{"id":3129,"date":"2025-03-25T08:37:32","date_gmt":"2025-03-25T08:37:32","guid":{"rendered":"https:\/\/commmesh.com\/?p=3129"},"modified":"2025-04-03T06:44:28","modified_gmt":"2025-04-03T06:44:28","slug":"what-is-otdr","status":"publish","type":"post","link":"https:\/\/commmesh.com\/vi\/what-is-otdr\/","title":{"rendered":"OTDR l\u00e0 g\u00ec: T\u1ed5ng quan to\u00e0n di\u1ec7n"},"content":{"rendered":"<p>H\u00ecnh \u1ea3nh m\u1ed9t <em>M\u00e1y \u0111o OTDR<\/em> nh\u01b0 m\u1ed9t th\u00e1m t\u1eed tinh m\u1eaft c\u1ee7a m\u1ea1ng l\u01b0\u1edbi c\u00e1p quang\u2014m\u1ed9t c\u00f4ng c\u1ee5 kh\u00e1m ph\u00e1 c\u00e1c chi ti\u1ebft \u1ea9n gi\u1ea5u c\u1ee7a c\u00e1p truy\u1ec1n d\u1eef li\u1ec7u qua kho\u1ea3ng c\u00e1ch xa, gi\u1ed1ng nh\u01b0 m\u1ed9t th\u00e1m t\u1eed gh\u00e9p c\u00e1c manh m\u1ed1i l\u1ea1i v\u1edbi nhau. \u0110\u01b0\u1ee3c g\u1ecdi l\u00e0 M\u00e1y \u0111o ph\u1ea3n x\u1ea1 mi\u1ec1n th\u1eddi gian quang h\u1ecdc, m\u1ed9t <em><a href=\"https:\/\/en.wikipedia.org\/wiki\/Optical_time-domain_reflectometer\" target=\"_blank\" rel=\"noreferrer noopener\">M\u00e1y \u0111o OTDR<\/a><\/em> l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho b\u1ea5t k\u1ef3 ai l\u00e0m vi\u1ec7c v\u1edbi s\u1ee3i quang, t\u1eeb k\u1ef9 s\u01b0 vi\u1ec5n th\u00f4ng \u0111\u1ebfn k\u1ef9 thu\u1eadt vi\u00ean trung t\u00e2m d\u1eef li\u1ec7u. N\u1ebfu b\u1ea1n \u0111\u00e3 t\u1eebng t\u1ef1 h\u1ecfi <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em>, \u0111\u00f3 l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb ki\u1ec3m tra v\u00e0 l\u1eadp b\u1ea3n \u0111\u1ed3 c\u00e1p quang, ph\u00e1t hi\u1ec7n m\u1ea5t t\u00edn hi\u1ec7u, m\u1ed1i n\u1ed1i v\u00e0 l\u1ed7i v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c cao. H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111i s\u00e2u v\u00e0o <em>ki\u1ec3m tra OTDR l\u00e0 g\u00ec<\/em>, c\u01a1 ch\u1ebf, \u1ee9ng d\u1ee5ng v\u00e0 th\u1eadm ch\u00ed c\u1ea3 c\u00e2n nh\u1eafc v\u1ec1 gi\u00e1 c\u1ea3, cung c\u1ea5p b\u1ee9c tranh to\u00e0n c\u1ea3nh cho c\u1ea3 chuy\u00ean gia v\u00e0 ng\u01b0\u1eddi \u0111am m\u00ea. V\u1edbi ch\u1ea5t l\u01b0\u1ee3ng h\u00e0ng \u0111\u1ea7u <em>M\u00e1y \u0111o OTDR<\/em> thi\u1ebft b\u1ecb c\u00f3 s\u1eb5n t\u1eeb CommMesh, ch\u00fang ta h\u00e3y kh\u00e1m ph\u00e1 c\u00e1ch c\u00f4ng c\u1ee5 n\u00e0y gi\u00fap m\u1ea1ng c\u00e1p quang ho\u1ea1t \u0111\u1ed9ng tr\u01a1n tru.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">OTDR trong c\u00e1p quang l\u00e0 g\u00ec?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/What-Is-OTDR.jpg\"><img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"571\" src=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/What-Is-OTDR.jpg\" alt=\"OTDR l\u00e0 g\u00ec\" class=\"wp-image-3175\" srcset=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/What-Is-OTDR.jpg 800w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/What-Is-OTDR-300x214.jpg 300w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/What-Is-OTDR-768x548.jpg 768w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/What-Is-OTDR-600x428.jpg 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><figcaption class=\"wp-element-caption\">OTDR l\u00e0 g\u00ec<\/figcaption><\/figure>\n\n\n\n<p>V\u00ec th\u1ebf, <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em>? V\u1ec1 b\u1ea3n ch\u1ea5t, m\u1ed9t <em>M\u00e1y \u0111o OTDR<\/em>\u2014M\u00e1y \u0111o ph\u1ea3n x\u1ea1 mi\u1ec1n th\u1eddi gian quang h\u1ecdc\u2014l\u00e0 m\u1ed9t thi\u1ebft b\u1ecb chuy\u00ean d\u1ee5ng ph\u00e2n t\u00edch <a href=\"https:\/\/dekam-fiber.com\/adss-fiber-optic-cable\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00e1p quang<\/a> b\u1eb1ng c\u00e1ch g\u1eedi xung \u00e1nh s\u00e1ng qua ch\u00fang v\u00e0 \u0111o ph\u1ea3n x\u1ea1 tr\u1edf l\u1ea1i. N\u00f3 gi\u1ed1ng nh\u01b0 qu\u00e9t ch\u1ea9n \u0111o\u00e1n s\u1ee3i quang, cho th\u1ea5y \u00e1nh s\u00e1ng truy\u1ec1n t\u1ed1t nh\u01b0 th\u1ebf n\u00e0o qua kho\u1ea3ng c\u00e1ch\u2014cho d\u00f9 \u0111\u00f3 l\u00e0 x\u01b0\u01a1ng s\u1ed1ng vi\u1ec5n th\u00f4ng 100 km hay li\u00ean k\u1ebft trung t\u00e2m d\u1eef li\u1ec7u 500m. M\u1ed9t <em>M\u00e1y \u0111o OTDR<\/em> ho\u1ea1t \u0111\u1ed9ng v\u1edbi s\u1ee3i \u0111\u01a1n mode (v\u00ed d\u1ee5, <a href=\"https:\/\/commmesh.com\/vi\/g657a1-vs-g657a2-vs-g652d\/\" target=\"_blank\" rel=\"noreferrer noopener\">G652D<\/a> cho c\u00e1c ch\u1eb7ng \u0111\u01b0\u1eddng d\u00e0i) v\u00e0 s\u1ee3i \u0111a ch\u1ebf \u0111\u1ed9 (v\u00ed d\u1ee5: OM4 cho c\u00e1c kho\u1ea3ng c\u00e1ch ng\u1eafn), \u0111o c\u00e1c s\u1ed1 li\u1ec7u quan tr\u1ecdng nh\u01b0 suy gi\u1ea3m (v\u00ed d\u1ee5: 0,2 dB\/km), m\u1ea5t m\u00e1t m\u1ed1i n\u1ed1i (v\u00ed d\u1ee5: 0,1 dB) v\u00e0 l\u1ed7i (v\u00ed d\u1ee5: \u0111\u1ee9t \u1edf 15 km). V\u00ed d\u1ee5: m\u1ed9t k\u1ef9 thu\u1eadt vi\u00ean c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng <em>M\u00e1y \u0111o OTDR<\/em> \u0111\u1ec3 ki\u1ec3m tra s\u1ee3i quang \u0111\u01a1n mode d\u00e0i 20 km, ph\u00e1t hi\u1ec7n m\u1ed1i n\u1ed1i 0,3 dB \u1edf 8 km\u2014d\u1eef li\u1ec7u quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady c\u1ee7a m\u1ea1ng.<\/p>\n\n\n\n<p>V\u1ebb \u0111\u1eb9p c\u1ee7a <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em> n\u1eb1m \u1edf kh\u1ea3 n\u0103ng l\u1eadp b\u1ea3n \u0111\u1ed3 t\u00ecnh tr\u1ea1ng c\u1ee7a c\u00e1p tr\u00ean to\u00e0n b\u1ed9 chi\u1ec1u d\u00e0i c\u1ee7a n\u00f3. N\u00f3 g\u1eedi m\u1ed9t xung\u2014v\u00ed d\u1ee5, \u1edf 1310 nm\u2014v\u00e0 t\u00ednh th\u1eddi gian ph\u1ea3n x\u1ea1 m\u1ea5t bao l\u00e2u \u0111\u1ec3 tr\u1edf v\u1ec1 (v\u00ed d\u1ee5, 10 \u03bcs c\u00f3 ngh\u0129a l\u00e0 ~1 km trong s\u1ee3i quang), v\u1ebd \u0111\u1ed3 th\u1ecb c\u01b0\u1eddng \u0111\u1ed9 t\u00edn hi\u1ec7u so v\u1edbi kho\u1ea3ng c\u00e1ch tr\u00ean m\u1ed9t d\u1ea5u v\u1ebft. D\u1ea5u v\u1ebft n\u00e0y c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb m\u1ee9c m\u1ea5t \u1ed5n \u0111\u1ecbnh 0,2 dB\/km\u20144 dB tr\u00ean 20 km\u2014c\u1ed9ng v\u1edbi c\u00e1c s\u1ef1 ki\u1ec7n nh\u01b0 \u0111\u1ea7u n\u1ed1i 0,2 dB \u1edf 2 km ho\u1eb7c gi\u1ea3m ho\u00e0n to\u00e0n khi \u0111\u1ee9t. Cho d\u00f9 \u0111ang x\u00e1c minh c\u00e0i \u0111\u1eb7t m\u1edbi hay kh\u1eafc ph\u1ee5c s\u1ef1 c\u1ed1, m\u1ed9t <em>M\u00e1y \u0111o OTDR<\/em> cung c\u1ea5p nh\u1eefng hi\u1ec3u bi\u1ebft c\u1ea7n thi\u1ebft \u0111\u1ec3 duy tr\u00ec ho\u1ea1t \u0111\u1ed9ng t\u1ed1t nh\u1ea5t c\u1ee7a m\u1ea1ng c\u00e1p quang.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Ki\u1ec3m tra OTDR ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2>\n\n\n\n<p>Hi\u1ec3u bi\u1ebft <em>ki\u1ec3m tra OTDR l\u00e0 g\u00ec<\/em> b\u1eaft \u0111\u1ea7u v\u1edbi nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng c\u1ee7a n\u00f3: n\u00f3 s\u1eed d\u1ee5ng \u00e1nh s\u00e1ng \u0111\u1ec3 th\u0103m d\u00f2 c\u00e1p quang v\u00e0 gi\u1ea3i th\u00edch c\u00e1c t\u00edn hi\u1ec7u ph\u1ea3n h\u1ed3i \u0111\u1ec3 ki\u1ec3m tra t\u00ecnh tr\u1ea1ng s\u1ee9c kh\u1ecfe c\u1ee7a n\u00f3. M\u1ed9t <em>M\u00e1y \u0111o OTDR<\/em> ph\u00e1t m\u1ed9t xung ng\u1eafn\u2014v\u00ed d\u1ee5, r\u1ed9ng 10 ns\u2014v\u00e0o s\u1ee3i th\u00f4ng qua m\u1ed9t \u0111\u1ea7u n\u1ed1i nh\u01b0 <a href=\"https:\/\/commmesh.com\/vi\/product\/sc-apc-to-sc-apc\/\" target=\"_blank\" rel=\"noreferrer noopener\">SC\/APC<\/a>. Khi xung di chuy\u1ec3n, m\u1ed9t s\u1ed1 \u00e1nh s\u00e1ng b\u1ecb t\u00e1n x\u1ea1 tr\u1edf l\u1ea1i do c\u00e1c khuy\u1ebft t\u1eadt vi m\u00f4 (t\u00e1n x\u1ea1 Rayleigh), trong khi c\u00e1c s\u1ef1 ki\u1ec7n l\u1edbn h\u01a1n\u2014m\u1ed1i n\u1ed1i, \u0111\u1ea7u n\u1ed1i ho\u1eb7c \u0111\u1ee9t g\u00e3y\u2014ph\u1ea3n x\u1ea1 nhi\u1ec1u h\u01a1n (<a href=\"https:\/\/en.wikipedia.org\/wiki\/Fresnel_equations\" target=\"_blank\" rel=\"noreferrer noopener\">Ph\u1ea3n x\u1ea1 Fresnel<\/a>). C\u00e1c <em>M\u00e1y \u0111o OTDR<\/em> \u0111o th\u1eddi gian di\u1ec5n ra c\u00e1c ph\u1ea3n x\u1ea1 n\u00e0y\u2014v\u00ed d\u1ee5, 5 \u03bcs b\u1eb1ng 500m\u2014v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a ch\u00fang, t\u1ea1o ra m\u1ed9t d\u1ea5u v\u1ebft bi\u1ec3u th\u1ecb m\u1ee9c suy gi\u1ea3m (t\u00ednh b\u1eb1ng dB) so v\u1edbi kho\u1ea3ng c\u00e1ch.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5, trong th\u1eddi gian <em>Ki\u1ec3m tra OTDR<\/em> tr\u00ean s\u1ee3i quang 30 km, d\u1ea5u v\u1ebft c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb \u0111\u01b0\u1eddng c\u01a1 s\u1edf 0,2 dB\/km\u2014t\u1ed5ng c\u1ed9ng 6 dB\u2014v\u1edbi m\u1ed1i n\u1ed1i 0,15 dB \u1edf 10 km v\u00e0 \u0111\u1ee9t 2 dB \u1edf 25 km. \u0110\u1ed9 d\u1ed1c bi\u1ec3u th\u1ecb s\u1ef1 suy gi\u1ea3m, trong khi c\u00e1c \u0111i\u1ec3m \u0111\u1ed9t bi\u1ebfn ho\u1eb7c \u0111i\u1ec3m gi\u1ea3m \u0111\u00e1nh d\u1ea5u c\u00e1c s\u1ef1 ki\u1ec7n\u2014v\u00ed d\u1ee5, m\u1ea5t k\u1ebft n\u1ed1i 0,3 dB \u1edf 5 km ho\u1eb7c v\u00e1ch \u0111\u00e1 t\u1ea1i m\u1ed9t l\u1ed7i. C\u00e1c thi\u1ebft l\u1eadp c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh nh\u01b0 \u0111\u1ed9 r\u1ed9ng xung (v\u00ed d\u1ee5, 10 ns cho ph\u1ea1m vi ng\u1eafn, 1 \u03bcs cho ph\u1ea1m vi d\u00e0i) v\u00e0 ph\u1ea1m vi \u0111\u1ed9ng (v\u00ed d\u1ee5, 40 dB cho 200 km) x\u00e1c \u0111\u1ecbnh nh\u1eefng g\u00ec <em>Ki\u1ec3m tra OTDR<\/em> c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n\u2014c\u00e2n b\u1eb1ng chi ti\u1ebft v\u00e0 kho\u1ea3ng c\u00e1ch. Qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0m cho <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em> m\u1ed9t b\u01b0\u1edbc \u0111\u1ed9t ph\u00e1 trong ch\u1ea9n \u0111o\u00e1n.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1c th\u00e0nh ph\u1ea7n ch\u00ednh c\u1ee7a OTDR<\/h2>\n\n\n\n<p>M\u1ed8T <em>M\u00e1y \u0111o OTDR<\/em> l\u00e0 s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a c\u00e1c b\u1ed9 ph\u1eadn ch\u00ednh x\u00e1c\u2014sau \u0111\u00e2y l\u00e0 nh\u1eefng g\u00ec t\u1ea1o n\u00ean s\u1ee9c m\u1ea1nh c\u1ee7a n\u00f3.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ngu\u1ed3n Laser:<\/strong> Ph\u00e1t ra c\u00e1c xung \u00e1nh s\u00e1ng\u2014v\u00ed d\u1ee5, 1310 nm ho\u1eb7c 1550 nm\u2014\u1edf \u0111\u1ed9 r\u1ed9ng t\u1eeb 5 ns \u0111\u1ebfn 20 \u03bcs, t\u00f9y theo chi\u1ec1u d\u00e0i c\u00e1p\u2014v\u00ed d\u1ee5, 10 ns cho 1 km, 1 \u03bcs cho 50 km.<\/li>\n\n\n\n<li><strong>M\u00e1y d\u00f2 \u1ea3nh:<\/strong> Ph\u00e1t hi\u1ec7n \u00e1nh s\u00e1ng ph\u1ea3n x\u1ea1\u2014v\u00ed d\u1ee5, -50 dBm t\u1eeb m\u1ed1i n\u1ed1i \u1edf kho\u1ea3ng c\u00e1ch 8 km\u2014nh\u1ea1y c\u1ea3m v\u1edbi s\u1ef1 t\u00e1n x\u1ea1 y\u1ebfu (v\u00ed d\u1ee5, -70 dBm tr\u00ean 30 km).<\/li>\n\n\n\n<li><strong>B\u1ed9 gh\u00e9p n\u1ed1i\/B\u1ed9 chia:<\/strong> \u0110\u1ecbnh tuy\u1ebfn c\u00e1c xung \u0111i v\u00e0o s\u1ee3i quang v\u00e0 ph\u1ea3n x\u1ea1 \u0111\u1ebfn b\u1ed9 d\u00f2\u2014v\u00ed d\u1ee5, x\u1eed l\u00fd g\u1ecdn g\u00e0ng s\u1ef1 ki\u1ec7n k\u1ebft n\u1ed1i 0,2 dB.<\/li>\n\n\n\n<li><strong>M\u00e0n h\u00ecnh v\u00e0 B\u1ed9 x\u1eed l\u00fd:<\/strong> Hi\u1ec3n th\u1ecb d\u1ea5u v\u1ebft\u2014v\u00ed d\u1ee5, m\u1ed9t s\u01a1 \u0111\u1ed3 20 km v\u1edbi 0,2 dB\/km\u2014v\u00e0 ph\u00e2n t\u00edch n\u00f3\u2014v\u00ed d\u1ee5, t\u1ef1 \u0111\u1ed9ng ph\u00e1t hi\u1ec7n \u0111i\u1ec3m ng\u1eaft 1 dB \u1edf 15 km.<\/li>\n\n\n\n<li><strong>C\u1ed5ng:<\/strong> Th\u00f4ng th\u01b0\u1eddng l\u00e0 SC ho\u1eb7c LC\u2014v\u00ed d\u1ee5: SC\/APC cho ch\u1ebf \u0111\u1ed9 \u0111\u01a1n\u2014c\u1ed9ng v\u1edbi USB \u0111\u1ec3 l\u01b0u d\u1ea5u v\u1ebft (v\u00ed d\u1ee5: nh\u1eadt k\u00fd th\u1eed nghi\u1ec7m 25 km).<\/li>\n<\/ul>\n\n\n\n<p>Nh\u1eefng th\u00e0nh ph\u1ea7n n\u00e0y l\u00e0m cho <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em> m\u1ed9t th\u1ef1c t\u1ebf\u2014CommMesh <em>M\u00e1y \u0111o OTDR<\/em> c\u00e1c \u0111\u01a1n v\u1ecb c\u00f3 thi\u1ebft k\u1ebf \u0111\u00e1ng tin c\u1eady \u0111\u1ec3 c\u00f3 \u0111\u1ed9 ch\u00ednh x\u00e1c <em>Ki\u1ec3m tra OTDR<\/em>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-1.jpg\"><img decoding=\"async\" width=\"1000\" height=\"523\" src=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-1.jpg\" alt=\"otdr\" class=\"wp-image-3174\" srcset=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-1.jpg 1000w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-1-300x157.jpg 300w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-1-768x402.jpg 768w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-1-600x314.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/a><figcaption class=\"wp-element-caption\">otdr<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">T\u1ea1i sao ki\u1ec3m tra OTDR l\u1ea1i c\u1ea7n thi\u1ebft?<\/h2>\n\n\n\n<p><em>Ki\u1ec3m tra OTDR l\u00e0 g\u00ec<\/em> n\u1ebfu kh\u00f4ng ph\u1ea3i l\u00e0 ch\u00eca kh\u00f3a cho \u0111\u1ed9 tin c\u1eady c\u1ee7a c\u00e1p quang? N\u00f3 r\u1ea5t c\u1ea7n thi\u1ebft v\u00ec n\u00f3 cung c\u1ea5p d\u1eef li\u1ec7u chi ti\u1ebft, c\u1ee5 th\u1ec3 theo v\u1ecb tr\u00ed m\u00e0 c\u00e1c c\u00f4ng c\u1ee5 \u0111\u01a1n gi\u1ea3n h\u01a1n nh\u01b0 \u0111\u1ed3ng h\u1ed3 \u0111o \u0111i\u1ec7n kh\u00f4ng th\u1ec3 s\u00e1nh \u0111\u01b0\u1ee3c. Sau khi c\u00e0i \u0111\u1eb7t, <em>Ki\u1ec3m tra OTDR<\/em> x\u00e1c minh ch\u1ea5t l\u01b0\u1ee3ng\u2014v\u00ed d\u1ee5, m\u1ed9t li\u00ean k\u1ebft 25 km v\u1edbi 0,2 dB\/km (t\u1ed5ng c\u1ed9ng 5 dB) ph\u00f9 h\u1ee3p v\u1edbi th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt 10G (ng\u00e2n s\u00e1ch 17 dB)\u2014\u0111\u1ea3m b\u1ea3o c\u00e1c m\u1ed1i n\u1ed1i (v\u00ed d\u1ee5: 0,1 dB) v\u00e0 c\u00e1c \u0111\u1ea7u n\u1ed1i (v\u00ed d\u1ee5: 0,2 dB) kh\u00f4ng l\u00e0m \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00edn hi\u1ec7u. M\u1ed9t \u0111\u1ed3ng h\u1ed3 \u0111o c\u00f4ng su\u1ea5t c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb m\u1ee9c m\u1ea5t 4 dB tr\u00ean 20 km, nh\u01b0ng <em>M\u00e1y \u0111o OTDR<\/em> ti\u1ebft l\u1ed9 n\u01a1i n\u00e0o\u2014v\u00ed d\u1ee5, m\u1ed1i n\u1ed1i 0,5 dB \u1edf 12 km\u2014r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ea1ng l\u1edbn nh\u01b0 FTTH.<\/p>\n\n\n\n<p>T\u00ecm l\u1ed7i l\u00e0 n\u01a1i <em>Ki\u1ec3m tra OTDR<\/em> th\u1ef1c s\u1ef1 xu\u1ea5t s\u1eafc. M\u1ed9t s\u1ef1 gi\u00e1n \u0111o\u1ea1n 10 km v\u00e0o \u0111\u01b0\u1eddng d\u00e2y vi\u1ec5n th\u00f4ng 40 km xu\u1ea5t hi\u1ec7n nh\u01b0 m\u1ed9t s\u1ef1 s\u1ee5t gi\u1ea3m \u0111\u1ed9t ng\u1ed9t\u2014v\u00ed d\u1ee5, ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n \u1edf 10,3 km\u2014h\u01b0\u1edbng d\u1eabn s\u1eeda ch\u1eefa trong ph\u1ea1m vi m\u1ed9t m\u00e9t, trong khi m\u1ed9t s\u1ef1 u\u1ed1n cong 0,3 dB \u1edf 6 km t\u1eeb m\u1ed9t m\u1ed1i n\u1ed1i ch\u1eb7t ch\u1ebd \u0111\u01b0\u1ee3c ph\u00e1t hi\u1ec7n s\u1edbm\u2014v\u00ed d\u1ee5, ng\u0103n ch\u1eb7n s\u1ef1 c\u1ed1 m\u1ea5t \u0111i\u1ec7n c\u1ee7a trung t\u00e2m d\u1eef li\u1ec7u $15.000. \u0110\u1ed9 ch\u00ednh x\u00e1c n\u00e0y l\u00e0m cho <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em> kh\u00f4ng th\u1ec3 thi\u1ebfu cho vi\u1ec7c b\u1ea3o tr\u00ec v\u00e0 ho\u1ea1t \u0111\u1ed9ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u1ee8ng d\u1ee5ng c\u1ee7a OTDR trong c\u00e1p quang<\/h2>\n\n\n\n<p><em>Ki\u1ec3m tra OTDR<\/em> ph\u1ee5c v\u1ee5 nhi\u1ec1u nhu c\u1ea7u v\u1ec1 c\u00e1p quang. Trong vi\u1ec5n th\u00f4ng, n\u00f3 \u0111\u00e1nh gi\u00e1 c\u00e1c li\u00ean k\u1ebft \u0111\u01b0\u1eddng d\u00e0i\u2014v\u00ed d\u1ee5, m\u1ed9t x\u01b0\u01a1ng s\u1ed1ng 120 km v\u1edbi 0,2 dB\/km (t\u1ed5ng c\u1ed9ng 24 dB), x\u00e1c \u0111\u1ecbnh m\u1ed1i n\u1ed1i 0,15 dB \u1edf 60 km ho\u1eb7c \u0111\u1ee9t \u1edf 100 km\u2014\u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t 100G. Trong c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u, m\u1ed9t <em>M\u00e1y \u0111o OTDR<\/em> ki\u1ec3m tra c\u00e1c l\u1ea7n ch\u1ea1y ng\u1eafn\u2014v\u00ed d\u1ee5, li\u00ean k\u1ebft OM4 300m v\u1edbi m\u1ee9c m\u1ea5t m\u00e1t 0,4 dB\u2014ki\u1ec3m tra c\u00e1c \u0111\u1ea7u n\u1ed1i (v\u00ed d\u1ee5, c\u1eb7p LC 0,2 dB) cho l\u01b0u l\u01b0\u1ee3ng 40G. \u0110\u1ed1i v\u1edbi <a href=\"https:\/\/commmesh.com\/vi\/what-is-ftth\/\" target=\"_blank\" rel=\"noreferrer noopener\">FTTH<\/a>, n\u00f3 l\u1eadp b\u1ea3n \u0111\u1ed3 c\u00e1c \u0111i\u1ec3m gi\u1ea3m s\u00f3ng\u2014v\u00ed d\u1ee5, \u0111\u01b0\u1eddng li\u00ean k\u1ebft 15 km hi\u1ec3n th\u1ecb 0,2 dB\/km v\u00e0 \u0111i\u1ec3m n\u1ed1i 0,1 dB \u1edf 5 km\u2014x\u00e1c nh\u1eadn d\u1ecbch v\u1ee5 \u0111\u1ebfn nh\u00e0.<\/p>\n\n\n\n<p>X\u1eed l\u00fd s\u1ef1 c\u1ed1 l\u00e0 m\u1ed9t c\u00e1ch s\u1eed d\u1ee5ng quan tr\u1ecdng kh\u00e1c\u2014v\u00ed d\u1ee5, m\u1ed9t \u0111\u01b0\u1eddng li\u00ean k\u1ebft n\u00f4ng th\u00f4n d\u00e0i 30 km v\u1edbi l\u1ed7i 1,5 dB c\u00e1ch c\u00e2y \u0111\u1ed5 25 km ho\u1eb7c m\u1ed9t \u0111\u01b0\u1eddng ch\u1ea1y trong khu\u00f4n vi\u00ean tr\u01b0\u1eddng d\u00e0i 5 km v\u1edbi \u0111\u1ed9 cong 0,4 dB c\u00e1ch \u1ed1ng d\u1eabn b\u1ecb \u0111\u00e8 b\u1eb9p 3 km\u2014x\u00e1c \u0111\u1ecbnh ch\u00ednh x\u00e1c vi\u1ec7c s\u1eeda ch\u1eefa nhanh ch\u00f3ng. Ch\u1ee9ng nh\u1eadn c\u0169ng d\u1ef1a v\u00e0o <em>M\u00e1y \u0111o OTDR<\/em>\u2014v\u00ed d\u1ee5, ghi l\u1ea1i m\u1ee9c suy gi\u1ea3m 2 dB c\u1ee7a li\u00ean k\u1ebft d\u00e0i 10 km \u0111\u1ec3 tu\u00e2n th\u1ee7\u2014l\u00e0m <em>OTDR trong s\u1ee3i quang l\u00e0 g\u00ec<\/em> m\u1ed9t nhu c\u1ea7u \u0111a d\u1ea1ng.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/fiber-testing-otdr.jpg\"><img decoding=\"async\" width=\"1024\" height=\"494\" src=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/fiber-testing-otdr.jpg\" alt=\"ki\u1ec3m tra s\u1ee3i otdr\" class=\"wp-image-3172\" srcset=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/fiber-testing-otdr.jpg 1024w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/fiber-testing-otdr-300x145.jpg 300w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/fiber-testing-otdr-768x371.jpg 768w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/fiber-testing-otdr-600x289.jpg 600w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/a><figcaption class=\"wp-element-caption\">ki\u1ec3m tra s\u1ee3i otdr<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">C\u00e1ch th\u1ef1c hi\u1ec7n ki\u1ec3m tra OTDR<\/h2>\n\n\n\n<p>Th\u1ef1c hi\u1ec7n <em>Ki\u1ec3m tra OTDR<\/em> tu\u00e2n theo m\u1ed9t quy tr\u00ecnh r\u00f5 r\u00e0ng\u2014sau \u0111\u00e2y l\u00e0 n\u1ed9i dung ph\u00e2n t\u00edch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Thi\u1ebft l\u1eadp \u0111\u1ec3 ki\u1ec3m tra OTDR<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>K\u1ebft n\u1ed1i: Li\u00ean k\u1ebft <em>M\u00e1y \u0111o OTDR<\/em> \u0111\u1ebfn s\u1ee3i quang th\u00f4ng qua SC\/APC\u2014v\u00ed d\u1ee5, s\u1eed d\u1ee5ng c\u00e1p kh\u1edfi ch\u1ea1y d\u00e0i 1 km cho li\u00ean k\u1ebft d\u00e0i 25 km \u0111\u1ec3 b\u1ecf qua v\u00f9ng ch\u1ebft.<\/li>\n\n\n\n<li>C\u1ea5u h\u00ecnh: \u0110\u1eb7t b\u01b0\u1edbc s\u00f3ng (v\u00ed d\u1ee5: 1550 nm), \u0111\u1ed9 r\u1ed9ng xung (v\u00ed d\u1ee5: 10 ns cho 1 km, 1 \u03bcs cho 50 km) v\u00e0 ph\u1ea1m vi (v\u00ed d\u1ee5: 30 km)\u2014v\u00ed d\u1ee5: chu\u1ea9n b\u1ecb cho th\u1eed nghi\u1ec7m 20 km.<\/li>\n\n\n\n<li>Hi\u1ec7u ch\u1ec9nh: \u0110\u1eb7t v\u1ec1 s\u1ed1 0 <em>M\u00e1y \u0111o OTDR<\/em>\u2014v\u00ed d\u1ee5, \u0111\u1ea3m b\u1ea3o kh\u1edfi \u0111\u1ed9ng an to\u00e0n \u1edf km th\u1ee9 0\u2014m\u1ea5t 5-10 ph\u00fat.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Ch\u1ea1y th\u1eed nghi\u1ec7m OTDR<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kh\u1edfi ch\u1ea1y: B\u1eaft \u0111\u1ea7u qu\u00e9t\u2014v\u00ed d\u1ee5, th\u1eed nghi\u1ec7m 30 km m\u1ea5t 1-2 ph\u00fat, hi\u1ec3n th\u1ecb 0,2 dB\/km v\u00e0 m\u1ed1i n\u1ed1i 0,3 dB \u1edf 12 km.<\/li>\n\n\n\n<li>Ph\u00e2n t\u00edch: Ki\u1ec3m tra d\u1ea5u v\u1ebft\u2014v\u00ed d\u1ee5, m\u1ee9c gi\u1ea3m 2 dB \u1edf 28 km b\u00e1o hi\u1ec7u s\u1ef1 c\u1ed1; \u0111i\u1ec1u ch\u1ec9nh m\u1ee9c trung b\u00ecnh (v\u00ed d\u1ee5: 30 gi\u00e2y) \u0111\u1ec3 r\u00f5 r\u00e0ng h\u01a1n khi ch\u1ea1y 60 km.<\/li>\n\n\n\n<li>L\u01b0u: Xu\u1ea5t k\u1ebft qu\u1ea3\u2014v\u00ed d\u1ee5: \u201c30 km, 6 dB, 2 m\u1ed1i n\u1ed1i\u201d qua USB\u2014t\u1ed5ng th\u1eddi gian 15-30 ph\u00fat.<\/li>\n<\/ul>\n\n\n\n<p>CommMesh c\u1ee7a <em>M\u00e1y \u0111o OTDR<\/em> thi\u1ebft b\u1ecb t\u1ea1i CommMesh \u0111\u01a1n gi\u1ea3n h\u00f3a <em>Ki\u1ec3m tra OTDR<\/em>\u2014c\u00f4ng c\u1ee5 \u0111\u00e1ng tin c\u1eady cho k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hi\u1ec3u k\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m OTDR<\/h2>\n\n\n\n<p>\u0110\u1ecdc <em>ki\u1ec3m tra OTDR l\u00e0 g\u00ec<\/em> k\u1ebft qu\u1ea3 l\u00e0 r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 h\u00e0nh \u0111\u1ed9ng. M\u1ed9t d\u1ea5u v\u1ebft 20 km c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb 0,2 dB\/km\u2014t\u1ed5ng c\u1ed9ng l\u00e0 4 dB\u2014c\u1ed9ng v\u1edbi 0,2 dB cho m\u1ed7i \u0111\u1ea7u n\u1ed1i (hai c\u1eb7p, 0,4 dB), t\u1ed5ng c\u1ed9ng l\u00e0 4,4 dB\u2014an to\u00e0n cho ng\u00e2n s\u00e1ch 10G (17 dB). M\u1ed9t \u0111\u1ed9t bi\u1ebfn 1 dB \u1edf 8 km b\u00e1o hi\u1ec7u m\u1ed1i n\u1ed1i x\u1ea5u\u2014v\u00ed d\u1ee5, s\u1ee3i quang kh\u00f4ng th\u1eb3ng h\u00e0ng c\u1ea7n \u0111\u01b0\u1ee3c l\u00e0m l\u1ea1i\u2014trong khi ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n \u1edf 15 km ch\u1ec9 ra m\u1ed9t s\u1ef1 \u0111\u1ee9t g\u00e3y\u2014v\u00ed d\u1ee5, m\u1ed9t v\u1ebft c\u1eaft do \u0111\u00e0o. M\u1ed9t d\u1ecb th\u01b0\u1eddng 0,5 dB \u1edf 5 km c\u00f3 th\u1ec3 c\u00f3 ngh\u0129a l\u00e0 m\u1ed9t s\u1ef1 u\u1ed1n cong\u2014v\u00ed d\u1ee5, t\u1eeb m\u1ed9t \u1ed1ng d\u1eabn ch\u1eb7t\u2014c\u1ea7n s\u1eeda ch\u1eefa.<\/p>\n\n\n\n<p>X\u1eed l\u00fd s\u1ef1 c\u1ed1 d\u1ef1a tr\u00ean \u0111i\u1ec1u n\u00e0y\u2014v\u00ed d\u1ee5, gi\u1ea3m 2 dB \u1edf 25 km tr\u00ean li\u00ean k\u1ebft 40 km (ph\u1ea3n x\u1ea1 to\u00e0n ph\u1ea7n) x\u00e1c \u0111\u1ecbnh m\u1ed9t ph\u1ea7n b\u1ecb \u0111\u1ee9t ho\u1eb7c m\u1ed1i n\u1ed1i 0,3 dB \u1edf 10 km \u0111\u01b0\u1ee3c tinh ch\u1ec9nh th\u00e0nh 0,1 dB\u2014v\u00ed d\u1ee5, t\u0103ng bi\u00ean \u0111\u1ed9 c\u1ee7a li\u00ean k\u1ebft 40G. Trong tr\u01b0\u1eddng h\u1ee3p vi\u1ec5n th\u00f4ng, m\u1ea5t 1 dB \u1edf 50 km tr\u00ean \u0111\u01b0\u1eddng ch\u1ea1y 100 km\u2014\u0111\u01b0\u1ee3c theo d\u00f5i \u0111\u1ebfn m\u1ed9t \u0111i\u1ec3m b\u1ecb nghi\u1ec1n n\u00e1t\u2014h\u01b0\u1edbng d\u1eabn m\u1ed9t b\u1ea3n v\u00e1 $50. <em>Ki\u1ec3m tra OTDR<\/em> bi\u1ebfn d\u1eef li\u1ec7u th\u00e0nh gi\u1ea3i ph\u00e1p.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-fiber-testing.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1000\" height=\"667\" src=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-fiber-testing.jpg\" alt=\"ki\u1ec3m tra s\u1ee3i quang otdr\" class=\"wp-image-3173\" srcset=\"https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-fiber-testing.jpg 1000w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-fiber-testing-300x200.jpg 300w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-fiber-testing-768x512.jpg 768w, https:\/\/commmesh.com\/wp-content\/uploads\/2025\/03\/otdr-fiber-testing-600x400.jpg 600w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/a><figcaption class=\"wp-element-caption\">ki\u1ec3m tra s\u1ee3i quang otdr<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Gi\u00e1 OTDR: Nh\u1eefng \u0111i\u1ec1u c\u1ea7n mong \u0111\u1ee3i<\/h2>\n\n\n\n<p><em>M\u00e1y \u0111o OTDR<\/em> gi\u00e1 c\u1ea3 thay \u0111\u1ed5i r\u1ea5t nhi\u1ec1u t\u00f9y theo t\u00ednh n\u0103ng v\u00e0 kh\u1ea3 n\u0103ng\u2014sau \u0111\u00e2y l\u00e0 b\u1ea3ng ph\u00e2n t\u00edch.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Chi ph\u00ed OTDR c\u1ea5p \u0111\u1ea7u v\u00e0o<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ph\u1ea1m vi:<\/strong> $1000-$3000\u2014v\u00ed d\u1ee5, c\u00e1c m\u1eabu c\u01a1 b\u1ea3n c\u00f3 d\u1ea3i \u0111\u1ed9ng 30 dB, ph\u00f9 h\u1ee3p v\u1edbi ph\u1ea1m vi 50-100 km \u1edf m\u1ee9c 0,2 dB\/km.<\/li>\n\n\n\n<li><strong>Chi ti\u1ebft:<\/strong> T\u1ed1t cho c\u00e1c \u0111\u01b0\u1eddng truy\u1ec1n ng\u1eafn\u2014v\u00ed d\u1ee5, \u0111\u01b0\u1eddng truy\u1ec1n FTTH c\u00e1ch xa 5 km\u2014ho\u1eb7c c\u00e1c m\u1ea1ng nh\u1ecf, cung c\u1ea5p xung 1310\/1550 nm v\u00e0 10 ns\u2014v\u00ed d\u1ee5, ph\u00e1t hi\u1ec7n m\u1ed1i n\u1ed1i 0,2 dB \u1edf kho\u1ea3ng c\u00e1ch 3 km. \u0110\u1ed9 ph\u00e2n gi\u1ea3i h\u1ea1n ch\u1ebf\u2014v\u00ed d\u1ee5, v\u00f9ng ch\u1ebft 5m\u2014b\u1ecf qua c\u00e1c l\u1ed7i g\u1ea7n cu\u1ed1i.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Gi\u00e1 OTDR t\u1ea7m trung<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ph\u1ea1m vi:<\/strong> $3000-$8000\u2014v\u00ed d\u1ee5, ph\u1ea1m vi 40 dB trong 200 km, l\u00fd t\u01b0\u1edfng cho li\u00ean k\u1ebft vi\u1ec5n th\u00f4ng ho\u1eb7c tr\u01b0\u1eddng h\u1ecdc.<\/li>\n\n\n\n<li><strong>Chi ti\u1ebft:<\/strong> C\u00e2n b\u1eb1ng chi ph\u00ed v\u00e0 c\u00f4ng su\u1ea5t\u2014v\u00ed d\u1ee5, $5000 <em>M\u00e1y \u0111o OTDR<\/em> ki\u1ec3m tra s\u1ee3i quang d\u00e0i 30 km, cho th\u1ea5y m\u1ed1i n\u1ed1i 0,15 dB v\u00e0 \u0111\u1ee9t 2 dB v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c \u00b11 m. C\u00e1c t\u00ednh n\u0103ng nh\u01b0 ph\u00e2n t\u00edch t\u1ef1 \u0111\u1ed9ng\u2014v\u00ed d\u1ee5, \u0111\u00e1nh d\u1ea5u \u0111\u1ed9 cong 0,3 dB \u1edf 10 km\u2014ph\u00f9 h\u1ee3p v\u1edbi h\u1ea7u h\u1ebft c\u00e1c chuy\u00ean gia.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Chi ph\u00ed OTDR cao c\u1ea5p<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ph\u1ea1m vi:<\/strong> $8000-$20.000\u2014v\u00ed d\u1ee5, ph\u1ea1m vi 45-50 dB cho 250 km tr\u1edf l\u00ean, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c m\u1ea1ng \u0111\u01b0\u1eddng d\u00e0i ho\u1eb7c quan tr\u1ecdng.<\/li>\n\n\n\n<li><strong>Chi ti\u1ebft:<\/strong> C\u00e1c t\u00f9y ch\u1ecdn n\u00e2ng cao\u2014v\u00ed d\u1ee5, m\u1ed9t \u0111\u01a1n v\u1ecb $15.000 qu\u00e9t m\u1ed9t x\u01b0\u01a1ng s\u1ed1ng d\u00e0i 150 km, ph\u00e1t hi\u1ec7n c\u00e1c m\u1ed1i n\u1ed1i 0,05 dB \u1edf 100 km v\u1edbi \u0111\u1ed9 ph\u00e2n gi\u1ea3i 1m\u2014c\u1ed9ng v\u1edbi c\u00e1c t\u00ednh n\u0103ng b\u1ed5 sung nh\u01b0 m\u00e0n h\u00ecnh c\u1ea3m \u1ee9ng ho\u1eb7c \u0111a b\u01b0\u1edbc s\u00f3ng (1625 nm \u0111\u1ec3 th\u1eed nghi\u1ec7m tr\u1ef1c ti\u1ebfp). \u0110\u00e1ng gi\u00e1 cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng quy m\u00f4 l\u1edbn\u2014v\u00ed d\u1ee5, l\u1ed7i 1 dB \u1edf 120 km.<\/li>\n<\/ul>\n\n\n\n<p>CommMesh cung c\u1ea5p <em>M\u00e1y \u0111o OTDR<\/em> c\u00e1c m\u00f4 h\u00ecnh tr\u00ean c\u00e1c t\u1ea7ng n\u00e0y\u2014c\u00e1c c\u00f4ng c\u1ee5 h\u01b0\u1edbng \u0111\u1ebfn gi\u00e1 tr\u1ecb cho <em>Ki\u1ec3m tra OTDR<\/em>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nh\u1eefng th\u00e1ch th\u1ee9c trong th\u1eed nghi\u1ec7m OTDR<\/h2>\n\n\n\n<p><em>Ki\u1ec3m tra OTDR<\/em> kh\u00f4ng ho\u00e0n h\u1ea3o\u2014sau \u0111\u00e2y l\u00e0 nh\u1eefng r\u00e0o c\u1ea3n ph\u1ed5 bi\u1ebfn. V\u00f9ng ch\u1ebft\u2014v\u00ed d\u1ee5, 10m tr\u00ean m\u1ed9t \u0111\u01a1n v\u1ecb $2000\u2014\u1ea9n c\u00e1c l\u1ed7i g\u1ea7n \u0111\u1ea7u\u2014v\u00ed d\u1ee5, m\u1ed9t \u0111\u1ea7u n\u1ed1i 0,2 dB \u1edf 5m\u2014c\u1ea7n c\u00e1p ph\u00f3ng 500m \u0111\u1ec3 gi\u1ea3i quy\u1ebft. Ti\u1ebfng \u1ed3n t\u1ea7m xa\u2014v\u00ed d\u1ee5, 35 dB <em>M\u00e1y \u0111o OTDR<\/em> v\u1eadt l\u1ed9n qua 150 km\u2014che c\u00e1c s\u1ef1 ki\u1ec7n m\u1edd nh\u1ea1t\u2014v\u00ed d\u1ee5, m\u1ed1i n\u1ed1i 0,1 dB \u1edf 160 km\u2014\u0111\u01b0\u1ee3c c\u1ed1 \u0111\u1ecbnh b\u1eb1ng c\u00e1c \u0111\u01a1n v\u1ecb cao c\u1ea5p h\u01a1n (45 dB). C\u00e1c \u0111\u1ea7u n\u1ed1i b\u1ea9n l\u00e0m t\u0103ng th\u00eam t\u1ed5n th\u1ea5t gi\u1ea3\u2014v\u00ed d\u1ee5, 0,5 dB t\u1eeb b\u1ee5i\u2014c\u1ea7n ph\u1ea3i lau $10.<\/p>\n\n\n\n<p>Vi\u1ec7c gi\u1ea3i th\u00edch c\u00f3 th\u1ec3 \u0111\u00e1nh l\u1eeba ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u\u2014v\u00ed d\u1ee5, ph\u1ea3n x\u1ea1 b\u00f3ng ma 0,3 dB \u1edf kho\u1ea3ng c\u00e1ch 20 km tr\u00ean \u0111\u01b0\u1eddng li\u00ean k\u1ebft 10 km c\u00f3 th\u1ec3 g\u00e2y nh\u1ea7m l\u1eabn cho ng\u01b0\u1eddi d\u00f9ng m\u1edbi\u2014kinh nghi\u1ec7m ho\u1eb7c \u0111\u00e0o t\u1ea1o s\u1ebd gi\u00fap \u00edch.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho th\u1eed nghi\u1ec7m OTDR<\/h2>\n\n\n\n<p>Ki\u1ec3m tra tr\u01b0\u1edbc, l\u00e0m s\u1ea1ch c\u00e1c \u0111\u1ea7u n\u1ed1i\u2014v\u00ed d\u1ee5, b\u1ed9 $50 tr\u00e1nh \u0111\u01b0\u1ee3c t\u1ed5n th\u1ea5t 0,3 dB do b\u1ee5i b\u1ea9n\u2014\u0111\u1eb7t \u0111\u1ed9 r\u1ed9ng xung ph\u1ea3i\u2014v\u00ed d\u1ee5, 10 ns cho 1 km, 1 \u03bcs cho 50 km\u2014v\u00e0 s\u1eed d\u1ee5ng c\u00e1p kh\u1edfi ch\u1ea1y\u2014v\u00ed d\u1ee5, 1 km cho li\u00ean k\u1ebft 30 km\u2014\u0111\u1ec3 xem \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u. Ki\u1ec3m tra s\u1ee3i quang 5 km \u0111\u00e3 bi\u1ebft\u2014v\u00ed d\u1ee5, t\u1ed5n th\u1ea5t 1 dB\u2014\u0111\u1ec3 x\u00e1c nh\u1eadn c\u00e0i \u0111\u1eb7t.<\/p>\n\n\n\n<p>Ki\u1ec3m tra sau, qu\u00e9t trung b\u00ecnh\u2014v\u00ed d\u1ee5, 30 gi\u00e2y khi ch\u1ea1y 40 km\u2014\u0111\u1ec3 r\u00f5 r\u00e0ng h\u01a1n, ki\u1ec3m tra ch\u00e9o b\u1eb1ng m\u00e1y \u0111o c\u00f4ng su\u1ea5t\u2014v\u00ed d\u1ee5, t\u1ed5ng s\u1ed1 6 dB kh\u1edbp v\u1edbi OTDR\u2014v\u00e0 l\u01b0u d\u1ea5u v\u1ebft\u2014v\u00ed d\u1ee5, \u201c20 km, 4 dB, 3 m\u1ed1i n\u1ed1i\u201d\u2014ph\u00e1t hi\u1ec7n m\u1ed1i n\u1ed1i 0,2 dB b\u1ecb thi\u1ebfu sau \u0111\u00f3. Truy\u1ec1n \u0111\u1ed9ng ch\u00ednh x\u00e1c <em>Ki\u1ec3m tra OTDR<\/em> th\u00e0nh c\u00f4ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">K\u1ebft lu\u1eadn: M\u1edf kh\u00f3a OTDR trong s\u1ee3i quang<\/h2>\n\n\n\n<p><em>OTDR trong c\u00e1p quang l\u00e0 g\u00ec<\/em>? \u0110\u00f3 l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 hi\u1ec3u v\u00e0 duy tr\u00ec m\u1ea1ng l\u01b0\u1edbi c\u00e1p quang, ti\u1ebft l\u1ed9 m\u1ecdi chi ti\u1ebft b\u1eb1ng \u00e1nh s\u00e1ng v\u00e0 th\u1eddi gian\u2014gi\u1ed1ng nh\u01b0 m\u1ed9t chi\u1ebfc \u0111\u00e8n l\u1ed3ng chi\u1ebfu s\u00e1ng con \u0111\u01b0\u1eddng t\u1ed1i t\u0103m. H\u01b0\u1edbng d\u1eabn n\u00e0y \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn <em>ki\u1ec3m tra OTDR l\u00e0 g\u00ec<\/em>\u2014c\u01a1 ch\u1ebf, c\u00f4ng d\u1ee5ng, gi\u00e1 c\u1ea3 v\u00e0 m\u1eb9o c\u1ee7a n\u00f3\u2014cho th\u1ea5y l\u00fd do t\u1ea1i sao n\u00f3 l\u00e0 thi\u1ebft b\u1ecb b\u1eaft bu\u1ed9c ph\u1ea3i c\u00f3 \u0111\u1ed1i v\u1edbi c\u00e1c chuy\u00ean gia v\u1ec1 s\u1ee3i quang. T\u1eeb m\u1ed9t \u0111\u01a1n v\u1ecb $1000 cho c\u00e1c c\u00f4ng vi\u1ec7c nh\u1ecf \u0111\u1ebfn m\u1ed9t nh\u00e0 m\u00e1y \u0111i\u1ec7n $15.000 cho \u0111\u01b0\u1eddng d\u00e0i, CommMesh cung c\u1ea5p <em>M\u00e1y \u0111o OTDR<\/em> thi\u1ebft b\u1ecb ph\u00f9 h\u1ee3p v\u1edbi nhu c\u1ea7u c\u1ee7a b\u1ea1n. \u00d4m \u1ea5p <em>Ki\u1ec3m tra OTDR<\/em> v\u00e0 duy tr\u00ec m\u1ea1ng l\u01b0\u1edbi c\u00e1p quang c\u1ee7a b\u1ea1n lu\u00f4n ph\u00e1t tri\u1ec3n!<\/p>","protected":false},"excerpt":{"rendered":"<p>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng OTDR nh\u01b0 m\u1ed9t th\u00e1m t\u1eed tinh m\u1eaft c\u1ee7a m\u1ea1ng c\u00e1p quang\u2014m\u1ed9t c\u00f4ng c\u1ee5 kh\u00e1m ph\u00e1 c\u00e1c chi ti\u1ebft \u1ea9n c\u1ee7a c\u00e1p truy\u1ec1n d\u1eef li\u1ec7u qua kho\u1ea3ng c\u00e1ch xa, gi\u1ed1ng nh\u01b0 m\u1ed9t th\u00e1m t\u1eed gh\u00e9p c\u00e1c manh m\u1ed1i l\u1ea1i v\u1edbi nhau. \u0110\u01b0\u1ee3c g\u1ecdi l\u00e0 M\u00e1y \u0111o ph\u1ea3n x\u1ea1 mi\u1ec1n th\u1eddi gian quang h\u1ecdc, OTDR l\u00e0 thi\u1ebft b\u1ecb c\u1ea7n thi\u1ebft cho b\u1ea5t k\u1ef3 ai l\u00e0m vi\u1ec7c v\u1edbi c\u00e1p quang, t\u1eeb k\u1ef9 s\u01b0 vi\u1ec5n th\u00f4ng \u0111\u1ebfn k\u1ef9 thu\u1eadt vi\u00ean trung t\u00e2m d\u1eef li\u1ec7u. N\u1ebfu [\u2026]<\/p>","protected":false},"author":1,"featured_media":3127,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"none","_seopress_titles_title":"What Is OTDR: A Comprehensive Overview - CommMesh","_seopress_titles_desc":"","_seopress_robots_index":"","footnotes":""},"categories":[34],"tags":[],"class_list":["post-3129","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\/3129","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=3129"}],"version-history":[{"count":10,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/3129\/revisions"}],"predecessor-version":[{"id":3292,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/posts\/3129\/revisions\/3292"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/media\/3127"}],"wp:attachment":[{"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/media?parent=3129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/categories?post=3129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/commmesh.com\/vi\/wp-json\/wp\/v2\/tags?post=3129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}