100GBASE-LR4 QSFP28 20km Transceiver: 100G-QSFP28-20

The EdgeOptic 100G-QSFP28-20 is a 100GBASE-LR4 QSFP28 optical module built for 100 Gigabit Ethernet, OTN and Fibre Channel links over single-mode fiber. It carries four wavelength-division-multiplexed lanes at 25 Gbps each across a single duplex fiber pair, delivering up to 112 Gbps of aggregate throughput for extended-reach data center interconnect and metro deployments.

The module uses the four-channel LAN-WDM lane plan defined by IEEE 802.3ba Clause 88, with channels at 1295.56 nm, 1300.05 nm, 1304.58 nm and 1309.14 nm in the 1310 nm band using NRZ modulation. Transmission uses an EML laser array; reception uses a PIN photodiode array. The four channels are multiplexed and de-multiplexed inside the module so the full 100G link runs over one duplex single-mode pair.

Where IEEE 802.3ba specifies 100GBASE-LR4 at 10km, this module extends the same LAN-WDM wavelength grid to 20km per the 100G 4WDM-20 MSA, which adds host-side RS-FEC to reach the longer distance. The 9 dB optical link budget provides roughly 2.7 dB more margin than the 6.3 dB IEEE 802.3ba 10km baseline, useful headroom on older or higher-loss single-mode plant. Per-lane TX power is −1.0 to 4.5 dBm with a minimum 4 dB extinction ratio, and per-lane RX sensitivity is −11 dBm with overload at +3.3 dBm.

The 100G-QSFP28-20 is a hot-pluggable QSFP28 with dual LC/UPC duplex connectors, compliant with the QSFP28 MSA, SFF-8636 and SFF-8665. It ships coded for multiple vendor codes so it drops into mixed-vendor 100G environments. DDM/DOM digital diagnostic monitoring reports per-lane optical power, temperature, bias and supply voltage to the host.

Reliable 20km operation depends on host-side RS-FEC (IEEE 802.3bj Reed-Solomon RS(528,514)) being enabled on the switch or router port. The module presents Host FEC capability to the host; the host port must have RS-FEC turned on for the 20km link to run within error budget. At shorter distances the extra link-budget margin lets the module run without modifying the FEC configuration of an existing 10km LR4 port.

This is a triple-rate module. It carries 100G Ethernet (103.125 Gbps), OTN OTU4 4I1-9D1F (112 Gbps) and 128GFC Gen 6 Fibre Channel (112.2 Gbps). The optical lane plan follows IEEE 802.3ba Clause 88; the 100G CAUI-4 host electrical interface follows IEEE 802.3bm. The module operates from 0 to 70 degrees C at up to 3.5 W on a +3.3 V supply, and is CE marked, RoHS compliant and Class 1 laser rated per IEC 60825-1.

Typical deployments include data center site interconnect, ISP and carrier backbone spans, mobile operator core links, and enterprise campus runs that reach past the 10km limit of standard LR4 without moving to the higher power draw of an ER4 module. For multi-rate sourcing questions or larger rollouts, contact our sales team.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Every 100G-QSFP28-20 ships next business day from EU stock with a lifetime warranty.