SFP Module Buying Guide 2026: How to Choose the Right Fiber Optic Transceiver
SFP (Small Form-factor Pluggable) modules are essential components in fiber optic networks, converting electrical signals to optical signals for data transmission over fiber cables. Choosing the right SFP module is critical for network performance, compatibility, and reliability. This guide covers everything you need to know.
Types of SFP Modules
| Type | Speed | Distance | Fiber Type | Connector | Common Use |
|---|---|---|---|---|---|
| SFP | 1 Gbps | 550m-120km | MM or SM | LC / SC | Standard 1G fiber links |
| SFP+ | 10 Gbps | 300m-80km | MM or SM | LC | 10G data center, uplinks |
| QSFP+ | 40 Gbps | 100m-10km | MM or SM | MPO/LC | 40G aggregation |
| GPON SFP | 2.5G/1.25G | 20km+ | SM | SC/APC | OLT PON ports |
| EPON SFP | 1.25G symmetric | 20km | SM | SC/PC | EPON OLT ports |
Key Factors to Consider
1. Speed and Compatibility
Ensure the SFP module matches the speed of your network device port. Most SFP ports support 1 Gbps but check whether your switch or OLT supports specific SFP types (SFP, SFP+, QSFP+).
2. Distance and Fiber Type
- Multimode (MM) — Up to 550m, used in data centers and short-range connections
- Single-mode (SM) — Up to 120km, used for long-haul and FTTH networks
3. Wavelength
- 850nm — Multimode, short range
- 1310nm — Single-mode, standard range
- 1550nm — Single-mode, long range
- BiDi (1270nm/1330nm) — Single fiber bidirectional
4. OLT SFP Modules (PON)
For FTTH deployments using OLTs, special PON SFP modules are required. These operate at different optical power levels (Class B+, C, C++) and wavelengths than standard Ethernet SFPs.
- Class B+ — Standard, up to 20km
- Class C+ — Higher power, up to 20km with higher split ratios
- Class C++ — Highest power, for challenging deployments
SFP Modules Available at Langzhi Technology
| Product | Type | Price | Stock | Best For |
|---|---|---|---|---|
| Hisense LTE3680P-BC+ SFP | GPON/EPON OLT Class C+ | $54.00 | 10,000 | OLT deployments |
| EPON OLT SFP PX20+ | EPON OLT Module | $78.58 | 10,000 | EPON OLT |
| ZTE GPON OLT Class C++ | GPON OLT Module | $90.00 | 100 | High-power deployments |
Compatibility Guide
Our SFP modules are tested and compatible with:
- GPON OLTs: Huawei, ZTE, Fiberhome
- EPON OLTs: Langzhi Mini OLT, Huawei, ZTE
- Switches: Cisco, TP-Link, Ubiquiti, and standard SFP switches
Common Questions
Can I use a standard SFP in an OLT?
No. OLTs require PON-specific SFP modules that support OMCI management, DBA, and the correct optical power levels for PON networks.
What is the difference between BiDi and regular SFP?
BiDi (Bidirectional) SFPs use a single fiber strand for both transmit and receive, using different wavelengths. Regular SFPs use two fibers (one TX, one RX).
Do I need SFP modules for my ONT?
No. ONT/ONU devices have fixed optical interfaces (SC/APC or SC/PC). SFP modules are used on the OLT or switch side.
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