【应用】Laird通过单一的设计解决了数据中心光学收发器存在的电磁干扰以及热负荷等问题

时间： 2021-01-27 来源：Laird

技术问答

全球互联网流量的增加正在使数据中心应接不暇。然而，从中心内部发起或终止的互联网流量一直主导着整个数据处理。这使得高效交换机的设计势在必行。理想情况下，机架单元的端口数量应该与交换机专用集成电路(asic)的容量相匹配。因此，光学收发器和光学模块成为设计上的挑战。一个解决案例是由一个主要制造商的设计团队设计的一款具有紧凑、小规格、双密度并且可热插拔等特点的QSFP光收发模块。这种收发器可在单个机架单元中支持36个400GbE端口以及14Tb/s的带宽。另一个是该制造商的SFP光学模块。在设计的过程中，额外的功率、密度和尺寸限制，再加上更高的带宽，给设计者带来了一定的障碍。在面对多个杂散电磁干扰源和影响两个光学模块性能的不断上升的热负荷的情况下，该器件仍需要满足性能要求。

图1 光学发射组件与接收组件中存在的问题

案例记录情况

原来的两种设计是不充分的，其中一种方案只抑制5dB~6dB的电磁干扰噪声。电磁干扰来源有很多，包括IC驱动器、光学发射组件与接收组件(TOSA/ROSA)之间的连接器、内部电路板以及内部电路板与适配器之间的连接器等等。其中沿模块外壳侧壁的EMI表面噪声电流最为明显。值得关注的是TOSA/ROSA提供接地/屏蔽，以阻止噪声从光学模块的前开口处泄露。多余的热量是从TOSA/ ROSA，激光二极管驱动器和DSP芯片中散出(传热的方向是顶部和底部，也有PCB底部和侧面的传热。)。未来的QSFP和SFP设计需要全面降低功耗，从而限制温度。

解决方案

在对备选方案进行审查后，设计团队选择将他们的专业知识与LAIRD功能材料公司的材料科学和工程专家的技能相结合。Laird公司在涉及多功能解决方案的材料科学方面取得了进展。一个简单的Laird工艺设计能够同时解决影响元件性能的电磁干扰和散热问题。

实施

Laird提倡单线卡的噪声抑制量为10dB，两线卡的噪声抑制量为8dB，四线卡(半机架)的噪声抑制量为6dB。每个线卡有12个光学模块。Laird还对采用哪种射频/微波吸收器进行了分析计算。在HFSS中进行了26GHz的分析。对于SFP模块，在材料厚度为0.010英寸、 0.020英寸和0.040英寸的情况下测试了5种不同的吸收器放置位置。测试验证了“Laird™Eccosorb^®BSR-1厚度为0.10英寸，Laird Eccosorb^®MCS厚度为0.020英寸,Coolzorb 600厚度为0.060英寸“是最佳的解决方案。为了在QSFP模块上专门屏蔽TOSA/ROSA，设计师一直在使用环状的不锈钢垫圈，但角落的缺口表明电磁干扰抑制水平仍未达标。Laird建议用金属折叠护罩代替这个垫圈。另外，还可以通过石墨屏障和围绕TOSA/ROSA侧面的Laird导电泡沫CF515（ Laird Conductive Foam CF515 ）来减少热负荷，Laird热界面材料可以将TOSA/ROSA顶部和底部的热量有效传递出去。

图2 Laird的多功能解决方案

结论

由制造商确认的测试结果显示，使用Laird Eccosorb MCS、Eccosorb BSR-1和Laird Coolzorb 600组合，可以显著降低总辐射功率(TRP)，直至可接受范围。与此同时，Laird的解决方案将提供最佳的成本效益。另外的测试也证实了即使是在最严格控制的数据中心，这每一种方案都能使光学模块保持在可接受的温度范围之内。

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本文由Goulart翻译自Laird，版权归世强硬创平台所有，非经授权，任何媒体、网站或个人不得转载，授权转载时须注明“来源：世强硬创平台”。

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应用方案发布时间 : 2022-06-30

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Laird提供专业设计和供应的电磁干扰屏蔽产品、界面导热材料、磁性材料等产品，拥有全球领先的产品和服务，是全球众多著名品牌的合作伙伴。Laird拥有业界顶级的结构设计能力，可为客户提供形态丰富定制化服务。其致力于为国内电子设备厂商提供优质的热防护和EMI防护解决方案，让您的产品更加稳定、可靠。

间隙填充剂热界面材料液体间隙填充物电感元件微波吸收器外壳解决方案共同设计的防护罩多功能解决方案

授权代理商 - 世强控股有限公司线上商城技术资料

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【选型】Laird（莱尔德）电磁屏蔽材料选型指南

目录- 板级屏蔽罩通风孔盖板泡棉材料导电弹性体微波吸收材料

型号- 8904-0117-XX,ECE013,4693-PA-51H-01200,ECE011,8863-0150,8404-0121-XX,8906-0171-XX,8560-0099-XX,8907-0140-XX,8104-0104-40,8410-0105-50,8516-0201-XX,8908-0108-XX,BMI-S-209-F,4740,8401-0133-XX,8863-0140,8863-0145,8907-0174-XX,8563-0108-XX,8563-0133-XX,8403-0106-50,ECE032,ECE080/094,8563-0213-XX,8403-0105-XX,8901-0117-XX,8863-0130,8863-0135,4741,4500,4742,4501,4502,4744,8412-01XX-54,D6-785FX,8412-01XX-52,8915-0130-XX,8408-0251-XX,8901-0176-XX,4520,8412-01XX-55,8918-0105-XX,8402-01XX-XX,8412-01XX-50,8413-0105-64,8415-0112-64,8863-0120,4518,8904-0129-XX,8901-0140-XX,8103-0101-40,8863-0125,4512,4513,4516,8401-0121-XX,4517,4693 - PA - 51H - 01200,8563-0131-XX,4531,8560-0114-XX FIG. 2,8401-0155-XX,8863-0196,8412-01XX-61,8863-0197,8412-01XX-60,8560-0108-XX,8560-0143-XX,4529,4N64EF51N00225,4N64EM51N00171,8863-0198,8863-0199,8103-0125-40,4522,8907-0129-XX,4524,4525,8908-0180-XX,4528,2238 -.25,DS005,8103-0113-40,8563-0077-XX,BMI-S-207-F,4541,4300,4542,4N64ER51N00225,8863-0180,8104-01XX-48,8104-01XX-49,8415-0110-64,8908-0118-XX,8863-0183,8863-0184,8516-0211-XX,87-580,8909-0122-XX,4532,86-785,BMI-S-305,4533,8905-0157-XX,4534,4536,SNK60,4537,8401-0123-XX,SNC70-RXP,8868-0085,4791,8903-0171-XX,8560-0330-XX,4792,4N64EP51N00171,4795,8863-0170,8401-0111-XX,G1W,8905-0180-XX,8409-0173-50,8863-0175,8868-0084,8868-0081,8902-0135-XX,8904-0105-XX,8563-0089-XX,8860-0093-100-XX,4302,4786,4787,4788,4789,4548,8563-0165-XX,8902-0101-XX,8868-0075,4320,8863-0160,8101-0104-40,8868-0070,8863-0165,8409-0106-50,8414-0108-64,8402-0102-XX,4796,4797,4798,8403-0115-XX,4315,4799,8563-0143-XX,M83528/001X005,M83528/001X006,4570,M83528/001X003,4571,8563-0106-XX,M83528/001X004,4330,4572,M83528/001X009,4573,M83528/001X007,4575,M83528/001X008,8860-0093-324-XX,8401-0113-XX,8416-0320-22,5206 -.25,8563-0090-XX,2388,8904-0137-XX,4325,4568,4569,M83528/001X001,M83528/001X002,8404-0118-XX,8912-0140-XX,8416-0120-23,8101-01XX-49,8101-01XX-48,8550-XXXX-YY-ZZ,4582,8101-01XX-47,4583,8412-0104-50,4100,4584,8903-0122-XX,8101-0102-40,5092 - 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【选型】Laird（莱尔德）磁珠/磁环选型指南（中文）

目录- 铁氧体材料阻抗对比设计和选择的经验法则高频柱状磁芯高频分离,可拆卸磁芯宽带柱状磁芯宽带分离,可拆卸磁芯宽带磁芯参考图表低频柱状磁芯宽带带状可弯曲线缆磁芯宽带可拆卸带状和弯曲线缆磁芯铁氧体 EMI 圆盘和方盘用于无线充电的铁氧体板柔性铁氧体片磁芯样本套件列表

型号- 28B1225-000,28S2022-0M0,MHLL5040-000,28B0390-200,28R0592-010,MP1040-300,MSLL5040-200,28B0375-000,HFB143064-000,28R0610-000,28S2011-0P0,28R0852-500,MHLL6060-300,28B0592-000,28R1775-000,28A2024-0A0,28A2024-0A2,28R1953-000,LFB259128-000,28B0591-200,28A5131-0A2,28B1000-000,HFB170070-100,MP2170-1M0,28R1236-000,28R2170-000,28R0315-200,MULL6060-300,28B0250-100,28B1225-100,28R0480-000,28B0870-100,28R1518-000,28A2307-0A2,28B0734-000,28B0375-100,28B0999-000,LFB310190-000,HFB143064-100,28B0394-000,28B0315-100,28R1127-200,MP1040-200,MULL5040-000,28R1340-200,28B0629-000,HFB123049-000,28A0640-0A,HFB075024-000,28B0452-000,28R0614-100,28S2011-0M0,28A2809-0A2,28S2827-210,33P3839-0M0,HFB150070-200,28B0157-100,28A2025-0A,MSLL12060-000,28R1418-000,HFA150068-0A2,MM0650-100,HFB170070-000,28B0631-000,28R0900-100,28A3851-0A2,28R1779-000,28B0339-000,MHLL,28B1250-000,28R0480-100,28R2000-200,28A0434-0A2,28R1417-000,28R1240-010,28A0807-0A2,MP0433-000,HFB0473-200,HFA163090-0A2,28B0315-000,28B0625-000,MP1040-100,28R1340-100,33P2098-0M0,HFB123049-100,28A2025-0A2,28B1540-000,28A2738-0A2,28B0384-000,LFB143064-100,28R1261-100,28B0886-20H,28B0563-100,MP1496-000,28R0492-100,28R1227-100,28R0669-000,28S2022-0P0,28A2025-0A0,28B0631-100,28R0898-100,28A1507-0A2,HFB157070-000,LFB159079-000,28R1450-100,MP0315-200,28B0395-000,28B1225-300,28S0670-000,28B0485-000,28B1020-100,28B0625-100,28R1101-000,MULL12060-200,28R1127-000,28B0562-300,28R1022-000,28R1517-000,HFB259128-100,MP0350-000,28R1476-100,MULL5040-200,HFA100049-0A2,28B1142-100,28R0614-300,28B0686-000,28R0983-000,28A2432-0A2,28B0570-000,LFB143064-000,28A0640-0A2,LFB250150-000,28A0392-0A,28B0563-200,28B0141-000,28B0453-000,28A0350-0B2,LFB090050-000,HFA259131-0A2,28A0640-0A0,28A2029-0A2,MSLL12060-200,MSLL6060-300,28A2029-0A0,28S2001-0,28R1102-100,28B0268-000,28A2913-0A2,HFB160093-300,28B0470-000,LFB220140-000,MULL,28R1319-000,MP0591-200,HFB095051-200,28S2001-0P0,HFA187102-0A2,28B0773-050,HFB152034-000,28A2026-0A2,28B0375-400,28S2012-0M0,28B0384-200,28B0472-090,28R1127-500,28B0473-200,28R3149-000,28B0562-200,28B0735-300,28B0616-000,MP1496-0M0,28B1142-000,MP0512-200,28B0686-100,28B0825-000,MHLL12060-200,HFB123049-300,28R0945-000,28A0593-0A2,28B0474-000,28A5776-0A2,28R1457-400,28R0880-000,28R0453-200,LFB180100-000,28B2000-100,28B0250-700,28B0590-000,28B0500-100,LFB290190-000,28R1102-000,28R0756-000,28S2001-2A2,28A0392-0A0,28A0392-0A2,28R1862-000,MM0787-200,28R0984-000,MULL12060-000,HFA150066-0A2,28A4155-0A2,28B0672-000,28B0296-000,28S2011-0,28B0562-100,28B0686-200,28B0473-000,MP3940-0M0,28R1261-200,28R0453-300,28B0563-000,28R1025-000,MP2106-0M0,28B1122-100,28R0898-200,HFA100035-0A2,HFB159079-100,28S2022-0,LFB127079-000,28R1262-000,LFB360230-300,MSLL,MM1400-300,28A2029-0A,28B0870-000,MHLL5040-200,MM0787-100,28R2170-100,HFB143064-200,MSLL5040-000,MP1040-3M0,28B0275-000,28A0592-0A2,LFB095051-000,28R1128-100,28B0562-000,28B2400-000,MHLL12060-000,MP2126-0M0,HFB187102-100,28R1779-100,28S2001-0M0,28A2736-0A2,MP0590-200,28R1141-010,MP0760-100,28B0500-300,HFB160093-200,MM1400-200,LFB187102-000,28R0756-200,28R1103-000,HFB095051-100,28A3039-0A2,28B0434-000,28B0375-300,28R0984-200,28B1531-000,28A2024-0A,28A2005-0A2,28R1127-400,HFB100035-000,28R1128-200,28B1417-200,28B0735-000,HFB143064-300,28R1024-000,28B0355-000,28R1654-010,28B1122-300,28R0825-000,28S2023-0M0,LFB174095-000,28R1496-000,28R1262-200,28R0394-000

选型指南 - LAIRD - 2017年 PDF 中文下载

莱尔德高性能材料现身第六届中国国际进口博览会，全方位展示在电子游戏市场中的高效抗干扰和散热支持

2023年11月5日至10日，杜邦公司（LAIRD母公司）以“迎变·创新·向未来”为主题，亮相在第六届中国国际进口博览会，全面展示其多元化的高科技材料和解决方案如何助力各行各业加速创新与可持续发展，实现面向未来的繁荣图景。展会期间，杜邦电子互连科技为您展示在AI引领，智能互连（电子科技）；智领前行，驭电新生(下一代汽车）；以及卓越工业，材料赋能（工业技术）三个主题方向的先进材料及创新应用。

原厂动态发布时间 : 2023-11-25

【选型】Laird（莱尔德）导电橡胶选型指南

目录- ELECTROSEAL™导电橡胶压制品矩形条导电橡胶压制品空心矩形条导电橡胶压制品空心D型条导电橡胶压制品 O型条管导电橡胶压制品 D型条导电橡胶压制品通道条导电橡胶压制品 O型条导电橡胶压制品 P型条导电橡胶压制品 GEMINI™混合压成品模制O型环平垫圈垫片模制波导垫片矩形波导垫片 ElectroMet™定向线 ElectroMet™浸渍钢丝网和金属网状MIL接头垫片 MIL连接器垫圈 D型超小接头屏蔽罩自动点胶工艺现场制模电路板防护罩 ElectroCoat™导电橡胶板到底盘托脚 EMI垫片的腐蚀性

型号- 8408-0227-XX,8863-0150,8569-0131-XX,8516-0132-XX,8516-0155-XX,8560-0099-XX,8560-0110-XX,8563-0167-XX,8516-0201-XX,8860-0100-300-XX,8563-0098-XX,8866-0100,8863-0140,8863-0145,8866-0103,8866-0105,8563-0315-XX,8516-0109-XX,8867-0166,8867-0165,8563-0108-XX,8516-0120-XX,8563-0076-XX,8563-0326-XX,8563-0213-XX,8863-0130,8866-0110,SIL35-HXP,8866-0111,8863-0135,8866-0116,8563-0339-XX,8408-0215-XX,8516-0108-XX,8516-0167-XX,8408-0251-XX,8866-0120,8560-0144-XX,8863-0120,8866-0125,8860-0020-150-XX,8866-0126,8866-0127,8563-0122-XX,8516-0156-XX,8866-0129,8560-0098-XX,8516-0131-XX,8863-0125,8563-0131-XX,8516-0145-XX,8860-0125-100-XX,8563-0248-XX,8863-0196,8863-0197,8560-0108-XX,8560-0143-XX,8863-0199,8408-0203-XX,8563-0077-XX,8516-0119-XX,8516-0157-XX,8863-0180,8563-0281-XX,8860-0045-324-XX,8863-0183,8863-0184,8516-0211-XX,8863-0189,8516-0405-XX,8408-0126-XX,8516-0168-XX,8563-0166-XX,SNC70-RXP,8868-0085,8560-0330-XX,8516-0118-XX,8863-0170,8868-0084,8863-0175,8868-0081,8516-0130-XX,8563-0089-XX,8860-0093-100-XX,8516-0146-XX,8516-0169-XX,8563-0165-XX,8408-0230-XX,8863-0160,8408-0213-XX,8516-0212-XX,8863-0165,8516-0107-XX,8563-0143-XX,8516-0141-XX,8516-0164-XX,8563-0106-XX,8563-0078-XX,8516-0135-XX,8860-0093-324-XX,8416-0320-22,8516-0404-XX,8563-0090-XX,8408-0127-XX,8563-0129-XX,8416-0120-23,8516-0123-XX,8563-0130-XX,8408-0242-XX,8860-0045-300-XX,8416-0320-21,8563-0187-XX,8516-0204-XX,8563-0279-XX,8408-0254-XX,8408-0116-XX,8408-0212-XX,8516-0153-XX,8563-0255-XX,8563-0232-XX,8560-0158-XX,8516-0111-XX,8560-0331-XX,8867-0105,8563-0079-XX,8860-0093-300-XX,8516-0403-XX,8563-0280-XX,8867-0100,8563-0164-XX,8867-0102,8867-0101,8560-0113-XX,8867-0136,8416-0120-57,8563-0068-XX,8563-0139-XX,8563-0211-XX,8516-0122-XX,8563-0080-XX,8560-0100-XX,8563-0140-XX,8563-0234-XX,8408-0140-XX,8862-0105,8563-0257-XX,SNN60-RXP,8862-0100,8867-0130,8516-0165-XX,8860-0032-324-XX,8867-0126,8867-0125,8867-0128,8860-0062-100-XX,8867-0127,SNL25-RXP,8860-0032-150-XX,8860-0125-324-XX,8563-0091-XX,8408-0200-XX,8563-0128-XX,8867-0158,SNL60-RXP,8560-0145-XX,8560-0097-XX,8516-0203-XX,8860-0045-100-XX,8563-0327-XX,8867-0147,8563-0069-XX,8863-01200,8408-0117-XX,8516-0121-XX,8862-0114,8867-0144,8862-0113,8408-0128-XX,8516-0110-XX,8563-0185-XX,8862-0112,8867-0141,8864-2618,8408-0118-XX,8868-0100,8861-0130,8861-0131,8861-0135,8861-0136,8864-3824,8563-0253-XX,8560-0104-XX,8563-0196-XX,8408-0130-XX,8868-0105,8860-0100-100-XX,8516-0161-XX,8861-0120,8861-0121,8861-0125,8864-3714,8864-3715,8860-0093-150-XX,8408-0221-XX,SNC70-HXP,8516-0126-XX,8563-0070-XX,8560-0116-XX,8865-0144,8516-0137-XX,8516-0162-XX,8516-0114-XX,8865-0140,8860-0125-150-XX,8861-0110,8861-0115,8860-0125-300-XX,SNN65-HXP,8860-0062-324-XX,8408-0245-XX,8563-0127-XX,8865-0145,8563-0161-XX,8596-0096-XX,8861-0105,8563-0241-XX,8864-0105,8864-0104,8864-0103,8864-0102,8563-0218-XX,8864-0101,8408-0209-XX,8864-0100,8516-0173-XX,8861-0100,8560-0299-XX,8861-0103,8563-0334-XX,8865-0120,8560-0114-XX,8408-0120-XX,8563-0116-XX,8516-0102-XX,8516-0125-XX,8516-0151-XX,8864-0110,8864-0231,8516-0205-XX,8560-0435-XX,8416-0330-21,8563-0071-XX,8416-0330-22,8865-0125,8865-0130,8864-0127,8864-0125,8408-0257-XX,8563-0243-XX,8563-0094-XX,8516-0136-XX,8864-3515,8563-0159-XX,8563-0254-XX,8864-0120,8516-0185-XX,8865-0135,8864-0139,8864-0137,8865-0100,8563-0072-XX,8864-0136,8864-0135,8563-0095-XX,8560-0231-XX,8860-0032-300-XX,8516-0101-XX,8865-0105,SNK55-RXP,8865-0110,8864-0147,8516-0163-XX,8864-0144,8516-0124-XX,8516-0152-XX,8864-0143,8865-0116,8560-0505-XX,8864-0142,8563-0126-XX,8864-0141,8569-0127-XX,8860-0062-300-XX,8865-0115,8563-0324-XX,8864-0159,8864-0156,8868-0067,8516-0170-XX,8866-0050,8516-0158-XX,8516-0209-XX,8516-0106-XX,8864-0153,8868-0055,8563-0073-XX,8864-0168,8864-0167,8868-0056,8864-0166,8563-0342-XX,8563-0285-XX,8408-0133-XX,8563-0250-XX,8408-0218-XX,8516-0147-XX,8864-0163,8864-0162,8864-0161,8408-0294-XX,8864-0160,8408-0206-XX,8408-0248-XX,8860-0100-150-XX,8516-0210-XX,8563-0062-XX,8861-0192,8861-0193,8563-0226-XX,8560-0234-XX,8864-0055,8864-0053,8864-0173,8864-0172,8864-0050,8864-0171,8563-0274-XX,8864-010462,8864-0170,ELECTROCOAT,8563-0323-XX,8860-0032-100-XX,8563-0096-XX,8861-0188,8560-0444-XX,8516-0159-XX,8861-0189,8560-0107-XX,8563-0249-XX,8408-0110-XX,8861-0181,8861-0182,8861-0183,8861-0184,8864-0060,8864-0180,8563-0074-XX,8560-0200-XX,8563-0263-XX,8860-0020-300-XX,8563-0097-XX,8516-0160-XX,8861-0174,8563-0343-XX,8861-0175,8866-0130,8866-0131,8861-0179,8866-0134,8866-0135,8866-0136,8866-0137,8863-0110,8866-0139,8861-0172,8861-0173,8863-0115,8408-0111-XX,8516-0148-XX,8516-0408-XX,8563-0180-XX,8563-0216-XX,8408-0123-XX,8860-0045-150-XX,8516-0171-XX,8563-0113-XX,8861-0167,8861-0169,8860-0020-100-XX,8516-0105-XX,8866-0148,8863-0100,8560-0453-XX,8560-0105-XX,8863-0105,8861-0160,8516-0208-XX,8860-0100-324-XX,8868-0120,8563-0322-XX,8868-0125,8516-0172-XX,8861-0155,8866-0155,8864-0091,8516-0104-XX,8864-0090,8560-0106-XX,8563-0123-XX,8563-0251-XX,8861-0150,8860-0062-150-XX,8864-0095,8563-0075-XX,8516-0138-XX,8563-0344-XX,8

选型指南 - LAIRD - 2016年05月17日 PDF 中文下载