100G-LR Single Lambda QSFP28 10km Transceiver: 100G-QSFP28-SL10

The 100G-QSFP28-SL10 is a multi-vendor compatible 100GBASE-LR1 QSFP28 transceiver designed for 100 Gigabit Ethernet over duplex single-mode fiber at up to 10 km. Compliant with IEEE 802.3cu and the 100G Lambda MSA, the module carries the full 100 Gb/s payload on a single optical wavelength using PAM4 modulation, replacing the four-wavelength 25G NRZ architecture of 100GBASE-LR4 with a simpler optical path that suits metro interconnects and extended-reach campus deployments.

The transmitter operates in the 1304.5 to 1317.5 nm range, centered near 1310 nm, at 53.125 GBaud PAM4 for a 106.25 Gb/s line rate. An EML (Electro-absorption Modulated Laser) drives the optical lane and a PIN photodiode receiver recovers the signal at the far end. Single-lambda PAM4 carries the same 100G payload over a duplex fiber pair without the wavelength-multiplexing optics that LR4 requires, which lowers component count inside the module and gives a simpler optical interface for engineers to terminate and troubleshoot.

The 6.3 dB optical link budget supports transmission distances up to 10 km over standard G.652 single-mode fiber. TX launch power ranges from −1.4 dBm minimum to +4.5 dBm maximum per lane, with RX sensitivity at −7.7 dBm minimum and overload tolerance up to +5.5 dBm. At a typical installed-fiber attenuation of 0.35 dB/km at 1310 nm, the budget accommodates 10 km with margin reserved for connector loss, splice loss, and optical aging across the link's service life.

FEC is handled inside the module. A built-in DSP gearbox converts the host's CAUI-4 four-lane 25G NRZ electrical interface to a single 106.25 Gb/s PAM4 optical lane and applies RS(544,514) KP4 forward error correction on the optical side. The host-side CAUI-4 lanes do not run their own FEC. On most 100G QSFP28 ports the switch or router exposes a per-port FEC mode setting; this module requires that host-side FEC be disabled. Enabling host FEC alongside the module's internal FEC causes double-correction errors and link instability. Verify the host port's FEC mode at link bring-up before declaring the span operational.

The optical interface is a duplex LC/UPC receptacle on standard G.652 single-mode fiber. The electrical interface conforms to QSFP28 MSA mechanical and SFF-8636 / SFF-8665 management specifications. SFF-8636 DDM/DOM exposes transmitted and received optical power, module temperature, laser bias current, and supply voltage to the host for monitoring. EdgeOptic encodes the EEPROM with vendor-specific identifiers so the module is recognized as native by the target switching, routing, or transport platform at link-up.

Maximum power consumption is 4.5 W from a single +3.3 V supply, which lands within the standard QSFP28 power class. No high-power port designation is required on the host line card. Operating temperature is 0 to 70 °C (commercial grade); storage temperature ranges from −40 to +85 °C. Standards compliance covers QSFP28 MSA, SFF-8636, SFF-8665, IEEE 802.3cu, and 100G Lambda MSA. CE and RoHS certified, Class 1 laser safety per IEC 60825-1 and FDA.

Typical applications: data center site interconnects, metro carrier aggregation, ISP backbone links, and enterprise campus core spans up to 10 km. Single-lambda PAM4 uses the same per-lane modulation as 400G systems such as 400GBASE-DR4 and 400GBASE-FR4, making LR1 architecturally consistent with the 400G PAM4 lane family; LR1 itself is not optically interoperable with 400G interfaces directly, but 400G platforms that support 100G breakout modes can run LR1 modules on individual sub-ports. LR1 itself runs as a single duplex LC pair, not as an MPO breakout; only 100GBASE-DR uses MPO-12 parallel single-mode fiber for breakout into 4x25G fan-outs.

Backed by 15+ years of EdgeOptic compatibility engineering across vendor optical platforms. Ships next business day from EU stock with a lifetime warranty. For volume pricing, vendor-specific EEPROM coding, or technical questions on 100GBASE-LR1 deployment, contact our sales team.