400G QSFP-DD
400GBASE-ER4 QSFP-DD 40km Optical Transceiver
400GBASE-ER4 QSFP-DD optical transceiver for up to 40km over duplex single-mode fiber, with four-lane PAM4 optics, host FEC and DDM/DOM.
Collection
Products
Browse optical transceivers and connectivity products by data rate, reach and deployment scenario.
400G QSFP-DD
2 products
View product
400G QSFP-DD
400GBASE-DR4 QSFP-DD 500m Optical Transceiver
400GBASE-DR4 QSFP-DD optical transceiver for up to 500m over parallel single-mode fiber, with a 1310nm interface, MPO-12 APC and host FEC.
Recommended articles
Guides for choosing well
Buying guides, material notes, and stories for choosing with more confidence.
Sep 21, 2026Network Deployment
400G ZR+ vs. a Mid-Span Site: How to Solve Fiber Links Over 40 km
Link too long for standard optics? Compare 400G ZR+ and 100G ZR coherent optics with building a mid-span cabinet or fiber hut: cost, reach, link budget and port compatibility.
Sep 1, 2026Optical Transceiver Guide
Mixed-Vendor Optics BOM: What to Record Before You Request a Quote
Build a mixed-vendor optics BOM with exact hosts, ports, OEM references, link requirements, coding evidence, quantities, spares and validation status.
Aug 31, 2026Optical Transceiver Guide
From OEM Part Number to Compatible Replacement: An Optics Equivalence Worksheet
Map an OEM optical transceiver part number to a compatible replacement by verifying host coding, interface, wavelength, reach, fiber, connector and validation.