Cisco Fiber Optic Module WSP-Q40GLR4L Extender Transceiver

Cisco Fiber Optic Module WSP-Q40GLR4L:

The Cisco fiber optic module WSP-Q40GLR4L is a QSFP+ fiber optic transceiver designed for 40-Gigabit Ethernet connections over single-mode fiber (SMF). Think of it as the “bridge” between your networking hardware (switches, routers) and your fiber cables. It converts the electrical signals inside the switch into light pulses that travel over fiber, and vice versa.

This Cisco module instead of sending one 40Gbps light signal, the module splits the data into four 10Gbps lanes. Each lane is sent on its own wavelength (using CWDM). Inside the module:

1. The electrical 40Gbps signal from the switch is split into four electrical 10Gbps lanes.
2. Each lane drives its own laser, tuned to a different wavelength (around 1270–1330 nm).
3. A multiplexer combines these four wavelengths into one signal over the single fiber pair.
4. On the receiving end, the process is reversed a demultiplexer splits the wavelengths, and each lane is converted back to electrical signals.

Introducing Cisco Fiber Optic Module WSP-Q40GLR4L:

The Cisco WSP-Q40GLR4L is a 40GBASE-LR4-Lite (IR4-Lite) QSFP+ transceiver designed for high-speed data transmission over single-mode fiber (SMF) at distances of up to 2 km using duplex LC connectors. It delivers a total data rate of 40Gbps by transmitting four separate lanes, each operating at approximately 10Gbps, over CWDM wavelengths in the 1270–1330 nm range, multiplexed within the module.

Operating around 1310 nm, it offers an optical link budget of about 4 dB, making it well-suited for data center interconnects and other medium-range applications. This network module supports Digital Diagnostics Monitoring (DDM/DOM) for real-time insight into parameters such as temperature, voltage, and optical power. With a typical power consumption of 3.5 W and a commercial temperature rating of 0–60 °C (or up to 70 °C depending on vendor), it combines efficiency, reliability, and performance for modern network environments. You can buy this product in network equipment market.

Benefits of Cisco Fiber Optic Module WSP-Q40GLR4L:

• Digital Diagnostics (DDM/DOM): lets you monitor optical power levels, temperature, and voltage in real time from your switch.
• Hot-swappable: no need to shut down equipment to install or replace.
• Cisco-compatible ID: works with Cisco switches/routers that require vendor authentication.
• Energy efficient: ~3.5 W power consumption.
• Reliable: designed for enterprise-grade uptime.

Uses of Cisco Fiber Optic Module WSP-Q40GLR4L:

• Connecting two Cisco switches in the same building (e.g., between server rooms).
• Linking racks in a data center with high-speed backbones.
• Campus backbone links that don’t exceed 2 km.
• Migration path for networks upgrading from 10G to 40G without changing fiber runs.

Features of Cisco Fiber Optic Module WSP-Q40GLR4L:

• Form factor: QSFP+ (Quad Small Form-factor Pluggable Plus)
• Standard: 40GBASE-LR4-Lite (also called IR4-Lite)
• Fiber type: Single-mode fiber (SMF)
• Connector type: Duplex LC
• Distance: Up to 2 km
• Wavelengths used: Four separate CWDM wavelengths in the ~1270–1330 nm range
• Data rate: 40Gbps total (4 lanes × ~10Gbps each)

Other Recommended:

Cisco SFP-10G-SR Module

Cisco QSFP-40G-LR4 Module

Cisco QSFP-100G-DR-S Module

Cisco SFP-25G-SR-S Module

Cisco Dual Rate QSFP-40/100-SRBD Transceiver Module