Juniper 80KM Transceiver Module (QDD-400G-ZR-S)

Overview of Juniper QDD-400G-ZR-S 400G 80KM Coherent Transceiver

The Juniper QDD-400G-ZR-S is presented as a high-performance 400Gbps coherent QSFP-DD optical transceiver for long-distance single-mode fiber networking. It is intended for applications such as data-center interconnect (DCI), metro networking, high-capacity backbone links, and other environments where very high bandwidth must be transported across significantly longer fiber distances.

The QDD-400G-ZR-S naming corresponds to a 400G coherent 16-QAM optical module documented publicly by Cisco, while Juniper's current official Pathfinder catalog identifies its standard 400ZR module as QDD-400G-ZR, part number 740-114884. Juniper specifies that QDD-400G-ZR is an OIF 400ZR-compliant 400GE coherent optical module with a Duplex LC PC/UPC connector and QSFP-DD form factor. :contentReference[oaicite:1]{index=1}

Juniper's 400G optical documentation describes 400ZR as a coherent technology intended for long-distance data-center interconnects and metro/regional networks. The current Juniper guide states that 400ZR applications can reach up to approximately 120km, depending on the optical system and link conditions. :contentReference[oaicite:2]{index=2}

For this reason, the exact QDD-400G-ZR-S designation and the advertised 80KM reach should be verified against the physical label, manufacturer part number, and target Juniper platform before purchase.

Why Choose a 400G ZR Coherent Transceiver?

• 400Gbps high-capacity optical networking.
• Coherent optical transmission for extended distances.
• QSFP-DD compact pluggable form factor.
• Single-mode fiber operation.
• Duplex LC optical interface.
• 16-QAM coherent modulation.
• Suitable for data-center interconnects.
• Suitable for metro and regional network applications.
• High bandwidth with relatively compact port density.
• Digital optical monitoring on supported Juniper 400ZR implementations.

Technical Specifications

*Important SKU note: Juniper's current official Pathfinder identifies QDD-400G-ZR, part number 740-114884, as its OIF 400ZR module. The exact QDD-400G-ZR-S designation is publicly documented by Cisco, so the manufacturer and exact part number should be verified before purchase. The 80KM figure should likewise be confirmed for the supplied SKU. :contentReference[oaicite:3]{index=3}

400Gbps Coherent Optical Connectivity

The QDD-400G-ZR-S belongs to the class of 400G coherent optical transceivers designed to transport massive amounts of Ethernet traffic over single-mode fiber. Compared with short-reach SR/DR optics, coherent ZR technology is intended for significantly longer network spans.

Juniper describes 400ZR as an OIF-standard solution for transporting 400GbE over long distances, with data-center interconnect being one of its primary applications. :contentReference[oaicite:4]{index=4}

80KM Long-Distance Application

The supplied product description identifies the QDD-400G-ZR-S as an 80KM transceiver. This type of reach makes the optic appropriate for long-distance links between data centers, network facilities, metro aggregation points, and other geographically separated locations.

Actual achievable distance depends on fiber characteristics, optical line system, amplification, dispersion, OSNR, connector losses, channel plan, and network configuration. Juniper's standard QDD-400G-ZR documentation specifies up to approximately 120km for 400ZR applications, so the exact 80KM rating should be tied to the specific SKU being supplied. :contentReference[oaicite:5]{index=5}

16-QAM Coherent Modulation

Coherent 400G ZR technology uses advanced modulation to achieve high capacity over long fiber spans. The QDD-400G-ZR-S specifications published by Cisco identify 16-QAM at 400G, while Juniper's JCO400-QDD-ZR documentation also specifies DP-16 QAM for its 400ZR implementation. :contentReference[oaicite:6]{index=6}

Coherent modulation allows the transceiver to compensate for and monitor optical impairments that are important in long-distance transmission, making it fundamentally different from conventional short-reach multimode or direct-detect 400G optics.

Single-Mode Fiber & Duplex LC

The Juniper QDD-400G-ZR uses single-mode fiber and a Duplex LC PC/UPC connector. This makes it suitable for existing single-mode fiber infrastructure and optical transport systems designed for long-distance Ethernet connectivity. :contentReference[oaicite:7]{index=7}

Tunable DWDM Technology

400ZR coherent optics are designed around tunable DWDM technology. Juniper's documentation specifies C-band tunability and support for 75GHz and 100GHz channel spacing, allowing the optical module to operate on appropriate DWDM wavelengths within supported channel plans. :contentReference[oaicite:8]{index=8}

This makes ZR optics particularly useful in optical transport environments where multiple high-capacity wavelengths share the same fiber infrastructure.

Data Center Interconnect Applications

One of the primary applications of 400ZR technology is Data Center Interconnect (DCI). The high bandwidth allows large volumes of traffic to move between geographically separated data centers without requiring a separate traditional transport platform for every connection.

• Data Center Interconnect
• Metro Data Center Networks
• Regional Data Center Connectivity
• Cloud Infrastructure
• Internet Service Provider Backbone
• Telecom Metro Networks
• High-Capacity Enterprise Backbone
• Cloud-to-Cloud Connectivity
• Network Core Interconnects
• High-Bandwidth Optical Transport

Optical Monitoring

Juniper's official QDD-400G-ZR specification includes optical monitoring capabilities. Monitoring parameters for coherent optics can include module temperature, BER, transmit and receive optical power, carrier frequency offset, chromatic dispersion, differential group delay, polarization-dependent loss, and OSNR, depending on the specific implementation. :contentReference[oaicite:9]{index=9}

These monitoring capabilities are useful for troubleshooting long-distance links and maintaining optical-network performance.

Compatibility with Juniper Platforms

Juniper's Pathfinder Hardware Compatibility Tool should always be checked before installing a 400G coherent optic. The current QDD-400G-ZR is listed as a common optic on platforms including selected ACX and QFX systems. :contentReference[oaicite:10]{index=10}

Juniper also notes that using 400ZR and 400G OpenZR+ coherent DWDM transceivers requires a corresponding feature license, and Juniper-branded coherent optics are purchased as license-inclusive bundles. :contentReference[oaicite:11]{index=11}

Benefits of Using a 400G ZR Transceiver

• 400Gbps network capacity.
• Long-distance single-mode fiber transmission.
• Suitable for approximately 80KM-class links depending on SKU and optical system.
• Coherent optical technology.
• 16-QAM modulation.
• DWDM wavelength tunability.
• Duplex LC fiber interface.
• Compact QSFP-DD form factor.
• Ideal for high-density data-center networks.
• Suitable for metro and regional optical networks.
• Advanced optical monitoring capabilities.

Buy Juniper 400G ZR Transceiver in Bangladesh

If you're looking for a Juniper-compatible 400G ZR optical transceiver for long-distance fiber networking in Bangladesh, this class of optic is designed for high-capacity data-center interconnect, metro networking, and regional backbone applications.

The combination of 400Gbps bandwidth, coherent 16-QAM technology, QSFP-DD form factor, single-mode fiber, Duplex LC interface and DWDM tunability makes 400ZR an attractive solution for high-capacity optical networks.

Important purchasing note: The exact model supplied as QDD-400G-ZR-S should be checked carefully. Public documentation identifies that exact suffix with Cisco, whereas Juniper's official current model is QDD-400G-ZR, part number 740-114884. If your intended product is specifically Juniper-branded, verify the label/part number and Juniper HCT compatibility before publishing the SKU. :contentReference[oaicite:12]{index=12}

Why Buy from Independent Tech BD?

• Genuine Networking & Optical Products
• Competitive Price in Bangladesh
• Professional Data Center Solutions
• Corporate & Project Supply
• Technical Support for High-Speed Fiber Deployment
• Nationwide Delivery
• Reliable After-Sales Service

Frequently Asked Questions (FAQ)

What is the speed of the QDD-400G-ZR-S?

The module is designed for 400Gbps Ethernet coherent optical transmission.

What is the transmission distance?

The product description identifies the QDD-400G-ZR-S as an 80KM-class transceiver. However, Juniper's current QDD-400G-ZR specification lists up to 120km for 400ZR applications, so the exact distance must be verified against the supplied SKU and optical line system. :contentReference[oaicite:13]{index=13}

What fiber type does it use?

It is designed for single-mode fiber (SMF) long-distance optical networking.

What connector does it use?

Juniper's QDD-400G-ZR uses a Duplex LC PC/UPC optical connector. :contentReference[oaicite:14]{index=14}

What modulation does the 400G ZR optic use?

The QDD-400G-ZR-S specification identifies 16-QAM coherent modulation. Juniper's JCO400-QDD-ZR implementation also uses DP-16 QAM. :contentReference[oaicite:15]{index=15}

Is this optic suitable for data-center interconnect?

Yes. 400ZR is specifically designed for high-capacity data-center interconnect, metro and regional networking applications. :contentReference[oaicite:16]{index=16}

Does it support DWDM?

Yes. Juniper's 400ZR architecture uses tunable C-band DWDM technology with 75GHz and 100GHz channel spacing. :contentReference[oaicite:17]{index=17}

Is QDD-400G-ZR-S a Juniper model?

This requires verification. The exact QDD-400G-ZR-S designation is publicly documented by Cisco, while Juniper's official Pathfinder lists QDD-400G-ZR, part number 740-114884. Therefore, the exact manufacturer and part number should be confirmed before purchase or product publication. :contentReference[oaicite:18]{index=18}