{"id":367,"date":"2020-09-20T12:43:22","date_gmt":"2020-09-20T04:43:22","guid":{"rendered":"http:\/\/www.xzclass.com\/?p=367"},"modified":"2022-02-28T15:16:13","modified_gmt":"2022-02-28T07:16:13","slug":"%e3%80%90%e6%bc%ab%e7%94%bb%e7%a7%91%e6%99%ae%e3%80%91%e4%bb%80%e4%b9%88%e6%98%afpam4","status":"publish","type":"post","link":"http:\/\/www.xzclass.com\/?p=367","title":{"rendered":"\u3010\u6f2b\u753b\u79d1\u666e\u3011\u4ec0\u4e48\u662fPAM4"},"content":{"rendered":"
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PAM4\uff0c\u5c31\u662f4-Level Pulse Amplitude Modulation\uff0c\u4e2d\u6587\u540d\u53eb\u505a\u56db\u7535\u5e73\u8109\u51b2\u5e45\u5ea6\u8c03\u5236\u3002\u5b83\u662f\u4e00\u79cd\u8c03\u5236\u6280\u672f\uff0c\u91c7\u75284\u4e2a\u4e0d\u540c\u7684\u4fe1\u53f7\u7535\u5e73\u6765\u8fdb\u884c\u4fe1\u53f7\u4f20\u8f93\u3002<\/span><\/section>\n

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PAM4\u8c03\u5236<\/span><\/section>\n
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\u8fd9\u6837\u4e00\u6765\uff0c\u5355\u4e2a\u7b26\u53f7\u5468\u671f\u8868\u793a\u7684\u903b\u8f91\u4fe1\u606f\uff0c\u4eceNRZ\u76841bit\uff0c\u53d8\u6210\u4e862bit\uff0c\u7ffb\u4e86\u4e00\u500d\u3002<\/span><\/section>\n

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NRZ VS PAM4 \uff08\u53f3\u8fb9\u662f\u773c\u56fe\uff09<\/span>
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\u4e3b\u8981\u539f\u56e0\uff0c\u8fd8\u662f\u5728\u4e8e\u6fc0\u5149\u5668\u7684\u6280\u672f\u5de5\u827a\uff08\u5c0f\u660e\u7684\u5634\u4e0a\u529f\u592b<\/span>\uff09\u3002\u5b9e\u73b0PAM4\uff0c\u9700\u8981\u6fc0\u5149\u5668\u80fd\u591f\u505a\u5230\u5bf9\u529f\u7387\u7684\u7cbe\u786e\u63a7\u5236\u3002<\/span><\/section>\n
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4\u4e2a\u7535\u5e73\uff0c4\u79cd\u5927\u5c0f\u7684\u6ce1\u6ce1\uff0c\u5c0f\u660e\u8981\u63a7\u5236\u5f97\u4f4f\uff0c\u4e0d\u80fd\u5439\u9519\u3002<\/span>\u5c0f\u767d\u4e5f\u8981\u770b\u5f97\u6e05\uff0c\u4e0d\u80fd\u770b\u9519\u3002<\/span><\/section>\n

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\u4e07\u4e00\u5439\u4e2a\u5ffd\u5927\u5ffd\u5c0f\u7684\uff0c\u5230\u5e95\u662fB\uff1f\u8fd8\u662fC\u5462\uff1f<\/span><\/p>\n

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\u5982\u679c\u63a7\u5236\u4e0d\u597d\uff0c\u5c31\u4f1a\u9020\u6210\u5f88\u9ad8\u7684\u8bef\u7801\u7387\uff0c\u53ea\u80fd\u91cd\u65b0\u5439\uff0c\u5f71\u54cd\u4fe1\u53f7\u4f20\u8f93\u6548\u7387\u3002<\/span><\/section>\n
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PAM4\u5bf9\u566a\u58f0\u66f4\u52a0\u654f\u611f\u3002\u5982\u679c\u566a\u58f0\u592a\u5927\uff0c\u663e\u7136\u4e5f\u4f1a\u5bfc\u81f4PAM4\u8c03\u5236\u65e0\u6cd5\u6b63\u5e38\u5de5\u4f5c\u3002<\/span><\/section>\n
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\u5149\u7ea4\u901a\u4fe1\u7684\u4f20\u8f93\uff0c\u5439\u6ce1\u6ce1\u7684\u901f\u5ea6\u53ef\u662f\u975e\u5e38\u5feb\u7684\u3002<\/span><\/section>\n
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\u6211\u4eec\u4ee5\u5355\u8def25G\u6ce2\u7279\u7387\u4e3a\u4f8b\u3002\u6240\u8c13\u6ce2\u7279\u7387\uff08Baud Rate\uff09\uff0c\u5c31\u662f\u4e00\u79d2\u949f\u53ef\u4ee5\u53d1\u9001\u591a\u5c11\u4e2a\u5b8c\u6574\u8109\u51b2\u3002<\/span><\/section>\n

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\u4f8b\u598225G EML\u82af\u7247\uff0c\u7ea6\u4e00\u79d2\u949f\u53d1\u900125<\/span>\u00d710<\/span>9<\/sup><\/span>\u4e2a\u8109\u51b2\uff08\u6bcf\u79d2250\u4ebf\u4e2a\u6ce1\u6ce1\uff09\u3002\u91c7\u7528NRZ\u7684\u8bdd\uff0c\u90a3\u5c31\u662f\u901f\u7387\uff08\u6bd4\u7279\u7387\uff0cbit rate\uff09\u662f25Gbps\u3002\u91c7\u7528PAM4\u8c03\u5236\u6280\u672f\u7684\u8bdd\uff0c\u7ffb\u4e2a\u500d\uff0c\u53d8\u621050Gbps\u3002\u6240\u4ee5\uff0c1\u4e2a25G EML\u82af\u7247\u91c7\u7528PAM4\u8c03\u5236\u4e4b\u540e\uff0c\u5c31\u53ef\u4ee5\u505a\u6210\u4e86\u5355\u901a\u905350G\u7684PAM4\u5149\u6a21\u5757\u3002<\/span><\/section>\n
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