LS-CW391G-40C SFP module is specified for 1.25Gbps optical links at 1390nm on the CWDM grid, and it uses a DFB laser and a PIN photodiode to achieve transmission distances up to 40km over single-mode fiber. Real-time digital optical monitoring provides instantaneous readouts of key operating parameters, including Rx/Tx optical power, laser bias current, operating temperature, and supply voltage. The module is qualified for commercial temperature applications from 0 to +70°C.
LINK-PP Part Number
LS-CW391G-40C
Vendor Name
LINK-PP
Form Factor
SFP
Max Data Rate
1.25Gbps
Wavelength
1390nm
Max Cable Distance
40km
Connector
Duplex LC
Media
SMF
Transmitter Type
DFB
Receiver Type
PIN
TX Power
-5 to 0dBm
RX Power
-26 to -1dBm
Receiver Sensitivity
-24dBm
Receiver Overload
-1dBm
EMC (Electromagnetic Compatibility)
Supported
DOM Support
Yes
Operating Temperature Range
0 to 70°C
Protocols
SFP MSA、SFF-8472
Key Features of LINK-PP LS-CW391G-40C 1G SFP
LINK-PP LS-CW391G-40C is a 1G SFP optical transceiver built for remote node aggregation over single-mode fiber. It combines CWDM 1390nm wavelength, 40km reach, and duplex LC interface in a hot-pluggable SFP form factor. Real-time DOM enables link supervision, and the module fully complies with SFP MSA for broad interoperability.
LINK-PP LS-CW391G-40C 1G SFP Optical Module
This CWDM SFP module features a hot-pluggable footprint that enables replacement without system shutdown. It is built to the SFP MSA, ensuring mechanical fit and electrical compatibility with a wide range of host equipment.
LS-CW391G-40C: 1 Gbps Connectivity for Remote Node Aggregation
With a 1Gbps line rate, this module handles aggregated traffic from dispersed business locations such as campus buildings or co-location facilities. It provides a reliable way to backhaul collected data to a main aggregation point within enterprise networks.
LS-CW391G-40C Module with CWDM Technology for Fiber Efficiency
CWDM technology enables multiple wavelengths to share one fiber, significantly reducing the need for additional fiber strands. This module uses the 1390nm channel, which helps operators optimize existing fiber infrastructure and lower deployment costs.
LS-CW391G-40C Module with 1390nm Wavelength
The 1390nm operating wavelength falls within the CWDM grid, providing a stable and low-loss transmission window. It is specifically chosen to support long-reach links while avoiding interference with adjacent channels in a CWDM system.
LS-CW391G-40C Module Supporting 40km Transmission
Forty kilometers of reach is achievable over standard single-mode fiber without requiring optical amplification. This distance covers most metro-access and campus interconnection needs, making the module reliable for extended links.
LS-CW391G-40C Module with Duplex LC Interface
The duplex LC connector offers a compact and industry-standard interface for easy fiber patching. It supports both transmit and receive paths over two separate fibers, ensuring simple and secure physical connections.
LS-CW391G-40C Module with DOM for Real-Time Monitoring
Digital optical monitoring provides real-time readouts of optical power, temperature, voltage, and bias current. This function is compatible with SFF-8472, enabling network management systems to track link health and diagnose faults promptly.
LINK-PP LS-CW391G-40C 1G SFP Certification
The LINK-PP LS-CW391G-40C 1G SFP transceiver fully complies with international quality standards, including ISO 9001 certification. It also meets strict safety and environmental requirements such as CE, RoHS, and FCC.
Each transceiver undergoes rigorous optical and electrical testing to ensure stable data transmission. These comprehensive tests guarantee high performance and low failure rates before shipment.
LS-CW391G-40C Quality Certifications
This module is manufactured under strict quality management systems to maintain consistent production standards. Official compliance certificates ensure it meets global requirements for safety and environmental protection.
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.
LS-CW391G-40C Certified for Reliable Host-Device Compatibility
The LS-CW391G-40C CWDM module is thoroughly tested across a wide range of switches and routers for seamless integration. It offers plug-and-play convenience without triggering system compatibility warnings.
Rigorous Testing Ensures Reliable SFP Performance
Every LS-CW391G-40C SFP transceiver undergoes comprehensive validation testing to maintain consistent signal integrity across demanding network environments. Discover our full validation methodology at the LINK-PP Test Support Center.
Optical Spectrum Test
Measure laser output wavelengths to prevent channel signal interference.
Eye Pattern Test
Evaluate signal clear shapes to lower overall optical distortion.
Bit Error Rate Test
Confirm complete data integrity under full line-rate packet flow.
Temperature Test
Validate operational stability under extreme thermal conditions.
Product Shipping for LINK-PP LS-CW391G-40C 1G SFP
All LS-CW391G-40C SFP modules are carefully packed to prevent physical and electrostatic damage during transit. Reliable global carriers ensure prompt delivery directly to your facility.
Anti-Static Protective Packaging
Prevent electrostatic discharge from damaging sensitive module circuit components.
Shock-Resistant Transport Protection
Shield sensitive internal optics against impacts during active transit.
Fast Order Processing and Dispatch
Accelerate warehouse fulfillment to minimize customer project deployment delays.
Global Logistics and International Delivery
Reach destinations around the world using dependable freight partners.
LINK-PP LS-CW391G-40C 1G SFP Usage Demonstration
Deploying the LINK-PP LS-CW391G-40C CWDM SFP requires aligning the 1390nm wavelength channel with matching multiplexer ports. Simply hot-plug the transceiver into compatible switch interfaces to aggregate remote node traffic and streamline long-reach data distribution across enterprise and metro network backbones.
LS-CW391G-40C 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 LS-CW391G-40C 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:
For reaching the full 40km reach over CWDM multiplexers, standard low-water-peak single-mode fiber (ITU-T G.652.D) is recommended to prevent localized optical attenuation at the 1390nm grid. By
admin on
2026-04-09
A:
Yes, it is fully compliant with SFP MSA and SFF-8472 specifications, ensuring universal plug-and-play operation. We can also pre-program custom EEPROM coding before shipment to ensure seamless compatibility with your host hardware. By
admin on
2026-02-08
A:
The module incorporates a high-performance 1390nm CWDM DFB laser transmitter paired with a high-sensitivity PIN photodetector to ensure reliable 40km SMF links. By
admin on
2025-06-16
A:
Yes, we offer volume-based tier discounts. Please share your required quantity with our sales team for an immediate custom quote. By
admin on
2025-01-05
Please write comments with more than three
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492118
454265
A***s
Norway
Verified
Purchase
5 .0
2026-06-02
Our engineering team deployed these 1G CWDM 40km SFP modules across regional aggregation nodes to expand backhaul capacity without running additional optical cable pairs. The transceivers were recognized instantly by our core enterprise switches, and the digital diagnostic monitoring accurately tracked operating voltage and internal temperature within our data center racks. Even under peak hours with high data traffic across multiple VLANs, the link remained completely stable without interface resets or frame errors. The duplex LC optical interface latches firmly into place, making maintenance straightforward and hassle-free.
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character.
492118
454282
B***t
United States
Verified
Purchase
5 .0
2026-05-11
Real-time optical diagnostic monitoring is crucial for our core switching gear. These transceivers report accurate laser bias, internal temperature, and optical power directly to our SNMP monitor. Running at a steady 34°C inside a climate-controlled server room.
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character.
492118
454270
L***t
Ireland
Verified
Purchase
5 .0
2026-05-02
Deployed these 1390nm 1G CWDM SFP modules to connect field distribution cabinets across our automated logistics terminal via single-mode fiber runs. Despite operating within enclosed environmental cabinets subject to daily temperature fluctuations, the transceivers maintained exceptional signal integrity and stable laser transmission at all times. The metal housing provides effective electromagnetic shielding against interference from nearby industrial machinery and motor drives, ensuring clean telemetry transmission. These optics have proven thoroughly dependable for expanding network bandwidth across demanding campus topologies.
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character.
492118
454285
T***n
United Kingdom
Verified
Purchase
5 .0
2026-04-05
Bought a handful to test against my existing CWDM gear, and they negotiated without any vendor lock issues. DOM works, temps stable within the 0-70°C range.
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492118
454279
S***n
Canada
Verified
Purchase
5 .0
2026-03-21
Installed these CWDM optical modules to link remote SAN storage across offsite facilities over a 30km dedicated dark fiber pair. Steady 1.25G line rate throughput with negligible latency and zero frame drops during overnight rsync replication.
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492118
454273
L***e
Spain
Verified
Purchase
5 .0
2026-02-16
Hot-plugged directly into a live aggregation switch during maintenance hours without resetting the interface or dropping adjacent SFP ports. Instant handshake and link carrier detection.
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492118
454267
B***n
India
Verified
Purchase
5 .0
2025-12-18
Needed a 1390nm channel to fill out our CWDM Mux, and these were the cheapest option that actually worked. DOM readouts match my meter within a dB. Recommended for anyone expanding a CWDM ring.
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492118
454278
P***f
United Arab Emirates
Verified
Purchase
5 .0
2025-12-04
We were exhausting dark fiber pairs between two campus distribution hubs. Dropped a pair of these 1390nm 1G SFP modules into our CWDM passive Mux over a 34km OS2 single-mode span. The link came up instantly with -4dBm Tx and healthy Rx sensitivity. Saved us a fortune on new trenching!
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492118
454269
V***t
Belgium
Verified
Purchase
4 .0
2025-11-28
The module itself is great, does exactly what it should. Four stars because shipping took longer than expected and there was no tracking update for a while. Not the product's fault, but worth knowing for time-sensitive projects.
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492118
454262
D***x
Sweden
Verified
Purchase
5 .0
2025-10-23
We integrated a batch of these LS-CW391G-40C 1G CWDM transceivers into our enterprise multi-building campus network to multiplex extra Gigabit links over existing single-mode dark fiber. The 1390nm channel aligned perfectly with our passive multiplexer grid, establishing a crystal-clear carrier link without requiring any manual wavelength adjustments. Throughout our multi-day continuous stress testing under maximum line-rate traffic, the transceivers delivered zero packet loss, stable framing, and clean jitter performance. The built-in DOM telemetry interfaces smoothly with our network management platform, providing reliable diagnostic visibility across all remote distribution nodes.
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492118
454281
R***t
Italy
Verified
Purchase
5 .0
2025-10-08
Great value for multi-channel WDM upgrades! We paired these CWDM 1G SFP moduleas with existing 8-channel Mux/Demux filters, and adjacent channel isolation was clean with zero cross-talk on the 1390nm grid. Excellent cost-to-performance ratio for ISP backhaul.
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492118
454272
C***n
Malaysia
Verified
Purchase
5 .0
2025-09-02
Deployed for cellular tower baseband aggregation over a 32km single-mode run. The DFB laser output power remained completely stable on the 1390nm grid through continuous traffic load testing.
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492118
454275
C***g
Romania
Verified
Purchase
5 .0
2025-08-31
We installed these 1390nm CWDM single-mode optical transceivers along our municipal optical fiber backbone to interconnect administrative facilities across the district. The transceivers delivered flawless bit-error-free performance across our low-water-peak fiber paths, avoiding any dispersion penalties across the multiplexed channels. Jumbo frames and latency-sensitive voice traffic transit cleanly across the link without packet fragmentation or buffer drops. Standard compliance with Gigabit Ethernet specifications ensures effortless integration into our existing carrier-grade routing architecture, making this an ideal choice for scalable metro deployments.
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492118
454266
Y***g
Thailand
Verified
Purchase
5 .0
2025-07-25
Utilized on a municipal CCTV fiber ring connecting traffic monitoring nodes across town. Duplex LC interface connected seamlessly to 9/125um single-mode patch cords. Clear bit-error-free transmission day and night.
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492118
454277
X***n
Poland
Verified
Purchase
5 .0
2025-06-30
Bought a 10-pack of the LS-CW391G-40C CWDM SFP module for our metro ring aggregation. The duplex LC connectors seat firmly without excessive play. Optical budget on our 27km link is well within the 19dB margin. Solid performance for enterprise optical networking. (b ᵔ▽ᵔ)b
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492118
454271
F***n
Republic of Korea
Verified
Purchase
5 .0
2025-06-12
Procured these 40km CWDM SFP modules to establish a dedicated out-of-band management and replication channel between our primary data center and our secondary backup facility. The optical link established immediate synchronization across several patch panels and field splices, maintaining steady link continuity over weeks of continuous operation. We observed zero link flapping, consistent throughput during automated overnight storage replication tasks, and completely normal thermal behavior inside dense server racks. For any network operations center looking for dependable long-reach CWDM optics, these units deliver enterprise-grade peace of mind.
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492118
454284
E***m
Australia
Verified
Purchase
5 .0
2025-05-19
Operating within standard 0°C to 70°C commercial rating. Our enclosed comms room gets warm during peak hours, but these 1390nm CWDM modules stayed rock-solid without thermal throttling or degraded laser output. Highly dependable transceivers.
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492118
454264
O***n
Indonesia
Verified
Purchase
4 .0
2025-04-07
Product works perfectly — links up at 40km, DOM is accurate, no issues at all. Knocking a star only because the box arrived a little banged up from shipping. The module itself was fine. Would order again.
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492118
454286
W***r
Mexico
Verified
Purchase
5 .0
2025-02-28
Solid CWDM SFP for the price. 1390nm matched our Mux channel perfectly and the DOM data is accurate. Shipping took a bit, but the product itself is great.
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