The LINK-PP LS-BL31552G-20I delivers consistent 2.5Gbps performance across single-mode fiber links up to 20km. With operating wavelengths of 1310nm for transmission and 1550nm for reception, this industrial-grade BiDi SFP enables two-way communication over a single strand, improving fiber efficiency and lowering deployment overhead.
LINK-PP Part Number
LS-BL31552G-20I
Vendor Name
LINK-PP
Form Factor
SFP
Max Data Rate
2.5Gbps
Wavelength
1310nm-TX/1550nm-RX
Max Cable Distance
20km
Connector
Simplex LC
Media
SMF
Transmitter Type
DFB
Receiver Type
PIN
TX Power
-5 to 0dBm
RX Power
-23 to -1dBm
Receiver Sensitivity
<-18dBm
Receiver Overload
-1dBm
Operating Temperature Range
-40 to 85°C
Protocols
Fast Ethernet, Gigabit Fibre Channel, MSA Compliant
Key Features of LINK-PP LS-BL31552G-20I 2.5G SFP BiDi
The LINK-PP LS-BL31552G-20I is a 2.5G SFP BiDi transceiver designed for reliable full-duplex communication via a single fiber at speeds of up to 2.5 Gbps and distances of up to 20 km. Its hot-swappable SFP design streamlines installation and maintenance, while integrated Digital Optical Monitoring (DOM) offers real-time performance insights to enhance network management.
The LINK-PP LS-BL31552G-20I optical module features a high-performance DFB laser transmitter and a PIN/TIA receiver to ensure reliable, bidirectional optical communication. Its carefully matched wavelength pairing enhances signal stability while minimizing interference and transmission loss.
LS-BL31552G-20I: Reliable 2.5 Gbps Connectivity for Efficient Fiber Networks
The LINK-PP LS-BL31552G-20I 2.5G SFP BiDi module supports data rates of up to 2.5Gbps over single-mode fiber, enabling efficient optical networking over distances of up to 20km. It is ideal for enterprise and industrial environments requiring stable, long-distance communication.
LS-BL31552G-20I Module with 1310nm-TX/1550nm-RX Wavelength
Featuring 1310nm-TX and 1550nm-RX wavelengths, this LINK-PP LS-BL31552G-20I unit provides bidirectional transmission over one fiber, improving transmission stability and decreasing signal interference for consistent optical performance.
The LINK-PP LS-BL31552G-20I 2.5G SFP BiDi module enables stable and efficient long-range optical networking with support for transmission distances up to 20 kilometers.
LS-BL31552G-20I Module with Simplex LC Interface
By eliminating the need for separate transmit and receive ports, the simplex LC interface lowers fiber usage, unclutters cable management, and cuts total deployment spending.
LS-BL31552G-20I Module with DOM for Real-Time Monitoring
The LINK-PP LS-BL31552G-20I 2.5G SFP BiDi module provides real-time DOM support for continuous monitoring of key operating parameters, such as temperature, voltage, transmit power, and receive power. This delivers stronger performance control and a faster response to potential network issues.
LINK-PP modules are produced in compliance with ISO 9001 quality management standards and satisfy CE, RoHS, and FCC certification requirements, guaranteeing safety, environmental compliance, and dependable performance in global deployments.
Comprehensive validation procedures ensure each module delivers consistent functionality across diverse network infrastructures.
LS-BL31552G-20I Quality Certifications
We adhere to strict international quality assurance and manufacturing standards at every stage of the production process for LINK-PP optical modules.
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-BL31552G-20I Certified for Reliable Host-Device Compatibility
Full compatibility validation supports plug-and-play functionality and reliable operation across LINK-PP devices.
Rigorous Testing Ensures Reliable SFP Performance
LINK-PP's exhaustive validation process guarantees high uptime and consistent performance. Visit the LINK-PP Test Support Center for further details.
Optical Spectrum Test
Optical spectrum validation confirms wavelength precision and compliance with strict transmission standards.
Eye Pattern Test
Eye diagram analysis verifies signal clarity and waveform integrity for enhanced communication reliability.
Bit Error Rate Test
BER testing helps ensure low transmission error rates and stable optical performance.
Temperature Test
Environmental temperature testing confirms the module's stable performance over a wide temperature range.
Product Shipping for LINK-PP LS-BL31552G-20I 2.5G SFP BiDi
Each LINK-PP module is packaged and shipped for immediate deployment through a reliable logistics system that safeguards product integrity and ensures timely global delivery.
Anti-Static Protective Packaging
Uses specialized ESD-safe materials to reduce the risk of electrostatic damage during transport.
Shock-Resistant Transport Protection
Provides secure cushioning to keep products safe and intact throughout shipping.
Fast Order Processing and Dispatch
Ensures quick confirmation, careful packing, and prompt shipment release.
Global Logistics and International Delivery
Relies on trusted worldwide carriers for reliable and on-time delivery.
The LINK-PP LS-BL31552G-20I 2.5G SFP BiDi is appropriate for SDH STM-16 systems, SONET OC-48 systems, 2x Fiber Channel applications, routers, switches, server interfaces, and industrial Ethernet environments. It works especially well in scenarios requiring long-distance transmission, reduced fiber usage, and stable performance in demanding conditions.
LS-BL31552G-20I 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 LS-BL31552G-20I 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:
The industrial-grade FP (Fabry-Perot) BiDi optical sub-assembly is built with internal thermal compensation circuitry and temperature-stabilized laser drivers. This ensures that the 1310nm transmit center wavelength and optical output power (-5 to 0dBm) remain stable without frequency drift or power drops across the entire -40°C to 85°C operating range. By
admin on
2026-04-27
A:
No attenuator is strictly required for short bench tests. The maximum transmitter output power of this module is 0dBm, while the receiver overload threshold is -1dBm. Since the max TX power does not exceed the receiver overload limit, connecting a short patch cable will not saturate or damage the optical receiver photodiode. By
admin on
2025-02-14
A:
Yes, the module features full SFF-8472 compliance for Digital Optical Monitoring (DOM/DDM). Any switch or router that supports standard SFF-8472 MSA telemetry (such as MikroTik, Ubiquiti, Juniper, HP, or Arista) will display real-time metrics including TX/RX optical power, operating temperature, supply voltage, and laser bias current. By
admin on
2025-02-12
A:
No, because this module transmits at 1310nm and receives at 1550nm, the opposite end of the single fiber strand must use a complementary BiDi module that transmits at 1550nm and receives at 1310nm (such as a 1550TX/1310RX 2.5G SFP). Connecting two identical 1310TX/1550RX modules together will result in both ends transmitting on the same wavelength and no optical link will be formed. By
admin on
2024-09-21
A:
This module is engineered for 2.5Gbps optical links as well as specific Gigabit Fibre Channel / Fast Ethernet protocol applications as noted in MSA specs. However, it does not feature automatic hardware rate down-speeding. The host switch port must support 2.5G SFP operation or allow manual port speed configuration to 2.5Gbps for a successful link. By
admin on
2024-08-28
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485569
454573
R***s
Cambodia
Verified
Purchase
4 .0
2026-07-10
The LS-BL31552G-20I modules perform flawlessly over our 12km single-strand fiber link with strong 2.5G throughput. However, the outer cardboard shipping box was slightly crushed on one corner during transit. Thankfully, the internal anti-static blister packaging protected the simplex LC optics perfectly. Great product overall.
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485569
454592
A***n
United Arab Emirates
Verified
Purchase
4 .0
2026-05-28
Solid 1310nm-TX 1550nm-RX BiDi transceivers for industrial environments. Link established right away on our switch. My only minor complaint is that the dust cap on one module was a bit loose inside the packaging. Once cleaned and plugged in, signal levels and DDM readings have been perfect.
Please write comments with more than three
character.
485569
454583
S***r
Macao
Verified
Purchase
5 .0
2026-05-13
Outstanding single-mode WDM transceivers for edge distribution nodes. The FP BiDi transmitter outputs a clean -3dBm signal, giving us clean 2.5Gbps throughput across 14km of dark fiber. The simplex LC connector latching mechanism is durable and fits snug. SFF-8472 telemetry provides accurate real-time light level logging into our NMS. =D
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485569
454587
S***n
France
Verified
Purchase
5 .0
2026-04-22
Essential optic for single-fiber expansion. Paired with the matching 1550TX module across a 18km span with multiple splices. Received optical power sat comfortably at -14dBm, well above the -18dBm sensitivity floor. Full MSA compliance allowed effortless plug-and-play operation in our mixed Cisco and Juniper switch environment. Very satisfied with LINK-PP quality. ;)
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485569
454585
E***z
Hong Kong
Verified
Purchase
5 .0
2026-04-07
Great cost-effective alternative to OEM 2.5G single-strand transceivers. We ran a BERT test across 20km of SMF cable, and frame loss remained strictly zero. The FP BiDi optics handle optical reflection well over simplex LC/UPC patch leads. Perfect solution when you need to double your existing fiber capacity without laying new cables. :-)
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485569
454589
T***g
Spain
Verified
Purchase
5 .0
2026-04-01
Deployed these in a dual-homed industrial ring topology connecting remote solar farms. The wide operating temperature range (-40 to 85℃) is vital for desert sites. The 1310nm TX laser locks frequency without thermal drift. Instant compatibility with our industrial managed switches. They perform identically to higher-priced enterprise brand optics.
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character.
485569
454567
B***s
Israel
Verified
Purchase
5 .0
2025-11-08
Replaced standard duplex SFPs with these LINK-PP WDM transceivers to free up fibers in our main trunk. Optical budget easily cleared the 12km link length.
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485569
454570
N***z
Germany
Verified
Purchase
5 .0
2025-07-09
Great DOM implementation on these SFF-8472 modules. Real-time optical power and temperature readouts sync perfectly with our Zabbix monitoring tool. =)
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485569
454580
E***e
Finland
Verified
Purchase
5 .0
2025-06-20
We utilized the LS-BL31552G-20I for a rural wireless backhaul link where fiber cores were strictly limited. Running 1310nm-TX and 1550nm-RX over a single SMF strand saved us thousands in lease fees. The industrial -40 to 85°C rating keeps the link rock-solid inside roadside cabinets during severe heatwaves. Seamless DOM integration in CLI.
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485569
225827
M***n
United States
Verified
Purchase
5 .0
2025-04-14
Really happy with my purchase. This is the first time that i purchase Transceiver Modules online. The product was send really Fast. I will continue purchase with your.
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485569
454566
W***s
Brunei Darussalam
Verified
Purchase
5 .0
2025-02-20
These 20km 2.5G BiDi SFPs solved a huge bandwidth bottleneck between our server building and storage array. Using 1310nm transmit / 1550nm receive on a single strand allowed us to double our trunk capacity immediately. Optical budget was spot on with plenty of margin against receiver overload (-1dBm). Fantastic industrial hardware!
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485569
225829
T***t
Poland
Verified
Purchase
5 .0
2025-01-30
Deployed LS-BL31552G-20I modules in outdoor wireless cell tower enclosures. The -40 to 85℃ temperature tolerance handles frozen winter mornings with zero drift.
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485569
225839
B***s
India
Verified
Purchase
5 .0
2024-10-25
Needed 2.5Gbps throughput over a single fiber strand for an industrial camera network. Simplex LC connection snapped right in and DOM monitoring gave clear light levels. ;)
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485569
454582
T***a
Taiwan, Province of China
Verified
Purchase
5 .0
2024-09-14
Your web store is great, with compatibility info and all payment options included for effective B2B model.It would be useful if you added Inco-terms on proforma and shipment invoices for customs purposes.
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485569
225837
L***r
South Africa
Verified
Purchase
5 .0
2024-08-01
Used these 2.5G single mode transceivers for enterprise switch uplinks in a harsh factory environment. Solid casing and reliable data rates throughout. :-D
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485569
454579
D***s
Thailand
Verified
Purchase
5 .0
2024-07-01
We deployed a batch of these industrial BiDi SFP transceivers for traffic monitoring camera links along a highway corridor. Cold starts at -25°C showed no optical power degradation. DDM stats were accurately reported via SNMP. Max data rate holds steady at 2.5Gbps with zero bit errors. Excellent build quality for harsh outdoor cabinet setups.
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485569
454588
P***r
Bangladesh
Verified
Purchase
5 .0
2024-06-22
Have made many purchase with l-p.com. They are very through with making sure the correct products ordered for correct and working. The product shipped from directly China and arrived quickly.
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