Hey, we're running a mix of Cisco Nexus and Arista switches in our core network. Will this 400G FR4 transceiver work seamlessly across both brands without raising third-party optic alarms?

Absolutely! The LQD-CW400-FR4C is fully OEM-compatible and coded to support Cisco, Arista, and other major networking brands like Juniper and Mellanox. You can deploy it confidently in mixed-switch environments without triggering compatibility errors.

Just to confirm before purchasing for our campus fiber ring—does this transceiver use a standard duplex LC connector, and is it compatible with our existing OS2 single-mode fiber (SMF)?

Yes! This 400G QSFP-DD optical module features an industry-standard Duplex LC interface. It is fully compatible with standard OS2 single-mode fiber (SMF) and supports transmission distances up to 2km utilizing 1310nm CWDM4 wavelengths.

I'm an IT procurement manager looking to order 200 units for a new datacenter build in Frankfurt. Do you offer B2B bulk discounts for large volume purchases?

Yes, we provide competitive tiered pricing for enterprise B2B customers. For an order of 200 pieces of our 400G QSFP-DD modules, you'll receive a significant bulk discount over the standard unit price. Please contact our live sales team for a custom quote!

Breadcrumb: Home; Products; Optic Transceivers | SFP Modules; 200/400/800G Transceiver Modules; 400G QSFP-DD/OSFP/QSFP112; 219437

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FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module

Name: FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 219437
Price: 543.840 USD
Availability: InStock
Rating: 4.9 (26 reviews)

Product: FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module
SKU: 219437
P/N: LQD-CW400-FR4C
Price: $ 618
Stock: 205 in Stock
Sold: 1.2K
Product URL: https://www.l-p.com/products/495462.htm

For Order Over $1000 Get $15.00 Off , Code: Linkpp15

For Order Over $3000 Get $50.00 Off , Code: Linkpp50

For Order Over $5000 Get $100.00 Off , Code: Linkpp100

New Users: $10 Coupon for Orders , Code: linkpp2610

26 Reviews

3 Questions

1.2K Sold

$ 618

Free shipping. For wholesale pricing, please contact us directly.

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$ 580.92

1000

$ 562.38

3000

$ 543.84

Manufacture: LINK-PP P/N: LQD-CW400-FR4C SKU: 219437

Compatible:: Cisco; LINK-PP; Arista; Broadcom; Ciena; Dell; EdgeCore; Extreme; FS; Generic; H3C; HPE Aruba; HW; Intel; Juniper; NVIDIA/Mellanox

Compatible P/N:: OSFP-400G-FR4 | 2km; QDD-FR4-400G | 2km; QSFP112-FR4-400G | 2km; OSFP-LR4-400G | 10km; QDD-LR4-400G | 10km; QSFP112-LR4-400G | 10km

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Estimated delivery time : 3 - 10 days.

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FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Specifications

The FS QDD-FR4-400G Compatible LINK-PP module is a commercial-grade 400G QSFP-DD optical transceiver engineered for high-density networking. Compliant with 400GBASE-FR4 standards, it utilizes 8x53.125Gb/s PAM4 electrical lanes and 4x106.25Gb/s optical channels. It features an integrated EML laser, a PIN receiver, and a duplex LC connector, delivering stable 400Gbps aggregation over single-mode fiber with a maximum power consumption under 10W.

FS Part Number	QDD-FR4-400G	Vendor Name	LINK-PP
Form Factor	QSFP-DD	Max Data Rate	400Gbps
Connector	Duplex LC	Media	SMF
Wavelength	1271nm, 1291nm, 1311nm, 1331nm	Max Cable Distance	2km
Transmitter Type	CWDM EML	Receiver Type	PIN
Max Power Consumption	9.5W	Protocols	IEEE 802.3bs, QSFP-DD MSA
DDM/DOM	Supported	Operating Temperature range	0°C to +70°C

Key Features of FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD

This hot-pluggable QSFP-DD transceiver offers high port density and low power consumption for modern networks. Leveraging advanced 4-level pulse amplitude modulation, it integrates digital optical monitoring for comprehensive performance tracking. It provides cost-effective, high-bandwidth interconnectivity with broad third-party host compatibility.

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Optical Module

The FS QDD-FR4-400G Compatible LINK-PP optical module offers a reliable, plug-and-play solution for upgrading hardware to 400G. Designed for robust data aggregation, it minimizes footprint while maintaining superior thermal dissipation in high-density switch environments.

QDD-FR4-400G: 400G Connectivity for Cloud Data Centers

Tailored for next-generation cloud infrastructure, the QDD-FR4-400G delivers hyperscale bandwidth to handle massive traffic demands. It bridges spine-and-leaf switches efficiently, ensuring ultra-low latency and consistent throughput required for modern AI and enterprise cloud environments.

QDD-FR4-400G Module with CWDM Technology for Fiber Efficiency

By incorporating integrated Coarse Wavelength Division Multiplexing technology, this module multiplexes four distinct channels onto a single fiber pair. This architecture dramatically reduces cabling complexity and optimizes existing fiber infrastructure capital expenditures.

QDD-FR4-400G Module with 1271nm, 1291nm, 1311nm, 1331nm Wavelength

Operating on four precise CWDM grid wavelengths of 1271nm, 1291nm, 1311nm, and 1331nm, the module minimizes optical crosstalk. This specific wavelength configuration guarantees clean grid spacing and optimized signal integrity over single-mode links.

QDD-FR4-400G Module Supporting 2km Transmission

Engineered for localized reach, this transceiver supports error-free link distances up to 2km using standard G.652 single-mode fiber. It serves as the ideal reach-optimized solution for intra-datacenter interconnects and campus backbone wiring.

QDD-FR4-400G Module with Duplex LC Interface

Featuring an industry-standard duplex LC optical interface, this module enables secure, tactile fiber patching. The standard LC connector format ensures seamless integration with legacy patch panels, clean mating interfaces, and low insertion loss.

QDD-FR4-400G Module with DOM for Real-Time Monitoring

Equipped with built-in Digital Optical Monitoring via the CMIS interface, network administrators can track diagnostics in real time. The module continuously reports internal temperature, supply voltage, laser bias current, and received optical power levels.

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Certification

This transceiver holds complete international regulatory approvals, satisfying rigorous global standards for electronic products. It complies fully with standard multi-source agreements, ensuring safe, law-compliant deployment across global network infrastructures.

QDD-FR4-400G Quality Testing Program

LINK-PP subjects every single transceiver to a comprehensive multi-stage validation pipeline. Technicians rigorously verify every parameter, ensuring that each module leaves the factory performing at peak physical and optical excellence.

QDD-FR4-400G Quality Certifications

Manufactured under strict ISO9001 quality management guidelines, this module holds CE, FCC, and RoHS environmental certifications. These credentials guarantee toxic-free materials, electromagnetic safety compliance, and long-term operating reliability.

QDD-FR4-400G Certified for Reliable Host-Device Compatibility

Extensive hardware interoperability matrices certify this transceiver for seamless use with major switch and router vendors. It guarantees immediate host recognition, eliminating system faults or communication lockouts upon installation.

Rigorous Testing Ensures Reliable QSFP-DD Performance

Every QDD-FR4-400G module undergoes strict parametric validation. Our comprehensive testing protocol ensures optimal data transmission, mechanical integrity, and absolute reliability under maximum network workloads.

Rigorous Testing Ensures Reliable Transceiver Performance

Optical Spectrum Test

Precision spectrum analysis verifies correct CWDM central wavelengths and side-mode suppression ratios.

Eye Pattern Test

PAM4 eye diagram testing ensures clean optical signals, low jitter, and excellent signal-to-noise ratios.

Bit Error Rate Test

Strict PRBS testing guarantees error-free data throughput, fully satisfying mandatory host KP4 FEC benchmarks.

Temperature Test

Thermal chamber cycling validates commercial-grade stability across variable operating environments from 0°C to 70°C.

Product Shipping for FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD

We implement specialized logistic workflows and standardized defensive packaging for all transit. Your modules arrive safely, secured against environmental hazards and transportation stresses, ready for deployment.

Anti-Static Protective Packaging

Each module is sealed inside a premium ESD-safe anti-static blister package.

Shock-Resistant Transport Protection

Heavy-duty cushioned outer boxes shield the optics from accidental drops and vibrations.

Fast Order Processing and Dispatch

Streamlined warehousing ensures swift verification, rapid packaging, and prompt courier handover.

Global Logistics and International Delivery

Partnering with leading express carriers guarantees rapid, tracked delivery to any worldwide destination.

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Usage Demonstration

This application showcase demonstrates the simple hot-swapping installation of the transceiver into standard high-density 400G enterprise switches. Watch how the host system instantly discovers the module, initiates the DOM link diagnostics, and establishes a stable 2km fiber link.

QDD-FR4-400G Technical Support

LINK-PP provides professional technical support, including pre-sales consultation, compatibility verification, and post-deployment troubleshooting to ensure smooth network operation.

Pre-Sales Technical Consultation

Professional technical guidance to help customers select the most suitable QDD-FR4-400G modules based on network architecture and application requirements.

Compatibility Verification Support

Compatibility checks and validation to ensure seamless operation with Cisco switches and other supported networking platforms.

Deployment & Installation Assistance

Step-by-step support for installation, configuration, and initial deployment to ensure stable and correct operation.

Long-Term Technical Assurance

Ongoing technical support throughout the product lifecycle to ensure reliable performance in enterprise and carrier-grade networks.

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD After-Sales Assurance

LINK-PP provides after-sales support for the smooth deployment and reliable operation of the optical modules.

15-day no-reason return and refund

Free replacement for dead-on-arrival (DOA) or defective items within the initial period

Free repair services for manufacturing defects throughout the warranty period

Warranty exclusions and conditions apply

Model Comparison Table

	Current Model QDD-FR4-400G	QDD-ZR-400G	QDD-ER4L-400G

Compatible	FS	FS	FS
Data Rate (Max)	400Gbps	400Gbps	400Gbps
Wavelength	1271nm, 1291nm, 1311nm, 1331nm	1528.77~1566.52nm	1310nm
Connector	Duplex LC	Duplex LC	Duplex LC
Cable Distance (Max)	2km	120km	30km
Cable Type	SMF	SMF	SMF
Power Consumption	9.5W
Operating Temperature	0°C to +70°C	0°C to +70°C	0°C to +70°C
Vendor Name	LINK-PP	LINK-PP	LINK-PP
Form Factor	QSFP-DD	QSFP-DD	QSFP-DD
Transmitter Type	CWDM EML	-	EML
Receiver Type	PIN	-	APD
Protocols	IEEE 802.3bs, QSFP-DD MSA	OIF 400ZR, OIF-CMIS-05.2, OIF-C-CMIS-01.2, QSFP-DD-Hardware-Rev6.3, IEEE Std 802.3-2018	QSFP-DD MSA, CMIS Rev4.0, IEEE 802.3, IEEE 802.3bs, OIF 56G PAM4
DDM/DOM	Supported	Supported	Supported

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Q: Hey, we're running a mix of Cisco Nexus and Arista switches in our core network. Will this 400G FR4 transceiver work seamlessly across both brands without raising third-party optic alarms? By S***e on 2026-02-17

A: Absolutely! The LQD-CW400-FR4C is fully OEM-compatible and coded to support Cisco, Arista, and other major networking brands like Juniper and Mellanox. You can deploy it confidently in mixed-switch environments without triggering compatibility errors. By admin on 2026-02-17
Q: Just to confirm before purchasing for our campus fiber ring—does this transceiver use a standard duplex LC connector, and is it compatible with our existing OS2 single-mode fiber (SMF)? By R***r on 2025-08-27

A: Yes! This 400G QSFP-DD optical module features an industry-standard Duplex LC interface. It is fully compatible with standard OS2 single-mode fiber (SMF) and supports transmission distances up to 2km utilizing 1310nm CWDM4 wavelengths. By admin on 2025-08-27
Q: I'm an IT procurement manager looking to order 200 units for a new datacenter build in Frankfurt. Do you offer B2B bulk discounts for large volume purchases? By D***t on 2025-06-21

A: Yes, we provide competitive tiered pricing for enterprise B2B customers. For an order of 200 pieces of our 400G QSFP-DD modules, you'll receive a significant bulk discount over the standard unit price. Please contact our live sales team for a custom quote! By admin on 2025-06-21

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L***s

Russian Federation

Verified Purchase

5 .0

2026-04-18

Excellent price for 400GBASE-FR4 transceiver modules.

51 Helpful vote Comments

E***n

Germany

Verified Purchase

5 .0

2026-04-10

Reliable 400G connectivity for indoor rack patching.

72 Helpful vote Comments

D***l

Ireland

Verified Purchase

5 .0

2026-04-01

Used in our Munich server room. 400G QSFP-DD form factor fit snugly without any issues.

239 Helpful vote Comments

R***t

Ukraine

Verified Purchase

5 .0

2026-02-14

Seamless integration with our Juniper gear. Duplex LC interface makes patching SMF super easy.

189 Helpful vote Comments

M***s

Indonesia

Verified Purchase

5 .0

2026-01-23

Plug and play on Dell 400G switches!

113 Helpful vote Comments

D***z

Finland

Verified Purchase

5 .0

2026-01-03

Perfect for enterprise cloud 400G interconnects. ☁️

61 Helpful vote Comments

K***l

Colombia

Verified Purchase

4 .0

2025-11-06

Delivery took an extra day to our London hub, but the 400G QSFP-DD works flawlessly.

76 Helpful vote Comments

S***n

Canada

Verified Purchase

5 .0

2025-09-13

Reliable DOM tracking on these 400G SMF optics.

171 Helpful vote Comments

M***r

Republic of Korea

Verified Purchase

5 .0

2025-08-15

Exact QSFP-DD MSA specs, zero compatibility issues.

138 Helpful vote Comments

C***n

Thailand

Verified Purchase

5 .0

2025-05-08

We procured a batch for our European campus fiber network upgrade. The IEEE 802.3bs compliance ensures smooth interoperability with Mellanox adapters. LC connectors feel premium, and 2km reach covers our inter-building links perfectly.

208 Helpful vote Comments

N***z

Ukraine

Verified Purchase

5 .0

2025-02-21

Highly recommend this CWDM4 QSFP-DD for base station backhaul. 1310nm wavelength is rock solid.

46 Helpful vote Comments

J***e

United States

Verified Purchase

5 .0

2023-10-13

Goods as advertised. Shipping great. Recommended!

88 Helpful vote Comments

T***t

Spain

Verified Purchase

5 .0

2023-10-01

Always professional service and great pricing. packages often received earlier than promised.

46 Helpful vote Comments

J***d

United States

Verified Purchase

5 .0

2023-07-31

Item came on time, as described. No issues with the seller.

98 Helpful vote Comments

T***g

Israel

Verified Purchase

5 .0

2023-04-13

it’s always a pleasure to do business with LINK-PP.

45 Helpful vote Comments

A***k

Finland

Verified Purchase

4 .0

2022-12-16

Easy website, Fast service!

94 Helpful vote Comments

A***l

Macao

Verified Purchase

5 .0

2022-11-05

Fast shipping, good service, high quality.

65 Helpful vote Comments

T***g

Romania

Verified Purchase

5 .0

2022-07-16

always happy with quality of merchandise, as well as Fast delivery. wide selection of goods

12 Helpful vote Comments

J***n

Hong Kong

Verified Purchase

5 .0

2022-06-19

Price is very affordable.

47 Helpful vote Comments

R***t

Bulgaria

Verified Purchase

5 .0

2022-05-27

Cheap prices, Fast shipping and good products.

53 Helpful vote Comments

R***e

Mexico

Verified Purchase

5 .0

2022-05-23

Great performance and compatibility for the money. Easy to use.

48 Helpful vote Comments

A***h

Turkey

Verified Purchase

5 .0

2022-04-24

Best services qith good product and low prices

66 Helpful vote Comments

D***g

Republic of Korea

Verified Purchase

4 .0

2022-04-13

Came on time, great customer service with attention to communication. Great supplier!

87 Helpful vote Comments

I***f

Belgium

Verified Purchase

5 .0

2022-02-23

very pleased w/ all orders to date.

91 Helpful vote Comments

M***e

Spain

Verified Purchase

5 .0

2022-02-13

I was impressed by how easy it was to order and helpfulness of frontline staff, when I needed to change the delivery address to arrive upstate at a business function.

48 Helpful vote Comments

T***d

Hungary

Verified Purchase

5 .0

2022-01-13

I received my order quickly. They were exactly what I ordered and worked properly. I plan on ordering all my future transceiver supplies from l-p.com.

19 Helpful vote Comments

Verified Purchase

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Arista

QDD-ER4L-400G | 30km

Arista QDD-ER4L-400G Compatible LINK-PP 400G ER4 QSFP-DD 8 x 50G PAM4 1310nm 30km Duplex LC SMF Transceiver Module

198 Sold

$ 4,399 ~~$ 0.00~~

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Juniper

QDD-ER4L-400G | 30km

Juniper QDD-ER4L-400G Compatible LINK-PP 400G ER4 QSFP-DD 8 x 50G PAM4 1310nm 30km Duplex LC SMF Transceiver Module

206 Sold

$ 4,399 ~~$ 0.00~~

{"pid":496267,"minimum_ordered_quantity":1,"skulist":[{"pskuid":219455,"cid":752,"pid":496267,"sku":"219455","psvid1":318548,"psvid2":318549,"psvid3":0,"psvid4":0,"left_num":102,"price":"4399.000","strike_price":"0.000","innercode":"","addtime":"2026-07-28 23:44:54","uptime":"2026-07-28 23:44:54","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"4,399","subtotal":4399}]}
Dell

QDD-ER4L-400G | 30km

Dell QDD-ER4L-400G Compatible LINK-PP 400G ER4 QSFP-DD 8 x 50G PAM4 1310nm 30km Duplex LC SMF Transceiver Module

233 Sold

$ 4,399 ~~$ 0.00~~

{"pid":496266,"minimum_ordered_quantity":1,"skulist":[{"pskuid":219451,"cid":752,"pid":496266,"sku":"219451","psvid1":318540,"psvid2":318541,"psvid3":0,"psvid4":0,"left_num":119,"price":"4399.000","strike_price":"0.000","innercode":"","addtime":"2026-07-28 23:44:49","uptime":"2026-07-28 23:44:49","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"4,399","subtotal":4399}]}
Cisco

QDD-ER4L-400G | 30km

Cisco QDD-ER4L-400G Compatible LINK-PP 400G ER4 QSFP-DD 8 x 50G PAM4 1310nm 30km Duplex LC SMF Transceiver Module

219 Sold

$ 4,399 ~~$ 0.00~~

{"pid":496265,"minimum_ordered_quantity":1,"skulist":[{"pskuid":219453,"cid":752,"pid":496265,"sku":"219453","psvid1":318544,"psvid2":318545,"psvid3":0,"psvid4":0,"left_num":138,"price":"4399.000","strike_price":"0.000","innercode":"","addtime":"2026-07-28 23:44:52","uptime":"2026-07-28 23:44:52","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"4,399","subtotal":4399}]}
LINK-PP

LQD-LW400-ER4LC | 30km

LINK-PP LQD-LW400-ER4LC 400G QSFP-DD 1310nm 30km Duplex LC DOM SMF Optical Transceiver Module

23 Reviews
|
210 Sold

$ 4,399 ~~$ 0.00~~

{"pid":496264,"minimum_ordered_quantity":1,"skulist":[{"pskuid":219445,"cid":752,"pid":496264,"sku":"219445","psvid1":318528,"psvid2":318529,"psvid3":0,"psvid4":0,"left_num":90,"price":"4399.000","strike_price":"0.000","innercode":"","addtime":"2026-07-28 23:39:33","uptime":"2026-07-28 23:39:33","status":0}],"shippingLists":[{"id":"FedEx","name":"FedEx","logo":"res\/shipping\/FEDEX.jpg","price":"0","isfree":0,"total":"0","tax":"","datemin":"3","datemax":"10","unit_price":"4,399","subtotal":4399}]}

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FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module

Product summary

Product Details

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Specifications

Key Features of FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Optical Module

QDD-FR4-400G: 400G Connectivity for Cloud Data Centers

QDD-FR4-400G Module with CWDM Technology for Fiber Efficiency

QDD-FR4-400G Module with 1271nm, 1291nm, 1311nm, 1331nm Wavelength

QDD-FR4-400G Module Supporting 2km Transmission

QDD-FR4-400G Module with Duplex LC Interface

QDD-FR4-400G Module with DOM for Real-Time Monitoring

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Certification

QDD-FR4-400G Quality Testing Program

QDD-FR4-400G Quality Certifications

QDD-FR4-400G Certified for Reliable Host-Device Compatibility

Rigorous Testing Ensures Reliable QSFP-DD Performance

Optical Spectrum Test

Eye Pattern Test

Bit Error Rate Test

Temperature Test

Product Shipping for FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD

Anti-Static Protective Packaging

Shock-Resistant Transport Protection

Fast Order Processing and Dispatch

Global Logistics and International Delivery

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD Usage Demonstration

QDD-FR4-400G Technical Support

Pre-Sales Technical Consultation

Compatibility Verification Support

Deployment & Installation Assistance

Long-Term Technical Assurance

FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD After-Sales Assurance

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FS QDD-FR4-400G Compatible LINK-PP 400G QSFP-DD 1310nm 2km Duplex LC DOM SMF Optical Transceiver Module

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