QSFP Optical Transceivers

400G & 800G High-Speed Optical Transceivers | DR4, SR4, DR8, SR8 | Single Mode & Multimode

Professional-grade QSFP (Quad Small Form Factor Pluggable) optical transceivers for next-generation data centers. Supporting 400 Gigabit and 800 Gigabit Ethernet with IEEE 802.3 compliance, CMIS digital diagnostics, and hot-pluggable design. Available in Single Mode (DR4/DR8) for long-reach applications and Multimode (SR4/SR8) for short-reach deployments.

Next-Generation QSFP Optical Transceivers

QSFP (Quad Small Form Factor Pluggable) is the industry-standard form factor for high-speed optical transceiver technology, designed for 400 Gigabit and 800 Gigabit Ethernet applications. QSFP provides excellent thermal management and power delivery for next-generation data center deployments.

Our QSFP transceiver portfolio includes both DR (Data Rate) variants for single-mode fiber long-reach applications and SR (Short Reach) variants for multimode fiber short-reach deployments. All modules feature MPO-12 APC connectors, hot-pluggable operation, comprehensive digital diagnostics via CMIS interface, and full IEEE 802.3 compliance.

Every QSFP transceiver undergoes rigorous factory testing including optical power measurements, bit error rate testing, temperature cycling, and compliance verification. We supply only premium-grade modules with full manufacturer warranty, comprehensive documentation, and technical support for integration and deployment.

400G & 800G Support

Hot-Pluggable QSFP

IEEE 802.3 Compliant

CMIS Digital Diagnostics

Why Choose Our QSFP Transceivers

400G & 800G Performance

Support for both 400 Gigabit and 800 Gigabit Ethernet with PAM4 modulation. Future-proof your infrastructure with the latest high-speed technology.

Full Standards Compliance

IEEE 802.3cu/ck/df compliant, QSFP MSA specification adherent, CMIS 4.0/5.0 support. Ensures interoperability with all major switch vendors.

Superior Thermal Design

QSFP form factor provides excellent thermal management with 0°C to 70°C case temperature range. Extended body design for efficient heat dissipation.

Comprehensive Digital Diagnostics

CMIS interface provides real-time monitoring of optical power, temperature, voltage, bias current, and more. Essential for proactive network management.

Hot-Pluggable Operation

Install or replace transceivers without powering down equipment. Minimizes downtime and simplifies maintenance in production environments.

Laser Safety & RoHS Compliant

Class 1 laser safety certification, RoHS 2.0 compliant for environmental responsibility. Meets all international safety and regulatory requirements.

QSFP Product Selection Guide

Choose the right QSFP transceiver based on your data rate, fiber type, and distance requirements.

Feature	400G DR4	400G SR4	800G DR8 ⭐	800G SR8 ⭐
Data Rate	400 Gbps	425 Gbps	800 Gbps	850 Gbps
Fiber Type	Single-Mode (OS2)	Multimode (OM3/OM4)	Single-Mode (OS2)	Multimode (OM3/OM4)
Max Distance	500 meters	30m (OM3) / 50m (OM4)	500 meters	30m (OM3) / 50m (OM4)
Wavelength	1310nm	850nm VCSEL	1310nm	850nm VCSEL
Connector	MPO-12 APC	Dual MPO-12 APC	MPO-12 APC	Dual MPO-12 APC
Power	< 9W	< 9W	< 16W	< 14W
IEEE Standard	802.3cu 400GBASE-DR4	802.3ck 400GBASE-SR4	802.3df 800GBASE-DR8	800GBASE-SR8 / 2×400G
Best For	Data center interconnect	Intra-rack, short-reach	HPC, high-density DC	2×400G or 8×100G

Quick Selection Guide:

Need long reach (500m)? → Choose DR4 (400G) or DR8 (800G)

Short-reach intra-rack? → Choose SR4 (400G) or SR8 (800G)

Maximum density/speed? → Choose 800G models (DR8 or SR8)

Not sure? → Call us: +1 (945) 366-3837

QSFP Transceiver Product Line

Professional optical transceivers for 400G and 800G Ethernet deployments. All models hot-pluggable, CMIS compliant, and fully tested.

400G DR4

QSFP 400G DR4 — Single Mode Transceiver

400 Gbps | Single-Mode OS2 | MPO-12 APC | 500m Reach

Best For: Data center interconnect, building-to-building links, campus backbone, 400G long-reach applications

Data Rate: 400 Gbps (4×106.25 Gbps)

Distance: Up to 500 meters on OS2 SMF

Wavelength: 1310nm (4 channels)

Connector: MPO-12 APC receptacle

Power: < 9W typical consumption

Standard: IEEE 802.3cu 400GBASE-DR4

Key Features:

✓QSFP MSA Rev 5.0 compliant housing (107.8mm extended body)
✓400GAUI-4/200GAUI-2/100GAUI-1 C2M electrical interface
✓CMIS Rev 5.0 digital diagnostic monitoring
✓Operating case temperature: 0°C to 70°C
✓Class 1 laser safety certification
✓RoHS 2.0 compliant (EU Directive 2011/65/EU)
✓Two-wire I2C interface with DDM

Applications:

✓400G data center interconnect (DCI)
✓Campus network backbone links
✓Building-to-building connectivity
✓Metropolitan area network (MAN) connections
✓Enterprise core networking

Technical Specifications — 400G DR4

Parameter	Specification	Notes
Form Factor	QSFP (Extended RHS Housing)	107.8mm body length
Data Rate	400 Gbps aggregate	4 lanes × 106.25 Gbps
Fiber Type	Single-Mode OS2 (9/125μm)	ITU-T G.652 compliant
Max Link Length	500 meters	On OS2 single-mode fiber
Optical Connector	MPO-12 APC receptacle	Female, angled polished
Wavelength	1310nm nominal	4 CWDM channels
Power Supply	3.3V (3.135V – 3.465V)	Single rail
Power Consumption	< 9W typical	Maximum rated
Case Temperature	0°C to 70°C	Commercial grade
Management	CMIS 5.0 via I2C	Digital diagnostics included

400G SR4

QSFP 400G SR4 — Multimode Transceiver

425 Gbps | Multimode OM3/OM4 | Dual MPO-12 APC | 30m/50m Reach

Best For: Intra-rack connections, short-reach data center, 1×400GbE, 2×200GbE, 4×100GbE applications

Data Rate: Up to 425 Gbps (8×53.125 Gbps PAM4)

Distance: 30m (OM3) / 50m (OM4)

Wavelength: 850nm VCSEL (4 channels)

Connector: Dual MPO-12 APC receptacle

Power: < 9W power dissipation

Standard: IEEE 802.3ck 400GBASE-SR4

Key Features:

✓8×53.125 GBd PAM4 electrical interface
✓VCSEL transmitter array (850nm wavelength)
✓PIN photodiode + TIA array receiver
✓Dual MPO-12 APC connectors (channels 5–8 unused)
✓PAM4 re-timer ASIC with 4-channel modulator driver
✓I2C interface with integrated digital diagnostics
✓CMIS 4.0 compliant management interface
✓Safety certifications: TUV/UL/FDA

Applications:

✓1×400 Gigabit Ethernet (400GbE)
✓2×200 Gigabit Ethernet (200GbE)
✓4×100 Gigabit Ethernet (100GbE)
✓Intra-rack server connectivity
✓Top-of-rack to spine switch connections
✓Short-reach data center applications

Technical Specifications — 400G SR4

Parameter	Specification	Notes
Form Factor	QSFP (Riding Heat Sink)	MSA compliant
Data Rate	Up to 425 Gbps	8 lanes × 53.125 Gbps PAM4
Fiber Type	OM3 (50/125μm) or OM4 (50/125μm)	Laser-optimized multimode
Max Link Length	30m (OM3) / 50m (OM4)	100G PAM-4 per lane
Optical Connector	Dual MPO-12 APC receptacle	Channels 5–8 unused
Wavelength	850nm VCSEL array	4 independent channels
Power Supply	Single 3.3V rail	Typical operating voltage
Power Consumption	< 9W	Maximum power dissipation
Case Temperature	0°C to 70°C	Commercial temperature range
Management	CMIS 4.0 via I2C	Digital diagnostic monitoring

⭐ RECOMMENDED

800G DR8

QSFP 800G DR8 — Silicon Photonics Transceiver ⭐

800 Gbps | Single-Mode OS2 | Silicon Photonics | MPO-12 APC | 500m Reach

Best For: High-density data centers, hyperscale deployments, HPC networks, enterprise core, service provider transport

Data Rate: 800 Gbps (8×106.25 Gbps)

Distance: Up to 500 meters on OS2 SMF

Technology: Silicon Photonics PIC

Connector: MPO-12 APC receptacle

Power: < 16W maximum consumption

Standard: IEEE 802.3df 800GBASE-DR8

Key Features:

✓Silicon Photonics integrated circuits (PIC) technology
✓8 independent transmit and receive channels at 106.25 Gb/s
✓IEEE 802.3df/ck standards compliant
✓QSFP MSA form factor compliance
✓CMIS 5.1 management interface
✓Class 1 laser safety certification
✓RoHS 2.0 environmental compliance
✓Operating case temperature: 0°C to 70°C

Applications:

✓Hyperscale data center rack-to-rack connectivity
✓High-performance computing (HPC) networks
✓Enterprise core and distribution layers
✓Service provider transport applications
✓AI/ML infrastructure high-speed interconnects

⭐ Why 800G DR8 is Recommended:

Maximum bandwidth density (800 Gbps)
Silicon Photonics for superior performance
500m reach for flexible data center layout
Future-proof investment for next-gen networks

Technical Specifications — 800G DR8

Parameter	Specification	Notes
Form Factor	QSFP MSA Compliant	Extended body design
Data Rate	800 Gbps aggregate	8 lanes × 106.25 Gbps
Technology	Silicon Photonics (PIC)	Integrated transmit & receive
Fiber Type	Single-Mode OS2 (9/125μm)	Parallel SMF fiber
Max Link Length	500 meters	On OS2 single-mode fiber
Optical Connector	MPO-12 APC receptacle	8 lanes utilized
Wavelength	1310nm band	8 wavelength channels
Power Consumption	< 16W maximum	Typical operating power
Case Temperature	0°C to 70°C	Commercial temperature range
Management	CMIS 5.1	Comprehensive digital diagnostics

⭐ RECOMMENDED

800G SR8

QSFP 800G SR8 (2×400G VR4) — Multimode Transceiver ⭐

850 Gbps | Multimode OM3/OM4 | Dual MPO-12 APC | 30m/50m | 2×400GbE / 8×100GbE

Best For: Short-reach 800G, 2×400 Gigabit Ethernet, 8×100 Gigabit Ethernet, intra-rack high-density deployments

Data Rate: Up to 850 Gbps (8×106.25 Gbps PAM4)

Distance: 30m (OM3) / 50m (OM4)

Wavelength: 850nm VCSEL (8 channels)

Connector: Dual MPO-12 APC receptacle

Power: < 14W power dissipation

Configuration: 2×400GbE or 8×100GbE

Key Features:

✓Dual 400G transmitter/receiver units (2×400G VR4)
✓8×53.125 GBd PAM4 electrical interface
✓8 independent VCSEL transmitters at 850nm
✓8 PIN photodiodes with dual 4-channel TIA arrays
✓PAM4 re-timer ASIC with dual 4-channel modulator drivers
✓Dual MPO-12 APC connectors for complete 8-lane operation
✓I2C interface with integrated digital diagnostic monitoring
✓QSFP MSA and CMIS 5.0 compliant

Applications:

✓2×400 Gigabit Ethernet (dual 400GbE)
✓8×100 Gigabit Ethernet (8×100GbE)
✓Intra-rack server to switch connectivity
✓Top-of-rack to spine high-density links
✓Short-reach high-bandwidth applications
✓AI/ML cluster interconnects

⭐ Why 800G SR8 is Recommended:

Flexible 2×400G or 8×100G operation
Cost-effective short-reach solution
Maximum bandwidth for intra-rack deployments
VCSEL technology for proven reliability

Technical Specifications — 800G SR8

Parameter	Specification	Notes
Form Factor	QSFP MSA Compliant	Standard QSFP housing
Data Rate	Up to 850 Gbps	8 lanes × 106.25 Gbps PAM4
Fiber Type	OM3 (50/125μm) or OM4 (50/125μm)	Laser-optimized multimode
Max Link Length	30m (OM3) / 50m (OM4)	Short-reach applications
Optical Connector	Dual MPO-12 APC receptacle	All 8 lanes utilized
Wavelength	850nm VCSEL array	8 independent channels
Power Supply	Single 3.3V rail	Standard operating voltage
Power Consumption	< 14W	Maximum power dissipation
Case Temperature	0°C to 70°C	Commercial temperature range
Management	CMIS 5.0 via I2C	Digital diagnostic monitoring

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FREQUENTLY ASKED QUESTIONS

Have questions about QSFP optical transceivers? We've compiled answers to the most common questions from our customers.

What are the different QSFP form factors available?

QSFP (Quad Small Form Factor Pluggable) comes in several variants for different speed requirements. The main types are: QSFP+ (40G) — the original QSFP for 40 Gigabit Ethernet applications; QSFP28 (100G) — evolved for 100 Gigabit Ethernet using 4 lanes at 25 Gbps each; QSFP56 (200G) — supporting 200 Gigabit Ethernet with 4 lanes at 50 Gbps; and QSFP-DD (400G) — Double Density design with 8 electrical lanes for 400 Gigabit applications. All QSFP variants share the same basic footprint and are backward compatible with QSFP+ cage designs, though higher-speed variants may require better thermal management. Our 400G and 800G transceivers use the latest QSFP-DD technology for maximum bandwidth density while maintaining industry-standard form factor compatibility.

Should I choose DR (single-mode) or SR (multimode) transceivers?

Choose DR (Data Rate) single-mode transceivers when you need distances up to 500 meters, such as data center interconnect, building-to-building links, campus backbone networks, or metropolitan area connections. Single-mode provides longer reach but requires single-mode fiber. Choose SR (Short Reach) multimode transceivers for distances under 50 meters (OM4) or 30 meters (OM3), such as intra-rack connections, top-of-rack to spine switch links, or short-reach data center applications. Multimode uses less expensive OM3/OM4 fiber and lower-cost VCSEL transmitters. For most data center applications within a single building or rack row, SR models are more cost-effective. For inter-building or longer campus connections, DR models are necessary.

Are your QSFP transceivers compatible with major switch vendors?

Yes! Our QSFP transceivers are fully compliant with IEEE 802.3 standards, QSFP MSA specifications, and CMIS management interface standards, ensuring compatibility with switches from all major vendors including Cisco, Arista, Juniper, Dell, HPE, Mellanox/NVIDIA, and Broadcom. The transceivers use standardized electrical interfaces (400GAUI-4, 400GAUI-8, etc.) and optical specifications (400GBASE-DR4/SR4, 800GBASE-DR8/SR8) that are vendor-neutral. We provide detailed compatibility information and can verify specific switch model compatibility before purchase. Our transceivers have been tested and deployed in multi-vendor environments successfully.

What is CMIS and why is it important?

CMIS (Common Management Interface Specification) is the industry-standard management interface for high-speed optical modules including QSFP, QSFP-DD, and QSFP56. CMIS provides: comprehensive digital diagnostic monitoring including real-time optical power levels, temperature, voltage, and bias current for all channels; advanced module control including transmitter enable/disable, low power modes, and configuration management; standardized register map ensuring consistent management across different vendors and form factors; support for complex module features like forward error correction (FEC), loopback modes, and alarm/warning thresholds. CMIS replaces older SFF-8636 management interfaces with a more capable and feature-rich specification designed for 400G/800G applications. All our QSFP transceivers support CMIS 4.0 or 5.0 for comprehensive network monitoring and management.

What fiber optic cables do I need for QSFP transceivers?

QSFP transceivers use MPO-12 APC (angled polished connector) fiber optic cables. For DR models (400G DR4, 800G DR8): use single-mode OS2 (9/125μm) MPO-12 trunk cables with Type B polarity — these are the yellow-jacketed cables we offer in our MTP®/MPO trunk cable product line. For SR models (400G SR4, 800G SR8): use multimode OM3 (aqua) or OM4 (magenta) MPO-12 trunk cables with Type B polarity — OM4 is recommended for maximum distance (50m vs 30m). Both SR4 and SR8 models use dual MPO-12 connectors. The 400G SR4 uses channels 1–4 on one MPO connector (channels 5–8 unused), while 800G SR8 uses all channels on both MPO connectors. We can provide matching trunk cables and breakout cables to complete your connectivity solution — contact us for a complete cabling package.

What is Silicon Photonics technology in the 800G DR8?

Silicon Photonics is an advanced optical technology that integrates photonic components (lasers, modulators, photodetectors, waveguides) onto silicon chips using semiconductor manufacturing processes. For the 800G DR8 transceiver, Silicon Photonics PICs (Photonic Integrated Circuits) provide: high integration density allowing 8 transmit and 8 receive channels in a compact package, superior performance with consistent optical characteristics across all channels, efficient power management despite the high data rate (under 16W for 800 Gbps), lower manufacturing costs at volume compared to discrete optical components, and proven reliability from mature semiconductor fabrication processes. Silicon Photonics enables the 800G DR8 to achieve 500 meter reach on standard single-mode fiber with excellent optical performance — a critical advancement for next-generation data centers.

Can the 800G SR8 be used as 2×400G or 8×100G?

Yes! The 800G SR8 (also designated as 2×400G VR4) is a flexible transceiver that can operate in multiple configurations. It can function as: 2×400 Gigabit Ethernet (2×400GbE) — two independent 400G channels, ideal for switches with dual 400G ports; 8×100 Gigabit Ethernet (8×100GbE) — eight independent 100G channels when used with appropriate breakout cables and switch port configuration; or full 800 Gigabit operation as a single 800G interface. The module features 8 independent electrical lanes and dual MPO-12 APC connectors, providing maximum flexibility for different deployment scenarios. Configuration is typically managed through the host switch — consult your switch documentation for supported breakout modes and configuration procedures.

What warranty and support do you provide for QSFP transceivers?

All QSFP optical transceivers include comprehensive manufacturer warranty coverage. Standard warranty period is typically 3–5 years depending on the specific model. Warranty covers defects in materials and workmanship including: optical performance (power levels, wavelength accuracy), electrical interface compliance, CMIS management interface functionality, and mechanical integrity. Warranty does not cover damage from improper installation, operation outside specified environmental conditions, electrical overstress, or connector contamination. We provide technical support for installation, configuration, and troubleshooting. Each transceiver includes detailed specification sheets, compliance documentation, and test reports. Extended warranties and premium support packages are available for mission-critical applications.