For long-range fiber links, I would start with the Omada SM311LS if the network uses TP-Link gear and needs a straightforward 1.25Gbps connection up to 20 km. The 4-pack 10GBase-LR is the better fit when throughput matters more than keeping a gigabit port, while H!Fiber’s 1.25G two-pack gives buyers a pair of modules with DDM monitoring and a stated three-year warranty. Those picks illustrate the main choice: match the transceiver speed and reach to both ends of the link, then confirm device compatibility before buying.
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These products do not all solve the same problem. Three are gigabit SFP options rated for up to 20 km, while two are 10-gigabit SFP+ modules with different stated reaches: 20 km for the four-pack and 10 km for H!Fiber’s pair. I rank the options by how well their speed, stated reach, bundle size, and specific compatibility information serve a long-distance link—not by treating every “single-mode” module as interchangeable. A module cannot compensate for incompatible switches, the wrong fiber plant, or mismatched optics at the far end.
Key Takeaways
- For TP-Link networks that need gigabit service over a stated 20 km reach, the Omada SM311LS is the clearest brand-specific choice.
- The 4-pack 10GBase-LR is the only listed option combining 10Gbps-class speed with a stated 20 km reach; confirm port and vendor compatibility first.
- H!Fiber’s 1.25G two-pack suits paired gigabit links and adds DDM monitoring plus a stated three-year warranty.
- The 1.25G four-pack and H!Fiber 10G two-pack trade bundle size and speed differently: compare how many links you need with the reach you require.
- All five require matching single-mode fiber, connector type, port speed, and compatible transceivers at both ends; stated maximum reach is not a substitute for checking the link budget.
| single mode sfp modules for long range link | Maximum reach | Wavelength | Fiber type | Data rate |
|---|---|---|---|---|
| Omada 1.25GBase-LX SMF | Up to 20 km | 1310nm | Single-mode fiber | 1.25Gbps |
| 4-Pack 1.25G SFP LC Module 100 | Up to 20 km | 1310nm | Single-mode fiber | 1.25Gbps |
| 4-Pack SFP+ 10GBase-LR LC Modu | 20 km | 1310nm | Single-mode fiber, OS2/OS3 listed | 10Gbps or higher |
| H!Fiber 1.25G Single Mode SFP | Up to 20 km | 1310nm | Single-mode fiber | 1.25Gbps |
| H!Fiber 10G Single Mode SFP+ L | Up to 10 km | 1310nm | Single-mode fiber | — |
More Details on Our Top Picks
Omada 1.25GBase-LX SMF, Single-Mode LC, GBIC, SFP Module (SM311LS)
The Omada SM311LS is the most direct recommendation in this group for a TP-Link network that needs a gigabit single-mode link. It is specified for 1.25Gbps over as much as 20 km at 1310nm, with an LC/UPC port. That combination suits extending a LAN between buildings or network rooms when the existing switches have compatible SFP ports and the installed fiber supports the route.
Its advantage over the broad-compatibility four-pack is a clearer stated fit with TP-Link devices, not a higher speed or reach. Like the other 1.25G options, it is not the right answer for a 10Gbps port or a network that needs more than gigabit throughput. The single-module format also differs from the H!Fiber and multi-pack options: it makes sense for a targeted connection or replacement, but buyers building several links should compare bundle choices. I would skip it if the hardware is from another vendor and compatibility has not been confirmed.
Pros:- Stated reach of up to 20 km over single-mode fiber
- Clear compatibility positioning for TP-Link SFP ports
- Hot-pluggable design supports installation without treating the module as a permanent component
- 1310nm wavelength and LC/UPC connector are specified
Cons:- Limited to 1.25Gbps, so it does not serve 10Gbps links
- Requires compatible single-mode fiber and a matching optic at the far end
- The supplied information gives a one-year warranty
Best for: Buyers extending a TP-Link network over single-mode fiber who need one 1.25Gbps module and a stated reach up to 20 km.
Not ideal for: Anyone who needs 10Gbps, needs several modules in one purchase, or cannot confirm compatibility with the specific SFP port.
- Data rate:1.25Gbps
- Maximum reach:Up to 20 km
- Wavelength:1310nm
- Fiber type:Single-mode fiber
- Connector:LC/UPC
- Model:SM311LS
- Warranty:1 year
Our verdict“I rank the SM311LS first for its clear TP-Link gigabit use case and 20 km rating, but not for buyers who need 10Gbps or broad cross-vendor assurance.”
4-Pack 1.25G SFP LC Module 1000Base-LX Single-Mode Transceiver (SMF, 1310nm, 20km) for Cisco, Ubiquiti, Meraki, Fortinet, Mikrotik, TP-Link, Netgear, D-Link, Intel
When the job involves several gigabit links rather than one, this four-module 1000Base-LX pack offers the most practical bundle in the 1.25G group. Each module is specified for 1310nm single-mode fiber and up to 20 km, with dual LC connectors and power consumption below one watt. The wide device-brand list makes it appealing for mixed networks, though buyers still need to verify the exact switch or NIC model.
Compared with the Omada module, this pack offers more units and broader stated brand coverage, but it does not bring a speed or reach advantage. Compared with H!Fiber’s two-pack, it suits a rollout requiring four modules, while H!Fiber adds DDM monitoring and a stated longer warranty. The tradeoff is straightforward: the larger pack may leave spares unused, and its 1.25Gbps ceiling rules it out for 10Gbps uplinks. I would choose it for multiple compatible gigabit links, not for a single repair or a speed upgrade.
Pros:- Four modules support multiple link installations or replacements
- Each module is specified for a 20 km single-mode link
- Broad stated compatibility across several equipment brands
- Power consumption is listed as less than one watt
Cons:- Compatibility still needs verification with each specific device
- 1.25Gbps speed is unsuitable for 10Gbps links
- Four units may be unnecessary for a single-link requirement
Best for: Network owners installing or replacing several 1.25Gbps single-mode links across compatible equipment from different vendors.
Not ideal for: Buyers who need only one module, require 10Gbps, or need guaranteed compatibility without checking an exact device model.
- Pack size:4 modules
- Data rate:1.25Gbps
- Maximum reach:Up to 20 km
- Wavelength:1310nm
- Fiber type:Single-mode fiber
- Connector:Dual LC
- Power consumption:Less than 1W
- Operating temperature:0°C to 70°C
Our verdict“I would pick this pack over the Omada single module when several gigabit links need optics, but not when 10Gbps or device-specific certainty is the priority.”
4-Pack SFP+ 10GBase-LR LC Module, Single-Mode 1310nm, SMF Dual LC Fiber Optic Transceiver for Cisco, Ubiquiti, Meraki, Netgear, TP-Link, and More
This is the strongest fit for buyers who need to move beyond gigabit without giving up a stated 20 km reach. The four-pack uses SFP+ 10GBase-LR optics rated at 10Gbps or higher, with 1310nm single-mode fiber and LC-UPC interfaces. That makes it the only product here whose supplied specifications pair 10Gbps-class throughput with a 20 km maximum, a clear step up from the 1.25G modules when the switch and network demand more capacity.
Against H!Fiber’s 10G two-pack, this option has the longer stated reach and twice as many modules, but the H!Fiber product may suit a smaller two-ended link better. Against the gigabit products, the benefit is bandwidth, not universal compatibility: SFP+ ports are required, and vendor coding or device support may still matter. The 20 km figure also should not be read as a guarantee for every fiber route; check the optical budget and the far-end optic. I would skip it for a gigabit-only switch or a link that needs reach beyond 20 km.
Pros:- 10Gbps-class throughput over single-mode fiber
- Stated maximum reach of 20 km, the longest listed reach among the 10G options
- Four modules can cover several links or provide spares
- LC-UPC interface and 1310nm wavelength are specified
Cons:- Requires compatible SFP+ ports and verified device support
- The 20 km rating does not cover ultra-long-distance routes
- Four-module pack may be more than a small installation needs
Best for: Organizations that need multiple 10Gbps single-mode links and want a stated maximum reach of up to 20 km.
Not ideal for: Gigabit-only equipment, single-link buyers who do not need a four-pack, or routes longer than the specified 20 km.
- Pack size:4 modules
- Data rate:10Gbps or higher
- Maximum reach:20 km
- Fiber type:Single-mode fiber, OS2/OS3 listed
- Interface:LC-UPC
- Wavelength:1310nm
- Transmit power:-8.2 to 0.5dBm
- Operating temperature:0°C to 70°C
Our verdict“I place this first for 10Gbps long-range work because it combines the lineup’s highest stated speed with a 20 km reach, provided the SFP+ hardware is compatible.”
H!Fiber 1.25G Single Mode SFP LC Module, 1000Base-LX/LH Fiber Transceiver (2 Pack)
H!Fiber’s two-pack is a considered alternative to the Omada single module when a buyer needs optics at both ends of one gigabit fiber link. It supports 1.25Gbps over up to 20 km, uses 1310nm single-mode fiber, and lists DDM monitoring. Monitoring can help an administrator inspect optical information when supported by the host equipment; it is a useful distinction from the Omada listing, which does not mention DDM.
The package includes two modules and carries a stated three-year warranty, compared with the four-pack 1.25G option’s larger quantity and the Omada’s TP-Link-specific compatibility positioning. Its listed 1.05W consumption is slightly above the sub-one-watt figure of the other gigabit four-pack, and compatibility is still not guaranteed merely by a broad claim. As with those alternatives, it cannot serve a 10Gbps link. I would choose it for a paired gigabit connection where DDM and warranty coverage are valued, and pass if the network requires higher throughput.
Pros:- Two modules suit the two ends of a fiber link
- Stated reach up to 20 km at 1.25Gbps
- DDM monitoring is listed
- Three-year warranty is stated
Cons:- Limited to gigabit-class throughput
- Listed power consumption is 1.05W
- Fiber cabling is not included and device compatibility requires checking
Best for: Buyers connecting both ends of a 1.25Gbps single-mode link who value DDM monitoring and a stated three-year warranty.
Not ideal for: Anyone building a 10Gbps link, needing more than two modules, or lacking compatible fiber and device ports.
- Pack size:2 modules
- Data rate:1.25Gbps
- Maximum reach:Up to 20 km
- Wavelength:1310nm
- Fiber type:Single-mode fiber
- Interface:Duplex LC
- Power consumption:1.05W
- Warranty:3 years stated
Our verdict“I favor this pair over the Omada single unit when both ends need optics and DDM matters, but the 1.25Gbps limit keeps it out of 10G upgrades.”
H!Fiber 10G Single Mode SFP+ LC Module, 10GBase-LR Fiber Transceiver (2 Pack)
For a two-ended 10Gbps link where the route falls within its stated range, H!Fiber’s 10GBase-LR pair is the more compact alternative to the four-pack 10G option. It is specified for single-mode fiber at 1310nm, duplex LC connectors, and up to 10 km. The listing also names common network vendors and states power consumption below 1.05W, making it a plausible fit for a small number of compatible SFP+ ports.
The main compromise against the 4-pack SFP+ module is reach: that product is rated for 20 km, while this pair stops at 10 km. The smaller bundle is useful when only two optics are needed, but it does not offer the same reach headroom for longer routes. Compared with the 1.25G two-pack, it delivers 10Gbps-class speed but requires SFP+ equipment. The provided details do not list DDM for this model, unlike H!Fiber’s 1.25G module. I would confirm the device coding and link budget before choosing it for a 10 km installation.
Pros:- Two-module pack is suited to a single link’s endpoints
- Supports 10Gbps-class 10GBase-LR operation
- Stated single-mode reach up to 10 km
- Power consumption is listed below 1.05W
Cons:- Shorter stated reach than the four-pack 10G option
- Requires compatible SFP+ ports and single-mode cabling
- DDM monitoring is not specified in the supplied details
Best for: Buyers who need two 10Gbps SFP+ modules for a single-mode link no longer than the stated 10 km reach.
Not ideal for: Routes beyond 10 km, gigabit-only ports, or installations needing four or more optics.
- Pack size:2 modules
- Standard:10GBase-LR
- Maximum reach:Up to 10 km
- Wavelength:1310nm
- Fiber type:Single-mode fiber
- Connector:Duplex LC
- Power consumption:Less than 1.05W
- Compatibility:Cisco, Meraki, Ubiquiti, Mikrotik, Netgear, D-Link, and more
Our verdict“I would select this pair over the 20 km 10G four-pack only when two modules and a 10 km reach match the installation more closely.”
How We Picked
I compared the five modules against the specific job in the title: carrying Ethernet over single-mode fiber for a long-range link. My ranking gives weight to the stated maximum reach, supported data rate, and how clearly the product information describes its intended network fit. A longer reach is useful only if the module can run in the ports at both ends, so I also considered whether compatibility is brand-specific or described more broadly.
I treated SFP and SFP+ as distinct port classes, rather than ranking a 10Gbps module as an automatic upgrade for every buyer. The 1.25G products target gigabit links, while the two SFP+ choices target higher throughput. Pack size matters as well: a four-pack can simplify a multi-link rollout, but it is a poor fit when only one replacement is needed. Monitoring, power information, warranty details, and connector specifications helped separate otherwise similar 1310nm, duplex-LC products.
The supplied details do not establish compatibility with every revision of every named switch, nor do they provide a complete optical link budget for each product. I have not treated broad brand lists or maximum-distance claims as a guarantee for a particular installation. Before ordering, I would check the device’s supported transceiver list, the port’s speed, fiber type and connector, and the specifications of the optic at the opposite end. The ordering below reflects those practical differences, with useful reach and clear fit ahead of bundle size alone.
| single mode sfp modules for long range link | Fiber type | Connector |
|---|---|---|
| Omada 1.25GBase-LX SMF | Single-mode fiber | LC/UPC |
| 4-Pack 1.25G SFP LC Module 100 | Single-mode fiber | Dual LC |
| 4-Pack SFP+ 10GBase-LR LC Modu | Single-mode fiber, OS2/OS3 listed | — |
| H!Fiber 1.25G Single Mode SFP | Single-mode fiber | — |
| H!Fiber 10G Single Mode SFP+ L | Single-mode fiber | Duplex LC |
Factors to Consider When Choosing Single Mode Sfp Modules For Long Range Links
I would choose a long-range SFP module by matching the complete link—not by picking the largest distance number in a product title. These checks separate the gigabit options from 10Gbps SFP+ models and help prevent a module from being ordered for an incompatible port.Match the port class and data rate
Start with the equipment at both ends. The Omada and H!Fiber gigabit modules, plus the 1.25G four-pack, target 1.25Gbps SFP links. The other two products are 10Gbps SFP+ optics. An SFP+ module is not automatically a suitable replacement for a gigabit SFP module; port support varies by device, and the port may have a fixed speed or specific transceiver requirements. I would check the switch or router documentation and confirm the intended link speed before choosing a pack.
Treat reach as a specified ceiling, not a promise
Four listings state up to 20 km, while H!Fiber’s 10G pair is rated to 10 km. Those numbers help narrow the field, but the real link depends on the fiber route, connectors, splices, patch panels, and the optical characteristics of both modules. A long route with multiple connection points can behave differently from a simple point-to-point run. For an important or near-limit link, I would check transmit power, receiver sensitivity, and the fiber path’s loss against both ends’ specifications.
Confirm single-mode fiber and connector details
All five products are intended for single-mode fiber, and each lists a 1310nm wavelength. Connector details include LC/UPC, dual LC, LC-UPC, or duplex LC; check the exact interface and polish required by the installed patch leads. The module is only one part of the physical connection. Make sure the cable type and connectors match, and do not assume a single-mode module can be used with an existing multimode run simply because the transceiver fits the cage.
Check compatibility at both ends
Broad compatibility lists are a useful starting point, not a device-level guarantee. Some switches restrict third-party optics or require particular module coding, while other ports may support a wider range. The Omada SM311LS has the clearest TP-Link positioning in this group; the other listings name multiple brands, but buyers should still look up the exact model and software requirements. Both ends of a link need compatible optics with suitable speed and optical specifications. I would verify both hosts before ordering, especially for the 10G SFP+ products.
Choose pack size and monitoring for the job
A single module fits a targeted replacement when the far end already has a compatible optic. A two-pack can serve both ends of one connection, and a four-pack makes more sense for several links or planned spares. Pack quantity does not improve reach or speed. DDM is specifically listed for H!Fiber’s 1.25G pair and can provide optical diagnostics where the host supports it; it is not listed for every product here. Compare that feature, warranty information, and power draw only after the link speed and compatibility are settled.
Frequently Asked Questions
Which module in this roundup has the longest stated reach?
Four options are specified for up to 20 km: the Omada SM311LS, the 1.25G four-pack, the 10G SFP+ four-pack, and H!Fiber’s 1.25G two-pack. H!Fiber’s 10G pair is specified for up to 10 km. The 20 km figure is a product rating, not a guarantee that every installed route will work at that distance; fiber loss, connectors, and the matching optic at the far end matter.
Can I use an SFP+ module in any SFP port?
No. SFP and SFP+ refer to different port and speed capabilities, and support depends on the host device. The 10G options in this guide need compatible SFP+ hardware for 10Gbps operation, while the 1.25G products are intended for gigabit SFP links. I would check the exact switch or router documentation rather than assuming the module will work because its shape fits the slot.
Do both ends of the fiber link need matching modules?
Both ends need optics that can communicate over the same fiber with compatible speed, wavelength, connector arrangement, and optical characteristics. They do not always need to be the same product brand, but the pair must be designed to work together and be supported by each device. For the options here, I would confirm the far-end optic’s specifications and the host compatibility before relying on a link.
What is the practical difference between the 10G options?
The four-pack 10GBase-LR option is specified for up to 20 km and supplies four modules, making it the better fit for multiple longer 10Gbps links. H!Fiber’s 10G pair supplies two modules and is rated up to 10 km, which better matches a single link within that reach. Both require compatible SFP+ ports, so the shorter-range pair is not a gigabit substitute and the 20 km pack is not an ultra-long-distance optic.
What should I verify before ordering a long-range SFP module?
I would check the port speed and SFP or SFP+ class at both ends, device-specific transceiver support, the cable’s single-mode type, connector and polish, and the route length. Then compare the expected fiber loss with the transmitter and receiver specifications and confirm that the two optics are compatible. This avoids relying on a maximum-reach label when the installed fiber path or hardware does not meet the module’s requirements.
Conclusion
My pick depends on the network’s speed and the number of links. For a TP-Link gigabit connection, I would choose the Omada SM311LS for its clear device fit and stated 20 km reach. For several gigabit links across compatible brands, the 1.25G four-pack is the more practical bundle; for one paired gigabit link with monitoring and a stated three-year warranty, H!Fiber’s 1.25G two-pack is the better match.
For 10Gbps, I would choose the 10G SFP+ four-pack when the route needs up to 20 km and multiple modules are useful. H!Fiber’s 10G pair is the more focused choice for a two-module link within its 10 km rating. In every case, I would confirm port support, fiber and connector compatibility, and the far-end optic before placing an order. That check matters more than choosing a module with a reach figure that exceeds the actual needs of the link.
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