Understanding the Differences Between 100G QSFP28 PSM4 and CWDM4

When it comes to choosing the right 100G optical solution, how do you decide between QSFP28 PSM4 and CWDM4? Both options offer significant advantages, but the key is understanding their differences and which one aligns better with your network requirements. Let’s break it down.

What They Have in Common:

• Form Factor: Both PSM4 and CWDM4 use the QSFP28 form factor, so they fit seamlessly into the same slots in your network equipment.
• Data Rate: Each supports a 100Gbps data rate, providing the high-speed connectivity essential for modern data centers.
• Primary Use: These modules are both popular for data center interconnects, handling high-density and high-bandwidth environments.

Key Differences:

• Operating Principle:
  • PSM4: Relies on parallel single-mode fibers, with four fibers for transmitting and four for receiving.
  • CWDM4: Uses coarse wavelength division multiplexing, combining four different wavelengths on a single fiber.
• Optical Interface:
  • PSM4: Uses an MPO connector with an 8-fiber parallel interface.
  • CWDM4: Employs a duplex LC connector with a single-mode fiber interface.
• Center Wavelengths:
  • PSM4: Operates at 1310nm for all lanes.
  • CWDM4: Operates at 1270nm, 1290nm, 1310nm, and 1330nm.
• Transmission Distance:
  • PSM4: Supports up to 500 meters, making it ideal for short to medium-range connections within a data center.
  • CWDM4: Extends up to 2 kilometers, which is perfect for longer intra-data center links.
• Application Scenarios:
  • PSM4: Cost-effective for shorter distances with dense fiber deployment.
  • CWDM4: Suited for longer distances, offering scalability with fewer fibers.
• Cost Considerations:
  • PSM4: Generally more affordable due to simpler technology and shorter range.
  • CWDM4: Higher in cost, reflecting its advanced technology and extended reach.

So, which one is right for you? If you’re focused on cost and shorter distances, PSM4 might be your best bet. But if you need to cover longer distances with fewer fibers, CWDM4 could be the better choice. What’s your take?

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