{"id":4216,"date":"2026-02-11T15:30:51","date_gmt":"2026-02-11T07:30:51","guid":{"rendered":"https:\/\/laserdiode-ld.com\/?p=4216"},"modified":"2026-01-26T13:22:44","modified_gmt":"2026-01-26T05:22:44","slug":"%e5%85%89%e8%b0%b1%e7%ba%af%e5%ba%a6%e5%b7%a5%e7%a8%8b%e5%ad%a6%e7%aa%84%e7%ba%bf%e5%ae%bd-dfb-%e5%85%89%e7%ba%a4%e8%80%a6%e5%90%88%e6%bf%80%e5%85%89%e5%99%a8%e7%9a%84%e7%89%a9%e7%90%86%e5%ad%a6","status":"publish","type":"post","link":"https:\/\/laserdiode-ld.com\/zh\/the-physics-of-spectral-purity-engineering-narrow-linewidth-dfb-fiber-coupled-lasers-html","title":{"rendered":"\u5149\u8c31\u7eaf\u5ea6\u7269\u7406\u5b66\uff1a\u7a84\u7ebf\u5bbd DFB \u5149\u7ea4\u8026\u5408\u6fc0\u5149\u5668\u7684\u5de5\u7a0b\u8bbe\u8ba1"},"content":{"rendered":"

\u76f8\u5e72\u7684\u7ed3\u6784\uff1a\u8d85\u8d8a\u7b80\u5355\u7684\u5149\u5b50\u53d1\u5c04<\/h2>\n\n\n\n

\u5728\u5149\u7535\u5b50\u5b66\u8fd9\u4e00\u4e13\u4e1a\u9886\u57df DFB\uff08\u5206\u5e03\u53cd\u9988\uff09\u5149\u7ea4\u8026\u5408\u6fc0\u5149\u5668<\/strong> \u4ee3\u8868\u4e86\u534a\u5bfc\u4f53\u5149\u8c31\u63a7\u5236\u7684\u9876\u5cf0\u3002\u6807\u51c6\u6cd5\u5e03\u91cc-\u73c0\u7f57\u6fc0\u5149\u5668\u5141\u8bb8\u591a\u4e2a\u7eb5\u5411\u6a21\u5f0f\u5728\u8154\u5185\u632f\u8361\uff0c\u4ece\u800c\u4ea7\u751f\u5bbd\u5e7f\u3001\u4e0d\u7a33\u5b9a\u7684\u5149\u8c31\uff0c\u800c DFB \u7ed3\u6784\u5219\u8feb\u4f7f\u6fc0\u5149\u5668\u5728\u5355\u4e00\u3001\u7cbe\u786e\u7684\u9891\u7387\u4e0a\u5de5\u4f5c\u3002\u8fd9\u4e0d\u4ec5\u4ec5\u662f\u5bf9 \u201c\u66f4\u7eaf\u51c0 \u201d\u5149\u7ebf\u7684\u504f\u597d\uff1b\u5bf9\u4e8e\u5206\u5e03\u5f0f\u58f0\u5b66\u4f20\u611f (DAS) \u6216\u76f8\u5e72\u5149\u901a\u4fe1\u7b49\u5e94\u7528\u800c\u8a00\uff0c\u5149\u8c31\u7eaf\u51c0\u5ea6\u662f\u7cfb\u7edf\u6027\u80fd\u7684\u57fa\u672c\u4fdd\u8bc1\u3002.<\/p>\n\n\n\n

\u4ece\u591a\u6a21\u5f0f\u4fe1\u53f7\u6e90\u5411\u5355\u9891\u4fe1\u53f7\u6e90\u7684\u8fc7\u6e21 1550nm DFB \u6fc0\u5149\u5668<\/strong> \u8fd9\u6d89\u53ca\u8154\u4f53\u7269\u7406\u5b66\u7684\u6839\u672c\u8f6c\u53d8\u3002DFB \u6fc0\u5149\u5668\u5e76\u4e0d\u4f9d\u8d56\u534a\u5bfc\u4f53\u82af\u7247\u7684\u5207\u5272\u9762\u4f5c\u4e3a\u53cd\u5c04\u955c\uff0c\u800c\u662f\u5728\u82af\u7247\u7684\u6709\u6e90\u533a\u76f4\u63a5\u52a0\u5165\u4e00\u4e2a\u5468\u671f\u6027\u7ed3\u6784--\u5e03\u62c9\u683c\u5149\u6805\u3002\u8fd9\u79cd\u5149\u6805\u8d77\u5230\u9891\u7387\u9009\u62e9\u6ee4\u6ce2\u5668\u7684\u4f5c\u7528\uff0c\u53ea\u5141\u8bb8\u5355\u4e00\u6ce2\u957f\u53d1\u751f\u5efa\u8bbe\u6027\u5e72\u6d89\u3002\u5bf9\u4e8e\u5de5\u7a0b\u5e08\u6765\u8bf4\uff0c\u6311\u6218\u5728\u4e8e\u5982\u4f55\u5b9e\u73b0\u8fd9\u79cd\u5149\u6805\uff0c\u4ee5\u53ca\u5982\u4f55\u5c06\u5176\u8026\u5408\u5230\u6fc0\u5149\u5668\u4e2d\u3002 \u504f\u632f\u7ef4\u6301\u5149\u7ea4\u6fc0\u5149\u5668<\/a><\/strong> \u7cfb\u7edf\uff0c\u800c\u4e0d\u4f1a\u4ea7\u751f\u76f8\u4f4d\u566a\u58f0\u6216\u673a\u68b0\u4e0d\u7a33\u5b9a\u6027\u3002.<\/p>\n\n\n\n

\u91cf\u5b50\u5149\u6805\u7269\u7406\u5b66\uff1a\u9891\u7387\u9009\u62e9\u673a\u5236<\/h2>\n\n\n\n

DFB \u6fc0\u5149\u5668\u7684\u6838\u5fc3\u662f\u5185\u90e8\u5e03\u62c9\u683c\u5149\u6805\u3002\u8fd9\u79cd\u5149\u6805\u662f\u6298\u5c04\u7387\u6cbf\u6fc0\u5149\u8154\u7eb5\u8f74\u7684\u5468\u671f\u6027\u53d8\u5316\u3002\u5176\u7269\u7406\u539f\u7406\u53d7\u5e03\u62c9\u683c\u6761\u4ef6\u652f\u914d\uff1a<\/p>\n\n\n\n

$$\\lambda_{Bragg} = 2 \\cdot n_{eff}\\cdot \\Lambda$$<\/p>\n\n\n\n

\u5176\u4e2d\uff0c$\\lambda_{Bragg}$ \u662f\u76ee\u6807\u6ce2\u957f\uff0c$n_{eff}$ \u662f\u6ce2\u5bfc\u7684\u6709\u6548\u6298\u5c04\u7387\uff0c$\\Lambda$ \u662f\u5149\u6805\u7684\u5468\u671f\u3002.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

$\\lambda\/4$ \u76f8\u79fb\u548c\u6a21\u5f0f\u7a33\u5b9a\u6027<\/h3>\n\n\n\n

\u5b8c\u5168\u5747\u5300\u7684\u5149\u6805\u5b9e\u9645\u4e0a\u652f\u6301\u56f4\u7ed5\u5e03\u62c9\u683c\u9891\u7387\u5bf9\u79f0\u5206\u5e03\u7684\u4e24\u4e2a\u6a21\u5f0f\u3002\u4e3a\u786e\u4fdd\u771f\u6b63\u7684\u5355\u6a21\u8fd0\u884c\uff0c\u9ad8\u7aef 1550 nm DFB<\/strong> \u82af\u7247\u5728\u5149\u6805\u4e2d\u5fc3\u52a0\u5165\u4e86 $\\lambda\/4$ \u76f8\u79fb\u3002\u8fd9\u79cd\u504f\u79fb\u4f1a\u5728\u7cbe\u786e\u7684\u5e03\u62c9\u683c\u6ce2\u957f\u5904\u4ea7\u751f\u5171\u632f\uff0c\u4ece\u800c\u6709\u6548\u6291\u5236\u7b2c\u4e8c\u6a21\u5f0f\uff0c\u4f7f\u8fb9\u6a21\u6291\u5236\u6bd4\uff08SMSR\uff09\u901a\u5e38\u8d85\u8fc7 45 dB \u751a\u81f3 50 dB\u3002.<\/p>\n\n\n\n

\u4ece\u5de5\u7a0b\u89d2\u5ea6\u6765\u770b\uff0c\u8fd9\u79cd\u5149\u6805\uff08\u901a\u5e38\u901a\u8fc7\u7535\u5b50\u675f\u5149\u523b\u6216\u5168\u606f\u5e72\u6d89\u6280\u672f\u5236\u9020\uff09\u7684\u8d28\u91cf\u51b3\u5b9a\u4e86\u6fc0\u5149\u5668\u7684 \u201c\u7ebf\u5bbd\u201d\u3002\u7a84\u7ebf\u5bbd\uff08\u6807\u51c6 DFB \u901a\u5e38\u5c0f\u4e8e 1 MHz\uff0c\u9ad8\u7aef\u53d8\u4f53\u5c0f\u4e8e 100 kHz\uff09\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u5b83\u76f4\u63a5\u51b3\u5b9a\u4e86\u5149\u7684\u76f8\u5e72\u957f\u5ea6\u3002\u5728\u4f20\u611f\u65b9\u9762\uff0c\u8f83\u7a84\u7684\u7ebf\u5bbd\u53ef\u4ee5\u5728\u4e0d\u4e22\u5931\u4fe1\u53f7\u76f8\u4f4d\u5173\u7cfb\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u66f4\u8fdc\u8ddd\u79bb\u7684\u6d4b\u91cf\u3002.<\/p>\n\n\n\n

\u76f8\u4f4d\u566a\u58f0\u548c\u8096\u6d1b-\u5510\u65af\u6781\u9650<\/h2>\n\n\n\n

\u5355\u4e00\u9891\u7387\u7684\u7ebf\u5bbd \u5149\u7ea4\u8026\u5408\u6fc0\u5149\u5668<\/a> \u4e0d\u4e3a\u96f6\u3002\u5b83\u53d7\u5230\u76f8\u4f4d\u566a\u58f0\u7684\u9650\u5236\uff0c\u800c\u76f8\u4f4d\u566a\u58f0\u4e3b\u8981\u662f\u7531\u5149\u5b50\u81ea\u53d1\u53d1\u5c04\u8fdb\u5165\u6fc0\u5149\u6a21\u5f0f\u5f15\u8d77\u7684\u3002\u8fd9\u53ef\u4ee5\u7528\u4fee\u6b63\u7684 Schawlow-Townes \u516c\u5f0f\u6765\u63cf\u8ff0\uff1a<\/p>\n\n\n\n

$$\\Delta \\nu = \\frac{h \\nu v_g^2 \\alpha_m \\alpha_{tot} (1 + \\alpha_H^2)}{4 \\pi P}$$<\/p>\n\n\n\n

\u5176\u4e2d $\\alpha_H$ \u662f\u4ea8\u5229\u7ebf\u5bbd\u589e\u5f3a\u56e0\u5b50\uff0c\u5b83\u8003\u8651\u4e86\u6298\u5c04\u7387\u548c\u8f7d\u6d41\u5b50\u5bc6\u5ea6\u6ce2\u52a8\u4e4b\u95f4\u7684\u8026\u5408\u3002.<\/p>\n\n\n\n

\u4e3a\u4e86\u5c3d\u91cf\u51cf\u5c0f\u7ebf\u5bbd\uff0c\u5236\u9020\u5546\u5fc5\u987b\u4f18\u5316 InGaAsP\/InP \u5c42\u7684 \u201c\u91cf\u5b50\u9631 \u201d\u8bbe\u8ba1\uff0c\u4ee5\u51cf\u5c0f $\\alpha_H$ \u56e0\u5b50\u3002\u6b64\u5916\uff0c\u7a7a\u8154\u4e2d\u7684\u529f\u7387 $P$ \u5fc5\u987b\u6700\u5927\u5316\uff0c\u4f46\u8fd9\u9700\u8981\u6743\u8861\uff1a\u66f4\u9ad8\u7684\u529f\u7387\u4f1a\u589e\u52a0\u5149\u6805\u4e0a\u70ed\u68af\u5ea6\u7684\u98ce\u9669\uff0c\u4ece\u800c\u5bfc\u81f4\u9891\u7387 \u201c\u5541\u557e \u201d\u751a\u81f3\u8df3\u6a21\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5149\u6805\u7684\u70ed\u5de5\u7a0b \u5149\u7ea4\u8026\u5408\u6fc0\u5149\u5668\u6a21\u5757<\/a><\/strong> \u4e0e\u534a\u5bfc\u4f53\u7269\u7406\u5b66\u672c\u8eab\u4e00\u6837\u91cd\u8981\u3002.<\/p>\n\n\n\n

\u5b9e\u65bd\uff1a\u8776\u5f62\u5c01\u88c5\u548c\u5149\u5b66\u9694\u79bb<\/h2>\n\n\n\n

\u5f53\u4e00\u4e2a DFB \u82af\u7247\u96c6\u6210\u5230\u4e00\u4e2a \u5149\u7ea4\u8026\u5408\u5149\u63a5\u6536\u5668<\/a><\/strong> \u6216\u53d1\u5c04\u673a\u7cfb\u7edf\uff0c\u5c01\u88c5\u5fc5\u987b\u4fdd\u62a4\u5149\u6e90\u7684\u5149\u8c31\u5b8c\u6574\u6027\u300214 \u5f15\u811a\u8776\u5f62\u5c01\u88c5\u662f DFB \u6fc0\u5149\u5668\u7684\u884c\u4e1a\u6807\u51c6\uff0c\u539f\u56e0\u6709\u4ee5\u4e0b\u51e0\u70b9\uff1a<\/p>\n\n\n\n

    \n
  1. \u70ed\u5e73\u8861<\/strong> \u5185\u90e8\u7684\u70ed\u7535\u51b7\u5374\u5668\uff08TEC\uff09\u80fd\u4ee5\u6beb\u5f00\u5c14\u6587\u7684\u7cbe\u5ea6\u4fdd\u6301\u82af\u7247\u6e29\u5ea6\u3002\u7531\u4e8e DFB \u6fc0\u5149\u5668\u7684\u6ce2\u957f\u4ee5 ~0.1nm\/\u00b0C \u7684\u901f\u5ea6\u53d8\u5316\uff0c\u56e0\u6b64\u6e29\u5ea6\u7a33\u5b9a\u6027\u662f\u786e\u4fdd\u9891\u7387\u7a33\u5b9a\u6027\u7684\u552f\u4e00\u65b9\u6cd5\u3002.<\/li>\n\n\n\n
  2. \u53cd\u601d\u7ba1\u7406\uff1a<\/strong> DFB \u6fc0\u5149\u5668\u5bf9\u5149\u53cd\u9988\u6781\u4e3a\u654f\u611f\u3002\u5373\u4f7f\u662f\u6765\u81ea\u5149\u7ea4\u8fde\u63a5\u5668\u7684 -30 dB \u53cd\u5c04\u4e5f\u4f1a\u7834\u574f\u5185\u90e8\u5149\u6805\u7684\u7a33\u5b9a\u6027\uff0c\u5bfc\u81f4\u7ebf\u5bbd\u53d8\u5bbd\u6216\u9891\u7387\u4e0d\u7a33\u5b9a\u3002\u4e13\u4e1a\u7684 DFB \u6a21\u5757\u5305\u542b\u4e00\u4e2a\u5185\u90e8\u5149\u9694\u79bb\u5668\uff08\u901a\u5e38\u4e3a\u53cc\u7ea7\uff09\uff0c\u53ef\u63d0\u4f9b\u5927\u4e8e 40 dB \u7684\u9694\u79bb\u3002.<\/li>\n\n\n\n
  3. \u5c04\u9891\u963b\u6297\u5339\u914d<\/strong> \u5bf9\u4e8e\u9ad8\u901f\u8c03\u5236\uff08\u9ad8\u8fbe 10 GHz \u6216\u66f4\u9ad8\uff09\uff0c\u5c01\u88c5\u5fc5\u987b\u63d0\u4f9b 50 \u6b27\u59c6\u7684\u963b\u6297\u5339\u914d\uff0c\u4ee5\u9632\u6b62\u4fe1\u53f7\u53cd\u5c04\u5e26\u6765 \u201c\u6296\u52a8 \u201d\u6216\u76f8\u4f4d\u566a\u58f0\u3002.<\/li>\n<\/ol>\n\n\n\n

    \u5143\u4ef6\u8d28\u91cf\u4e0e\u4fe1\u53f7\u5b8c\u6574\u6027\uff1a\u6210\u672c\u5206\u6790<\/h2>\n\n\n\n

    \u5728\u5206\u5e03\u5f0f\u58f0\u5b66\u4f20\u611f\uff08DAS\uff09\u5e02\u573a\u4e2d \u7a84\u7ebf\u5bbd\u6fc0\u5149\u4e8c\u6781\u7ba1<\/a><\/strong> \u901a\u5e38\u662f\u8be2\u95ee\u88c5\u7f6e\u4e2d\u6700\u6602\u8d35\u7684\u5355\u4e2a\u7ec4\u4ef6\u3002\u5bf9\u4e8e\u7cfb\u7edf\u96c6\u6210\u5546\u6765\u8bf4\uff0c\u91c7\u8d2d\u6210\u672c\u8f83\u4f4e\u7684 DFB \u6a21\u5757\u5f88\u6709\u8bf1\u60d1\u529b\u3002\u7136\u800c\uff0c\u201c\u8d28\u91cf\u6210\u672c \u201d\u4f53\u73b0\u5728\u6700\u7ec8\u7cfb\u7edf\u7684\u4fe1\u566a\u6bd4\uff08SNR\uff09\u4e0a\u3002.<\/p>\n\n\n\n

    \u4f4e\u6210\u672c DFB \u6fc0\u5149\u5668\u7684\u7ebf\u5bbd\u53ef\u80fd\u4e3a 5 MHz\uff0cSMSR \u4e3a 35 dB\u3002\u867d\u7136\u8fd9\u5bf9\u4e8e\u57fa\u672c\u7684\u6570\u636e\u4f20\u8f93\u6765\u8bf4\u4f3c\u4e4e\u5df2\u7ecf\u8db3\u591f\uff0c\u4f46\u5728\u7528\u4e8e\u7ba1\u9053\u76d1\u6d4b\u7684 DAS \u7cfb\u7edf\u4e2d\uff0c5 MHz \u7684\u7ebf\u5bbd\u4f1a\u5bfc\u81f4\u5f88\u9ad8\u7684 \u201c\u76f8\u4f4d\u672c\u5e95\u566a\u58f0\u201d\u3002\u8fd9\u79cd\u566a\u58f0\u4f1a\u63a9\u76d6\u6cc4\u6f0f\u6216\u7b2c\u4e09\u65b9\u5165\u4fb5\u9020\u6210\u7684\u5fae\u5c0f\u58f0\u6ce2\u632f\u52a8\u3002\u4e3a\u4e86\u5f25\u8865\u6fc0\u5149\u5668\u7684\u4e0d\u8db3\uff0c\u7cfb\u7edf\u5f00\u53d1\u4eba\u5458\u5fc5\u987b\u6295\u8d44\u66f4\u6602\u8d35\u7684\u4f4e\u566a\u58f0\u653e\u5927\u5668\u548c\u590d\u6742\u7684\u6570\u5b57\u4fe1\u53f7\u5904\u7406\uff08DSP\uff09\u7b97\u6cd5\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u4ece\u4f18\u8d28\u7684\u4f4e\u76f8\u4f4d\u566a\u58f0 1550nm DFB \u6fc0\u5149\u5668<\/strong> \u8fd9\u5927\u5927\u7b80\u5316\u4e86\u4e0b\u6e38\u7535\u5b50\u8bbe\u5907\uff0c\u63d0\u9ad8\u4e86\u7cfb\u7edf\u7684 \u201c\u68c0\u6d4b\u6982\u7387\u201d\uff0c\u6700\u7ec8\u964d\u4f4e\u4e86\u4f20\u611f\u5668\u7f51\u7edc\u7684\u603b\u6210\u672c\u3002.<\/p>\n\n\n\n

    \u6848\u4f8b\u7814\u7a76\uff1a\u7528\u4e8e\u6d77\u5e95\u7535\u529b\u7535\u7f06\u76d1\u6d4b\u7684 DAS<\/h2>\n\n\n\n

    \u5ba2\u6237\u80cc\u666f\uff1a<\/p>\n\n\n\n

    \u4e00\u5bb6\u6d77\u4e0a\u98ce\u7535\u573a\u8fd0\u8425\u5546\u9700\u8981\u4e00\u5957\u5206\u5e03\u5f0f\u58f0\u5b66\u4f20\u611f\uff08DAS\uff09\u7cfb\u7edf\uff0c\u4ee5\u76d1\u6d4b 50 \u516c\u91cc\u8ddd\u79bb\u5185\u6d77\u5e95\u9ad8\u538b\u7535\u529b\u7535\u7f06\u7684\u5b8c\u6574\u6027\u3002.<\/p>\n\n\n\n

    \u6280\u672f\u6311\u6218\uff1a<\/p>\n\n\n\n

    \u4e3b\u8981\u7684\u6311\u6218\u662f\u540e\u5411\u6563\u5c04\u745e\u5229\u4fe1\u53f7\u7684\u8870\u51cf\u3002\u5728 50 \u5343\u7c73\u8303\u56f4\u5185\uff0c\u8fd4\u56de\u5149\u7ea4\u8026\u5408\u5149\u5b66\u63a5\u6536\u5668\u7684\u4fe1\u53f7\u975e\u5e38\u5fae\u5f31\u3002.<\/p>\n\n\n\n