Finisar is one of the most widely used names in 10 Gigabit Ethernet optics — its SFP+ modules ship as the genuine part inside switches from Cisco, Dell, HPE, and others, and are sold standalone for exactly that reason. “Finisar 10Gb/s SFP+” isn’t one product, though. It’s a family split mainly by fiber type and reach, and picking the right one comes down to two questions: multimode or single-mode fiber, and how far the link needs to go.
What Finisar 10Gb/s SFP+ Actually Covers
These modules are MSA-compliant hot-pluggable transceivers supporting bit rates from roughly 9.95 to 10.5 Gb/s, which covers 10 Gigabit Ethernet, 10G Fibre Channel, and OTN variants depending on the specific part. They carry Finisar’s patented digital diagnostics, giving real-time visibility into optical power, temperature, and link health through a standard two-wire interface.
The Core Models
FTLX8571D3BCL / FTLX8573D3BTL — 10GBASE-SR/SW, multimode. These use an 850nm laser over multimode fiber, reaching up to 300m on OM3 and roughly 400m on OM4, with a duplex LC connector. FTLX8573D3BTL is the industrial-temperature variant, rated -40°C to +85°C, for less climate-controlled installations. Also supports 10G Fibre Channel (1200-Mx-SN-I).
FTLX1471D3BCL / FTLX1475D3BCL — 10GBASE-LR/LW, single-mode. Built for long single-mode runs, using a 1310nm laser to reach up to 10km over standard SMF, also with a duplex LC connector. FTLX1475D3BCL additionally supports 10G Fibre Channel (1200-SM-LL-L).
FTLX8574D3BCL — multimode 10G SFP+. A further multimode option used in 10-Gigabit Ethernet links over multimode fiber, for the same short-reach, in-building use case as the SR family.
Dual-rate options (e.g., FTLX1471D3BCV). Some Finisar 10G parts support both 1G and 10G operation on the same module over single-mode fiber up to 10km — useful for simplifying sparing during a 1G-to-10G migration.
Quick Comparison
| Model | Standard | Fiber | Reach | Wavelength |
| FTLX8571D3BCL | 10GBASE-SR/SW | Multimode | 300m (OM3) / 400m (OM4) | 850nm |
| FTLX8573D3BTL | 10GBASE-SR/SW (industrial temp) | Multimode | 300m (OM3) / 400m (OM4) | 850nm |
| FTLX1471D3BCL | 10GBASE-LR/LW | Single-mode | 10 km | 1310nm |
| FTLX1475D3BCL | 10GBASE-LR/LW | Single-mode | 10 km | 1310nm |
Buying Considerations
Match fiber type first. Multimode and single-mode modules aren’t interchangeable, and this decision alone eliminates half the lineup immediately.
Check your actual link distance before assuming LR’s full 10km. If a short-reach SR module comfortably covers your run, it’s typically the lower-cost option.
Confirm the port is SFP+, not SFP. These are 10G modules and require a 10G-capable SFP+ cage — a 1G-only SFP port won’t support them.
Verify switch compatibility. Finisar 10G SFP+ modules are widely used as Cisco-compatible optics across Catalyst and Nexus platforms, as well as other major vendors, but this is still subject to the specific platform’s firmware and coding checks.
Consider industrial-temperature variants for uncontrolled environments. FTLX8573D3BTL’s wider operating range matters if the module won’t sit in a climate-controlled room.
Sourcing Genuine Finisar 10Gb/s SFP+ Modules
NextGen Networks supplies genuine Finisar optical transceivers and SFP+ modules for enterprise and data center networks across India, with 100% original inventory and fast delivery — covering the full range from FTLX8571D3BCL and FTLX8573D3BTL to FTLX1471D3BCL and FTLX1475D3BCL.
Conclusion
Finisar’s 10Gb/s SFP+ lineup is built around a simple split: SR-class modules for short multimode runs, LR-class modules for 10km single-mode links, with industrial-temperature and dual-rate variants covering more specific needs. Match fiber type and distance to your actual deployment, and the right part follows from there.
Frequently Asked Questions
What does Finisar 10Gb/s SFP+ actually mean? It refers to Finisar’s family of hot-pluggable SFP+ transceivers supporting roughly 9.95–10.5 Gb/s bit rates, covering 10 Gigabit Ethernet, 10G Fibre Channel, and related standards depending on the part.
What’s the difference between FTLX8571D3BCL and FTLX1471D3BCL? FTLX8571D3BCL is a multimode 10GBASE-SR/SW module reaching up to 400m. FTLX1471D3BCL is a single-mode 10GBASE-LR/LW module reaching up to 10km. They use different fiber types and aren’t interchangeable.
Are Finisar 10G SFP+ modules compatible with Cisco switches? Finisar 10G SFP+ transceivers are MSA-compliant and widely used as Cisco-compatible optics across Catalyst and Nexus platforms, subject to firmware compatibility checks on the specific switch.
What is FTLX8573D3BTL used for? It’s the industrial-temperature version of the 10GBASE-SR/SW multimode module, rated -40°C to +85°C, for installations without climate control.
Can a Finisar 10G SFP+ module work in a 1G SFP port? No. These are SFP+ modules built for 10G and require a 10G-capable SFP+ port, not a 1G-only SFP slot.
What connector do Finisar 10Gb/s SFP+ modules use? A duplex LC connector across the SR and LR families covered here.
Do any Finisar 10G SFP+ modules support both 1G and 10G? Yes — dual-rate parts such as FTLX1471D3BCV support both 1G and 10G Ethernet over single-mode fiber up to 10km on the same module.
What’s the maximum reach for a Finisar multimode 10G SFP+ module? Up to roughly 400 meters on OM4 fiber, or 300 meters on OM3, using the 850nm SR/SW modules.
