{"id":2548,"date":"2026-04-09T00:00:00","date_gmt":"2026-04-09T00:00:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/dispersion-compensation-module-dcm-in-dwdm\/"},"modified":"2026-06-22T03:35:44","modified_gmt":"2026-06-22T03:35:44","slug":"dispersion-compensation-module-dcm-in-dwdm","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/dispersion-compensation-module-dcm-in-dwdm","title":{"rendered":"M\u00f4-\u0111un b\u00f9 t\u00e1n s\u1eafc (DCM) trong DWDM l\u00e0 g\u00ec?"},"content":{"rendered":"
\"What<\/figure>\n\n\n\n

Trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng quang hi\u1ec7n \u0111\u1ea1i c\u00f3 dung l\u01b0\u1ee3ng cao, \u0111\u1eb7c bi\u1ec7t l\u00e0 Ph\u00e2n chia b\u01b0\u1edbc s\u00f3ng d\u00e0y \u0111\u1eb7c<\/a> c\u00e1c m\u1ea1ng (DWDM), vi\u1ec7c duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u00edn hi\u1ec7u tr\u00ean kho\u1ea3ng c\u00e1ch d\u00e0i l\u00e0 m\u1ed9t trong nh\u1eefng th\u00e1ch th\u1ee9c k\u1ef9 thu\u1eadt quan tr\u1ecdng nh\u1ea5t. Khi t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u ti\u1ebfp t\u1ee5c t\u0103ng t\u1eeb 10G l\u00ean 100G v\u00e0 cao h\u01a1n n\u1eefa, c\u00e1c suy hao quang nh\u01b0 t\u00e1n s\u1eafc chromatic tr\u1edf th\u00e0nh y\u1ebfu t\u1ed1 gi\u1edbi h\u1ea1n ch\u00ednh \u0111\u1ed1i v\u1edbi hi\u1ec7u n\u0103ng truy\u1ec1n d\u1eabn.<\/p>\n\n\n\n

M\u1ed9t M\u00f4-\u0111un B\u00f9 T\u00e1n S\u1eafc (DCM) l\u00e0 th\u00e0nh ph\u1ea7n then ch\u1ed1t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ea1ng quang \u0111\u01b0\u1eddng d\u00e0i truy\u1ec1n th\u1ed1ng nh\u1eb1m gi\u1ea3m thi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y. Thi\u1ebft b\u1ecb n\u00e0y \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 ch\u1ed1ng l\u1ea1i hi\u1ec7n t\u01b0\u1ee3ng lan r\u1ed9ng c\u1ee7a c\u00e1c xung quang khi ch\u00fang di chuy\u1ec3n qua s\u1ee3i quang ch\u1ebf \u0111\u1ed9 \u0111\u01a1n ti\u00eau chu\u1ea9n (SMF), n\u01a1i c\u00e1c b\u01b0\u1edbc s\u00f3ng \u00e1nh s\u00e1ng kh\u00e1c nhau lan truy\u1ec1n v\u1edbi t\u1ed1c \u0111\u1ed9 h\u01a1i kh\u00e1c nhau. N\u1ebfu kh\u00f4ng \u0111\u01b0\u1ee3c b\u00f9, hi\u1ec7n t\u01b0\u1ee3ng t\u00e1n s\u1eafc n\u00e0y d\u1eabn \u0111\u1ebfn s\u1ef1 gi\u00e3n r\u1ed9ng xung, nhi\u1ec5u gi\u1eefa c\u00e1c k\u00fd hi\u1ec7u<\/a> (ISI), v\u00e0 cu\u1ed1i c\u00f9ng l\u00e0 t\u1ef7 l\u1ec7 l\u1ed7i bit cao h\u01a1n t\u1ef7 l\u1ec7 l\u1ed7i bit
<\/a> (BER).
.<\/p>\n\n\n\n

B\u1eb1ng c\u00e1ch \u0111\u01b0a v\u00e0o l\u01b0\u1ee3ng t\u00e1n s\u1eafc \u00e2m \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t, m\u1ed9t DCM kh\u00f4i ph\u1ee5c l\u1ea1i h\u00ecnh d\u1ea1ng ban \u0111\u1ea7u c\u1ee7a t\u00edn hi\u1ec7u quang, cho ph\u00e9p t\u00edn hi\u1ec7u truy\u1ec1n \u0111i xa h\u01a1n m\u00e0 kh\u00f4ng b\u1ecb suy gi\u1ea3m. \u0110i\u1ec1u n\u00e0y khi\u1ebfn DCM tr\u1edf th\u00e0nh kh\u1ed1i x\u00e2y d\u1ef1ng thi\u1ebft y\u1ebfu trong c\u00e1c h\u1ec7 th\u1ed1ng DWDM c\u0169, m\u1ea1ng \u0111\u00f4 th\u1ecb (metro) v\u00e0 c\u01a1 s\u1edf h\u1ea1 t\u1ea7ng x\u01b0\u01a1ng s\u1ed1ng \u0111\u01b0\u1eddng d\u00e0i.<\/p>\n\n\n\n

Tuy nhi\u00ean, c\u00f9ng v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1c c\u00f4ng ngh\u1ec7 quang \u0111\u1ed3ng pha hi\u1ec7n \u0111\u1ea1i v\u00e0 k\u1ef9 thu\u1eadt b\u00f9 t\u00e1n s\u1eafc d\u1ef1a tr\u00ean x\u1eed l\u00fd t\u00edn hi\u1ec7u s\u1ed1 (ti\u00ean ti\u1ebfn<\/a>)\u2014c\u00e1c m\u1ea1ng quang th\u1ebf h\u1ec7 m\u1edbi hi\u1ec7n nay ng\u00e0y c\u00e0ng \u00edt ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e1c m\u00f4-\u0111un b\u00f9 v\u1eadt l\u00fd v\u00e0 nhi\u1ec1u h\u01a1n v\u00e0o x\u1eed l\u00fd c\u1ea5p b\u1ed9 thu ph\u00e1t ti\u00ean ti\u1ebfn.<\/p>\n\n\n\n

Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u DCM l\u00e0 g\u00ec, c\u00e1ch th\u1ee9c ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3 trong c\u00e1c h\u1ec7 th\u1ed1ng DWDM, v\u1ecb tr\u00ed \u1ee9ng d\u1ee5ng v\u00e0 c\u00e1ch so s\u00e1nh v\u1edbi c\u00e1c gi\u1ea3i ph\u00e1p hi\u1ec7n \u0111\u1ea1i nh\u01b0 EDFA<\/a> v\u00e0 quang h\u1ecdc \u0111\u1ed3ng pha. \u0110i\u1ec1u n\u00e0y s\u1ebd cung c\u1ea5p c\u00e1i nh\u00ecn to\u00e0n di\u1ec7n v\u1ec1 vai tr\u00f2 c\u1ee7a DCM trong c\u1ea3 ki\u1ebfn tr\u00fac m\u1ea1ng quang c\u0169 v\u00e0 \u0111\u01b0\u01a1ng \u0111\u1ea1i.<\/p>\n\n\n\n

\ud83d\udd04 DCM L\u00e0 G\u00ec?<\/h2>\n\n\n\n

M\u1ed9t M\u00f4-\u0111un B\u00f9 T\u00e1n S\u1eafc (DCM) l\u00e0 thi\u1ebft b\u1ecb \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ea1ng quang DWDM nh\u1eb1m hi\u1ec7u ch\u1ec9nh hi\u1ec7n t\u01b0\u1ee3ng t\u00e1n s\u1eafc chromatic \u2014 m\u1ed9t d\u1ea1ng suy hao truy\u1ec1n d\u1eabn g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng lan r\u1ed9ng c\u00e1c xung quang khi ch\u00fang di chuy\u1ec3n qua s\u1ee3i quang.<\/p>\n\n\n\n

\"What<\/figure>\n\n\n\n

N\u00f3i m\u1ed9t c\u00e1ch \u0111\u01a1n gi\u1ea3n, DCM kh\u00f4i ph\u1ee5c ch\u1ea5t l\u01b0\u1ee3ng t\u00edn hi\u1ec7u b\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng t\u00e1n s\u1eafc \u00e2m \u0111\u1ec3 ch\u1ed1ng l\u1ea1i s\u1ef1 m\u00e9o m\u00f3 t\u00edch l\u0169y trong s\u1ee3i quang ch\u1ebf \u0111\u1ed9 \u0111\u01a1n ti\u00eau chu\u1ea9n. Vi\u1ec7c n\u00e0y gi\u00fap duy tr\u00ec s\u1ef1 ph\u00e2n t\u00e1ch r\u00f5 r\u00e0ng gi\u1eefa c\u00e1c t\u00edn hi\u1ec7u v\u00e0 gi\u1ea3m l\u1ed7i bit trong truy\u1ec1n d\u1eabn kho\u1ea3ng c\u00e1ch xa.<\/p>\n\n\n\n

C\u00e1c DCM th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng DWDM \u0111\u00f4 th\u1ecb (metro), khu v\u1ef1c v\u00e0 \u0111\u01b0\u1eddng d\u00e0i, n\u01a1i chi\u1ec1u d\u00e0i c\u00e1c \u0111o\u1ea1n s\u1ee3i \u0111\u1ee7 l\u1edbn \u0111\u1ec3 t\u00e1n s\u1eafc \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn hi\u1ec7u n\u0103ng. Ch\u00fang \u0111\u01b0\u1ee3c \u0111\u1eb7t trong h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng d\u00e2y quang c\u00f9ng v\u1edbi c\u00e1c th\u00e0nh ph\u1ea7n nh\u01b0 b\u1ed9 khu\u1ebfch \u0111\u1ea1i v\u00e0 b\u1ed9 gh\u00e9p k\u00eanh, nh\u01b0ng kh\u00f4ng th\u1ef1c hi\u1ec7n khu\u1ebfch \u0111\u1ea1i hay x\u1eed l\u00fd \u0111i\u1ec7n.<\/p>\n\n\n\n

Kh\u00e1c v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u1ed3ng pha hi\u1ec7n \u0111\u1ea1i s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt b\u00f9 d\u1ef1a tr\u00ean DSP, c\u00e1c DCM truy\u1ec1n th\u1ed1ng th\u1ef1c hi\u1ec7n hi\u1ec7u ch\u1ec9nh t\u00e1n s\u1eafc trong mi\u1ec1n quang, do \u0111\u00f3 r\u1ea5t quan tr\u1ecdng trong ki\u1ebfn tr\u00fac DWDM c\u0169.<\/p>\n\n\n\n

T\u00f3m l\u1ea1i:DCM l\u00e0 m\u1ed9t m\u00f4-\u0111un trong h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng d\u00e2y DWDM nh\u1eb1m b\u00f9 t\u00e1n s\u1eafc chromatic \u0111\u1ec3 gi\u1eef cho t\u00edn hi\u1ec7u quang kho\u1ea3ng c\u00e1ch xa \u1ed5n \u0111\u1ecbnh v\u00e0 c\u00f3 th\u1ec3 \u0111\u1ecdc \u0111\u01b0\u1ee3c.<\/p>\n\n\n\n

Th\u00e0nh Ph\u1ea7n Th\u01b0\u1eddng C\u00f3 Trong M\u1ed9t DCM<\/h3>\n\n\n\n

C\u00e1c DCM truy\u1ec1n th\u1ed1ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng d\u1ef1a tr\u00ean s\u1ee3i b\u00f9 t\u00e1n s\u1eafc (DCF) ho\u1eb7c c\u00e1c th\u00e0nh ph\u1ea7n quang t\u01b0\u01a1ng t\u1ef1, c\u00f3 kh\u1ea3 n\u0103ng t\u1ea1o ra \u0111\u1eb7c tuy\u1ebfn t\u00e1n s\u1eafc \u00e2m nh\u1eb1m tri\u1ec7t ti\u00eau t\u00e1n s\u1eafc d\u01b0\u01a1ng t\u00edch l\u0169y trong s\u1ee3i truy\u1ec1n d\u1eabn. T\u00e0i li\u1ec7u h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t \u0111\u1ed1i v\u1edbi c\u00e1c m\u00f4-\u0111un DCM th\u1ee5 \u0111\u1ed9ng m\u00f4 t\u1ea3 ch\u00fang l\u00e0 c\u00e1c thi\u1ebft b\u1ecb th\u1ee5 \u0111\u1ed9ng cung c\u1ea5p t\u00e1n s\u1eafc \u00e2m cho c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n d\u1eabn DWDM v\u00e0 t\u0103ng ph\u1ea1m vi truy\u1ec1n d\u1eabn.<\/p>\n\n\n\n

\ud83d\udd04 DCM Ho\u1ea1t \u0110\u1ed9ng Nh\u01b0 Th\u1ebf N\u00e0o Trong H\u1ec7 Th\u1ed1ng DWDM?<\/h2>\n\n\n\n

M\u1ed9t M\u00f4-\u0111un B\u00f9 T\u00e1n S\u1eafc (DCM) ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch \u0111\u01b0a v\u00e0o m\u1ed9t l\u01b0\u1ee3ng t\u00e1n s\u1eafc chromatic \u00e2m \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t nh\u1eb1m ch\u1ed1ng l\u1ea1i hi\u1ec7n t\u01b0\u1ee3ng t\u00e1n s\u1eafc t\u00edch l\u0169y trong s\u1ee3i quang ch\u1ebf \u0111\u1ed9 \u0111\u01a1n ti\u00eau chu\u1ea9n trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eabn DWDM. Qu\u00e1 tr\u00ecnh n\u00e0y gi\u00fap kh\u00f4i ph\u1ee5c t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a t\u00edn hi\u1ec7u quang m\u00e0 kh\u00f4ng c\u1ea7n chuy\u1ec3n \u0111\u1ed5i t\u00edn hi\u1ec7u sang mi\u1ec1n \u0111i\u1ec7n.<\/p>\n\n\n\n

Trong m\u1ed9t h\u1ec7 th\u1ed1ng DWDM, nhi\u1ec1u k\u00eanh b\u01b0\u1edbc s\u00f3ng di chuy\u1ec3n qua c\u00e1c \u0111o\u1ea1n s\u1ee3i d\u00e0i. Khi t\u00edn hi\u1ec7u lan truy\u1ec1n, c\u00e1c b\u01b0\u1edbc s\u00f3ng kh\u00e1c nhau di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 h\u01a1i kh\u00e1c nhau, g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng gi\u00e3n r\u1ed9ng xung v\u00e0 m\u00e9o t\u00edn hi\u1ec7u. \u0110\u00e2y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 t\u00e1n s\u1eafc chromatic, v\u00e0 m\u1ee9c \u0111\u1ed9 nghi\u00eam tr\u1ecdng c\u1ee7a n\u00f3 gia t\u0103ng theo kho\u1ea3ng c\u00e1ch truy\u1ec1n d\u1eabn v\u00e0 t\u1ed1c \u0111\u1ed9 bit cao h\u01a1n.<\/p>\n\n\n\n

\"How<\/figure>\n\n\n\n

Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a DCM tr\u00ean \u0111\u01b0\u1eddng truy\u1ec1n quang<\/h3>\n\n\n\n

DCM \u0111\u01b0\u1ee3c b\u1ed1 tr\u00ed chi\u1ebfn l\u01b0\u1ee3c trong h\u1ec7 th\u1ed1ng \u0111\u01b0\u1eddng d\u00e2y DWDM gi\u1eefa c\u00e1c \u0111o\u1ea1n s\u1ee3i v\u00e0 b\u1ed9 khu\u1ebfch \u0111\u1ea1i quang (EDFA). Vai tr\u00f2 c\u1ee7a n\u00f3 l\u00e0 c\u00e2n b\u1eb1ng l\u01b0\u1ee3ng t\u00e1n s\u1eafc t\u00edch l\u0169y t\u1eeb s\u1ee3i truy\u1ec1n d\u1eabn.<\/p>\n\n\n\n

D\u00f2ng t\u00edn hi\u1ec7u \u0111i\u1ec3n h\u00ecnh nh\u01b0 sau:<\/p>\n\n\n\n