Cisco QDD-2X400G-FR4 Compatible 800G QSFP-DD 2FR4 Optical Transceiver Module | HYTOPTODEVICE

Product Detail：
HYTOPTODEVICE 800G QSFP-DD Transceiver | Cisco Compatible 2x400GBASE-FR4 Optical Transceiver Module(SMF, 1310nm, 2km, Dual Duplex LC, DOM)

      The QDD-2X400G-FR4 is a high-performance Cisco compatible 800G optical transceiver, engineered for next-generation 800G Ethernet, Data Center Interconnect (DCI), and InfiniBand Interconnects. It is a Dual-Port 2x400G FR4 module,QSFP-DD form factor.Each of the two 400G ports utilizes Coarse Wavelength Division Multiplexing (CWDM) technology to multiplex 4 lanes of 100G PAM4 optical signals over a single duplex LC fiber pair (wavelengths: 1271nm, 1291nm, 1311nm, and 1331nm). scaling the reach up to 2km. Fully compliant with the QSFP-DD MSA, 100G Lambda MSA, and IEEE 802.3ck standards. It features a specialized Dual Duplex LC connector interface with single-mode fiber(SMF).Real-time DOM supported.

Full Compatibility List and Supported Devices of  Cisco 800G Transceiver

This module is 100% pre-programmed and rigorously tested to ensure complete compatibility with Cisco’s NX-OS or IOS-XR platforms, delivering plug-and-play interoperability with Cisco 800G networks:

• Cisco Nexus 9000 Series Data Center Switches:

  • Nexus 9364E-SG2

  • Nexus 9332D-H2R

  • Nexus 9808 / 9804 Modular Chassis (equipped with high-density 800G line cards)

• Cisco 8000 Series Routers:

  • Cisco 8111-32EH (32-port 800G fixed router)

  • Cisco 8200 / 8800 Series edge and core routers

• Cisco NCS (Network Convergence System):

  • NCS 1004 / 1014 Series transport transponder arrays

Primary Application Scenarios of 800G OSFP Optical Transceiver

• Data Center Interconnect (DCI) & Enterprise Campuses: Ideal for bridging building-to-building or row-to-row connections spanning up to 2km, where short-reach (500m) DR4 optics cannot reach.

• High-Density 400G Switch-to-Switch Aggregation: Allows cloud operators to maximize chassis density by aggregating two independent 400G switches back to an 800G core switch using standard, low-cost duplex LC fiber patches rather than complex multi-fiber cabling.

• Fiber Infrastructure Optimization: Minimizes structural fiber deployment costs. By utilizing CWDM to carry 400G over just 2 fibers (1 Tx / 1 Rx), it saves substantial fiber plant resources compared to parallel optic alternatives.

• Hyperscale Cloud Backbones: Provides the massive throughput and reach required for core, distribution, and spine-leaf aggregation layers in large-scale cloud ecosystems.

Key Product Parameters of 800G 2FR4 Transceivers

Connectivity Solutions for 800G Optical Transceiver

Q1: What is the exact data rate and interface layout of the Cisco QDD-2X400G-FR4?A1:It is an 800Gbps transceiver in an QSFP -DD form factor employing a dual-port (2x400G) architecture. It provides two completely independent 400Gbps FR4 logical interfaces on a single physical module.

Q2: What type of fiber connector and cabling for this 800G transceiver?A2: It features a specialized Dual Duplex LC connector interface. It uses standard single-mode fiber (SMF) duplex LC-to-LC patch cords, eliminating the need for expensive MPO breakout cables.

Q3: What is the maximum reach and optical wavelength specs for QDD-800G-2FR4?A3: It reach up to 2km over single-mode fiber(SMF) via dual duplex LC connector.It has 2x400G port, Each 400G port utilizes 4 CWDM technology(wavelengths: 1271nm, 1291nm, 1311nm, and 1331nm).

Q4: Which modulation technology does the QDD-2X400G-FR4 use?A4: The transceiver implements high-speed 100G PAM4 (Pulse Amplitude Modulation 4-level) technology across 8 electrical and 8 optical channels (2x4x100G).

Q5: Does this Cisco compatible 800G transceiver support Digital Optical Monitoring (DOM)?

A5: Yes. It supports real-time DOM monitor. Network administrators can independently monitor telemetry data—such as Tx/Rx optical power, bias current, temperature, and voltage.

Why Network Engineers Choose HYTOPTODEVICE

HYTOPTODEVICE has supplied over 5000,000 optical transceiver modules to data centers, ISPs, and enterprise networks across 100+ countries since 2011. Every module undergoes a 72-hour burn-in test and full DDM/DOM validation before shipment.

• 100% MSA-compliant modules with Cisco, Huawei,Dell,Juniper, and Arista compatibility
• ISO 9001:2015 certified manufacturing facility in Shenzhen
• Average lead time of 3–5 business days with DHL/FedEx express options
• Dedicated pre-sales engineering support for custom configurations
• Actual hardware,actual switches,actual results.we publish compatibility test video,eliminate compatibility anxiety. you can watch before you buy. 
• We can provide inspection and shipping videos to make you feel as if you are right here with the product.

"We replaced 200 Cisco-branded SFPs with HYTOPTODEVICE equivalents across our spine layer — zero compatibility issues, 40% cost reduction."— Network Architect, Tier-2 ISP, Germany

Quality Certification & Compliance：

 At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final inspection, our processes ensure global compliance and reliability.

We adhere to rigorous standards for our SFP modules and network solutions:

• ISO 9001: Certified quality management and production consistency.

• CE & FCC: Fully compliant for seamless Global Market Access.

• RoHS: Committed to environmental responsibility and hazardous material control.

• Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.

Certified Quality. Global Standards. Guaranteed Performance.

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