The LINK-PP LQ-CW40-ER4I is an industrial-grade 40G QSFP+ optical transceiver delivering aggregate 40Gbps data transmission over single-mode fiber (SMF). Featuring high-power DFB lasers and high-sensitivity APD receivers across 4 CWDM channels, it operates across a wide industrial temperature range (-40°C to +85°C), ensuring seamless IEEE 802.3ba 40GBASE-ER4 and SFF-8436 protocol compatibility.
LINK-PP Part Number
LQ-CW40-ER4I
Vendor Name
LINK-PP
Form Factor
QSFP+
Max Data Rate
40Gbps
Wavelength
1271nm, 1291nm, 1311nm, 1331nm
Max Cable Distance
40km
Connector
Duplex LC
Media
SMF
Transmitter Type
DFB
Receiver Type
APD
TX Power
-2.7~4.5dBm
Receiver Sensitivity
<-21.2dBm
Powerbudget
18.5dB
Receiver Overload
-4.5dBm
Power Consumption
≤3.3W
Operating Temperature Range
-40°C to +85°C
Host FEC
Supported
Protocols
OTN OTU3, 40G Ethernet, SATA/SAS3, MSA Compliant
Key Features of LINK-PP LQ-CW40-ER4I 40G CWDM4 QSFP+
The LINK-PP LQ-CW40-ER4I transceiver delivers robust 40G Ethernet performance, extended 40km link reach, and low power consumption. Engineered with industrial-grade DFB+APD optoelectronics and Digital Diagnostic Monitoring (DOM), it ensures reliable, high-speed data transmission across harsh enterprise and telecommunication network infrastructures.
LINK-PP LQ-CW40-ER4I 40G QSFP+ Optical Module
The LINK-PP LQ-CW40-ER4I 40G QSFP+ module integrates hot-pluggable architecture with 4x10G channels, enabling high-density data switching and ultra-reliable connectivity for high-bandwidth industrial Ethernet and telecommunication backhaul networks.
LQ-CW40-ER4I: 40G Connectivity for Campus Core Switches
Engineered for campus core switches and routers, the LQ-CW40-ER4I provides seamless 40G link aggregation, low latency, and high-throughput data distribution across enterprise backbone architectures and distributed cloud networking environments.
LQ-CW40-ER4I Module with CWDM4 Technology for Fiber Efficiency
Leveraging 4-lane CWDM optical multiplexing, the LQ-CW40-ER4I combines four distinct 10Gbps optical channels onto a single fiber pair, significantly maximizing bandwidth capacity and minimizing fiber cabling deployment expenses.
LQ-CW40-ER4I Module with 1271nm, 1291nm, 1311nm, 1331nm Wavelength
The LQ-CW40-ER4I utilizes four standard CWDM center wavelengths—1271nm, 1291nm, 1311nm, and 1331nm—driven by cooled DFB transmitters to guarantee precise spectral transmission, low chromatic dispersion, and high signal integrity.
LQ-CW40-ER4I Module Supporting 40km Transmission
Equipped with high-sensitivity APD photodetectors and premium DFB lasers, the LQ-CW40-ER4I supports up to 40km long-reach transmission over single-mode fiber without external amplification, ideal for metro-edge and DCI links.
LQ-CW40-ER4I Module with Duplex LC Interface
Featuring an industry-standard duplex LC optical interface, the LQ-CW40-ER4I provides effortless plug-and-play optical patching, exceptional mechanical stability, and low insertion loss across complex structured fiber distributions.
LQ-CW40-ER4I Module with DOM for Real-Time Monitoring
With integrated Digital Optical Monitoring (DOM), the LQ-CW40-ER4I allows real-time diagnostics via 2-wire I2C interface, actively tracking transceiver temperature, voltage, laser bias currents, and TX/RX optical power levels.
LINK-PP LQ-CW40-ER4I 40G QSFP+ Certification
The LINK-PP LQ-CW40-ER4I adheres to world-class regulatory standards. Certified by CE, FCC, UKCA, UL, and REACH directives, it meets strict international laser safety and environmental requirements.
Every LQ-CW40-ER4I unit undergoes stringent end-to-end quality assurance, incorporating automated optoelectronic parameter validation, switch interoperability testing, and continuous signal integrity evaluations before final shipment.
LQ-CW40-ER4I Quality Certifications
LINK-PP manufactures the LQ-CW40-ER4I under strict ISO9001 quality systems, fully satisfying global standards including CE, FCC, UL, UKCA, RoHS, and REACH international environmental safety compliances.
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.
LQ-CW40-ER4I Certified for Reliable Host-Device Compatibility
The LQ-CW40-ER4I is fully verified and encoded to ensure seamless hardware compatibility and native plug-and-play stability across major networking switches, routers, and enterprise servers.
LINK-PP implements multi-stage reliability screening to guarantee every industrial-grade LQ-CW40-ER4I QSFP+ transceiver delivers superior signal performance, long-term stability, and zero packet loss.
Optical Spectrum Test
Evaluates CWDM channel center wavelengths, side-mode suppression ratio, and spectral width for peak optical precision.
Eye Pattern Test
Validates transmitter signal rise-and-fall transitions, extinction ratios, and clean optical eye diagrams without distortion.
Bit Error Rate Test
Verifies receiver sensitivity and APD performance to maintain error-free transmission under long-distance 40G line rates.
Temperature Test
Conducts thermal chamber cycling to guarantee flawless electrical and optical operation from -40°C to +85°C.
Product Shipping for LINK-PP LQ-CW40-ER4I 40G QSFP+
LINK-PP delivers secure shipping for each LQ-CW40-ER4I transceiver using customized packaging and dependable international logistics to ensure fast, damage-free transit.
Deploying the LINK-PP LQ-CW40-ER4I is straightforward: insert the hot-pluggable module firmly into the switch QSFP+ port, connect standard duplex LC single-mode fiber cables, and verify link activity via switch CLI and DOM diagnostics.
LQ-CW40-ER4I 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 LQ-CW40-ER4I 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.
A:
100%. This 40G QSFP+ CWDM4 optic uses premium DFB lasers and APD receivers to deliver the exact same 40km SMF reach and 18.5dB power budget as the original modules, but at a fraction of the cost. By
admin on
2026-05-07
A:
Absolutely. It's MSA compliant and fully OEM compatible, ensuring seamless interoperability across major brands like Cisco, Juniper, and Arista without throwing unsupported transceiver errors. By
admin on
2026-03-23
A:
You will need standard Single-Mode Fiber (SMF) patch cables with Duplex LC connectors. Because it uses CWDM4 technology to multiplex 4 wavelengths (1271nm-1331nm) over a single fiber pair, you do not need MPO/MTP cables. By
admin on
2026-03-15
A:
Definitely. The module is fully CE, FCC, UKCA, UL, and RoHS compliant. It’s manufactured under ISO9001 and ISO14001 systems, meeting all strict global regulatory requirements for telecom infrastructure. By
admin on
2026-02-03
Please write comments with more than three
character.
495093
459590
K***n
Sweden
Verified
Purchase
5 .0
2026-04-30
Deployed these 40km industrial SMF transceivers in our outdoor cell tower backhaul. The -40°C to 85°C temp range is legit. DOM monitoring shows stable DFB transmission across all multi-vendor switches!
Please write comments with more than three
character.
495093
459595
K***n
Germany
Verified
Purchase
5 .0
2025-10-07
Needed a robust DCI solution for our enterprise backbone. These LQ-CW40-ER4I modules push a solid 40Gbps over single-mode fiber. OTN OTU3 protocol support is a huge plus for our routing.
Please write comments with more than three
character.
495093
459586
N***z
Panama
Verified
Purchase
5 .0
2025-09-12
Migrating our harsh-environment outdoor cabinets to 40G. The 1271-1331nm wavelengths are spot on. DOM reads perfectly in our NMS, and the 18.5dB power budget handles our legacy fiber splices easily.
Please write comments with more than three
character.
495093
459584
M***r
Russian Federation
Verified
Purchase
5 .0
2025-06-04
Tested the 40G QSFP+ CWDM4 in our campus core network. Flawless interoperability with Cisco and Juniper gear. The duplex LC interface and APD receiver handled the 35km fiber run beautifully.
Canada · English · CAD
