{"id":3955,"date":"2025-09-29T11:12:00","date_gmt":"2025-09-29T11:12:00","guid":{"rendered":"https:\/\/lp.szlogic.cn\/glossary\/optical-modulation-amplitude-oma-in-sfp-modules\/"},"modified":"2026-06-22T06:36:10","modified_gmt":"2026-06-22T06:36:10","slug":"optical-modulation-amplitude-oma-in-sfp-modules","status":"publish","type":"post","link":"https:\/\/resourceslp.szlogic.cn\/vi\/glossary\/optical-modulation-amplitude-oma-in-sfp-modules","title":{"rendered":"OMA (Bi\u00ean \u0111\u1ed9 \u0110i\u1ec1u ch\u1ebf Quang) trong B\u1ed9 thu ph\u00e1t Quang"},"content":{"rendered":"
\"OMA<\/figure>\n\n\n\n

\u2705 <\/strong>Gi\u1edbi thi\u1ec7u<\/h2>\n\n\n\n

Trong truy\u1ec1n th\u00f4ng s\u1ee3i quang, c\u00e1c nh\u00e0 thi\u1ebft k\u1ebf v\u00e0 k\u1ef9 s\u01b0 h\u1ec7 th\u1ed1ng ph\u1ea3i \u0111\u1ed1i m\u1eb7t v\u1edbi nhi\u1ec1u th\u00f4ng s\u1ed1 hi\u1ec7u n\u0103ng\u2014c\u00f4ng su\u1ea5t quang, t\u1ef7 s\u1ed1 t\u1eaft m\u1edf, \u0111\u1ed9 nh\u1ea1y b\u1ed9 thu, \u0111\u1ed9 ch\u1ec7ch th\u1eddi gian (jitter), v.v. Trong s\u1ed1 \u0111\u00f3, Bi\u00ean \u0111\u1ed9 \u0110i\u1ec1u ch\u1ebf Quang (OMA)<\/strong> l\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 ch\u1ea5t l\u01b0\u1ee3ng tr\u1ecdng t\u00e2m cho c\u00e1c s\u01a1 \u0111\u1ed3 \u0111i\u1ec1u ch\u1ebf s\u1ed1 (b\u1eadt-t\u1eaft). B\u00e0i vi\u1ebft n\u00e0y gi\u1ea3i th\u00edch OMA t\u1eeb nh\u1eefng nguy\u00ean l\u00fd c\u01a1 b\u1ea3n nh\u1ea5t, tr\u00ecnh b\u00e0y c\u00e1ch t\u00ednh to\u00e1n n\u00f3, li\u00ean h\u1ec7 n\u00f3 v\u1edbi c\u00e1c th\u00f4ng s\u1ed1 kh\u00e1c nh\u01b0 t\u1ef7 s\u1ed1 t\u1eaft m\u1edf, v\u00e0 th\u1ea3o lu\u1eadn vai tr\u00f2 c\u1ee7a n\u00f3 trong th\u1ef1c t\u1ebf b\u1ed9 thu ph\u00e1t quang<\/a> (v\u00ed d\u1ee5:, c\u00e1c m\u00f4-\u0111un SFP LINK-PP<\/a>).<\/p>\n\n\n\n

\u2705 <\/strong>OMA (Bi\u00ean \u0111\u1ed9 \u0110i\u1ec1u ch\u1ebf Quang) L\u00e0 G\u00ec?<\/h2>\n\n\n\n
    \n

  1. \u0110\u1ecbnh ngh\u0129a
    <\/strong>
    OMA \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a l\u00e0 s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa c\u00f4ng su\u1ea5t quang t\u01b0\u01a1ng \u1ee9ng v\u1edbi m\u1ee9c logic \u201c1\u201d (P\u2081) v\u00e0 m\u1ee9c logic \u201c0\u201d (P\u2080):<\/p><\/li>\n<\/ol>\n\n\n\n

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

    trong \u0111\u00f3 c\u1ea3 P\u2081 v\u00e0 P\u2080 \u0111\u1ec1u l\u00e0 c\u00e1c m\u1ee9c c\u00f4ng su\u1ea5t trung b\u00ecnh (t\u00ednh b\u1eb1ng watt ho\u1eb7c milliwatt) trong tr\u1ea1ng th\u00e1i \u201cb\u1eadt\u201d v\u00e0 \u201ct\u1eaft\u201d, t\u01b0\u01a1ng \u1ee9ng. <\/p>\n<\/blockquote>\n\n\n\n

      \n

    1. Di\u1ec5n gi\u1ea3i<\/strong>Trong th\u1ef1c t\u1ebf, OMA cho bi\u1ebft bi\u00ean \u0111\u1ed9 quang h\u1eefu d\u1ee5ng hi\u1ec7u qu\u1ea3<\/em> \u0111\u1ec3 truy\u1ec1n t\u00edn hi\u1ec7u. N\u1ebfu P\u2081 v\u00e0 P\u2080 qu\u00e1 g\u1ea7n nhau, b\u1ed9 thu c\u00f3 th\u1ec3 kh\u00f4ng ph\u00e2n bi\u1ec7t \u0111\u00e1ng tin c\u1eady gi\u1eefa \u201c1\u201d v\u00e0 \u201c0\u201d. M\u1ed9t gi\u00e1 tr\u1ecb OMA cao h\u01a1n th\u01b0\u1eddng d\u1eabn \u0111\u1ebfn x\u00e1c su\u1ea5t l\u1ed7i bit (BER) th\u1ea5p h\u01a1n T\u1ef7 l\u1ec7 l\u1ed7i bit (BER)<\/a>, gi\u1ea3 s\u1eed nhi\u1ec5u v\u00e0 m\u00e9o d\u1ea1ng \u0111\u01b0\u1ee3c gi\u1eef kh\u00f4ng \u0111\u1ed5i.<\/p><\/li>

    2. Gi\u00e1 tr\u1ecb \u0111\u1ec9nh-\u0111\u1ec9nh so v\u1edbi gi\u00e1 tr\u1ecb trung b\u00ecnh<\/strong>OMA<\/strong> th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb d\u01b0\u1edbi d\u1ea1ng gi\u00e1 tr\u1ecb \u0111\u1ec9nh-\u0111\u1ec9nh<\/em> , \u0111\u1eb7c bi\u1ec7t khi \u0111o t\u1eeb bi\u1ec3u \u0111\u1ed3 m\u1eaft (s\u1ef1 ch\u00eanh l\u1ec7ch gi\u1eefa m\u1ee9c bi\u00ean \u0111\u1ed9 quang tr\u00ean c\u00f9ng v\u00e0 d\u01b0\u1edbi c\u00f9ng).<\/p><\/li>\n<\/ol>\n\n\n\n

      \u2705 <\/strong>M\u1ed1i quan h\u1ec7 v\u1edbi C\u00f4ng su\u1ea5t Trung b\u00ecnh v\u00e0 T\u1ef7 s\u1ed1 T\u1eaft M\u1edf<\/h2>\n\n\n\n

      OMA kh\u00f4ng t\u1ed3n t\u1ea1i \u0111\u1ed9c l\u1eadp. Hai th\u00f4ng s\u1ed1 b\u1ed5 tr\u1ee3 ph\u1ed5 bi\u1ebfn l\u00e0:<\/p>\n\n\n\n