\n\n\n<li>S\u1ef1 kh\u00e1c bi\u1ec7t: Ph\u1ea1m vi ph\u1ee7 s\u00f3ng c\u1ee7a CWDM l\u00e0 80 km khi kh\u00f4ng c\u00f3 b\u1ed9 khu\u1ebfch \u0111\u1ea1i, so v\u1edbi 3000 km c\u1ee7a DWDM khi c\u00f3 b\u1ed9 khu\u1ebfch \u0111\u1ea1i Raman.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Nhi\u1ec5u xuy\u00ean \u00e2m v\u00e0 ti\u1ebfng \u1ed3n<\/strong>\n<ul class=\"wp-block-list\">\n<li>Nhi\u1ec5u xuy\u00ean k\u00eanh \u0111\u01b0\u1ee3c gi\u1eef \u1edf m\u1ee9c d\u01b0\u1edbi -30 dB v\u1edbi b\u1ed9 l\u1ecdc AWG, trong khi s\u1ed1 li\u1ec7u nhi\u1ec5u EDFA (4\u20136 dB) gi\u1edbi h\u1ea1n SNR \u1edf m\u1ee9c 20\u201325 dB.<\/li>\n\n\n\n<li>C\u00e1c hi\u1ec7u \u1ee9ng phi tuy\u1ebfn t\u00ednh nh\u01b0 \u0111i\u1ec1u ch\u1ebf t\u1ef1 pha (SPM) \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd v\u1edbi m\u1ee9c c\u00f4ng su\u1ea5t &lt;5 dBm tr\u00ean m\u1ed7i k\u00eanh.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u0110\u1ed9 tin c\u1eady v\u00e0 \u0111\u1ed9 tr\u1ec5<\/strong>\n<ul class=\"wp-block-list\">\n<li>H\u1ec7 th\u1ed1ng WDM \u0111\u1ea1t th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng 99,999% v\u1edbi b\u1ed9 khu\u1ebfch \u0111\u1ea1i d\u1ef1 ph\u00f2ng, t\u0103ng th\u00eam \u0111\u1ed9 tr\u1ec5 &lt;0,1 ms cho m\u1ed7i MUX\/DEMUX.<\/li>\n\n\n\n<li>L\u01b0u \u00fd k\u1ef9 thu\u1eadt: OSNR (t\u1ef7 l\u1ec7 t\u00edn hi\u1ec7u tr\u00ean nhi\u1ec5u quang) ph\u1ea3i v\u01b0\u1ee3t qu\u00e1 20 dB \u0111\u1ec3 truy\u1ec1n 400 Gbps.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>H\u1ec7 m\u00e9t<\/strong><\/th><th><strong>CWDM<\/strong><\/th><th><strong>DWDM<\/strong><\/th><th><strong>BWDM<\/strong><\/th><\/tr><\/thead><tbody><tr><td>K\u00eanh<\/td><td>8\u201318<\/td><td>40\u201396<\/td><td>2\u20134<\/td><\/tr><tr><td>B\u0103ng th\u00f4ng (Gbps\/k\u00eanh)<\/td><td>2,5\u201310<\/td><td>10\u2013400<\/td><td>1\u201310<\/td><\/tr><tr><td>T\u1ea7m v\u1edbi (km)<\/td><td>50\u201380<\/td><td>100\u20133000<\/td><td>20\u201350<\/td><\/tr><tr><td>Suy hao ch\u00e8n (dB)<\/td><td>&lt;3<\/td><td>&lt;0,5<\/td><td>&lt;1<\/td><\/tr><tr><td>Chi ph\u00ed ($ cho m\u1ed7i MUX)<\/td><td>500\u20132000<\/td><td>5000\u201310000<\/td><td>100\u2013500<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Nh\u1eefng th\u00e1ch th\u1ee9c trong vi\u1ec7c tri\u1ec3n khai WDM<\/h2>\n\n\n\n<p>Vi\u1ec7c tri\u1ec3n khai WDM g\u1eb7p ph\u1ea3i m\u1ed9t s\u1ed1 tr\u1edf ng\u1ea1i k\u1ef9 thu\u1eadt:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Chi ph\u00ed v\u00e0 \u0111\u1ed9 ph\u1ee9c t\u1ea1p<\/strong>\n<ul class=\"wp-block-list\">\n<li>H\u1ec7 th\u1ed1ng DWDM c\u00f3 gi\u00e1 t\u1eeb $50.000\u2013$100.000 m\u1ed7i n\u00fat nh\u1edd laser v\u00e0 b\u1ed9 khu\u1ebfch \u0111\u1ea1i ch\u00ednh x\u00e1c. Gi\u1ea3i ph\u00e1p: CWDM d\u00e0nh cho m\u1ea1ng l\u01b0\u1edbi ti\u1ebft ki\u1ec7m chi ph\u00ed, gi\u1ea3m chi ph\u00ed 50%.<\/li>\n\n\n\n<li>\u0110\u1ed9 ph\u1ee9c t\u1ea1p trong vi\u1ec7c ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 (\u00b10,1\u00b0C) \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh c\u1ee7a b\u01b0\u1edbc s\u00f3ng l\u00e0m t\u0103ng th\u00eam chi ph\u00ed v\u1eadn h\u00e0nh.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>S\u1ef1 ph\u00e2n t\u00e1n v\u00e0 hi\u1ec7u \u1ee9ng phi tuy\u1ebfn t\u00ednh<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u0110\u1ed9 t\u00e1n s\u1eafc (17 ps\/nm\/km) l\u00e0m suy gi\u1ea3m t\u00edn hi\u1ec7u tr\u00ean 100 km, g\u00e2y ra s\u1ef1 gia t\u0103ng BER 10%. Gi\u1ea3i ph\u00e1p: Chip DCF ho\u1eb7c chip x\u1eed l\u00fd t\u00edn hi\u1ec7u s\u1ed1 (DSP) s\u1ebd hi\u1ec7u ch\u1ec9nh 90% hi\u1ec7u \u1ee9ng.<\/li>\n\n\n\n<li>Tr\u1ed9n b\u1ed1n s\u00f3ng (FWM) \u1edf c\u00f4ng su\u1ea5t cao (&gt;5 dBm) s\u1ebd t\u1ea1o ra nhi\u1ec5u xuy\u00ean \u00e2m. Gi\u1ea3i ph\u00e1p: Kho\u1ea3ng c\u00e1ch k\u00eanh kh\u00f4ng \u0111\u1ec1u ho\u1eb7c gh\u00e9p k\u00eanh ph\u00e2n c\u1ef1c.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Gi\u1edbi h\u1ea1n khu\u1ebfch \u0111\u1ea1i<\/strong>\n<ul class=\"wp-block-list\">\n<li>EDFA ch\u1ec9 khu\u1ebfch \u0111\u1ea1i b\u0103ng t\u1ea7n C (1530\u20131565 nm), gi\u1edbi h\u1ea1n k\u00eanh. Gi\u1ea3i ph\u00e1p: B\u1ed9 khu\u1ebfch \u0111\u1ea1i Raman m\u1edf r\u1ed9ng \u0111\u1ebfn b\u0103ng t\u1ea7n L (1565\u20131625 nm), th\u00eam 40 k\u00eanh.<\/li>\n\n\n\n<li>S\u1ef1 t\u00edch t\u1ee5 nhi\u1ec5u l\u00e0m gi\u1ea3m OSNR 5 dB tr\u00ean m\u1ed7i t\u1ea7ng khu\u1ebfch \u0111\u1ea1i. Gi\u1ea3i ph\u00e1p: Hi\u1ec7u ch\u1ec9nh l\u1ed7i thu\u1eadn (FEC) c\u1ea3i thi\u1ec7n BER th\u00eam 10^-6.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>C\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng<\/strong>\n<ul class=\"wp-block-list\">\n<li>Vi\u1ec7c th\u00eam k\u00eanh gi\u1eefa m\u1ea1ng y\u00eau c\u1ea7u OADM, v\u1edbi m\u1ee9c suy hao 0,3 dB m\u1ed7i k\u00eanh. Gi\u1ea3i ph\u00e1p: OADM c\u00f3 th\u1ec3 c\u1ea5u h\u00ecnh l\u1ea1i (ROADM) cho ph\u00e9p th\u00eam k\u00eanh \u0111\u1ed9ng trong v\u00f2ng ch\u01b0a \u0111\u1ea7y 1 ph\u00fat.<\/li>\n\n\n\n<li>S\u1ef1 c\u1ea1n ki\u1ec7t ph\u1ed5 t\u1ea7n trong c\u00e1c s\u1ee3i quang \u0111\u00f4 th\u1ecb d\u00e0y \u0111\u1eb7c. Gi\u1ea3i ph\u00e1p: C\u00f4ng ngh\u1ec7 WDM l\u01b0\u1edbi linh ho\u1ea1t (flexi-WDM) v\u1edbi kho\u1ea3ng c\u00e1ch 12,5 GHz gi\u00fap t\u0103ng g\u1ea5p \u0111\u00f4i dung l\u01b0\u1ee3ng.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Xu h\u01b0\u1edbng t\u01b0\u01a1ng lai trong gh\u00e9p k\u00eanh ph\u00e2n chia b\u01b0\u1edbc s\u00f3ng<\/h2>\n\n\n\n<p>WDM \u0111ang ph\u00e1t tri\u1ec3n \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u b\u00f9ng n\u1ed5 d\u1eef li\u1ec7u v\u00e0o n\u0103m 2025:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>WDM si\u00eau m\u1eadt \u0111\u1ed9 (SD-WDM)<\/strong>\n<ul class=\"wp-block-list\">\n<li>H\u1ed7 tr\u1ee3 h\u01a1n 200 k\u00eanh v\u1edbi kho\u1ea3ng c\u00e1ch 25 GHz, \u0111\u1ea1t t\u1ed1c \u0111\u1ed9 80 Tbps tr\u00ean m\u1ed7i s\u1ee3i quang. C\u00e1c nguy\u00ean m\u1eabu t\u1eeb Huawei d\u1ef1 ki\u1ebfn tri\u1ec3n khai v\u00e0o n\u0103m 2026.<\/li>\n\n\n\n<li>Ghi ch\u00fa k\u1ef9 thu\u1eadt: S\u1eed d\u1ee5ng DSP ti\u00ean ti\u1ebfn \u0111\u1ec3 \u0111\u1ea1t hi\u1ec7u su\u1ea5t 8 bit\/gi\u00e2y\/Hz.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>WDM m\u1ea1ch l\u1ea1c<\/strong>\n<ul class=\"wp-block-list\">\n<li>S\u1eed d\u1ee5ng \u0111i\u1ec1u ch\u1ebf pha (v\u00ed d\u1ee5: DP-QPSK) cho t\u1ed1c \u0111\u1ed9 800 Gbps tr\u00ean m\u1ed7i k\u00eanh tr\u00ean 1000 km, v\u1edbi OSNR &gt;25 dB. \u0110\u01b0\u1ee3c \u00e1p d\u1ee5ng trong 40% c\u1ee7a c\u00e1c tuy\u1ebfn \u0111\u01b0\u1eddng d\u00e0i m\u1edbi (theo TeleGeography).<\/li>\n\n\n\n<li>Gi\u1ea3i ph\u00e1p cho c\u00e1c hi\u1ec7u \u1ee9ng phi tuy\u1ebfn t\u00ednh: C\u00e2n b\u1eb1ng th\u00edch \u1ee9ng l\u00e0m gi\u1ea3m \u0111\u1ed9 m\u00e9o ti\u1ebfng xu\u1ed1ng 20%.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Photonic t\u00edch h\u1ee3p<\/strong>\n<ul class=\"wp-block-list\">\n<li>Chip MUX\/DEMUX c\u1ee7a Silicon Photonics gi\u1ea3m k\u00edch th\u01b0\u1edbc 50% v\u00e0 chi ph\u00ed 30%, cho ph\u00e9p t\u1ea1o ra c\u00e1c h\u1ec7 th\u1ed1ng nh\u1ecf g\u1ecdn cho trung t\u00e2m d\u1eef li\u1ec7u.<\/li>\n\n\n\n<li>V\u00ed d\u1ee5: Chip 2025 c\u1ee7a Intel h\u1ed7 tr\u1ee3 100 k\u00eanh v\u1edbi m\u1ee9c suy hao 0,2 dB.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>WDM \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a b\u1eb1ng AI<\/strong>\n<ul class=\"wp-block-list\">\n<li>Thu\u1eadt to\u00e1n AI d\u1ef1 \u0111o\u00e1n ph\u00e2n b\u1ed5 k\u00eanh, c\u1ea3i thi\u1ec7n vi\u1ec7c s\u1eed d\u1ee5ng ph\u1ed5 t\u1ea7n th\u00eam 25% v\u00e0 gi\u1ea3m m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng th\u00eam 15%. C\u00e1c th\u1eed nghi\u1ec7m c\u1ee7a Nokia cho th\u1ea5y th\u1eddi gian ho\u1ea1t \u0111\u1ed9ng l\u00e0 99.99%.<\/li>\n\n\n\n<li>L\u01b0u \u00fd k\u1ef9 thu\u1eadt: C\u00e1c m\u00f4 h\u00ecnh h\u1ecdc m\u00e1y ph\u00e2n t\u00edch OSNR theo th\u1eddi gian th\u1ef1c \u0111\u1ec3 c\u1ea5u h\u00ecnh l\u1ea1i \u0111\u1ed9ng.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">Ph\u1ea7n k\u1ebft lu\u1eadn<\/h2>\n\n\n\n<p>Gh\u00e9p k\u00eanh ph\u00e2n chia b\u01b0\u1edbc s\u00f3ng (WDM) \u0111ang c\u00e1ch m\u1ea1ng h\u00f3a ng\u00e0nh c\u00e1p quang b\u1eb1ng c\u00e1ch gh\u00e9p k\u00eanh nhi\u1ec1u b\u01b0\u1edbc s\u00f3ng (v\u00ed d\u1ee5: 1310\u20131550 nm) tr\u00ean m\u1ed9t s\u1ee3i quang duy nh\u1ea5t, \u0111\u1ea1t \u0111\u01b0\u1ee3c dung l\u01b0\u1ee3ng Tbps v\u1edbi m\u1ee9c suy hao th\u1ea5p (0,2 dB\/km). T\u1eeb CWDM cho m\u1ea1ng l\u01b0\u1edbi \u0111\u00f4 th\u1ecb ti\u1ebft ki\u1ec7m chi ph\u00ed \u0111\u1ebfn DWDM cho m\u1ea1ng x\u01b0\u01a1ng s\u1ed1ng m\u1eadt \u0111\u1ed9 cao, c\u00e1c nguy\u00ean l\u00fd gh\u00e9p k\u00eanh, khu\u1ebfch \u0111\u1ea1i v\u00e0 b\u00f9 t\u00e1n s\u1eafc c\u1ee7a WDM th\u00fac \u0111\u1ea9y vi\u1ec5n th\u00f4ng hi\u1ec7n \u0111\u1ea1i. B\u1ea5t ch\u1ea5p nh\u1eefng th\u00e1ch th\u1ee9c v\u1ec1 chi ph\u00ed v\u00e0 hi\u1ec7u \u1ee9ng phi tuy\u1ebfn t\u00ednh, c\u00e1c gi\u1ea3i ph\u00e1p nh\u01b0 ROADM v\u00e0 DSP \u0111\u1ea3m b\u1ea3o kh\u1ea3 n\u0103ng m\u1edf r\u1ed9ng. C\u00e1c xu h\u01b0\u1edbng trong t\u01b0\u01a1ng lai, bao g\u1ed3m t\u00edch h\u1ee3p SD-WDM v\u00e0 AI, h\u1ee9a h\u1eb9n hi\u1ec7u qu\u1ea3 th\u1eadm ch\u00ed c\u00f2n cao h\u01a1n n\u1eefa. \u0110\u1ec3 t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c gi\u1ea3i ph\u00e1p WDM, h\u00e3y kh\u00e1m ph\u00e1 <a href=\"https:\/\/commmesh.com\/vi\/\" target=\"_blank\" rel=\"noreferrer noopener\">M\u1ea1ng l\u01b0\u1edbi giao ti\u1ebfp<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>M\u1ea1ng l\u01b0\u1edbi c\u00e1p quang to\u00e0n c\u1ea7u, v\u1edbi t\u1ed5ng chi\u1ec1u d\u00e0i h\u01a1n 1,8 tri\u1ec7u km t\u00ednh \u0111\u1ebfn n\u0103m 2025, d\u1ef1a v\u00e0o c\u00e1c c\u00f4ng ngh\u1ec7 ti\u00ean ti\u1ebfn \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u b\u0103ng th\u00f4ng ng\u00e0y c\u00e0ng t\u0103ng t\u1eeb 5G, \u0111i\u1ec7n to\u00e1n \u0111\u00e1m m\u00e2y v\u00e0 IoT. Gh\u00e9p k\u00eanh ph\u00e2n chia theo b\u01b0\u1edbc s\u00f3ng (WDM) n\u1ed5i b\u1eadt l\u00e0 n\u1ec1n t\u1ea3ng, cho ph\u00e9p nhi\u1ec1u lu\u1ed3ng d\u1eef li\u1ec7u truy\u1ec1n \u0111\u1ed3ng th\u1eddi tr\u00ean m\u1ed9t s\u1ee3i quang. H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111i s\u00e2u v\u00e0o c\u00e1c nguy\u00ean t\u1eafc, lo\u1ea1i h\u00ecnh, \u1ee9ng d\u1ee5ng, [\u2026]<\/p>","protected":false},"author":1,"featured_media":4219,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"What is Wavelength Division Multiplexing (WDM): A Technical Guide","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[34],"tags":[],"class_list":["post-4215","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"_links":{"self":[{"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/4215","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/comments?post=4215"}],"version-history":[{"count":6,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/4215\/revisions"}],"predecessor-version":[{"id":4264,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/4215\/revisions\/4264"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/media\/4219"}],"wp:attachment":[{"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/media?parent=4215"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/categories?post=4215"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/tags?post=4215"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}