Cisco QSFP-100G-CWDM4-S= 100G QSFP28 CWDM4 optical transceiver

🚀 Cost-Effective 100G SMF Connectivity for 2km | Cisco QSFP-100G-CWDM4-S=

The Industry-Standard 100G Solution for Scalable Data Centers

The Cisco QSFP-100G-CWDM4-S= is a high-performance 100G QSFP28 optical transceiver designed for medium-reach transmission over single-mode fiber (SMF).

Operating on CWDM wavelengths around 1310nm, it supports transmission distances up to 2km, making it one of the most widely adopted 100G optical modules in modern data center interconnects.

Engineered by Cisco Systems, this module offers a perfect balance between cost, performance, and deployment flexibility.

🔥 Why This Module Is So Popular

✔ Need reliable 100G up to 2km ✔ Looking for a standard SMF solution ✔ Want a balance between cost and performance

👉 CWDM4 = the most widely deployed 100G SMF solution

⚡ SR4 vs SM-SR vs CWDM4 vs DR

Type	Fiber	Distance	Connector	Architecture
SR4	MMF	≤100m	MPO	Parallel
SM-SR	SMF	100–500m	LC	Simplified SMF
CWDM4	SMF	≤2km	LC	CWDM
DR	SMF	500m	LC	PAM4

👉 CWDM4 = longer reach + stable + cost-effective standard

🧠 Key Features of Cisco QSFP-100G-CWDM4-S=

Data Rate: 100 Gbps

Wavelength: CWDM (1271 / 1291 / 1311 / 1331 nm)

Distance: Up to 2 km

Connector: LC Duplex

Fiber Type: Single-mode fiber (SMF)

Form Factor: QSFP28

Digital Optical Monitoring (DOM): Supported

Hot-swappable

Low power consumption

🏗️ High-Value Application Scenarios

1. Data Center Interconnect (DCI)

Up to 2km reach

Stable and cost-efficient

2. Leaf-Spine Architecture

Spine-to-leaf connections

High bandwidth aggregation

3. Enterprise & Cloud Data Centers

Standardized SMF deployment

Easy scaling

4. Campus Networks

Building-to-building 100G links

💡 Why Choose CWDM4?

👉 Traditional choices:

SR4 → short distance + MPO complexity

DR → limited to 500m

👉 CWDM4 offers:

Longer reach (2km)

LC fiber simplicity

Mature ecosystem

Lower cost per link (vs LR4)

✅ Best for large-scale 100G SMF deployment

🧩 Complete 100G SMF Solution

✅ Optical Modules

Cisco QSFP-100G-CWDM4-S=

Cisco QSFP-100G-DR-S= (for shorter 500m scenarios)

✅ Cabling

LC-LC single-mode fiber (OS2)

✅ Equipment

100G switches

Leaf-spine architecture

👉 CWDM4 = mainstream 100G SMF infrastructure

📊 Technical Specifications

Parameter	Specification
Form Factor	QSFP28
Data Rate	100 Gbps
Wavelength	CWDM (1271–1331 nm)
Max Distance	2 km
Connector	LC Duplex
Fiber Type	Single-mode
Power Supply	3.3V
Operating Temp	0°C to +70°C
DOM Support	Yes
Compliance	QSFP28 MSA, RoHS

❓ FAQ

Q1: What is CWDM4 used for?

It is used for 100G transmission over single-mode fiber up to 2km.

Q2: Is CWDM4 better than SR4?

Yes, it supports longer distance and uses LC instead of MPO, simplifying cabling.

Q3: What is the difference between CWDM4 and LR4?

CWDM4 is more cost-effective for 2km, while LR4 supports up to 10km at a higher cost.

Q4: What fiber is required?

Standard OS2 single-mode fiber.

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🚀 Get a Quote for Your 100G Deployment

👉 Planning a scalable 100G SMF network?

✔ 2km reliable transmission ✔ Standardized deployment ✔ Cost-effective scaling