1. By Transmission Rate:
Low-speed Optical Modules: 100M, 155M, 622M, 1.25G optical modules
Medium-speed Optical Modules: 10G, 25G, 40G optical modules
High-speed Optical Modules: 100G, 200G, 400G, 800G, 1.6T optical modules
2. By Package & Form Factor:
SFP (Small Form-factor Pluggable)
SFP+ (Enhanced SFP)
SFP28 (25G SFP)
QSFP (Quad Small Form-factor Pluggable)
QSFP+ (40G QSFP)
QSFP28 (100G QSFP)
QSFP-DD (Quad Small Form-factor Pluggable Double Density)
CFP / CFP2 / CFP4 / CFP8
XFP (10G Small Form-factor Pluggable)
X2
GBIC (Gigabit Interface Converter)
3. By Transmission Distance:
Short-reach (SR)
Typically within 100–300 m
Intermediate-reach (IR)
Around 500 m to 2 km
Long-reach (LR)
10 km, 20 km, 40 km
Extended long-reach (ER / ZR)
80 km, 100 km, 120 km and above
4. By Wavelength & Transmission Mode:
Single-mode Optical Modules (SM)
Operating wavelength: 1310 nm, 1550 nm
Multi-mode Optical Modules (MM)
Operating wavelength: 850 nm
CWDM Optical Modules (Coarse Wavelength Division Multiplexing)
DWDM Optical Modules (Dense Wavelength Division Multiplexing)
BiDi Optical Modules (Bidirectional, single-fiber)
PON Optical Modules (GPON, EPON, XGS-PON, 10G PON)
5. By Application Scenario:
Data Center Optical Modules
Telecommunication Optical Modules
CATV / Broadcast Optical Modules
Industrial Optical Modules
Automotive Optical Modules
6. By Optical Interface:
LC Interface
SC Interface
ST Interface
MPO/MTP Interface (for multi-channel parallel optics)