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The QSFP+ 40G-LRL4 module is a highly integrated 4x10G transceiver focused on reach, bandwidth, density and cost for 40GE applications. The module incorporates four independent channels, on ITU G.694.2 CWDM (near 1300nm) wavelength grid, operating between 9.95 and 11.318Gbs per channel. The transmitter path incorporates four laser drivers and DML lasers together with an optical multiplexer. On the receiver path, an optical demux is coupled with 4-channel photodiodes and limiting TIAs.


This product is built on the LightScale®2 platform.

• Supports 40G operation
• Reach: 1 km reach via single mode fiber
• Optical link budget: -6dBm min Tx OMA and -11.5 dBm max Rx sensitivity
• External reference clock is not required
• Single 3.3 V power supply
• Lasers: uncooled CWDM DFB lasers, directly modulated
• Electrical interface: compliant with 40G Ethernet IEEE 802.3ba (XLPPI)
• Fiber connector: SMF LC duplex connector
• MSA-compliant performance monitoring via I2C interface
• Receiver monitoring, receiver signal strength indicator (RSSI), for link diagnostics and loopback
• Transmitter optical power monitoring (TPM) for laser power calibration and link diagnostics
• AC coupling caps are placed inside the module in both transmitting and receiving paths
• Hot pluggable 38-pin electrical interface: the module allows hot pluggability for ease of installation and service
• 0–70°C transceiver operating case temperature
• Power dissipation < 3.5W
• Blue pull tab

•  Data center interconnects