40G / 56G Fiber Optic Transceivers — QSFP+ Modules

MSA-compliant 40G QSFP+ transceivers: SR4 (100 m on OM3), LR4 (10 km), ER4 (40 km), BIDI variants. For data center aggregation and HPC. Compatible with Cisco, Juniper, Arista.

Last updated August 2026

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The 40G and 56G category is dominated by the QSFP+ (Quad Small Form-factor Pluggable) form factor, which carries four 10G lanes in parallel to achieve 40 Gbps aggregate throughput. QSFP+ is also used for 56G Infiniband FDR (4×14G), making it the standard for both 40GbE Ethernet and high-performance computing (HPC) interconnects.

What is QSFP+?

QSFP+ is a compact form factor that houses four 10G electrical channels, delivering 40 Gbps total bandwidth. It serves both 40GbE Ethernet and 56G Infiniband FDR applications.

What are the QSFP+ reach options?

SR4 (short-reach 4-fiber): up to 100 m on OM3, 150 m on OM4. LR4 (long-reach 4-wavelength CWDM): 10 km on single-mode. ER4: 40 km. BIDI: 20 km on a single fiber pair. PSM4: 500 m to 2 km on SMF using 4 parallel single-mode fibers.

Are 40G QSFP+ transceivers compatible with Cisco, Juniper, and Arista?

Yes. All Coretek Opto QSFP+ modules are MSA-compliant and compatible with Cisco Nexus 9000/7000, Juniper EX9200/QFX10000, Arista 7500E, Dell S-series, and Mellanox/NVIDIA SN series switches.

Where does 40G fit in a network architecture?

40G remains the aggregation and spine standard in mid-scale data centers and enterprise cores. QSFP+ is widely used for 40GbE aggregation and WAN edge uplinks. QSFP+ to 4×SFP+ breakout cables allow a single 40G port to connect to four separate 10G servers, making it a cost-effective top-of-rack strategy. Industrial-rated variants are available for utilities, defense, and outdoor telecom enclosures.

Where are these QSFP+ transceivers made, and how do I order in North America?

All QSFP+ modules are made in Taiwan by Coretek Opto, founded in 2001. NAFO, Coretek’s exclusive North American representative, handles orders for Canada and the United States from Richmond, BC. There is no online checkout; submit a quote request and we respond within 1 business day.

40G / 56G Transceivers — Full Specifications & Part Selection

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28 of 28 products
Form FactorData RateDescriptionOpticsDistanceConnectorTemp
QSFP+40 Gb/s40G OTU3 QSFP+850nm / MMF100 mMPOC&IGet Quote →
QSFP+40 Gb/s40G OTU3 QSFP+CWDM4 / SMF10 kmLCC&IGet Quote →
QSFP+40 Gb/s40G OTU3 QSFP+CWDM4 / SMF20 kmLCC&IGet Quote →
QSFP+40 Gb/s40G OTU3 QSFP+CWDM4 / SMF40 kmLCC&IGet Quote →
QSFP+40 Gb/s40G OTU3 QSFP+CWDM4 / SMF80 kmLCCGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+850nm / MMF150 mMPOC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+850nm / MMF400 mMPOC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+1310nm / SMF2 kmMPOC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+1310nm / SMF10 kmMPOC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+CWDM4 / SMF10 kmLCC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+CWDM4 / SMF20 kmLCC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+CWDM4 / SMF40 kmLCC&IGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+LWDM / SMF80 kmLCCGet Quote →
QSFP+40G QSFP+850/900 / MMF100 mLCCGet Quote →
QSFP+4×10.3125 Gb/s40G QSFP+850 880 910 940 / MMF350 mLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP281310nm / SMF10 kmLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP281310nm / SMF40 kmLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP281310nm / SMF80 kmLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP28TX1271/RX1331 / SMF10 kmLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP28TX1331/RX1271 / SMF10 kmLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP28TX1295/RX1309 / SMF40 kmLCCGet Quote →
QSFP2853.125 Gb/s50G QSFP28TX1309/RX1295 / SMF40 kmLCCGet Quote →
SFP5653.125 Gb/s50G SFP56850nm / MMF100 mLCCGet Quote →
SFP5653.125 Gb/s50G SFP561310nm / SMF2 kmLCC&IGet Quote →
SFP5653.125 Gb/s50G SFP561310nm / SMF10 kmLCC&IGet Quote →
SFP5653.125 Gb/s50G SFP561310nm / SMF20 kmLCCGet Quote →
SFP5653.125 Gb/s50G SFP561310nm / SMF40 kmLCCGet Quote →
QSFP+4×14.0625 Gb/s56G QSFP+850nm / MMF150 mMPOC&IGet Quote →

C = Commercial (0°C to 70°C) · I = Industrial (−40°C to 85°C)

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Manufactured by
Coretek Opto
Made in Taiwan · Since 2001
MSA-compliant · RoHS certified