Juniper Networks QDD-400G-LR4-10 Compatible 400GBASE-LR4 QSFP-DD PAM4 1310nm 10km DOM Duplex LC/UPC SMF Optical Transceiver Module

The Juniper Networks QDD-400G-LR4-10 Compatible 400GBASE-LR4 QSFP-DD optical transceiver is a high-performance, long-reach module designed for 400G Ethernet over single-mode fiber (SMF).

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Advantages

✅ Long-reach 10km capability (ideal for metro networks, DCI, and enterprise backbones).
✅ Duplex LC/UPC connector (simpler fiber management than MPO).
✅ PAM4 efficiency (doubles bandwidth per lane vs. NRZ).
✅ Low power consumption for a 400G LR4 module (<12W).
✅ Juniper-compatible (works with Juniper switches/routers supporting QSFP-DD 400G).

General Specifications
✔ Data Rate: 400 Gbps (4x 100G PAM4 lanes).
✔ Form Factor: QSFP-DD (Quad Small Form-Factor Pluggable Double Density).
✔ Wavelength: 1310nm (4x CWDM lanes: ~1295nm, ~1300nm, ~1305nm, ~1310nm).
✔ Modulation: PAM4 (4-level Pulse Amplitude Modulation) for high spectral efficiency.

Optical Interface & Distance
✔ Fiber Type: Single-Mode Fiber (SMF, OS2 recommended).
✔ Connector: Duplex LC/UPC (standard for LR4/LR8 applications).
✔ Transmission Distance: Up to 10km (compliant with IEEE 802.3cu standard).

Power & Performance
✔ Power Consumption: Typically < 12W (varies by vendor).
✔ DOM Support: Yes (Digital Diagnostic Monitoring) for real-time temperature, voltage, and optical power monitoring.
✔ Operating Temperature: 0°C to 70°C (commercial range).

Compliance & Standards
✔ IEEE 802.3cu (400GBASE-LR4).
✔ QSFP-DD MSA compliant.
✔ RoHS & CE certified.

✔ Data Center Interconnects (DCI) over 10km.
✔ Metro & campus network uplinks.
✔ High-capacity backbone networks.
✔ Juniper QFX Series, MX Series, and PTX Series routers.

Compatibility Notes
✔ Juniper switches/routers with QSFP-DD 400G ports (e.g., PTX1000, QFX5220, MX304).
✔ Third-party compatible versions available (ensure MSA compliance for interoperability).
✔ Can sometimes operate in 2x 200G breakout mode (check vendor specs).

FAQ

Q: Is this module compatible with non-Juniper switches?
A: Yes, if the switch supports 400GBASE-LR4 QSFP-DD (e.g., Cisco, Arista, Nokia).

Q: Can I use this with 100G-LR4 optics?
A: No, this is a 400G-only module. For 100G, use a QSFP28 LR4 or breakout cable.

Q: What’s the difference between LR4 and FR4?
A: LR4 = 10km, FR4 = 2km. FR4 is cheaper but for shorter distances.

Q: Does this support DDM/DOM?
A: Yes, most 400G-LR4 modules include digital diagnostics.