単一モードファイバー展開におけるQSFP28 100G CWDM4とLR4の比較

How to choose between QSFP28 100G CWDM4 and LR4 modules for your data center? These two dominant 100G光トランシーバー
standards look similar but have critical differences impacting cost, reach, and infrastructure. This guide cuts through the complexity, empowering you to make the 完璧な, cost-effective choice for your high-speed links.

➤ 主なポイント

を選んでください。都市内ネットワークや大規模キャンパスではコスト削減になります。
100G CWDM4 modules for short or medium distances ファイバーの節約が極めて重要である場合. These modules help you save money and use less power. They still give good performance.
使用する際は 100G LR4 modules for long distances 10km. These modules give strong and reliable signals. You need to spend more for them.
Check if your network equipment works with the modules before you buy. Make sure the modules fit your switches and routers.
Think about how far your network needs to go and your budget. Pick the module that matches your needs now and in the future.
Know that CWDM4 uses direct modulation lasers and needs error correction. LR4 uses external modulation lasers for longer reach and may not always need error correction.

➤ Understanding the Core Technologies

どちらも、 QSFP28 CWDM4 および QSFP28 LR4 are hot-pluggable, 100GBase transceivers using four 25Gbps lanes. Their core divergence lies in 波長多重化 および リンク予算:

QSFP28 100G CWDM4 Transceiver (100GBase-CWDM4):
- 波長： Uses four wavelengths within the Coarse Wavelength Division Multiplexing （CWDM）
  grid: approximately 1271nm, 1291nm, 1311nm, and 1331nm.
- 到達距離： 高速なローカルLANトラフィックに最適化 up to 2 km over standard シングルモードファイバ （SMF）.
- 主な利点：
  コスト効率. Leverages wider channel spacing, allowing simpler (cheaper) lasers and optics. Crucial for 高密度データセンター deployments where 消費電力 および optic module price が極めて重要です。.
- Fiber Usage: デバイスおよびネットワークを識別するために dual single-mode fiber (SMF) strands (one for Tx, one for Rx) – a pair of fibers.
QSFP28 100G LR4 Transceiver (100GBase-LR4):
- 波長： Uses four tightly packed wavelengths around the 1310nm window (1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm) based on LAN-WDM 技術を採用しています。.
- 到達距離： Designed for longer distances, supporting 最大10 kmです over standard 光は長距離通信向けの.
- Key Advantage: Reach. Essential for connecting キャンパスネットワーク, メトロイーサネット, or linking disaggregated data center buildings.
- Fiber Usage: Also uses dual single-mode fiber (SMF) strands (one for Tx, one for Rx).

➤ Head-to-Head Comparison: CWDM4 vs LR4

Here’s a clear breakdown of the critical differences:

機能	QSFP28 100G CWDM4	QSFP28 100G LR4
標準	100GBase-CWDM4 (IEEE) / MSA	100GBase-LR4 (IEEE 802.3bm Clause 88)
Wavelength Grid	CWDM (~1271, 1291, 1311, 1331 nm)	LAN-WDM (~1295, 1300, 1304, 1309 nm)
最大伝送距離	2 km	10 km
光ファイバータイプ	シングルモードファイバ（SMF）	シングルモードファイバ（SMF）
ファイバー数	2本のファイバー (1 Tx pair, 1 Rx pair) ✅	2本のファイバー (1 Tx pair, 1 Rx pair)
一般的なコスト	低い (Simpler lasers & optics) 💰	高い (Tighter tolerances & reach)
消費電力	通常低い (< 3.5W) 🔋	通常やや高価 (≤ 3.5W)
主な用途	Short-Reach Data Center Interconnects (DCI), Top-of-Rack (ToR) to Leaf	Longer-Reach DCI, Metro, Campus Links, Leaf to Spine/Core
MSA Compliance	CWDM4 MSA	IEEE 802.3bm
相互運用性	Not directly interoperable with LR4 ❌	Not directly interoperable with CWDM4 ❌
主な推進要因	Cost Optimization, Power Efficiency	Reach Requirement

➤ Why the Reach Difference Matters (And When Cost Wins)

この 2km reach of CWDM4 transceiver is often perfect within modern ハイパースケール・データセンター. If your links connect racks within a row or adjacent rows in the same hall, CWDM4 delivers significant savings 点滅 optic module cost without sacrificing performance. This makes it the go-to choice for high-volume data center deployments prioritizing 全体的な所有コスト（TCO）. LINK-PP’s LQ-CW100-FR4C
is a market leader here, offering reliability at an optimal price point.

この 10km reach of LR4 module is indispensable when connecting across buildings, to a central office, or within a メトロネットワーク. While the optic module price is higher due to more precise laser requirements, it eliminates the need for potentially expensive reach extenders or additional network hops for these longer distances. For robust, future-proofed long distance fiber optic transmission, LINK-PP’s LQ-LW100-LR4C provides the necessary performance.

✅ Key Takeaways & Which One to Choose

Need ≤ 2km within a data center? Choose CWDM4. It’s the コスト効率の高い, power-efficient workhorse for に不可欠な製品を設計・製造しています。, webscale networking, および enterprise data center spine-leaf architectures. Maximize your budget without compromise.
Need up to 10km (campus, metro, inter-building)? Choose LR4. Its longer reach is non-negotiable for these scenarios, justifying the higher optic module price. の伝送を実現します。以下のような用途に不可欠です。 telecom applications および extended data center interconnects.
互換性 CWDM4 and LR4 modules are NOT plug-and-play compatible. Ensure both ends of a link use the 同じ technology (CWDM4-CWDM4 or LR4-LR4).
Fiber Infrastructure: Both require standard single-mode fiber patch cables. The choice doesn’t impact your underlying fiber plant type, only the reach it enables.

➤ LINK-PP: Your Partner for High-Performance 100G Optics

Whether you need the cost-optimized efficiency を CWDM4 for massive data center scaling or the 拡張された伝送距離
を LR4 向け metro connectivity, LINK-PP delivers reliable, high-quality QSFP28 solutions. Our 100G CWDM4 および 100G LR4 modules are rigorously tested for seamless 100g qsfp28 integration and performance.

Ready to Optimize Your 100G Network? ✉️
Consult with LINK-PP experts today! We’ll help you select the perfect 100g transceiver – whether it’s CWDM4, LR4, or other cutting-edge 光ファイバーモジュール – ensuring maximum performance, reliability, and value for your specific スイッチング： 要件によって異なります。. Get a quote or request samples now ➞

➤ よくあるご質問（FAQ）

What is the main difference between 100G CWDM4 and 100G LR4?

You will find that CWDM4 works best for short to medium distances, up to 2km. LR4 supports longer distances, up to 10km. LR4 uses stronger lasers and costs more.

Do I need special equipment for CWDM4 or LR4 modules?

Most modern switches and routers support CWDM4. LR4 sometimes needs special gear for long distances. Always check your device’s compatibility before you buy.

Why does CWDM4 require FEC?

CWDM4 needs 前方誤り訂正（FEC） to fix errors during data transmission. FEC helps keep your data safe and reliable, especially over longer links.

Can I use CWDM4 and LR4 modules together in one network?

You can use both types in the same network if your equipment supports them. Make sure each link uses the right module for its distance and requirements.

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