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.

More about optical transceivers

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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.