1.25G BiDi SFP Module, Gigabit SC SMF 10km DDM Transceiver Pair

Product Overview

The Luleey 1.25G BiDi SFP Module is designed for Gigabit Ethernet transmission over single mode single fiber. It uses BiDi wavelength division technology to transmit and receive optical signals through one SC simplex fiber connection, helping network engineers reduce fiber core usage while maintaining stable 1.25Gbps optical performance.

This 10km version is designed for short-to-medium distance single-fiber links where a 20km or 40km optical budget is not required. It is suitable for office buildings, small campus networks, security systems, IP camera networks, weak-current cabinets, ODF cabling, fiber media converters, routers, switches, and access network extension.

Unlike standard dual-fiber SFP modules that require two fiber cores, this Gigabit SFP SC Module uses a 1310nm/1550nm wavelength pair over one single mode fiber. It is supplied as a matched pair, making it suitable for point-to-point Gigabit fiber links where fiber resources are limited.

Compared with the 20km version, the 10km version is better for shorter routes and cost-sensitive projects. It provides enough reach for many enterprise, building, campus, and surveillance network applications without using a higher optical budget module unnecessarily.

Luleey provides compatibility options for major switch, router, firewall, and media converter platforms, helping users deploy stable 1G single-fiber links across different network environments.

Features

• 1.25G BiDi SFP Module for Gigabit single-fiber transmission
• Supplied as a matched transceiver pair
• SC simplex interface for single fiber deployment
• 1310nm / 1550nm wavelength pair
• Supports up to 10km transmission over single mode fiber
• DDM digital diagnostic monitoring support
• 1.25Gbps optical transmission speed
• 3.3V SFP operating voltage
• Designed for short-to-medium distance single-fiber Ethernet links
• SC connector design for ODF, telecom room, access network, and weak-current cabinet deployment
• Compatible with Gigabit switches, routers, firewalls, media converters, servers, and fiber network cards
• Compatible coding options for Cisco, Huawei, MikroTik, Ubiquiti, ZTE, HPE-Aruba, Juniper, Intel, TP-Link, H3C, and more
• Helps save fiber cores compared with dual-fiber SFP modules
• Factory tested by Luleey for stable optical performance

Applications

• Gigabit Ethernet Fiber Links
• Single Fiber Network Deployment
• Short Building-to-Building Fiber Links
• Office Network Fiber Extension
• Campus Fiber Links
• Security and IP Camera Networks
• ODF Fiber Distribution Systems
• Telecom Room Fiber Access
• Fiber Media Converter Deployment
• Router-to-Switch Fiber Connection
• Switch-to-Switch Gigabit Uplink
• Network Firewall Fiber Connection
• Weak-Current Cabinet Installation
• Short-to-Medium Distance Ethernet Extension

Specifications

Why Choose a 10km 1.25G BiDi SFP Module?

A 10km 1.25G BiDi SFP Module is useful when a network needs Gigabit fiber transmission over one single mode fiber core, but the actual fiber route does not require a 20km or 40km module.

This helps users:

• Save fiber core resources
• Reduce cabling cost
• Extend Gigabit Ethernet beyond copper cable limits
• Build simple point-to-point single-fiber links
• Avoid overusing higher optical budget modules
• Deploy stable fiber links for buildings, campuses, security systems, and access networks

For short-to-medium distance Ethernet links, the Luleey 10km Single Fiber SFP Module provides a practical balance between cost, reach, compatibility, and fiber resource efficiency.

10km vs 20km vs 40km BiDi SFP Module

10km, 20km, and 40km BiDi SFP modules all support 1.25G single-fiber transmission, but they are designed for different optical budgets.

Choose the 10km SFP Module when the fiber route is within 10km and the link loss is low.

Choose the 20km or 40km version when the route is longer or when the fiber path includes more connectors, patch panels, adapters, ODF points, or passive loss.

How BiDi SFP Transmission Works

BiDi means bidirectional transmission. A BiDi SFP module transmits and receives optical signals over one fiber core by using two different wavelengths.

A typical 1.25G BiDi pair works like this:

| Side | Transmit Wavelength | Receive Wavelength |
|—|—|
| Side A | 1310nm | 1550nm |
| Side B | 1550nm | 1310nm |

Because of this wavelength pairing, BiDi SFP modules must be used in matched pairs. Two modules with the same TX/RX direction will not create a normal link.

SC BiDi SFP vs LC BiDi SFP

Both SC and LC BiDi SFP modules can support single-fiber Gigabit transmission, but they are used in different cabling environments.

Choose the SC version when your existing fiber cabling, patch panel, or optical distribution frame uses SC connectors.

Choose the LC version when your equipment or patching system is based on LC interfaces.

1.25G BiDi SFP vs Standard Dual-Fiber SFP

| Module Type | Fiber Usage | Best For |
|—|—|
| Standard Dual-Fiber SFP | Uses two fiber cores | Normal Gigabit fiber links with enough fiber resources |
| 1.25G BiDi SFP Module | Uses one fiber core | Single fiber links and fiber-saving deployments |

Choose a BiDi SFP module when only one fiber core is available or when you want to reduce fiber usage.

Choose a standard dual-fiber SFP module when your fiber infrastructure already provides two available fiber cores.

Compatibility Notes

Luleey can provide compatible coding for different switch, router, firewall, and media converter platforms. Before ordering, please confirm the device brand and model to ensure correct recognition and stable operation.

Common compatibility options include Cisco, Huawei, MikroTik, Ubiquiti, ZTE, HPE-Aruba, Juniper, Intel, H3C, TP-Link, Arista, Brocade, Extreme, Mellanox, and General coding.

Important Pairing Notes

This 1.25G SFP Transceiver should be used with the correct opposite wavelength module. A 1310nm TX / 1550nm RX module should be paired with a 1550nm TX / 1310nm RX module.

Before deployment, confirm:

• The fiber type is single mode
• The connector type is SC
• The link distance is within 10km
• The two modules are matched A/B wavelength pairs
• The host device supports 1G SFP modules
• The compatibility coding matches the switch or router brand
• The optical budget is suitable for the actual fiber link loss
• DDM monitoring is required or supported by the host device

FAQ

What is a 1.25G BiDi SFP Module?

A 1.25G BiDi SFP Module is a Gigabit optical transceiver that transmits and receives data over one single mode fiber core using two different wavelengths.

What is this Gigabit SFP SC Module used for?

It is used for Gigabit Ethernet fiber links, switches, routers, media converters, network firewalls, ODF systems, telecom rooms, security networks, and short-to-medium distance building-to-building fiber connections.

Does this module use one fiber or two fibers?

It uses one single mode fiber core through an SC simplex connector.

Does this product come as a pair?

Yes. This product should be supplied as a matched BiDi transceiver pair.

What wavelengths does this module use?

It uses a 1310nm / 1550nm wavelength pair. The opposite side must use the reversed wavelength direction.

What is the transmission distance?

This version supports up to 10km transmission over suitable single mode fiber.

What is the difference between the 10km and 20km versions?

The 10km version is suitable for shorter fiber routes and lower-loss links. The 20km version provides more optical budget for longer links or routes with higher passive loss.

Does it support DDM?

Yes. DDM allows monitoring of optical power, temperature, voltage, and laser status when supported by the host device.

What is the difference between SC and LC BiDi SFP modules?

SC BiDi SFP modules are often used with ODF systems, media converters, telecom rooms, and access networks. LC BiDi SFP modules are more common in high-density switches and compact optical equipment.

Is it compatible with Cisco, Huawei, MikroTik or Ubiquiti?

Luleey can provide compatible coding for Cisco, Huawei, MikroTik, Ubiquiti, ZTE, HPE-Aruba, Juniper, Intel, TP-Link, H3C, and other platforms.

Can I use it with multimode fiber?

No. This module is designed for single mode fiber.

Can I use two same-side BiDi modules together?

No. BiDi modules need matched A/B wavelength pairs. Two modules with the same TX/RX direction will not work correctly.

Why choose Luleey 10km 1.25G BiDi SFP modules?

Luleey 10km 1.25G BiDi SFP modules provide cost-effective single-fiber Gigabit transmission, DDM monitoring, compatible coding options, and factory-tested optical performance for stable enterprise, campus, security, telecom, ODF, and media converter deployment.