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Views: 128 Author: anna Publish Time: 2026-10-16 Origin: Site
When deploying 10G Ethernet, 10G LR and 10G BiDi are two common solutions for long-distance transmission; selecting the appropriate optical module is a critical decision in network design. This article compares these two types of modules to help you make the right choice based on your specific needs.
The 10G SFP+ LR optical module complies with the 10GBase-LR Ethernet standard, where "LR" stands for "Long Reach." It supports a maximum transmission distance of 10 km over single-mode fiber at a wavelength of 1310 nm (though in practice, it can reach up to 25 km) and offers the advantages of compact size, low power consumption, and long transmission range.
The 10G BiDi SFP+ optical module features an SFP+ form factor, a 10G transmission rate, and an LC simplex interface; it supports transmission distances of up to 100 km over single-mode fiber. "BiDi" stands for "Bidirectional" (specifically, single-fiber bidirectional transmission). It utilizes WDM (Wavelength Division Multiplexing) technology to transmit and receive signals at different center wavelengths, thereby enabling bidirectional optical signal transmission over a single fiber strand.
Comparison dimensions | 10G LR | 10G BiDi |
Fiber-optic occupancy | 2 optical fibers (one for transmission, one for reception) | 1 optical fiber (bidirectional transmission) |
Interface type | Dual LC | Simplex LC |
Wavelength configuration | 1 optical fiber (bidirectional transmission) | Wavelength pairing at both ends (e.g., 1270/1330 nm) |
Working method | Independent transmission via dual fibers | WDM single-fiber multiplexing |
Module unit price | Lower | Relatively high (due to the cost of WDM components) |
Deployment complexity | Simple, plug-and-play. | Requires strict matching; maintenance is relatively complex. |
Standards Compliance | IEEE 802.3ae 10GBASE-LR | IEEE 802.3ae 10GBASE-BX |
SFP-10G-LR optical modules feature a compact form factor, low power consumption, and long transmission distances. They are suitable for medium-to-long-range applications, such as university campuses, industrial parks, carrier networks, and large-scale data centers.
When using these modules with fiber optic cables, it is crucial to note that single-mode fiber cannot be used with multi-mode modules; the wide divergence angle of the optical signal from a multi-mode module combined with the small aperture of single-mode fiber results in insufficient light coupling for long-distance transmission. Conversely, using multi-mode fiber with a single-mode module is also not recommended; although the light couples effectively into the fiber, it propagates in multi-mode fashion, leading to significant dispersion and limiting transmission to short distances. Furthermore, the increased optical power at the receiver end can cause overload, making this configuration inadvisable.
Currently, BiDi (Bidirectional) single-fiber optical modules are commonly used in ISP networks, FTTx deployments, and data centers operating at 1/10 Gbps transmission rates. These modules can be installed in devices such as switches, fiber media converters, and OEO converters to ensure stable optical transmission.
Q: Can BiDi modules interoperate with standard LR modules?
A: No. BiDi modules utilize a single fiber and distinct wavelengths; they must be used in matched pairs with another BiDi module.
Q: Do BiDi modules support higher transmission rates?
A: Yes. 25G BiDi (SFP28) and 100G BiDi (QSFP28) products are currently available.
Q: How should I choose modules for industrial environments?
A: Industrial-grade versions (-40°C to 85°C) are available for both types of modules; selection should be based on the operating temperature of the environment.
