100G QSFP28 CWDM4 Optical Transceiver – 2km Reach, 4x25G, DDM Support
1. Product Overview
The 100G QSFP28 CWDM4 Optical Transceiver (CC-QKKCC0L-SD) is a high-performance, hot-pluggable optical module designed for 100 Gigabit Ethernet applications. It complies with the CWDM4 MSA standard and supports data transmission up to 2km over single-mode fiber (SMF). The transceiver utilizes four CWDM lanes in the 1270–1330nm range and features digital diagnostics monitoring (DDM) for real-time performance tracking. It is ideal for data centers, enterprise networks, and high-performance computing environments.
2. Key Characteristics
- Data rate: 4x25.78125 Gbps (100G Ethernet)
- Reach: Up to 2km over single-mode fiber
- Wavelengths: 1271nm, 1291nm, 1311nm, 1331nm
- Power consumption: ≤3.5W
- Operating temperature: 0°C to 70°C
- Hot-pluggable QSFP28 form factor
- Digital Diagnostic Monitoring (DDM)
- RoHS compliant
3. Technology & Standards
The transceiver is built on CWDM technology and complies with:
- 100G CWDM4 MSA Specification
- IEEE 802.3bm 100GBASE-LR4
- QSFP28 MSA Hardware Rev 4.1
- IEC 60825-1 Laser Safety Class 1
- RoHS 6/6 Compliance
4. Working Principle
The module converts four electrical lanes of 25.78125 Gbps into four CWDM optical signals using uncooled distributed feedback (DFB) lasers. The optical signals are multiplexed into a single fiber for transmission. At the receiver end, a demultiplexer separates the wavelengths, which are then converted back to electrical signals by PIN photodiodes. Integrated CDR circuits ensure signal integrity across the 2km link.
5. Applications
- Data center interconnects and backbone
- High-speed Ethernet switches and routers
- Server and storage area networks (SAN)
- High-performance computing clusters
- Network load balancers and hubs
6. Specifications
| Parameter | Value | Unit |
| Data Rate | 4x25.78125 | Gbps |
| Max Distance | 2 | km |
| Wavelengths | 1271/1291/1311/1331 | nm |
| Power Consumption | ≤3.5 | W |
| Supply Voltage | 3.3 | V |
| Operating Temperature | 0 to +70 | °C |
| Connector | Dual LC | - |
| DDM Support | Yes | - |
7. Advantages & Selling Points
- Cost-effective alternative to 100G LR4 solutions
- Uncooled CWDM technology reduces power consumption
- Comprehensive digital diagnostics for real-time monitoring
- Wide operating temperature range for data center use
- Full compliance with CWDM4 MSA ensures interoperability
8. Service & Support
All transceivers come with a 5-year warranty and lifetime technical support. We offer global shipping with DHL/FedEx options. Custom labeling and compatibility testing services are available for bulk orders.
9. FAQ
Q: What is the difference between CWDM4 and LR4?
A: CWDM4 uses coarse wavelength division multiplexing with wider channel spacing, making it more cost-effective for 2km applications compared to LR4.
Q: Does this transceiver support digital diagnostics?
A: Yes, it provides full DDM functionality for monitoring temperature, voltage, TX power, RX power, and laser bias current.
Q: What type of fiber is required?
A: Single-mode fiber (SMF) with OS2 specification is recommended for optimal performance.
10. Precautions
- Use only with single-mode fiber (SMF)
- Avoid bending fiber beyond minimum bend radius
- Keep optical connectors clean to prevent signal degradation
- Observe ESD precautions during handling and installation
- Do not operate beyond maximum rated temperature
11. Company Introduction
starsurge has over 10 years of experience in the optical transceiver industry. We specialize in manufacturing high-quality network cards, optical transceivers, and networking equipment. Our products are used in data centers, enterprise networks, and telecommunications infrastructure worldwide. We maintain large inventory levels and offer competitive pricing with comprehensive technical support.
