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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CIENA - SFP (mini-GBIC) transceiver module - 1GbE - 1000Base-BiDi - LC single-mode - up to 10 km - 1310 (TX) / 1550 (RX) nm - for ActivEdge 3920 Service Delivery Switch
10 Gb, 10GBASE-SR, IEEE 802.3 MM, 850 nm, 33/82/300/550 m, LC SFP, compatible
LANCOM SFP-SR-LC25 25GBASE-SR/SW SFP module for connecting SFP28 ports on LANCOM switches, supports 50 and 125m multimode fiber optics (maximum distance 300 m), compatible
TAA Compliant SFP28 form factor, SR 10Gb optical transceiver, short reach 100m, MMF, duplex LC, IEEE 802.3ae 25GBASE-SR compliant
1000Base-LH Industrial Gigabit Ethernet optical transceiver (SFP MSA). Supports single mode fiber over 1310 nm wavelength (nominal) with an LC connector. Typical reach of 40 Km on 9/125 m SMF.
1000BASE-BX-U BiDi SFP 1000BASE-BX-U SFP, 1310-nm TX/1490-nm RX wavelength, compatible
Single fiber 10/100TX (RJ-45) to 100FX (SC) 2-Port 1310nmTX/1310nmRX unmanaged media converter (15KM)
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.