QDD-ER4L-400G serves as a 400GBASE-ER4 optical transceiver that converts 8-lane 50Gb/s PAM4 electrical inputs into 4-lane LAN-WDM optical outputs. Equipped with an EML laser and APD photodetector, the module enables links up to 30km on single-mode fiber while providing real-time digital optical monitoring capabilities.
Key Features of Arista QDD-ER4L-400G Compatible LINK-PP 400G QSFP-DD
Arista QDD-ER4L-400G Compatible LINK-PP module is a commercial-grade 400G QSFP-DD optical transceiver module that combines LAN-WDM technology, a duplex LC interface, and digital optical monitoring. Engineered for extended reaches up to 30km over single-mode fiber, this module delivers reliable long-distance connectivity with optimized power efficiency.
This module fully complies with the QSFP-DD MSA specification, ensuring seamless mechanical and electrical compatibility with standard networking ports. Operating within a commercial temperature range (0 to 70°C), it maintains an energy-conscious profile with a maximum power consumption of 12W.
QDD-ER4L-400G: 400 Gbps Connectivity for Data Center Interconnects
A total throughput of 400Gbps easily satisfies bandwidth-intensive demands across modern cloud platforms, regional switching hubs, and metro core links. By aggregating 8x50Gbps PAM4 electrical lanes, the module provides rapid data exchange for enterprise campus backbones and data center interconnect (DCI) deployments.
QDD-ER4L-400G Module with LAN-WDM Technology for Fiber Efficiency
Integrated 4-channel LAN-WDM optical multiplexing enables multiple data streams to traverse a single fiber pair simultaneously without signal interference. This multiplexed architecture maximizes existing fiber plant utility while significantly lowering cabling overhead across metro optical spans.
QDD-ER4L-400G Module with 1295.56nm, 1300.05nm, 1304.58nm, 1309.14nm Wavelength
Four distinct optical center wavelengths - 1295.56nm, 1300.05nm, 1304.58nm, and 1309.14nm - operate tightly within the O-band window to ensure minimal chromatic dispersion. Each individual lane transmits 100Gbps optical signals cleanly across long-reach links to preserve signal integrity.
QDD-ER4L-400G Module Supporting 30km Transmission
Long-haul reach up to 30km is achieved over standard single-mode fiber using an EML laser transmitter paired with a high-sensitivity APD receiver. Such extended reach eliminates the immediate need for mid-span optical amplifiers in typical point-to-point metro routing.
QDD-ER4L-400G Module with Duplex LC Interface
Standard duplex LC connectors simplify field cable management by utilizing universal single-mode patch cords. Network technicians can complete port connections quickly while preserving physical link stability inside crowded data center racks.
QDD-ER4L-400G Module with DOM for Real-Time Monitoring
Built-in digital optical monitoring (DOM) continuously tracks critical operational metrics, including operating temperature, supply voltage, bias current, and optical transmit/receive power. Network engineers can proactively detect link degradation and troubleshoot optical faults directly through the host switch operating system.
Arista QDD-ER4L-400G Compatible LINK-PP 400G QSFP-DD holds international certifications including ISO 9001, CE, RoHS, and FCC to ensure verified manufacturing quality, operational safety, and environmental compliance.
Each transceiver module undergoes strict signal integrity checks and eye-diagram testing to guarantee stable optical performance prior to delivery.
QDD-ER4L-400G Quality Certifications
Standardized manufacturing controls ensure every optical module adheres to international environmental regulations, electrical safety, and reliability requirements.
This product is in conformity with ISO9001. This system is valid to a company engaging in development, production and supply service of fiber optical products. Please contact us to learn more.
ISO/IEC 27001 is an international standard for managing and processing information security. This standard is jointly developed by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC). It sets out requirements for establishing, implementing, maintaining, and continually improving an information security management system (ISMS). Ensuring the confidentiality, integrity, and availability of organizational information assets, obtaining an ISO 27001 certificate means that the enterprise has passed the audit conducted by a certification body, proving that its information security management system has met the requirements of the international standard. Please contact us to learn more.
This product is in conformity with ISO14001.It is intended for use by an organization seeking to manage its environmental responsibilities in a systematic manner that contributes to the environmental pillar of sustainability. Please contact us to learn more.
ISO 45001 is a global standard that sets out the requirements for an occupational health and safety management system (OH&SMS).
REACH is a European Union regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals. It came into force on 1st June 2007 and replaced a number of European Directives and Regulations with a single system. The regulation aims to protect human health and environmental safety, maintain and improve the competitiveness of the EU chemical industry, and develop innovative capabilities for non-toxic and harmless compounds to prevent market fragmentation, increase the transparency of the use of chemicals, promote non-animal experiments, and pursue sustainable social development.Please contact us to learn more.
This product meets the applicable requirements of Directive (EU) 2015/863 of RoHS. It restricts the use of 10 hazardous materials in the manufacture of various types of electronic and electrical equipment: lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ethers, and four different phthalates. Please contact us to learn more.
This product fully accords with the FCC, which aims to manage the radio wave and magnetic fields more reasonably. Please contact us to learn more.
CB is an international system operated by IECEE. This product is based on IEC standards for testing the safety performance of electrical products. Please contact us to learn more.
This product fully accords with UKCA (UK Conformity Assessed) certificate, which signifies that it meets all relevant quality standards as well as health and safety requirements. Please contact us to learn more.
UL certification is a non-mandatory certification in the United States,mainly testing and certification of product safety performance.Its ultimate purpose is to obtain products with a fairly safe level for the market,and to contribute to ensuring human health and property safety.Please contact us to learn more.
QDD-ER4L-400G Certified for Reliable Host-Device Compatibility
Comprehensive on-device verification ensures seamless plug-and-play operation and error-free port recognition across leading enterprise switches and routers.
Every QDD-ER4L-400G QSFP-DD module undergoes strict physical layer evaluations to guarantee flawless signal transmission and long-term hardware reliability across critical network links. Learn more about our comprehensive validation procedures by visiting the LINK-PP Test Support Center.
Optical Spectrum Test
Verify central operating wavelengths to prevent adjacent channel signal interference.
Eye Pattern Test
Analyze optical transmitter eye diagrams to confirm superior waveform clarity.
Bit Error Rate Test
Detect subtle transmission packet errors to ensure reliable data throughput.
Temperature Test
Monitor real-time thermal stability to maintain dependable commercial-grade operation.
Product Shipping for Arista QDD-ER4L-400G Compatible LINK-PP 400G QSFP-DD
Each QDD-ER4L-400G QSFP-DD optical module is packed with dependable protective packaging to prevent physical damage during long-distance transit. Efficient global logistics networks guarantee timely order fulfillment and smooth delivery to your project sites.
Anti-Static Protective Packaging
Shield delicate electronic components against unexpected electrostatic discharge during handling.
Shock-Resistant Transport Protection
Protect optical hardware against external impact forces during domestic transit.
Fast Order Processing and Dispatch
Prepare purchased transceiver inventory promptly to ensure immediate carrier handover.
Global Logistics and International Delivery
Deliver packaged products worldwide using trusted international express courier services.
Deploying the QDD-ER4L-400G 400G QSFP-DD module requires aligning the transceiver with the switch port, sliding it in until locked, and connecting duplex LC fiber patch cords. This straightforward procedure delivers high-density 400G connectivity across point-to-point Data Center Interconnects (DCI) spanning campus facilities and metro hubs.
QDD-ER4L-400G Technical Support
LINK-PP offers end-to-end technical support, from pre-sales consultation to post-deployment assistance, ensuring smooth integration and reliable network performance.
Pre-Sales Technical Consultation
Professional guidance to help you select the optimal QDD-ER4L-400G module for your network design and application needs.
Compatibility Verification Support
Validated compatibility with LINK-PP switches and other mainstream networking platforms for seamless deployment.
Deployment & Installation Assistance
Comprehensive step-by-step guidance for installation, configuration, and initial setup, ensuring accurate deployment and reliable, stable operation from the start.
Long-Term Technical Assurance
Ongoing technical support throughout the product lifecycle, delivering long-term stability for enterprise and carrier-grade networks.
A:
It is designed for standard optical interconnect applications, including 400G Ethernet and compatible InfiniBand environments. However, because InfiniBand gear often requires specific firmware coding and link speed matching (such as NDR/HDR profiles), please share your switch and HCA model with us first so we can verify compatibility. By
admin
A:
Yes. To achieve error-free transmission over distances up to 30km, this LQD-LW400-ER4L module requires host FEC to be enabled on your switch or router ports. The PAM4 modulation relies on Forward Error Correction to clean up noise and deliver full line-rate throughput across long fiber spans. By
admin
A:
Your host switch port must support standard 400GAUI-8, which supplies 8 electrical lanes running at 53.125Gb/s PAM4 each. The module converts these into 4 optical channels running at 106.25Gbps PAM4. By
admin
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496268
495906
E***y
Ukraine
Verified
Purchase
5 .0
2026-06-07
Our procurement team wanted a 400G optical module that could support bulk deployment without adding MPO patching complexity. These arrived consistent across the batch. Operations especially likes being able to validate TX/RX power and module temperature through DOM after installation. =)
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496268
495918
G***r
Turkey
Verified
Purchase
5 .0
2026-05-17
Ran a 24-hour RFC 2544 stress test across 25km SMF spools in the lab. Zero frame drops, clean eye diagrams, and module casing stays around 48°C under continuous load. =)
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496268
495904
S***n
Lithuania
Verified
Purchase
5 .0
2026-03-21
We integrated these transceivers into our high-performance computing cluster cross-connect across adjacent data halls. IEEE 802.3bs and OIF 56G PAM4 compliance made interoperability seamless across different whitebox switches. Low power consumption and tight duplex LC alignment make this optic an absolute workhorse for campus long-haul backbones. =D
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496268
495916
J***z
Libyan Arab Jamahiriya
Verified
Purchase
4 .0
2026-02-23
Reliable transceivers with solid APD receiver levels over 20km SMF, though shipping clearance took two days longer than estimated. Core optics performance is definitely five stars, just order with extra shipping buffer. =)
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496268
495920
D***n
Brazil
Verified
Purchase
5 .0
2026-02-09
Using these for high-speed SAN replication between two suburban sites 22km apart. Low latency, constant throughput, and optical power margins are right within spec. :-D
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496268
495913
S***y
Ukraine
Verified
Purchase
5 .0
2025-12-03
Excellent build quality. The pull-tab mechanism feels rugged enough for frequent field maintenance, and the optical dust caps kept the LC ferrule spotless upon arrival.
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496268
495914
L***s
Israel
Verified
Purchase
5 .0
2025-11-26
Plugged into our aggregation switches for metro backhaul. The 8x53G electrical lanes synced straight away. DOM readings show spot-on optical power across all four wavelengths, very happy with these.
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496268
495908
J***n
France
Verified
Purchase
5 .0
2025-10-31
Deployed in our enterprise storage replication backbone spanning 26km. The transceivers auto-negotiated at line rate, thermal dissipation is remarkably balanced within 0°C to 70°C limits, and sustained multi-terabit traffic runs without packet drops or frame jitter.
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496268
495905
K***d
Iran, Islamic Republic of
Verified
Purchase
5 .0
2025-09-22
Solid transceivers for data center DCI transport. CMIS Rev 4.0 handshake was recognized instantly by our network OS without throwing third-party optic warnings.
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496268
495912
S***s
Mexico
Verified
Purchase
5 .0
2025-08-19
Evaluated LINK-PP for our regional ISP backbone upgrade. Linking over 27km dark fiber with several patch interfaces, the high-sensitivity APD receiver prevented bit errors even through aging fiber splice points. DDM real-time diagnostic reporting integrates seamlessly into our NOC dashboard with zero anomalies over two weeks of soak testing.
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496268
495907
S***r
Norway
Verified
Purchase
5 .0
2025-06-05
Swapped out costly OEM 400GBASE-ER4 modules with LINK-PP for our carrier interconnect. They play nice with our existing duplex LC patch panels and sync cleanly at 425Gbps max rate.
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496268
495911
R***r
Turkey
Verified
Purchase
5 .0
2025-03-03
Smooth deployment on our leaf-spine interconnects. The QSFP-DD MSA mechanical latch fits tightly into high-density cages, and DDM polling via SNMP is fully accurate.
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496268
495909
D***h
Taiwan, Province of China
Verified
Purchase
5 .0
2025-02-08
Rolled out six pairs of these LQD-LW400-ER4L QSFP-DD 400G optical modules for 5G base station backhaul aggregation. The EML transmitters deliver exceptionally stable output across all four LAN-WDM channels (1295nm to 1309nm). Thermal management inside dense outdoor cabinets is stable at a 54°C ambient-controlled rack temperature. Very impressed with the signal integrity under full-duplex throughput. ;)
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