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SFP Module Types: A Complete Guide to All SFP Transceivers (2026)

Introduction

With so many SFP modules available, choosing the right type can be confusing.

👉 Selecting the wrong module may cause:

  • Compatibility issues

  • Performance limitations

  • Increased costs

This guide will help you understand all major SFP module types and how to choose the right one.

What Is an SFP Module?

An SFP (Small Form-factor Pluggable) module is a compact, hot-swappable transceiver used in networking equipment.

👉 It enables data transmission between:

  • Switches

  • Routers

  • Servers

Main SFP Module Types

1. Standard SFP (1G)

  • Speed: up to 1 Gbps

  • Used in: legacy and basic networks

Full name: Small Form-factor Pluggable (SFP), a Gigabit (1Gbps) standard optical/electrical transceiver module.
Core positioning: Physical layer interface for network devices (switches, routers, network interface cards, etc.), enabling electrical-to-optical/optical-to-electrical signal conversion and adapting to Gigabit Ethernet (1GbE).
Key Features
Hot-pluggable: Can be directly inserted or removed while the device is powered on without shutting it down.
Compact: Half the size of a GBIC module, increasing port density.
Standardized: Compliant with MSA, SFF, and IEEE standards, ensuring cross-vendor compatibility.
Dual media support: Compatible with optical fibers (multimode/single-mode) and copper cables (Cat5e/6).
Main Types and Transmission Distances
SX: 850nm multimode fiber, up to 550 meters.
LX/LH: 1310nm single-mode fiber, up to 10 kilometers.
EX/ZX: Long-haul single-mode fiber, up to 40–80 kilometers.
T: RJ45 electrical port, copper cable up to 100 meters.
Core value: Flexible interface configuration, convenient maintenance, and controllable costs, suitable for Gigabit scenarios in enterprise networks and data centers.

  • Speed: up to 10 Gbps

  • Most widely used in modern networks

Definition: Enhanced Small Form-factor Pluggable (Enhanced SFP), a 10Gbps high-speed optical/electrical transceiver module, and a mainstream 10 Gigabit network standard.
Form Factor & Compatibility: Same size as SFP, hot-swappable; SFP+ ports are backward compatible with SFP (1G), but not vice versa.
Core Parameters: Speed 10Gbps; wavelengths 850/1310/1550nm; interfaces LC (optical)/RJ45 (electrical); power consumption approx. 1–1.5W; supports DDM digital diagnostics.
Main Types: SR (multi-mode, 300m), LR (single-mode, 10km), ER (single-mode, 40km), ZR (single-mode, 80km), copper DAC/AOC.
Applications: Data centers, enterprise core/convergence layers, server uplinks, 10 Gigabit Ethernet/Fibre Channel.

  • Speed: up to 25 Gbps

  • Designed for high-performance data centers

Definition: An upgraded version of SFP+, a 25Gbps single-channel hot-pluggable optical module. The "28" refers to the 28Gbps electrical interface, and it is compatible with SFP+ slots.
Core Parameters:
Rate: 25Gbps (25.78Gbps), supporting 25G Ethernet, eCPRI, FC, etc.
Package: 14mm compact size, hot-pluggable, dual LC interface.
Transmission: Multi-mode (850nm) up to 100m; single-mode (1310nm) 10km, (1550nm) 40–80km; copper cable DAC ≤5m.
Low power consumption, equipped with DDM digital diagnostics, compatible with mainstream devices.
Advantages: Lower cost, power consumption and higher density than 40G/100G, and can be combined as 4×25G to form 100G.
Applications: Data centers, 5G fronthaul, HPC, enterprise core networks, 8K video transmission.

4. BiDi SFP (Bidirectional)

👉 Uses single fiber for both TX/RX

Core Definition: BiDi small form-factor pluggable optical module that achieves full-duplex communication over a single optical fiber based on WDM (Wavelength Division Multiplexing) technology.
Key Principle: Built-in WDM coupler, with transmitting and receiving signals using different wavelengths (commonly 1310nm/1550nm, 1310nm/1490nm); must be used in paired matching (Module A transmits at 1310nm and receives at 1550nm, while Module B operates in reverse).
Structural Features: Only one simplex LC fiber port, saving 50% of fiber resources compared to dual-fiber SFP modules.
Core Advantages: Reduces cabling and expansion costs, conserves fiber cores, and is suitable for scenarios with limited fiber resources.
Typical Applications: 5G fronthaul, FTTH, metropolitan area networks, data center interconnection, and industrial fiber-optic networks.

  • Saves fiber resources

  • Ideal for limited fiber infrastructure

5. CWDM / DWDM SFP

👉 Wavelength multiplexing modules

CWDM SFP (Coarse Wavelength Division Multiplexing)
    - Wavelength spacing 20nm, ranging from 1270–1610nm, supporting up to 18 wavelengths
    - Uses uncooled lasers, featuring low cost and simple deployment
    - Application: Metropolitan area networks, enterprise backbones, short‑to‑medium distance transmission (≤120km)
DWDM SFP (Dense Wavelength Division Multiplexing)
    - Wavelength spacing 0.4/0.8nm (50/100GHz), mainly operating in the C‑band, supporting 40–160 wavelengths
    - Requires temperature control and wavelength stabilization, offering large capacity and excellent long‑distance performance
    - Application: Backbone networks, DCI, ultra‑long‑haul transmission
Common Features
    - Hot‑pluggable SFP, LC interface, single‑mode fiber, used for wavelength division multiplexing capacity expansion

  • Long-distance transmission

  • Telecom and backbone networks

6. Copper SFP (RJ45 SFP)

👉 Uses Ethernet cable instead of fiber

Definition: SFP electrical port module that converts the SFP optical port of a device to an RJ45 electrical port without photoelectric conversion.
Interface and Medium: RJ45 interface, used with Cat5e/6 or higher twisted-pair cables.
Speed and Distance: Up to 100m for Gigabit Ethernet; generally 30m for 10 Gigabit SFP+.
Features: Hot-swappable, low power consumption, compliant with MSA standards.
Advantages: Reuses copper cabling, low cost, flexible deployment.
Application Scenarios: Conversion of switch optical ports to electrical ports, short-distance device interconnection, and computer room jumper connections.

  • Distance: up to 100m

  • Easy deployment

7. AOC (Active Optical Cable)

👉 Integrated cable + module

Definition: Active Optical Cable, a high-speed transmission line integrating optical modules, multimode fibers and active chips, with optoelectronic conversion devices integrated at both ends for plug-and-play use.
Core Structure**: Equipped with VCSEL lasers, PD detectors and signal processing chips at both ends; the middle section consists of multimode fibers (OM3/OM4).
Key Advantages
High Speed: Supports 10G–800G, with a single channel reaching up to 106.25Gbps.
Long Distance: Multimode transmission up to 100 meters, far exceeding DAC copper cables (≤7 meters).
Anti-interference: Optical fiber transmission with no EMI/RFI interference.
Lightweight: Approximately half the volume and a quarter the weight of copper cables, making cabling easier.
Main Applications: Data centers, AI computing power, HPC, storage networks, and high-definition audio and video transmission.
Comparison: Longer distance, higher speed and lighter weight than DAC copper cables; more reliable and simpler to deploy than "optical modules + patch cords".

  • Plug-and-play

  • Used for short-distance high-speed

8. DAC (Direct Attach Cable)

👉 Copper cable with built-in SFP ends

Full Name: Direct Attach Cable.
Structure: Pre-installed high-speed interface modules such as SFP+/QSFP28 at both ends, with copper cable in the middle; the finished product is integrated and non-detachable.
Types:
Passive DAC: No signal amplification circuit, 0.5–7 meters, low power consumption, low cost.
Active DAC: Built-in signal equalization/amplification, 5–15 meters, longer transmission distance.
Advantages: Plug-and-play, low latency, low cost, nearly zero power consumption for passive types.
Limitations: Short transmission distance, weaker anti-interference performance than optical fiber, larger weight and wire diameter.
Applications: High-speed interconnection of servers, switches and storage within racks/short distances in data centers.

  • Low cost

  • Very low latency

SFP Module Types Comparison

Type Speed Distance Medium Use Case
SFP 1G Short/Long Fiber Basic networks
SFP+ 10G Medium Fiber/DAC Enterprise
SFP28 25G Medium Fiber Data center
BiDi 1G–10G Long Fiber Limited fiber
CWDM/DWDM 1G–10G Very long Fiber Telecom
Copper SFP 1G–10G ≤100m Copper Office
AOC 10G+ Short Fiber Rack connections
DAC 10G+ Short Copper Data center

SFP Module

How to Choose the Right SFP Module

Ask yourself:

  1. What speed do you need?

  2. What is the transmission distance?

  3. Fiber or copper?

  4. Compatibility requirements?

👉 Quick guide:

  • Short distance → DAC / Copper

  • Long distance → Fiber

  • High speed → SFP28

Why SFP Cage Matters

All SFP modules rely on SFP cages.

👉 A good cage ensures:

  • Signal integrity

  • EMI shielding

  • Thermal performance

Looking for SFP-Compatible Hardware Solutions?

At JIA XUN, we provide:

✔ SFP / SFP+ / SFP28 cages
✔ High-speed compatible designs
✔ OEM / ODM support

Get Free Samples

📩 Contact us for:

  • Technical specs

  • Samples

  • Custom solutions

FAQ

1. What is the most common SFP type?
SFP+ (10G).

2. Can I use SFP in SFP+ port?
Yes (lower speed).

3. Which SFP is best for data centers?
SFP28 or higher.

Final Thoughts

👉 SFP modules vary by speed, distance, and application
👉 Choosing the right type ensures optimal performance and cost efficiency

Release time: 2026-03-20

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