LR (Long Range) and ER (Extended Range) are terms used to describe different types of optical transceivers commonly used in fiber optic communication. The main differences between LR and ER transceivers are related to their respective reach or distance capabilities:

1. LR (Long Range):

• Reach: LR transceivers are designed for longer-distance transmissions. They typically support distances of up to 10 kilometers (km) over single-mode fiber (SMF). LR transceivers are commonly used in applications where a moderate reach is required, such as in metropolitan area networks (MANs) or campus environments.

• Wavelength: LR transceivers commonly use wavelengths around 1310 nanometers (nm) for the optical signal.

2. ER (Extended Range):

• Reach: ER transceivers, as the name suggests, offer extended reach compared to LR. They are designed for longer-distance transmissions and can support distances of up to 40 kilometers (km) over single-mode fiber (SMF). ER transceivers are often used in applications requiring connectivity over extended distances, such as long-haul connections in telecommunications networks.

• Wavelength: ER transceivers also commonly use wavelengths around 1550 nanometers (nm) for the optical signal.

In summary, the primary difference between LR and ER transceivers lies in their reach capabilities. LR transceivers are suitable for medium-distance connections, typically up to 10 km, while ER transceivers are designed for extended distances, reaching up to 40 km. The specific wavelength used by each type may vary, but both are commonly used in single-mode fiber optic communication systems. When selecting a transceiver for a particular application, it's essential to consider the required reach and other specifications to ensure compatibility with the network's requirements.

The difference of SFP 10G SR LR LRM ER and ZR

Refer to the following table to compare clearly:

Sopto is a top sfp modules manufacturer in the optical communication industry and can provide the above five modules, meanwhile sopto’s modules can compatible with Cisco, HUIWEI and other brands. You can always choose your suitable modules according to your actual transmission distance demand at sopto.