400G PAM4 測試

Fiber in 400G network

400G PAM4 測試


克服 400G 量測挑戰

隨著全球各地的雲端運算使用量快速成長,人們對於高效能資料中心基礎架構的需求量也大幅增加。 為了跟上此一強勁需求,開發人員無不轉為採用 400G 技術,以便實現更小型、更快速、更低每單位位元成本的解決方案。

有數種核心技術可支援 400G,包括使用更高階的調變和更高的資料速率 (最高 56 Gbaud)。 這項新的調變配置可提供四位準脈波振幅調變 (PAM4),其會在每個符號發射兩個位元,資料速率是傳統 NRZ 的兩倍。

PAM4 訊號 (具有較低的訊號訊雜比,且振幅是同等 NRZ 的 1/3) 需要更先進的工具和功能,才能成功完成驗證。

加快 400G 產品的開發速度

400G 產品很難開發。PAM4 訊號需要更先進的工具和功能,才能成功地進行評估。 DPO7OE 系列光學探棒 具有 DPO70000 即時示波器,可提供卓越的功能、觸發和除錯能力,以有效進行故障檢修和量測高達 56 GBaud 的 PAM4 訊號。

Tektronix 即時解決方案 可讓您有效率地事先驗證技術,並快速除錯和驗證可與低雜訊取樣示波器互補的 400G 技術。

Comparison of pulse amplitude modulation (PAM4) versus NRZ shows the increased complexity

從 NRZ 轉為採用 PAM4,會增加光學訊號的測試複雜度。


其中一項最大的挑戰是,既要讓每一裝置的測試成本盡可能地低,又要符合所要求的規格。 由於 PAM4 訊號所必須進行的測試次數比 NRZ 訊號多了 10 倍以上,您必須有雜訊最少、可快速提供量測以便進行最佳化調諧的解決方案,才能產生最大量的產出。

Tektronix 取樣解決方案包括 DSA8300 和 80C20/21 光學模組 ,在測試高達 56 GBaud 時可提供最高的頻寬、最高的靈敏度和最短的測試時間。本解決方案可讓您有效地在效能和測試成本之間取得平衡。

TDECQ is one of the PAM4 measurements

TDECQ 量測可顯示出 PAM4 訊號的測試複雜度。

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  • 重設


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Learn valuable information on testing PAM4 technology and approaches for validating PAM4 signals.  This application note describes:

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