{"id":3553,"date":"2025-04-22T09:31:45","date_gmt":"2025-04-22T09:31:45","guid":{"rendered":"https:\/\/commmesh.com\/?p=3553"},"modified":"2025-04-22T09:57:48","modified_gmt":"2025-04-22T09:57:48","slug":"dispersion-in-optical-fiber","status":"publish","type":"post","link":"https:\/\/commmesh.com\/vi\/dispersion-in-optical-fiber\/","title":{"rendered":"S\u1ef1 t\u00e1n s\u1eafc trong s\u1ee3i quang l\u00e0 g\u00ec? \u0110\u1ecbnh ngh\u0129a, c\u00e1c lo\u1ea1i v\u00e0 nhi\u1ec1u h\u01a1n n\u1eefa"},"content":{"rendered":"

H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng vi\u1ec7c g\u1eedi m\u1ed9t tin nh\u1eafn th\u00f4ng qua m\u1ed9t c\u00e1p quang<\/em>\u2014m\u1ed9t s\u1ee3i th\u1ee7y tinh nh\u1ecf truy\u1ec1n t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng v\u1edbi t\u1ed1c \u0111\u1ed9 \u0111\u00e1ng kinh ng\u1ea1c. B\u00e2y gi\u1edd, h\u00e3y h\u00ecnh dung th\u00f4ng \u0111i\u1ec7p \u0111\u00f3 \u0111\u1ebfn m\u1ed9t c\u00e1ch l\u1ed9n x\u1ed9n v\u00ec c\u00e1c t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng lan ra d\u1ecdc \u0111\u01b0\u1eddng. S\u1ef1 lan truy\u1ec1n n\u00e0y, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>, l\u00e0 m\u1ed9t th\u00e1ch th\u1ee9c quan tr\u1ecdng trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>. S\u1ef1 ph\u00e2n t\u00e1n c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm internet c\u1ee7a b\u1ea1n, l\u00e0m m\u00e9o ti\u1ebfng c\u00e1c cu\u1ed9c g\u1ecdi video ho\u1eb7c th\u1eadm ch\u00ed l\u00e0m gi\u00e1n \u0111o\u1ea1n vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u quan tr\u1ecdng trong c\u00e1c m\u1ea1ng l\u1edbn. Trong h\u01b0\u1edbng d\u1eabn d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u n\u00e0y, ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 nh\u1eefng g\u00ec s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> l\u00e0, n\u00f3 \u1ea3nh h\u01b0\u1edfng nh\u01b0 th\u1ebf n\u00e0o c\u00e1p quang<\/a><\/em>, c\u00e1c lo\u1ea1i kh\u00e1c nhau c\u1ee7a n\u00f3, v\u00e0 l\u00e0m th\u1ebf n\u00e0o c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 n\u00e0y \u0111\u1ec3 gi\u1eef cho k\u1ebft n\u1ed1i c\u1ee7a b\u1ea1n nhanh ch\u00f3ng v\u00e0 r\u00f5 r\u00e0ng. Cho d\u00f9 b\u1ea1n t\u00f2 m\u00f2 v\u1ec1 c\u00e1ch s\u1ee3i quang<\/em> l\u00e0m vi\u1ec7c ho\u1eb7c thi\u1ebft l\u1eadp m\u1ea1ng l\u01b0\u1edbi, hi\u1ec3u bi\u1ebft s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft. H\u00e3y c\u00f9ng kh\u00e1m ph\u00e1 th\u1ebf gi\u1edbi c\u1ee7a c\u00e1p quang<\/em> v\u00e0 kh\u00e1m ph\u00e1 kh\u00e1i ni\u1ec7m h\u1ea5p d\u1eabn n\u00e0y!<\/p>\n\n\n\n\n\n

S\u1ef1 t\u00e1n s\u1eafc trong s\u1ee3i quang l\u00e0 g\u00ec?<\/h2>\n\n\n\n

\u0110\u1ecbnh ngh\u0129a s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/h3>\n\n\n\n

S\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> \u0111\u1ec1 c\u1eadp \u0111\u1ebfn s\u1ef1 lan truy\u1ec1n c\u1ee7a c\u00e1c t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng khi ch\u00fang truy\u1ec1n qua m\u1ed9t s\u1ee3i quang<\/em>. TRONG c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng mang d\u1eef li\u1ec7u d\u01b0\u1edbi d\u1ea1ng xung\u2014h\u00e3y ngh\u0129 v\u1ec1 ch\u00fang nh\u01b0 nh\u1eefng tia s\u00e1ng nh\u1ecf bi\u1ec3u di\u1ec5n 1 v\u00e0 0. Khi nh\u1eefng xung n\u00e0y lan ra, ch\u00fang b\u1eaft \u0111\u1ea7u ch\u1ed3ng l\u00ean nhau, khi\u1ebfn \u0111\u1ea7u thu kh\u00f3 ph\u00e2n bi\u1ec7t gi\u1eefa ch\u00fang h\u01a1n. S\u1ef1 lan truy\u1ec1n n\u00e0y x\u1ea3y ra v\u00ec c\u00e1c ph\u1ea7n kh\u00e1c nhau c\u1ee7a t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 h\u01a1i kh\u00e1c nhau ho\u1eb7c \u0111i theo c\u00e1c \u0111\u01b0\u1eddng kh\u00e1c nhau qua c\u00e1p quang<\/em>. TRONG s\u1ee3i quang<\/em>, s\u1ef1 ph\u00e2n t\u00e1n l\u00e0 m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng t\u1ef1 nhi\u00ean c\u00f3 th\u1ec3 h\u1ea1n ch\u1ebf l\u01b0\u1ee3ng d\u1eef li\u1ec7u m\u00e0 c\u00e1p c\u00f3 th\u1ec3 truy\u1ec1n t\u1ea3i v\u00e0 kho\u1ea3ng c\u00e1ch truy\u1ec1n t\u00edn hi\u1ec7u r\u00f5 r\u00e0ng.<\/p>\n\n\n\n

\"s\u1ef1<\/a>
s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/figcaption><\/figure>\n\n\n\n

S\u1ef1 ph\u00e2n t\u00e1n x\u1ea3y ra nh\u01b0 th\u1ebf n\u00e0o trong c\u00e1p quang<\/h3>\n\n\n\n

B\u00ean trong m\u1ed9t c\u00e1p quang<\/em>, \u00e1nh s\u00e1ng \u0111i qua l\u00f5i l\u00e0m b\u1eb1ng th\u1ee7y tinh ho\u1eb7c nh\u1ef1a, \u0111\u01b0\u1ee3c bao quanh b\u1edfi l\u1edbp v\u1ecf b\u1ecdc gi\u1eef cho \u00e1nh s\u00e1ng b\u1ecb gi\u1edbi h\u1ea1n. Trong m\u1ed9t th\u1ebf gi\u1edbi l\u00fd t\u01b0\u1edfng, t\u1ea5t c\u1ea3 c\u00e1c t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng s\u1ebd di chuy\u1ec3n v\u1edbi c\u00f9ng m\u1ed9t t\u1ed1c \u0111\u1ed9 v\u00e0 \u0111\u1ebfn cu\u1ed1i s\u1ee3i quang<\/em> c\u00f9ng nhau. Tuy nhi\u00ean, tr\u00ean th\u1ef1c t\u1ebf, c\u00e1c y\u1ebfu t\u1ed1 nh\u01b0 c\u1ea5u tr\u00fac s\u1ee3i, b\u01b0\u1edbc s\u00f3ng \u00e1nh s\u00e1ng v\u00e0 t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u c\u1ee7a l\u00f5i<\/a> g\u00e2y ra c\u00e1c bi\u1ebfn th\u1ec3. M\u1ed9t s\u1ed1 tia s\u00e1ng c\u00f3 th\u1ec3 \u0111i theo \u0111\u01b0\u1eddng d\u00e0i h\u01a1n ho\u1eb7c m\u1ed9t s\u1ed1 b\u01b0\u1edbc s\u00f3ng c\u00f3 th\u1ec3 di chuy\u1ec3n nhanh h\u01a1n nh\u1eefng b\u01b0\u1edbc s\u00f3ng kh\u00e1c, d\u1eabn \u0111\u1ebfn s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>. TRONG c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, s\u1ef1 ph\u00e2n t\u00e1n n\u00e0y l\u00e0m cho c\u00e1c xung \u00e1nh s\u00e1ng b\u1ecb m\u1edd, l\u00e0m gi\u1ea3m \u0111\u1ed9 r\u00f5 n\u00e9t c\u1ee7a d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy\u1ec1n qua c\u00e1p quang<\/em>.<\/p>\n\n\n\n

T\u1ea1i sao \u0111\u00e2y l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/h3>\n\n\n\n

S\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> b\u1edfi v\u00ec n\u00f3 \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1p quang<\/em>. N\u1ebfu \u0111\u1ed9 ph\u00e2n t\u00e1n qu\u00e1 cao, t\u00edn hi\u1ec7u d\u1eef li\u1ec7u s\u1ebd b\u1ecb m\u00e9o, d\u1eabn \u0111\u1ebfn l\u1ed7i, t\u1ed1c \u0111\u1ed9 ch\u1eadm h\u01a1n ho\u1eb7c th\u1eadm ch\u00ed m\u1ea5t t\u00edn hi\u1ec7u ho\u00e0n to\u00e0n. V\u00ed d\u1ee5, trong k\u1ebft n\u1ed1i internet t\u1ed1c \u0111\u1ed9 cao, \u0111\u1ed9 ph\u00e2n t\u00e1n qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng \u0111\u1ec7m trong khi truy\u1ec1n ph\u00e1t ho\u1eb7c l\u00e0m m\u1ea5t c\u00e1c g\u00f3i tin trong cu\u1ed9c g\u1ecdi video. Trong s\u1ee3i quang<\/em> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u1ea1ng vi\u1ec5n th\u00f4ng \u0111\u01b0\u1eddng d\u00e0i, s\u1ef1 ph\u00e2n t\u00e1n c\u00f3 th\u1ec3 h\u1ea1n ch\u1ebf kho\u1ea3ng c\u00e1ch t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 truy\u1ec1n \u0111i tr\u01b0\u1edbc khi c\u1ea7n \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i ho\u1eb7c t\u00e1i t\u1ea1o. Hi\u1ec3u bi\u1ebft s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> gi\u00fap c\u00e1c k\u1ef9 s\u01b0 thi\u1ebft k\u1ebf t\u1ed1t h\u01a1n c\u00e1p quang<\/em> v\u00e0 m\u1ea1ng l\u01b0\u1edbi \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o li\u00ean l\u1ea1c nhanh ch\u00f3ng v\u00e0 \u0111\u00e1ng tin c\u1eady.<\/p>\n\n\n\n

C\u00e1c lo\u1ea1i ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/h2>\n\n\n\n

Ph\u00e2n t\u00e1n Modal trong s\u1ee3i quang<\/h3>\n\n\n\n

Ph\u00e2n t\u00e1n m\u00f4 th\u1ee9c<\/strong> x\u1ea3y ra \u1edf s\u1ee3i quang<\/em> khi t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng \u0111i theo c\u00e1c \u0111\u01b0\u1eddng d\u1eabn kh\u00e1c nhau, ho\u1eb7c "ch\u1ebf \u0111\u1ed9", th\u00f4ng qua c\u1ed1t l\u00f5i c\u1ee7a m\u1ed9t c\u00e1p quang<\/em><\/a>. Lo\u1ea1i n\u00e0y s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> l\u00e0 ph\u1ed5 bi\u1ebfn nh\u1ea5t \u1edf s\u1ee3i \u0111a mode<\/a>, c\u00f3 l\u00f5i l\u1edbn h\u01a1n cho ph\u00e9p nhi\u1ec1u \u0111\u01b0\u1eddng \u0111i c\u1ee7a \u00e1nh s\u00e1ng. M\u1ed9t s\u1ed1 tia s\u00e1ng \u0111i th\u1eb3ng xu\u1ed1ng t\u00e2m l\u00f5i, trong khi nh\u1eefng tia kh\u00e1c ph\u1ea3n x\u1ea1 kh\u1ecfi ranh gi\u1edbi l\u00f5i-l\u1edbp ph\u1ee7 \u1edf nhi\u1ec1u g\u00f3c \u0111\u1ed9 kh\u00e1c nhau, \u0111i theo \u0111\u01b0\u1eddng ngo\u1eb1n ngo\u00e8o d\u00e0i h\u01a1n. V\u00ec nh\u1eefng tia n\u00e0y \u0111i qua nh\u1eefng kho\u1ea3ng c\u00e1ch kh\u00e1c nhau n\u00ean ch\u00fang \u0111\u1ebfn cu\u1ed1i s\u1ee3i quang<\/em> v\u00e0o nh\u1eefng th\u1eddi \u0111i\u1ec3m kh\u00e1c nhau, khi\u1ebfn cho c\u00e1c xung \u00e1nh s\u00e1ng lan r\u1ed9ng ra. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, s\u1ef1 ph\u00e2n t\u00e1n theo ph\u01b0\u01a1ng th\u1ee9c gi\u1edbi h\u1ea1n b\u0103ng th\u00f4ng\u2014l\u01b0\u1ee3ng d\u1eef li\u1ec7u m\u00e0 s\u1ee3i quang c\u00f3 th\u1ec3 mang\u2014v\u00e0 kho\u1ea3ng c\u00e1ch m\u00e0 \u0111a ch\u1ebf \u0111\u1ed9 c\u00e1p quang<\/em> c\u00f3 th\u1ec3 truy\u1ec1n t\u00edn hi\u1ec7u r\u00f5 r\u00e0ng.<\/p>\n\n\n\n

S\u1ef1 ph\u00e2n t\u00e1n m\u00e0u trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/h3>\n\n\n\n

S\u1ef1 t\u00e1n s\u1eafc x\u1ea3y ra do c\u00e1c b\u01b0\u1edbc s\u00f3ng \u00e1nh s\u00e1ng kh\u00e1c nhau di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 kh\u00e1c nhau qua s\u1ee3i quang<\/em>. TRONG c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, c\u00e1c ngu\u1ed3n s\u00e1ng nh\u01b0 tia laser kh\u00f4ng ho\u00e0n to\u00e0n \u0111\u01a1n s\u1eafc\u2014ch\u00fang ph\u00e1t ra m\u1ed9t lo\u1ea1t c\u00e1c b\u01b0\u1edbc s\u00f3ng, ngay c\u1ea3 khi \u0111\u00f3 l\u00e0 m\u1ed9t ph\u1ea1m vi h\u1eb9p. M\u1ed7i b\u01b0\u1edbc s\u00f3ng di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 h\u01a1i kh\u00e1c nhau do c\u00e1c \u0111\u1eb7c t\u00ednh v\u1eadt li\u1ec7u c\u1ee7a c\u00e1p quang<\/em>l\u00f5i c\u1ee7a ', m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ef1 ph\u00e2n t\u00e1n v\u1eadt ch\u1ea5t<\/strong>. Ngo\u00e0i ra, c\u1ea5u tr\u00fac c\u1ee7a s\u1ee3i quang<\/em> c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 ph\u00e2n t\u00e1n c\u1ee7a \u1ed1ng d\u1eabn s\u00f3ng, trong \u0111\u00f3 thi\u1ebft k\u1ebf c\u1ee7a s\u1ee3i \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1ch \u00e1nh s\u00e1ng lan truy\u1ec1n. C\u00f9ng nhau, nh\u1eefng hi\u1ec7u \u1ee9ng n\u00e0y khi\u1ebfn c\u00e1c xung \u00e1nh s\u00e1ng lan r\u1ed9ng ra theo th\u1eddi gian, d\u1eabn \u0111\u1ebfn s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>. S\u1ef1 ph\u00e2n t\u00e1n m\u00e0u s\u1eafc l\u00e0 m\u1ed1i quan t\u00e2m l\u1edbn h\u01a1n trong ch\u1ebf \u0111\u1ed9 \u0111\u01a1n c\u00e1p quang<\/em><\/a>, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy\u1ec1n t\u1ea3i \u0111\u01b0\u1eddng d\u00e0i trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>.<\/p>\n\n\n\n

Ph\u00e2n t\u00e1n ch\u1ebf \u0111\u1ed9 ph\u00e2n c\u1ef1c (PMD)<\/h3>\n\n\n\n

Ph\u00e2n t\u00e1n ch\u1ebf \u0111\u1ed9 ph\u00e2n c\u1ef1c<\/strong> (PMD) l\u00e0 m\u1ed9t lo\u1ea1i ph\u1ee9c t\u1ea1p h\u01a1n s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> \u0111i\u1ec1u \u0111\u00f3 x\u1ea3y ra v\u00ec \u00e1nh s\u00e1ng trong m\u1ed9t s\u1ee3i quang<\/em> c\u00f3 th\u1ec3 t\u00e1ch th\u00e0nh hai tr\u1ea1ng th\u00e1i ph\u00e2n c\u1ef1c\u2014h\u00e3y ngh\u0129 v\u1ec1 ch\u00fang nh\u01b0 hai h\u01b0\u1edbng c\u1ee7a s\u00f3ng \u00e1nh s\u00e1ng. Do nh\u1eefng khi\u1ebfm khuy\u1ebft trong s\u1ee3i, ch\u1eb3ng h\u1ea1n nh\u01b0 s\u1ef1 b\u1ea5t \u0111\u1ed1i x\u1ee9ng nh\u1ecf trong l\u00f5i ho\u1eb7c \u1ee9ng su\u1ea5t b\u00ean ngo\u00e0i, hai tr\u1ea1ng th\u00e1i ph\u00e2n c\u1ef1c n\u00e0y di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 h\u01a1i kh\u00e1c nhau. S\u1ef1 ch\u00eanh l\u1ec7ch t\u1ed1c \u0111\u1ed9 n\u00e0y khi\u1ebfn c\u00e1c xung \u00e1nh s\u00e1ng lan r\u1ed9ng, g\u00f3p ph\u1ea7n s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>. TRONG c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, PMD th\u01b0\u1eddng l\u00e0 m\u1ed1i quan t\u00e2m \u1edf ng\u01b0\u1eddi l\u1edbn tu\u1ed5i c\u00e1p quang<\/em> ho\u1eb7c tr\u00ean kho\u1ea3ng c\u00e1ch r\u1ea5t xa, ngay c\u1ea3 nh\u1eefng kh\u00e1c bi\u1ec7t nh\u1ecf c\u0169ng c\u00f3 th\u1ec3 c\u1ed9ng l\u1ea1i v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u trong m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao.<\/p>\n\n\n\n

T\u00e1c \u0111\u1ed9ng c\u1ee7a s\u1ef1 ph\u00e2n t\u00e1n l\u00ean hi\u1ec7u su\u1ea5t s\u1ee3i quang<\/h2>\n\n\n\n

Bi\u1ebfn d\u1ea1ng t\u00edn hi\u1ec7u v\u00e0 l\u1ed7i d\u1eef li\u1ec7u<\/h3>\n\n\n\n

Hi\u1ec7u \u1ee9ng t\u1ee9c th\u1eddi nh\u1ea5t c\u1ee7a s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> l\u00e0 s\u1ef1 bi\u1ebfn d\u1ea1ng t\u00edn hi\u1ec7u. Khi c\u00e1c xung \u00e1nh s\u00e1ng lan ra, ch\u00fang b\u1eaft \u0111\u1ea7u ch\u1ed3ng l\u00ean nhau, khi\u1ebfn cho b\u1ed9 thu kh\u00f3 ph\u00e2n bi\u1ec7t gi\u1eefa c\u00e1c xung ri\u00eang l\u1ebb. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, s\u1ef1 ch\u1ed3ng ch\u00e9o n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u1ed7i d\u1eef li\u1ec7u\u2014khi 1 b\u1ecb nh\u1ea7m th\u00e0nh 0 ho\u1eb7c ng\u01b0\u1ee3c l\u1ea1i. V\u00ed d\u1ee5, trong c\u00e1p quang<\/em> truy\u1ec1n d\u1eef li\u1ec7u internet, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c t\u1ec7p b\u1ecb h\u1ecfng ho\u1eb7c k\u1ebft n\u1ed1i b\u1ecb m\u1ea5t. C\u00e0ng nhi\u1ec1u s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>, \u0111\u1ed9 m\u00e9o c\u00e0ng t\u1ec7, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao vi\u1ec7c qu\u1ea3n l\u00fd \u0111\u1ed9 ph\u00e2n t\u00e1n l\u1ea1i r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 duy tr\u00ec hi\u1ec7u su\u1ea5t \u0111\u00e1ng tin c\u1eady trong c\u00e1p quang<\/em>.<\/p>\n\n\n\n

Gi\u1edbi h\u1ea1n b\u0103ng th\u00f4ng v\u00e0 kho\u1ea3ng c\u00e1ch<\/h3>\n\n\n\n

S\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> c\u0169ng gi\u1edbi h\u1ea1n kh\u1ea3 n\u0103ng b\u0103ng th\u00f4ng v\u00e0 kho\u1ea3ng c\u00e1ch c\u1ee7a c\u00e1p quang<\/em>. B\u0103ng th\u00f4ng \u0111\u1ec1 c\u1eadp \u0111\u1ebfn l\u01b0\u1ee3ng d\u1eef li\u1ec7u m\u00e0 s\u1ee3i quang c\u00f3 th\u1ec3 mang theo m\u1ed7i gi\u00e2y v\u00e0 kho\u1ea3ng c\u00e1ch \u0111\u1ec1 c\u1eadp \u0111\u1ebfn kho\u1ea3ng c\u00e1ch m\u00e0 t\u00edn hi\u1ec7u c\u00f3 th\u1ec3 truy\u1ec1n \u0111i tr\u01b0\u1edbc khi c\u1ea7n \u0111\u01b0\u1ee3c khu\u1ebfch \u0111\u1ea1i ho\u1eb7c t\u00e1i t\u1ea1o. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, \u0111\u1ed9 ph\u00e2n t\u00e1n cao l\u00e0m gi\u1ea3m b\u0103ng th\u00f4ng v\u00ec c\u00e1c xung lan truy\u1ec1n kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i ch\u1eb7t ch\u1ebd v\u1edbi nhau m\u00e0 kh\u00f4ng b\u1ecb ch\u1ed3ng ch\u00e9o. N\u00f3 c\u0169ng gi\u1edbi h\u1ea1n kho\u1ea3ng c\u00e1ch v\u00ec t\u00edn hi\u1ec7u tr\u1edf n\u00ean qu\u00e1 m\u00e9o m\u00f3 \u0111\u1ec3 c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c sau m\u1ed9t \u0111\u1ed9 d\u00e0i nh\u1ea5t \u0111\u1ecbnh. V\u00ed d\u1ee5, \u0111a ch\u1ebf \u0111\u1ed9 s\u1ee3i quang<\/em> c\u00f3 \u0111\u1ed9 ph\u00e2n t\u00e1n mode cao th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho kho\u1ea3ng c\u00e1ch ng\u1eafn, trong khi s\u1ee3i \u0111\u01a1n mode c\u00f3 \u0111\u1ed9 ph\u00e2n t\u00e1n th\u1ea5p h\u01a1n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c k\u1ebft n\u1ed1i \u0111\u01b0\u1eddng d\u00e0i.<\/p>\n\n\n\n

T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn M\u1ea1ng t\u1ed1c \u0111\u1ed9 cao<\/h3>\n\n\n\n

Trong c\u00e1c m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao, ch\u1eb3ng h\u1ea1n nh\u01b0 m\u1ea1ng h\u1ed7 tr\u1ee3 5G ho\u1eb7c trung t\u00e2m d\u1eef li\u1ec7u, s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> tr\u1edf th\u00e0nh m\u1ed9t th\u00e1ch th\u1ee9c th\u1eadm ch\u00ed c\u00f2n l\u1edbn h\u01a1n. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, c\u00e1c m\u1ea1ng n\u00e0y y\u00eau c\u1ea7u t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u r\u1ea5t cao, ngh\u0129a l\u00e0 c\u00e1c xung \u00e1nh s\u00e1ng \u0111\u01b0\u1ee3c g\u1eedi r\u1ea5t g\u1ea7n nhau. N\u1ebfu s\u1ef1 ph\u00e2n t\u00e1n khi\u1ebfn c\u00e1c xung n\u00e0y lan r\u1ed9ng v\u00e0 ch\u1ed3ng ch\u00e9o l\u00ean nhau, hi\u1ec7u su\u1ea5t c\u1ee7a m\u1ea1ng s\u1ebd b\u1ecb \u1ea3nh h\u01b0\u1edfng, d\u1eabn \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 ch\u1eadm h\u01a1n ho\u1eb7c t\u1ef7 l\u1ec7 l\u1ed7i t\u0103ng l\u00ean. V\u00ed d\u1ee5, trong m\u1ed9t trung t\u00e2m d\u1eef li\u1ec7u s\u1eed d\u1ee5ng c\u00e1p quang<\/em> \u0111\u1ec3 k\u1ebft n\u1ed1i m\u00e1y ch\u1ee7, qu\u00e1 m\u1ee9c s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn m\u1ecdi th\u1ee9, t\u1eeb l\u01b0u tr\u1eef \u0111\u00e1m m\u00e2y \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c.<\/p>\n\n\n\n

C\u00e1c chi\u1ebfn l\u01b0\u1ee3c \u0111\u1ec3 gi\u1ea3m thi\u1ec3u s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/h2>\n\n\n\n

S\u1eed d\u1ee5ng s\u1ee3i c\u00f3 ch\u1ec9 s\u1ed1 ph\u00e2n lo\u1ea1i \u0111\u1ec3 gi\u1ea3m s\u1ef1 ph\u00e2n t\u00e1n m\u00f4 th\u1ee9c<\/h3>\n\n\n\n

M\u1ed9t c\u00e1ch \u0111\u1ec3 gi\u1ea3m s\u1ef1 ph\u00e2n t\u00e1n m\u00f4 h\u00ecnh trong s\u1ee3i quang<\/em> l\u00e0 b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ch\u1ec9 s\u1ed1 ph\u00e2n lo\u1ea1i c\u00e1p quang<\/em><\/a>. Kh\u00f4ng gi\u1ed1ng nh\u01b0 s\u1ee3i quang c\u00f3 ch\u1ec9 s\u1ed1 b\u01b0\u1edbc, trong \u0111\u00f3 l\u00f5i c\u00f3 chi\u1ebft su\u1ea5t \u0111\u1ed3ng \u0111\u1ec1u, s\u1ee3i quang c\u00f3 chi\u1ebft su\u1ea5t ph\u00e2n lo\u1ea1i c\u00f3 l\u00f5i c\u00f3 chi\u1ebft su\u1ea5t gi\u1ea3m d\u1ea7n t\u1eeb t\u00e2m ra r\u00eca. \u0110\u1ed9 d\u1ed1c n\u00e0y khi\u1ebfn c\u00e1c tia s\u00e1ng di chuy\u1ec3n theo \u0111\u01b0\u1eddng cong, v\u1edbi c\u00e1c tia g\u1ea7n r\u00eca di chuy\u1ec3n nhanh h\u01a1n \u0111\u1ec3 b\u00f9 cho \u0111\u01b0\u1eddng \u0111i d\u00e0i h\u01a1n c\u1ee7a ch\u00fang. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, thi\u1ebft k\u1ebf n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng t\u1ea5t c\u1ea3 c\u00e1c tia \u0111\u1ec1u \u0111\u1ebfn \u0111\u00edch s\u1ee3i quang<\/em> \u0111\u1ed3ng th\u1eddi h\u01a1n, gi\u1ea3m thi\u1ec3u s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> v\u00e0 cho ph\u00e9p b\u0103ng th\u00f4ng cao h\u01a1n tr\u00ean kho\u1ea3ng c\u00e1ch xa h\u01a1n so v\u1edbi s\u1ee3i quang c\u00f3 ch\u1ec9 s\u1ed1 b\u01b0\u1edbc.<\/p>\n\n\n\n

K\u1ef9 thu\u1eadt b\u00f9 tr\u1eeb ph\u00e2n t\u00e1n<\/h3>\n\n\n\n

\u0110\u1ed1i v\u1edbi s\u1ef1 ph\u00e2n t\u00e1n m\u00e0u s\u1eafc, c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt b\u00f9 tr\u1eeb ph\u00e2n t\u00e1n \u0111\u1ec3 ch\u1ed1ng l\u1ea1i s\u1ef1 lan truy\u1ec1n c\u1ee7a c\u00e1c xung \u00e1nh s\u00e1ng. M\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn l\u00e0 s\u1eed d\u1ee5ng s\u1ee3i b\u00f9 t\u00e1n x\u1ea1<\/a> (DCF), l\u00e0 s\u1ee3i quang<\/em> \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u1edbi \u0111\u1eb7c \u0111i\u1ec3m ph\u00e2n t\u00e1n ng\u01b0\u1ee3c l\u1ea1i c\u1ee7a s\u1ee3i ch\u00ednh. B\u1eb1ng c\u00e1ch n\u1ed1i m\u1ed9t \u0111o\u1ea1n DCF v\u00e0o c\u00e1p quang<\/em>, s\u1ef1 ph\u00e2n t\u00e1n t\u1ed5ng th\u1ec3 c\u00f3 th\u1ec3 b\u1ecb h\u1ee7y b\u1ecf, gi\u1eef cho c\u00e1c xung \u00e1nh s\u00e1ng s\u1eafc n\u00e9t. M\u1ed9t c\u00e1ch ti\u1ebfp c\u1eadn kh\u00e1c l\u00e0 s\u1eed d\u1ee5ng b\u00f9 tr\u1eeb ph\u00e2n t\u00e1n \u0111i\u1ec7n t\u1eed t\u1ea1i m\u00e1y thu, n\u01a1i c\u00e1c thu\u1eadt to\u00e1n ph\u1ea7n m\u1ec1m hi\u1ec7u ch\u1ec9nh s\u1ef1 lan truy\u1ec1n. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, nh\u1eefng k\u1ef9 thu\u1eadt n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi \u0111\u01b0\u1eddng d\u00e0i c\u00e1p quang<\/em> n\u01a1i c\u00f3 m\u00e0u s\u1eafc s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> c\u00f3 th\u1ec3 c\u1ed9ng l\u1ea1i.<\/p>\n\n\n\n

Thi\u1ebft k\u1ebf v\u00e0 v\u1eadt li\u1ec7u s\u1ee3i ti\u00ean ti\u1ebfn<\/h3>\n\n\n\n

Hi\u1ec7n \u0111\u1ea1i c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> c\u0169ng l\u00e0m gi\u1ea3m nh\u1eb9 s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> th\u00f4ng qua c\u00e1c thi\u1ebft k\u1ebf v\u00e0 v\u1eadt li\u1ec7u s\u1ee3i ti\u00ean ti\u1ebfn. V\u00ed d\u1ee5, m\u1ed9t s\u1ed1 ch\u1ebf \u0111\u1ed9 \u0111\u01a1n s\u1ee3i quang<\/em> \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u1edbi m\u1ed9t c\u1ea5u h\u00ecnh chi\u1ebft su\u1ea5t c\u1ee5 th\u1ec3 \u0111\u1ec3 gi\u1ea3m thi\u1ec3u s\u1ef1 ph\u00e2n t\u00e1n m\u00e0u \u1edf m\u1ed9t s\u1ed1 b\u01b0\u1edbc s\u00f3ng nh\u1ea5t \u0111\u1ecbnh, th\u01b0\u1eddng l\u00e0 kho\u1ea3ng 1550 nanomet, n\u01a1i m\u1ea5t t\u00edn hi\u1ec7u c\u0169ng th\u1ea5p. Ngo\u00e0i ra, s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u th\u1ee7y tinh tinh khi\u1ebft h\u01a1n l\u00e0m gi\u1ea3m s\u1ef1 ph\u00e2n t\u00e1n v\u1eadt li\u1ec7u b\u1eb1ng c\u00e1ch \u0111\u1ea3m b\u1ea3o \u00e1nh s\u00e1ng truy\u1ec1n \u0111i \u0111\u1ed3ng \u0111\u1ec1u h\u01a1n qua c\u00e1p quang<\/em>. TRONG c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, nh\u1eefng ti\u1ebfn b\u1ed9 n\u00e0y cho ph\u00e9p c\u00e1p quang<\/em> \u0111\u1ec3 h\u1ed7 tr\u1ee3 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u cao h\u01a1n tr\u00ean kho\u1ea3ng c\u00e1ch xa h\u01a1n v\u1edbi \u00edt h\u01a1n s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>.<\/p>\n\n\n\n

Ph\u00e2n t\u00e1n trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf<\/h2>\n\n\n\n

C\u00e1p quang trong m\u1ea1ng vi\u1ec5n th\u00f4ng<\/h3>\n\n\n\n

Trong m\u1ea1ng vi\u1ec5n th\u00f4ng, c\u00e1p quang<\/em> \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 truy\u1ec1n d\u1eef li\u1ec7u qua nh\u1eefng kho\u1ea3ng c\u00e1ch xa, ch\u1eb3ng h\u1ea1n nh\u01b0 gi\u1eefa c\u00e1c th\u00e0nh ph\u1ed1 ho\u1eb7c gi\u1eefa c\u00e1c l\u1ee5c \u0111\u1ecba. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, ch\u1ebf \u0111\u1ed9 \u0111\u01a1n s\u1ee3i quang<\/em> th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00ec ch\u00fang c\u00f3 gi\u00e1 tr\u1ecb th\u1ea5p h\u01a1n s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> so v\u1edbi s\u1ee3i \u0111a mode. Tuy nhi\u00ean, t\u00e1n s\u1eafc v\u00e0 PMD v\u1eabn c\u00f3 th\u1ec3 l\u00e0 v\u1ea5n \u0111\u1ec1 tr\u00ean nh\u1eefng kho\u1ea3ng c\u00e1ch xa n\u00e0y. C\u00e1c k\u1ef9 s\u01b0 vi\u1ec5n th\u00f4ng s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt b\u00f9 t\u00e1n s\u1eafc, nh\u01b0 DCF, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00edn hi\u1ec7u v\u1eabn r\u00f5 r\u00e0ng, \u0111\u1ea3m b\u1ea3o r\u1eb1ng cu\u1ed9c g\u1ecdi \u0111i\u1ec7n tho\u1ea1i ho\u1eb7c k\u1ebft n\u1ed1i internet kh\u00f4ng b\u1ecb m\u1ea5t ngay c\u1ea3 sau khi di chuy\u1ec3n h\u00e0ng ngh\u00ecn km qua c\u00e1p quang<\/em>.<\/p>\n\n\n\n

Trung t\u00e2m d\u1eef li\u1ec7u v\u00e0 m\u1ea1ng c\u1ee5c b\u1ed9<\/h3>\n\n\n\n

Trong c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u v\u00e0 m\u1ea1ng c\u1ee5c b\u1ed9 (LAN), \u0111a ch\u1ebf \u0111\u1ed9 c\u00e1p quang<\/em> ph\u1ed5 bi\u1ebfn do kh\u1ea3 n\u0103ng x\u1eed l\u00fd b\u0103ng th\u00f4ng cao tr\u00ean kho\u1ea3ng c\u00e1ch ng\u1eafn. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, ph\u01b0\u01a1ng th\u1ee9c s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> l\u00e0 m\u1ed1i quan t\u00e2m ch\u00ednh \u1edf \u0111\u00e2y, v\u00ec nhi\u1ec1u \u0111\u01b0\u1eddng d\u1eabn \u00e1nh s\u00e1ng trong s\u1ee3i \u0111a ch\u1ebf \u0111\u1ed9 g\u00e2y ra s\u1ef1 lan truy\u1ec1n \u0111\u00e1ng k\u1ec3. S\u1eed d\u1ee5ng ch\u1ec9 s\u1ed1 ph\u00e2n lo\u1ea1i s\u1ee3i quang<\/em> gi\u00fap gi\u1ea3m s\u1ef1 ph\u00e2n t\u00e1n n\u00e0y, cho ph\u00e9p c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u duy tr\u00ec k\u1ebft n\u1ed1i nhanh gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7, thi\u1ebft b\u1ecb chuy\u1ec3n m\u1ea1ch v\u00e0 thi\u1ebft b\u1ecb l\u01b0u tr\u1eef m\u00e0 kh\u00f4ng l\u00e0m m\u00e9o t\u00edn hi\u1ec7u.<\/p>\n\n\n\n

\u1ee8ng d\u1ee5ng c\u00e1p quang \u0111\u1ebfn t\u1eadn nh\u00e0 (FTTH)<\/h3>\n\n\n\n

Trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00e1p quang \u0111\u1ebfn t\u1eadn nh\u00e0 (FTTH), c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> mang internet t\u1ed1c \u0111\u1ed9 cao tr\u1ef1c ti\u1ebfp \u0111\u1ebfn n\u01a1i c\u01b0 tr\u00fa b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1p quang<\/em>. TRONG s\u1ee3i quang<\/em> \u0111\u1ed1i v\u1edbi FTTH, c\u1ea3 ph\u00e2n t\u00e1n s\u1eafc \u0111\u1ed9 v\u00e0 ph\u01b0\u01a1ng th\u1ee9c \u0111\u1ec1u c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t, \u0111\u1eb7c bi\u1ec7t n\u1ebfu qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t li\u00ean quan \u0111\u1ebfn c\u00e1c s\u1ee3i quang \u0111a ch\u1ebf \u0111\u1ed9 c\u0169 ho\u1eb7c ch\u1ea1y d\u00e0i. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng ch\u1ebf \u0111\u1ed9 \u0111\u01a1n c\u00e1p quang<\/em> ho\u1eb7c s\u1ee3i ch\u1ec9 s\u1ed1 ph\u00e2n lo\u1ea1i hi\u1ec7n \u0111\u1ea1i, c\u00e1c nh\u00e0 cung c\u1ea5p c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>, \u0111\u1ea3m b\u1ea3o r\u1eb1ng ch\u1ee7 nh\u00e0 c\u00f3 th\u1ec3 t\u1eadn h\u01b0\u1edfng internet nhanh, \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 ph\u00e1t tr\u1ef1c tuy\u1ebfn, ch\u01a1i game v\u00e0 l\u00e0m vi\u1ec7c t\u1eeb xa.<\/p>\n\n\n\n

Xu h\u01b0\u1edbng t\u01b0\u01a1ng lai trong vi\u1ec7c qu\u1ea3n l\u00fd s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/h2>\n\n\n\n

Nh\u1eefng \u0111\u1ed5i m\u1edbi trong thi\u1ebft k\u1ebf s\u1ee3i quang<\/h3>\n\n\n\n

T\u01b0\u01a1ng lai c\u1ee7a s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> c\u00f3 v\u1ebb \u0111\u1ea7y h\u1ee9a h\u1eb9n, v\u1edbi nh\u1eefng \u0111\u1ed5i m\u1edbi \u0111ang di\u1ec5n ra trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>. C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111ang ph\u00e1t tri\u1ec3n c\u00e1c lo\u1ea1i m\u1edbi s\u1ee3i quang<\/em> v\u1edbi c\u00e1c c\u1ea5u h\u00ecnh ph\u00e2n t\u00e1n th\u1eadm ch\u00ed c\u00f2n th\u1ea5p h\u01a1n, ch\u1eb3ng h\u1ea1n nh\u01b0 c\u00e1c s\u1ee3i \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a cho c\u00e1c ph\u1ea1m vi b\u01b0\u1edbc s\u00f3ng c\u1ee5 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ea1ng t\u1ed1c \u0111\u1ed9 cao. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, nh\u1eefng thi\u1ebft k\u1ebf n\u00e0y s\u1ebd cho ph\u00e9p c\u00e1p quang<\/em> \u0111\u1ec3 h\u1ed7 tr\u1ee3 t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u cao h\u01a1n tr\u00ean kho\u1ea3ng c\u00e1ch xa h\u01a1n, gi\u1ea3m t\u00e1c \u0111\u1ed9ng c\u1ee7a s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> trong c\u00e1c m\u1ea1ng th\u1ebf h\u1ec7 ti\u1ebfp theo nh\u01b0 6G.<\/p>\n\n\n\n

K\u1ef9 thu\u1eadt b\u00f9 ph\u00e2n t\u00e1n n\u00e2ng cao<\/h3>\n\n\n\n

T\u01b0\u01a1ng lai c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> c\u0169ng s\u1ebd th\u1ea5y nh\u1eefng ti\u1ebfn b\u1ed9 trong vi\u1ec7c b\u00f9 tr\u1eeb s\u1ef1 ph\u00e2n t\u00e1n. V\u00ed d\u1ee5, c\u00e1c thi\u1ebft b\u1ecb quang t\u1eed nh\u01b0 m\u1ea1ng Bragg s\u1ee3i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh c\u00f3 ch\u1ecdn l\u1ecdc th\u1eddi gian c\u1ee7a c\u00e1c b\u01b0\u1edbc s\u00f3ng \u00e1nh s\u00e1ng, ch\u1ed1ng l\u1ea1i s\u1ef1 thay \u0111\u1ed5i m\u00e0u s\u1eafc s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em>. Ngo\u00e0i ra, c\u00e1c thu\u1eadt to\u00e1n h\u1ecdc m\u00e1y \u0111ang \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n v\u00e0 hi\u1ec7u ch\u1ec9nh s\u1ef1 ph\u00e2n t\u00e1n theo th\u1eddi gian th\u1ef1c, c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1p quang<\/em> trong c\u00e1c m\u1ea1ng l\u01b0\u1edbi n\u0103ng \u0111\u1ed9ng, t\u1ed1c \u0111\u1ed9 cao.<\/p>\n\n\n\n

C\u00e1c \u1ee9ng d\u1ee5ng m\u1edbi n\u1ed5i v\u00e0 nhu c\u1ea7u c\u1ee7a ch\u00fang<\/h3>\n\n\n\n

B\u1eb0NG c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> m\u1edf r\u1ed9ng sang c\u00e1c \u1ee9ng d\u1ee5ng m\u1edbi n\u1ed5i\u2014nh\u01b0 xe t\u1ef1 h\u00e0nh, th\u00e0nh ph\u1ed1 th\u00f4ng minh v\u00e0 Internet v\u1ea1n v\u1eadt (IoT)\u2014nhu c\u1ea7u qu\u1ea3n l\u00fd s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> s\u1ebd ph\u00e1t tri\u1ec3n. C\u00e1c \u1ee9ng d\u1ee5ng n\u00e0y y\u00eau c\u1ea7u \u0111\u1ed9 tr\u1ec5 c\u1ef1c th\u1ea5p v\u00e0 b\u0103ng th\u00f4ng cao, ngh\u0129a l\u00e0 ngay c\u1ea3 l\u01b0\u1ee3ng ph\u00e2n t\u00e1n nh\u1ecf c\u0169ng c\u00f3 th\u1ec3 g\u00e2y ra s\u1ef1 c\u1ed1. Trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>, nh\u1eefng ph\u00e1t tri\u1ec3n trong t\u01b0\u01a1ng lai s\u1ebd t\u1eadp trung v\u00e0o vi\u1ec7c t\u1ea1o ra s\u1ee3i quang<\/em> V\u00e0 c\u00e1p quang<\/em> gi\u00fap gi\u1ea3m thi\u1ec3u m\u1ecdi lo\u1ea1i ph\u00e2n t\u00e1n, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t \u0111\u00e1ng tin c\u1eady trong c\u00e1c h\u1ec7 th\u1ed1ng ti\u00ean ti\u1ebfn n\u00e0y.<\/p>\n\n\n\n

K\u1ebft lu\u1eadn: Gi\u1ea3i quy\u1ebft v\u1ea5n \u0111\u1ec1 ph\u00e2n t\u00e1n \u0111\u1ec3 c\u00f3 hi\u1ec7u su\u1ea5t s\u1ee3i quang t\u1ed1t h\u01a1n<\/h2>\n\n\n\n

S\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> c\u00f3 th\u1ec3 nghe gi\u1ed1ng nh\u01b0 m\u1ed9t chi ti\u1ebft k\u1ef9 thu\u1eadt nh\u1ecf, nh\u01b0ng n\u00f3 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1p quang<\/em>. B\u1eb1ng c\u00e1ch hi\u1ec3u c\u00e1c lo\u1ea1i ph\u00e2n t\u00e1n\u2014ch\u1ebf \u0111\u1ed9 ph\u00e2n c\u1ef1c, ch\u1ebf \u0111\u1ed9 s\u1eafc \u0111\u1ed9 v\u00e0 ch\u1ebf \u0111\u1ed9 ph\u00e2n c\u1ef1c\u2014v\u00e0 t\u00e1c \u0111\u1ed9ng c\u1ee7a ch\u00fang, b\u1ea1n c\u00f3 th\u1ec3 th\u1ea5y l\u00fd do t\u1ea1i sao vi\u1ec7c qu\u1ea3n l\u00fd s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> r\u1ea5t quan tr\u1ecdng trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em>. T\u1eeb vi\u1ec7c s\u1eed d\u1ee5ng ch\u1ec9 s\u1ed1 ph\u00e2n lo\u1ea1i s\u1ee3i quang<\/em> \u0111\u1ed1i v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt b\u00f9 ti\u00ean ti\u1ebfn, c\u00f3 nh\u1eefng c\u00e1ch th\u1ef1c t\u1ebf \u0111\u1ec3 gi\u1ea3m s\u1ef1 ph\u00e2n t\u00e1n v\u00e0 gi\u1eef cho m\u1ea1ng c\u1ee7a b\u1ea1n ho\u1ea1t \u0111\u1ed9ng tr\u01a1n tru. Cho d\u00f9 b\u1ea1n \u0111ang thi\u1ebft l\u1eadp k\u1ebft n\u1ed1i internet t\u1ea1i nh\u00e0, qu\u1ea3n l\u00fd trung t\u00e2m d\u1eef li\u1ec7u hay thi\u1ebft k\u1ebf m\u1ea1ng vi\u1ec5n th\u00f4ng, h\u00e3y gi\u1ea3i quy\u1ebft s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang<\/em> \u0111\u1ea3m b\u1ea3o truy\u1ec1n d\u1eef li\u1ec7u nhanh ch\u00f3ng, \u0111\u00e1ng tin c\u1eady. Nh\u01b0 c\u00f4ng ngh\u1ec7 s\u1ee3i quang<\/em> ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, vi\u1ec7c \u0111i tr\u01b0\u1edbc s\u1ef1 ph\u00e2n t\u00e1n s\u1ebd gi\u00fap gi\u1ea3i ph\u00f3ng to\u00e0n b\u1ed9 ti\u1ec1m n\u0103ng c\u1ee7a c\u00e1p quang<\/em> cho t\u01b0\u01a1ng lai.<\/p>","protected":false},"excerpt":{"rendered":"

H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng vi\u1ec7c g\u1eedi tin nh\u1eafn qua c\u00e1p quang\u2014m\u1ed9t s\u1ee3i th\u1ee7y tinh nh\u1ecf truy\u1ec1n t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng v\u1edbi t\u1ed1c \u0111\u1ed9 \u0111\u00e1ng kinh ng\u1ea1c. B\u00e2y gi\u1edd, h\u00e3y h\u00ecnh dung tin nh\u1eafn \u0111\u00f3 \u0111\u1ebfn m\u1ed9t c\u00e1ch l\u1ed9n x\u1ed9n v\u00ec c\u00e1c t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng lan truy\u1ec1n tr\u00ean \u0111\u01b0\u1eddng \u0111i. S\u1ef1 lan truy\u1ec1n n\u00e0y, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 s\u1ef1 ph\u00e2n t\u00e1n trong s\u1ee3i quang, l\u00e0 m\u1ed9t th\u00e1ch th\u1ee9c ch\u00ednh trong c\u00f4ng ngh\u1ec7 s\u1ee3i quang. S\u1ef1 ph\u00e2n t\u00e1n c\u00f3 th\u1ec3 l\u00e0m ch\u1eadm t\u1ed1c \u0111\u1ed9 [\u2026]<\/p>","protected":false},"author":1,"featured_media":3556,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"34","_seopress_titles_title":"What is Dispersion in Optical Fiber? Definition, Types and More","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[34],"tags":[],"class_list":["post-3553","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\/3553","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=3553"}],"version-history":[{"count":9,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/3553\/revisions"}],"predecessor-version":[{"id":3569,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/3553\/revisions\/3569"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/media\/3556"}],"wp:attachment":[{"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/media?parent=3553"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/categories?post=3553"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/tags?post=3553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}