100G BiDi QSFP28 80km Transceiver, Side B (Tx 1295-1309nm): BIDI-100G-QSFP28-80B

EdgeOptic's BIDI-100G-QSFP28-80B is a 100 Gigabit Ethernet bidirectional QSFP28 transceiver, carrying full-duplex 100G over a single SMF strand at up to 80 km. It is the Side B counterpart in a matched pair, transmitting on four LAN WDM wavelengths and receiving on four O-Band wavelengths from a Side A module at the far end. Single-fiber operation halves strand count on each span, which matters most where leased dark fiber or duct space is the constraint.

Side B transmits on four LAN WDM channels at 1295.56, 1300.05, 1304.58 and 1309.14 nm and receives on four O-Band channels at 1273.55, 1277.89, 1282.26 and 1286.66 nm. Each direction carries 4x25 Gb/s NRZ for a 103.125 Gb/s aggregate line rate. EML transmitters deliver +2.0 to +6.5 dBm per lane average launch; PIN photodiode receivers reach −28 dBm per lane minimum sensitivity.

The 30 dB optical budget supports 80 km over OS2 single-mode fiber with host RS(528,514) FEC enabled at both ends. Without FEC, usable reach drops well below the rated 80 km. Calculate against the 30 dB budget for each deployment, factoring connector and splice loss plus a margin reserved for aging.

The host electrical interface is CAUI-4 (4x25 Gb/s NRZ) over the QSFP28 MSA connector; the optical interface is a single LC/UPC simplex receptacle. SFF-8636 management exposes per-lane optical power, module temperature, laser bias and supply voltage to the host through DDM/DOM. 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 6.5 W from a single +3.3 V supply, which makes this a high-power QSFP28 module. The host port and line card must support high-power QSFP28 (6.5 W max); some older line cards cap per-port power below this. Operating temperature is 0 to 70 °C commercial, 5 to 85 % humidity, −40 to +85 °C storage.

BiDi modules deploy as matched pairs only. The Side B module (Tx LAN WDM, Rx O-Band) must terminate against a Side A module (BIDI-100G-QSFP28-80A) at the opposite end. Two Side B modules on the same strand will not link: both ends transmit on LAN WDM and listen on O-Band, so neither receiver sees a signal. Verify pair assignment at commissioning and label both ends in the patching record.

Standards compliance covers QSFP28 MSA mechanical and thermal requirements, CAUI-4 electrical, and SFF-8636 management. CE and RoHS certified, Class 1 laser safety per IEC 60825-1. Typical applications: metro backbone, regional carrier interconnects, data center interconnect over leased dark fiber, and enterprise WAN spans up to 80 km on a single fiber strand.

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 matched Side A and Side B pair shipments, contact our sales team.