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AI硬件 - 001篇 - 光模块 - 02

AI硬件 - 001篇 - 光模块 - 02
书接上文,本文重点梳理光模块相关的一些专业术语:QFSP、QSFP-DD、OSFP、CPO。
一、QFSP

QSFP全称Quad Small Form-factor Pluggable,即四通道小型可插拔封装,旨在用更小的体积提供更高的端口密度和传输速率。

1、核心架构:“四车道”高速路

QSFP的核心是采用四通道(4 Lanes)并行传输架构。

形象地理解,它就像一条拥有4个独立并行车道的“高速路”,每个车道能以特定速率传输数据,聚合后实现总带宽的提升。

  • QSFP (40G):最早的QSFP标准总带宽为40Gbps,每个通道速率为10Gbps。

  • QSFP28 (100G):通过将单通道速率提升至25Gbps,QSFP28在相同封装下实现了100Gbps的总带宽。

2、技术规格与演进

  • 物理尺寸与接口:

    标准的QSFP模块尺寸为18.4mm×13.5mm×72mm,采用38pin连接器。

  • 版本演进:

    为了满足不断增长的带宽需求,QSFP家族衍生出多个版本,总带宽上限已到200Gbps。

二、QSFP-DD

随着数据中心流量井喷,400G乃至800G时代的到来,QSFP的四通道架构逐渐力不从心,QSFP-DD(Quad Small Form-factor Pluggable Double Density,即双密度四通道小型可插拔封装)应运而生。

1、核心创新:“双密度”与向后兼容

QSFP-DD的核心理念是在不显著改变外部尺寸的前提下,将内部电气通道数从4条翻倍为8条,并通过更先进的PAM4调制技术让单通道速率大幅提升,从而实现总带宽的倍增。

  • PAM4(4-Level Pulse Amplitude Modulation,四电平脉冲幅度调制)是一种通过单个信号携带2比特信息来提升数据传输效率的调制技术

  • 之前的NRZ (Non-Return-to-Zero)单个信号只能携带1比特信息

  • 从400G到800G,再到当前的1.6T和下一代的3.2T接口,PAM4是绝对的技术主流。

同时,它还保持了至关重要的向后兼容性:

  • 一个QSFP-DD端口可以正常插入QSFP28/QSFP+等老模块,而旧端口则无法插入新的QSFP-DD模块。

2、技术规格与优势

1)接口与尺寸:

QSFP-DD模块采用双排76针电气接口,外部尺寸与QSFP系列基本相同(约为18.35mm × 8.5mm × 89.4mm),确保了端口密度和向后兼容性。

2)速率与功耗:

  • 400G:采用 8 × 50Gbps PAM4 配置,实现400Gbps带宽。

  • 800G:采用更先进的 8 × 100Gbps PAM4 配置,可提供高达800Gbps的带宽。

3)功耗设计:

为应对高速率带来的散热挑战,QSFP-DM模块功耗设计通常在12W-15W甚至更高,功耗控制是核心技术难点。

三、OSFP

1、什么是OSFP?

OSFP(Octal Small Form-factor Pluggable,八通道小型可插拔封装),是一种专门为400G、800G乃至未来1.6T超高速网络设计的全新封装标准。

OSFP全称中的“Octal”意为“八”,直接点明了它的核心特征:拥有8个高速电气通道。它的设计理念就是 “性能优先”,通过更大的物理尺寸,为高带宽、高功耗的光模块提供了充足的散热和供电能力。

2、OSFP的核心特性与技术演进

OSFP的优势建立在几个关键特性之上:

  • 高性能架构:

    其标准演进本身就证明了它超前的设计。

    从最初定义的400G、800G(OSFP 4.0规范),到目前已明确规划支持1.6T(OSFP 5.0规范)。

  • 强大的散热与功耗:

    更大的体积(约22.5mm宽)为优秀散热提供了物理基础,能支撑更高的功耗。

    最新规范中模块功耗已达到15-20W,且下一代1.6T OSFP模块有望支持超过30W的功率,确保了其在AI等高负载场景下稳定运行。

  • 向后兼容的折衷方案:

    由于物理尺寸和电气接口完全不同,OSFP无法与QSFP系列模块直接互插。不过,市场上存在OSFP转QSFP-DD的被动适配器,可在端口层面实现一定程度的兼容。

3、QSFP、QSFP-DD和OSFD的对比

将QSFP和OSFP做简单对比:

如果说QSFP是严谨务实的工程师,那OSFP更像一个专注于突破性能极限的“极客”,专为应对AI算力集群等顶尖场景而生。

QSFP / QSFP-DD / OSFP 光模块核心性能参数对比表
对比维度
QSFP (含QSFP+/QSFP28/QSFP56)
QSFP-DD
OSFP
封装全称
Quad Small Form-factor Pluggable(四通道小型可插拔)
Quad Small Form-factor Pluggable - Double Density(四通道小型可插拔-双密度)
Octal Small Form-factor Pluggable(八通道小型可插拔)
标准规范
SFF-8436 (QSFP+), SFF-8665 (QSFP28), SFF-8679 (QSFP56)
SFF INF-8628
SFF INF-8629
电气通道数
4通道
8通道(兼容4通道模式)
8通道
单通道速率能力
QSFP+: 10Gbps NRZ; QSFP28: 25Gbps NRZ; QSFP56: 50Gbps PAM4
50Gbps PAM4(最高支持100Gbps PAM4)
50Gbps PAM4(原生支持100Gbps PAM4,可升级至200Gbps PAM4)
总带宽能力
QSFP+: 40Gbps; QSFP28: 100Gbps; QSFP56: 200Gbps
400Gbps (8×50G PAM4) / 800Gbps (8×100G PAM4)
400Gbps (8×50G PAM4) / 800Gbps (8×100G PAM4) / 1.6Tbps (8×200G PAM4)
外形尺寸
标准QSFP尺寸,行业通用紧凑型设计
与标准QSFP完全一致,兼容原有QSFP插槽
略大于QSFP/QSFP-DD,内部空间更充足
典型功耗范围
QSFP28: 1.5W~3.5W; QSFP56: 3W~6W
400G: 10W~15W; 800G: 15W~18W
400G: 12W~18W; 800G: 18W~25W; 1.6T: 25W+
散热能力
基础散热设计,适配低功耗场景
中等散热能力,适配主流数据中心散热环境
优异散热能力,更大散热片、更优风道设计,支持液冷方案
向下兼容性
兼容SFP/SFP+/SFP28/SFP56(需适配器),同系列前后向兼容
完全兼容QSFP+/QSFP28/QSFP56,可直接插入原有QSFP插槽
不兼容QSFP系列封装,需专用插槽,无法与QSFP/QSFP-DD混插
光接口类型
LC双工、MTP/MPO-12
LC双工、MTP/MPO-16
LC双工、MTP/MPO-16
典型应用场景
企业网络、数据中心TOR/Leaf层、10G/25G/100G/200G以太网、InfiniBand FDR/EDR
云数据中心、企业网络升级、400G/800G以太网、AI集群互联、DCI互联,需兼容原有QSFP基础设施的场景
超大规模AI/超算集群、800G/1.6T超高速网络、核心交换机Spine层、对散热和带宽升级有高要求的场景
技术成熟度
极高,行业通用标准,产业链最成熟,成本最低
高,400G阶段已规模商用,800G方案逐步成熟,兼容性优势明显
中高,800G阶段开始规模商用,1.6T方案领先,面向未来超高速网络设计
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  1. CONNECT:[ UseTime:0.000696s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000587s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002666s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003434s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000575s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000564s ]
  8. SELECT * FROM `article` WHERE `id` = 722698 LIMIT 1 [ RunTime:0.000729s ]
  9. UPDATE `article` SET `lasttime` = 1780798330 WHERE `id` = 722698 [ RunTime:0.005652s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 722698 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000431s ]
  12. SELECT * FROM `article` WHERE `id` > 722698 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000353s ]
  13. SELECT * FROM `article` WHERE `id` < 722698 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001270s ]
  14. SELECT * FROM `article` WHERE `id` < 722698 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000816s ]
  15. SELECT * FROM `article` WHERE `id` < 722698 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000913s ]
0.174927s