Optical transceivers: Flexible fiber optic connections for professional networks
Optical transceivers are essential components for modern corporate networks—they enable data transmission via fiber optics at high speeds and over long distances. Whether single-mode transceivers for long distances or multimode transceivers for shorter distances: the right choice ensures scalability, efficiency, and investment security in your IT infrastructure.
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1-port 10GBase-ER/EW XFP. LAN/WAN functionality based on port configuration/capability. Supports single-mode fiber for interconnects up to 40km.
1-port 100BASE-FX Small Form-Factor Pluggable (SFP) Optics Module, Single Mode Fiber (SMF), 40 km, 1310 nm, LC Connector, Digital Diagnostic Monitor (DDM), Extended Temperature -40/85C.
Allied Telesis AT SPBD20-13/I - SFP (mini-GBIC) transceiver module - GigE - 1000Base-BiDi - up to 20 km - 1310 (RX) / 1550 (TX) nm, compatible
1000Base-BX SFP transceiver with an LC type of interface. This bi-directional transceiver is designed for use over single mode fiber optic on a single strand link up to 40 km. Transmits 1310 nm and receives 1490 nm optical signal.
XENPAK 10GE Pluggable Optic Module, 10GBASE-ER, 40 Km reach Juniper, compatible
TAA, 1000BX/LC SFP (2km over MMF, 1310nm), Ext. Temp -40 to 105c, compatible
SFP form factor, LX 1Gb optical transceiver, 10Km reach, SMF, duplex LC, IEEE 802.3ab 1000BASE-LX compliant
10 Gb, 10GBASE-LX4, IEEE 802.3 MM/SM, 1310 nm Long Wave Length, 300/240 M / 10 Km, SC Xenpak
CIENA - SFP (mini-GBIC) transceiver module - 1GbE - 1000Base-SX - LC multi-mode - 850 nm, compatible
Extended Temperature 10GE short reach multi-mode pluggable interface Juniper
LANCOM SFP-SX-LC10 10GBASE-SR/SW SFP module for connecting SFP+ ports on LANCOM switches, supports 50/125m and 125m multimode fiber optics (maximum distance 300 m)
What is an optical transceiver?
An optical transceiver converts electrical signals into light signals and transmits them via fiber optic cables. The transceiver modules are interchangeable and are typically used in network components such as switches, routers, or firewalls.
Differences exist depending on:
- Transmission rate (e.g., 1G, 10G, 25G, 100G, 400G)
- Form factor (SFP, SFP+, QSFP, QSFP28, QSFP-DD, etc.)
- Range (multimode up to approx. 550 m, singlemode up to 40 km+)
Form factors at a glance: SFP, QSFP & Co.
Different designs are used depending on network requirements:
SFP & SFP+
- SFP (1G SFP): Standard for Gigabit connections
- SFP+ (10G SFP): For 10 Gigabit Ethernet – compact, energy-efficient, and widely used
- SFP28 (25G SFP28): For modern data centers and backbone connections
- SFP56: Supports 50 Gbit/s – for high-throughput applications
- SFP-DD: Double density for two signals in the smallest of spaces
QSFP formats for higher bandwidths
- QSFP (40G QSFP): 4x10G – established in core and aggregation layers
- QSFP28 (100G QSFP28): Standard module for 100G backbone connections
- QSFP-DD (200G/400G QSFP-DD): Eight-channel high-performance transceivers – for hyperscale networks
- QSFP56: Supports 200 Gbit/s via 4x50G – future-proof solution for data centers
Singlemode vs. Multimode Transceivers: When to use which?
Single-mode transceivers
- Ideal for long distances (up to 40–80 km)
- Low attenuation and long range
- Use in wide area networks or between buildings
Multimode transceiver
- Cost-effective for shorter distances (up to approx. 500 m)
- Lower installation costs thanks to inexpensive OM3/OM4 fibers
- Frequently used in server rooms and building networks
Tip: When selecting a transceiver, make sure it is compatible with your switch or router. Most manufacturers provide compatibility lists or recommendations.
Frequently asked questions about optical transceivers
What is the difference between SFP and SFP+?
Both formats are identical in design, but differ in speed: SFP supports 1 Gbit/s, SFP+ up to 10 Gbit/s.
Are optical transceivers compatible across manufacturers?
Many devices only accept transceivers with the correct code. it-market therefore offers compatible alternatives to OEM modules that are fully functional and tested – e.g., 100G QSFP28 for Cisco, HPE, or Dell.
What does “hot-swappable” mean?
Transceivers can be replaced during operation – without restarting the system. This minimizes downtime during maintenance or expansion.
Optical transceivers: new, used, and refurbished at it-market
At it-market, you will find a wide selection of optical transceivers – in all form factors and speeds. Whether 1G SFP, 10G SFP+, 25G SFP28, 100G QSFP28, or 400G QSFP-DD: we carry tested new and used goods as well as refurbished modules.
Benefit from:
- 3-year warranty for companies
- Up to €2,500 buyer protection
- Short delivery times
Do you have any questions? Our sales team will be happy to answer any questions you may have about IT hardware and IT remarketing.