What makes the SFP-25GER-31 special?

It is built for long distances. It lets you send massive 25Gbps data up to 40km away over a single pair of fiber cables.

Why does this module use a 1310nm wavelength?

The 1310nm light wavelength is perfect for single-mode fiber because it keeps the signal clear and strong over long distances.

What type of internal laser and receiver architecture does this module use?

The SFP-25GER-31 25G module integrates an Electro-absorption Modulated Laser (EML) transmitter and a highly sensitive Avalanche Photodiode (APD) receiver with a Transimpedance Amplifier (TIA) to ensure stable long-range signaling.

What is the typical power consumption of this long-range 25G SFP28 transceiver?

Due to the extended-reach EML and APD components, it typically consumes approximately 1.8W under standard operating conditions (3.3V supply).

Does this SFP28 module work for high-speed storage area networks running 32G Fibre Channel?

No, this is specifically tuned for 25G Ethernet and CPRI protocols, not for Fibre Channel environments.

What is the maximum guaranteed transmission distance for this SFP28 single-mode optics module?

The module safely supports links up to 40km (25GBASE-ER standard) over standard G.652 single-mode fiber, assuming normal splice and connector loss.

Will this module overheat if I populate 48 ports side-by-side in a high-density 1U switch?

No, this optical module uses an optimized low-power design (under 1.8W) to prevent heat buildup in dense switch layouts.

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FS SFP-25GER-31 Compatible LINK-PP 25G SFP28 1310nm 40km Duplex LC/UPC DOM SMF Optical Transceiver Module

Name: FS SFP-25GER-31 Compatible LINK-PP 25G SFP28 1310nm 40km Duplex LC/UPC DOM SMF Optical Transceiver Module
Brand: LINK-PP
SKU: 214565
Price: 130.72 USD
Availability: InStock
Rating: 4.8 (15 reviews)

# 214565

Product: FS SFP-25GER-31 Compatible LINK-PP 25G SFP28 1310nm 40km Duplex LC/UPC DOM SMF Optical Transceiver Module
SKU: 214565
P/N: LS-SM3125-40C
Price: $ 152
Stock: 943 in Stock
Sold: 550
Product URL: https://www.l-p.com/products/493981.htm

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Manufacture: LINK-PP

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Compatible:: Cisco; LINK-PP; Arista; Brocade; DELL; FS; H3C; HPE Aruba; Intel; Juniper; Mellanox; Netgear

Compatible P/N:: SFP-25GLRL-31-I | 2km; SFP-25GLR-31 | 10km; SFP-25GLR-31-I | 10km; SFP-25GMLR-31-I | 10km; SFP-25GERL-31 | 30km; SFP-25GERL-31-I | 30km; SFP-25GER-31 | 40km; SFP-25GER-31-I | 40km

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FS SFP-25GER-31 Compatible LINK-PP 25G SFP28 Specifications

SFP-25GER-31 is a 25G SFP28 duplex LC/UPC optical transceiver engineered for long-haul single-mode fiber (SMF) transmissions, delivering pinpoint 1310nm wavelength signaling up to 40km with an optimized maximum power consumption of just 1.8W and integrated DOM capabilities.

FS Part Number	SFP-25GER-31	Vendor Name	LINK-PP
Form Factor	SFP28	Max Data Rate	25.78Gbps
Wavelength	1310nm	Max Cable Distance	40km
Connector	Duplex LC	Media	SMF
Transmitter Type	EML	Receiver Type	APD/TIA
Receiver Sensitivity	-19dBm	Operating Temperature range	0°C to +70°C
Protocols	MSA Compliant, CPRI, eCPRI	Warranty	5 Years

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Q: Does this SFP28 module work for high-speed storage area networks running 32G Fibre Channel? By J***r on 2026-02-15

A: No, this is specifically tuned for 25G Ethernet and CPRI protocols, not for Fibre Channel environments. By admin on 2026-02-15
Q: What is the maximum guaranteed transmission distance for this SFP28 single-mode optics module? By H***t on 2025-10-30

A: The module safely supports links up to 40km (25GBASE-ER standard) over standard G.652 single-mode fiber, assuming normal splice and connector loss. By admin on 2025-10-31
Q: Will this module overheat if I populate 48 ports side-by-side in a high-density 1U switch? By R***e on 2025-08-28

A: No, this optical module uses an optimized low-power design (under 1.8W) to prevent heat buildup in dense switch layouts. By admin on 2025-08-29

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L***g

Taiwan, Province of China

Verified Purchase

5 .0

2026-04-16

Enterprise-grade module at a fraction of OEM cost. Our IT procurement team was hesitant about third-party 40km ER optics, but these Link-PP SFP28 25G transceivers cleared all compliance checks. Low 1.8W power consumption keeps the rack temperature down.

144 Helpful vote Comments

S***s

France

Verified Purchase

5 .0

2026-04-01

Impressive 25G link budget. Deployed on a 30km single-mode fiber span with multiple splice points. Was worried about attenuation but the high-performance EML transmitter punched right through. Links have been up for 35 days straight.

130 Helpful vote Comments

U***y

Australia

Verified Purchase

5 .0

2026-03-16

We manage the IT infrastructure for a large automated warehouse facility where downtime is not allowed. We deployed these 25G SFP28 1310nm 40km modules to link our main server room to edge switches across the property. Even though these are commercial-grade (0-70°C), they are housed in outdoor enclosures and handle minor temperature shifts with no issues. The 25Gbps speed easily handles hundreds of HD security cameras and heavy data traffic at the same time. Very durable and great value.

125 Helpful vote Comments

J***y

New Zealand

Verified Purchase

5 .0

2026-03-07

Great 25G optics for campus distribution! Installed a batch of these LS-SM3125-40C SFP28 transceivers to bridge two single-mode hub sites about 32km apart. APD receiver sensitivity is great, getting a rock-solid -16dBm. Perfect budget alternative!

69 Helpful vote Comments

Y***t

Spain

Verified Purchase

4 .0

2026-01-16

These 25Gbps single-mode fiber modules perform exactly as advertised. Got full 25G throughput over our 35km link. The plastic pull-tab on the duplex LC connector is a little stiff on first use, making it slightly tricky to unlatch from our older, high-density patch panels. Works fine after a few insertions though!

17 Helpful vote Comments

G***m

Bangladesh

Verified Purchase

5 .0

2026-01-04

Amazing price for 40km span. These EML 1310nm lasers run cooler than expected! (^_^)

46 Helpful vote Comments

T***e

Canada

Verified Purchase

5 .0

2025-12-22

Awesome supplier for networking gear. We buy networking components in bulk for the corporate campus network. These 25G SFP28 transceivers are our new standard for long-range intra-building links. Excellent build quality.

95 Helpful vote Comments

K***s

Lithuania

Verified Purchase

5 .0

2025-11-24

Rock solid DOM monitoring. Deployed these 25GBASE-ER modules for our regional ISP nodes. The built-in Digital Optical Monitoring (DOM) makes it easy to track real-time laser bias and temperatures via SNMP. Will buy more for next month's fiber rollout!

72 Helpful vote Comments

X***r

Italy

Verified Purchase

5 .0

2025-10-19

Our healthcare network needed more bandwidth between the main hospital campus and our off-site backup center (about 28km away). We swapped out our old 10G modules for these Duplex LC SMF transceivers. The installation was super easy: we plugged them in, and the links came up instantly at 25.78 Gbps. Thanks to the built-in DOM, we verified the optical signal levels right away without needing an external power meter. Our backup windows are now twice as fast, and the switches run at completely normal temperatures.

119 Helpful vote Comments

M***e

Brunei Darussalam

Verified Purchase

5 .0

2025-09-12

Great specs on these 25G single-mode optics. EML laser is highly accurate at 1310nm. Tested across a 34km long-haul dark fiber link and the link budget has plenty of headroom. Perfect for high-density fiber patch panels.

96 Helpful vote Comments

N***y

United States

Verified Purchase

5 .0

2025-08-15

Best cost-per-gigabit for 40km links. Buying OEM 25GBASE-ER modules would have blown our entire Q3 budget. These LINK-PP 25G SFP28 40km transceivers deliver identical performance for way less. Shipping to the US was fast, too.

61 Helpful vote Comments

Z***h

Russian Federation

Verified Purchase

4 .0

2025-08-11

These 25G SFP28 modules are fully MSA compliant, but on our older switches, the link light takes about 10 seconds to turn on after hot-plugging. Once the handshake finishes, the throughput is rock-solid with zero errors. Just be patient when you first plug them in!

21 Helpful vote Comments

Z***h

Brazil

Verified Purchase

4 .0

2025-05-23

The 1310nm 40km EML laser output is excellent and DOM works fine. My only minor complaint is that a couple of the dust caps over the duplex LC ports had slipped off during transit. Had to use our fiber scope to verify the optical interfaces were clean before installing. Performance is flawless though.

36 Helpful vote Comments

D***r

Bulgaria

Verified Purchase

5 .0

2025-05-11

Solid SFP28 modules. 40km ER optics working like a charm on our campus fiber ring setup.

28 Helpful vote Comments

I***n

Morocco

Verified Purchase

5 .0