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AI算力800G/1.6T光模块封装材料:黑色聚酰亚胺薄膜的作用与遮光性能评价

AI算力800G/1.6T光模块封装材料:黑色聚酰亚胺薄膜的作用与遮光性能评价

高速光模块(High-Speed Optical Module)是一个安装在AI算力服务器或交换机上的硬件组件,它是一个“光电转换器”AI大模型训练,高速光模块是支撑GPU之间超高带宽、超低延迟的“东西向流量”通信,确保整个GPU集群能像一个巨型单体GPU一样协同工作。具体作用如下

1.克服铜线(电信号)的极限:

光模块将电信号转换为光信号,利用光纤进行传输。光信号的衰减极低,可以轻松支持数百米甚至数公里的高速数据传输,彻底解决了电信号的距离瓶颈。

2.实现大规模并行计算: 

高速光模块构建了一个庞大的高速通信网络(通常基于NVIDIAInfiniBand或超高速以太网)。它使得任何一张GPU都可以快速地将数据发送给集群中的任何其他GPU,实现了所谓的“All-to-All”(全对全)通信。没有这个高速网络,GPU之间通信堵塞,大部分时间都会在“等待数据”中度过,算力将严重浪费。

3. 提供“高带宽”与“低延迟”

高带宽(High Bandwidth): 800G/1.6T的超高带宽意味着“路非常宽”,可以同时传输海量数据,确保GPU之间庞大的参数同步能够快速完成。

低延迟(Low Latency): 光模块和其内置的DSP芯片致力于将光电转换和信号处理的时间压缩到极致(纳秒级)。低延迟意味着GPU发出通信请求后,能以最快速度得到响应,减少了等待时间,从而最大化了GPU用于有效计算的时间(即“算力利用率”)。

4. 支撑集群的可扩展性(Scalability

随着AI模型越来越大,AI集群的规模也需要不断扩展。基于光纤和光模块的架构具有极佳的灵活性和扩展性。无论是增加几十个机柜,还是新建一个数据中心,都可以通过部署光纤网络无缝地将新增的算力接入到现有集群中,而不会受到物理距离的限制。

黑色PI膜(Black Polyimide Film,即黑色聚酰亚胺薄膜)在高速光模块(如400G800G甚至1.6T光模块)的制造和封装中扮演着非常关键的辅材角色。高速光模块内部集成了高精密的光学器件和高频电子元器件,且运行环境温度较高、空间极其狭小,因此对材料的要求非常高。

黑色PI膜在高速光模块中主要发挥以下几方面作用

1. 遮光与防串扰

防止杂散光干扰光模块内部包含激光器(发射端,如VCSELEML等)和光电探测器(接收端,如PD)。黑色PI需要具有优异的遮光性能(低透光率通常小于0.1%),可以用来包裹或隔离特定的光学组件,防止模块内部的杂散光泄漏到接收端引起光噪声,从而降低误码率。

防止外部光线射入:在某些封装结构中,黑色PI膜用于覆盖透光缝隙,防止外部环境光干扰光模块内部的高灵敏度光电转换过程。

2. 耐高温性能

适应严苛的热环境高速光模块在工作时功耗大,内部温度往往很高。普通塑料薄膜在高温下会熔化、变形或释放挥发性有机物(VOCs),污染光学镜头。PI膜本身具备良好的耐热性(可长期在200-260℃下工作,短期可耐更高温度),能够完美适应光模块内部的高温环境以及波峰焊/回流焊等制造工艺。

3. 电气绝缘与防静电

可靠的绝缘层黑色PI膜保留了聚酰亚胺出色的电气绝缘性能,常用于电路板(PCBA)与金属外壳、或者不同元器件之间的绝缘隔离,防止高频信号短路。

防静电功能:部分黑色PI膜在制造时加入了特殊的导电碳黑或其他填料,使其具备一定的防静电(ESD)功能。

4. 辅助散热与电磁屏蔽(EMI

热管理辅助:虽然PI膜本身导热率一般,但黑色表面具有较高的热辐射系数。在某些设计中,它被用作导热界面材料的载体或辅助散热涂层。

电磁屏蔽:带有导电特性的黑色PI膜可以吸收或反射部分电磁波,辅助减少模块内部高频电路产生的电磁干扰(EMI),保证高速信号(如56G/112G PAM4信号)的完整性。

黑色聚酰亚胺薄膜遮光性能评价方法

光学密度(Optical Density,OD)是表征黑色PI膜遮光性能的常用光学参数,OD值越高,黑色PI膜遮光性能越高,防止高速光模块内部的杂散光泄漏到接收端引起光噪声,从而降低误码率。在黑色PI膜材研发中,在需要高OD值(如>4.0)的同时,同时保持高的体积电阻率和介电强度是研究重点。 

测试步骤

光学密度(OD值):使用Labodorf 351C透射密度计测量

1.连接电源开机后用出厂随机标准光密度片进行调零校准,3点标准片OD值测量确认无误后,光密度仪准备完毕。

2.将黑色PI膜放到测量孔上方,按下测量臂,即得黑色PI膜样品OD值。

点个关注,为您持续分析显示材料、半导体、PCB材料和功能性涂层行业的行业资讯与研究前沿。

文末福利

关注上方公众号,搜索PI”索取GB/T 14709-2017标准全文

延伸阅读

透射光密度怎么测,它的标准是什么?

彩色光刻胶研发工艺及光学性能测试实验指南

黑色光刻胶研发工艺及遮光性能评价实验指南

参考资料

1.GB/T 13542.6-2006:《电气绝缘用薄膜 第6部分:电气绝缘用聚酰亚胺薄膜》

2.GB/T 14709-2017:《挠性印制电路用涂胶聚酰亚胺薄膜》

3.IPC-4202Flexible Base Dielectrics for Use in Flexible Printed Circuitry(柔性印制电路用柔性基底电介质)

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  1. CONNECT:[ UseTime:0.000666s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000875s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000553s ]
  6. SELECT * FROM `set` [ RunTime:0.000240s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000644s ]
  8. SELECT * FROM `article` WHERE `id` = 618036 LIMIT 1 [ RunTime:0.000768s ]
  9. UPDATE `article` SET `lasttime` = 1778653359 WHERE `id` = 618036 [ RunTime:0.017803s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000389s ]
  11. SELECT * FROM `article` WHERE `id` < 618036 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000613s ]
  12. SELECT * FROM `article` WHERE `id` > 618036 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000455s ]
  13. SELECT * FROM `article` WHERE `id` < 618036 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000842s ]
  14. SELECT * FROM `article` WHERE `id` < 618036 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001199s ]
  15. SELECT * FROM `article` WHERE `id` < 618036 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001210s ]
0.121439s