Juniper 40GBASE-LR4 QSFP+ Transceiver — 10km Single-Mode Fiber

The Juniper 740-073095 is a 40GBASE-LR4 QSFP+ optical transceiver delivering 40GbE over single-mode fiber up to 10km at 1310nm via duplex LC connector — Juniper-genuine for use in Juniper QFX, MX, and PTX platforms requiring 40G SMF connectivity for data center interconnect, campus backbone, and service provider aggregation links.

Key Features

• 40GBASE-LR4 QSFP+ for 10km 40GbE over single-mode fiber via 4-lane LAN-WDM
• Duplex LC connector compatible with standard SMF LC structured cabling infrastructure
• Juniper part number 740-073095 for platform-verified QSFP+ compatibility
• DDM/DOM support for real-time optical monitoring via Junos OS
• Low-power QSFP+ form factor for high-density 40G SMF deployments

Product Specifications

• Part Number: 740-073095
• Manufacturer: Juniper Networks
• Form Factor: QSFP+
• Speed: 40GbE (40GBASE-LR4)
• Wavelength: 1310nm (4-lane LAN-WDM)
• Connector: Duplex LC
• Fiber Type: Single-Mode Fiber (SMF, OS1/OS2)

Transceiver & Interface Specifications

• Max Distance: 10km over OS1/OS2 SMF
• Data Rate: 4 x 10Gbps LAN-WDM lanes
• TX Power: -6.5 to +2.5 dBm per lane
• RX Sensitivity: -10.5 dBm (min)
• Power Consumption: Typically 3.5W
• DDM/DOM: Yes
• Operating Temperature: 0°C to 70°C (commercial)

Use Cases

• 40GbE inter-switch SMF links in Juniper QFX spine-leaf deployments up to 10km
• Service provider 40G aggregation links over SMF on Juniper MX or PTX platforms
• Campus or enterprise inter-building 40GbE links using existing SMF infrastructure
• Data center interconnect (DCI) at 40GbE over 10km SMF dark fiber

Compatibility

• Compatible with Juniper QFX, MX, and PTX platforms with QSFP+ 40G port slots
• Requires OS1/OS2 single-mode fiber with duplex LC connectors
• IEEE 802.3ba 40GBASE-LR4 compliant
• Not compatible with QSFP28 100G ports — verify port type before ordering

Frequently Asked Questions

Can the 740-073095 be used for 4x10GbE breakout?

No — 40GBASE-LR4 uses 4-lane LAN-WDM on a single duplex LC fiber pair and cannot be broken out into 4x10GbE. For 4x10GbE breakout applications, use 40GBASE-SR4 QSFP+ with MPO-to-LC fan-out cables over MMF.

Is the 740-073095 compatible with third-party 40GBASE-LR4 QSFP+ ports?

The 740-073095 is Juniper-genuine and IEEE 802.3ba 40GBASE-LR4 compliant. As a standards-compliant optic, it will optically interoperate with other 40GBASE-LR4 QSFP+ ports, but Juniper platform coding may restrict use in non-Juniper equipment.

What is the difference between 40GBASE-LR4 and 40GBASE-SR4?

40GBASE-LR4 uses 4-lane LAN-WDM over single-mode fiber for 10km reach with duplex LC connectors, while 40GBASE-SR4 uses 4 parallel lanes over multi-mode fiber for 150m (OM3) or 400m (OM4 at reduced rate) with MPO connectors. LR4 suits inter-building and DCI applications; SR4 suits short-reach data center deployments.

The Juniper 740-073095 delivers reliable 40GBASE-LR4 connectivity over 10km single-mode fiber with DDM monitoring and Juniper platform certification — providing the standard 40G SMF QSFP+ optic for campus backbone, DCI, and service provider aggregation applications on Juniper QFX, MX, and PTX platforms.