




Generic Compatible 100GBASE-LR4 QSFP28 40km Breakout DOM Duplex LC SMF Optical Transceiver Module
QSFP28-103/112-LW-40(ER4)-LCD
- Broad Multi-Brand Compatibility
- Flexible Customization Support
- Tested for Reliable Performance
- Fast Response & Delivery
- Professional Technical Support
The FC-LINK QSFP28 100G LAN-WDM 40km ER4 LC DX is a high-performance 100Gb/s transceiver module designed for optical communication applications compliant with the Ethernet 100GBASE-ER4 standard. It converts four 25Gb/s electrical input channels into four LAN WDM optical signals, multiplexing them into a single channel for 100Gb/s optical transmission. On the receiver side, it de-multiplexes the 100Gb/s optical input back into four LAN WDM optical signals and converts them into four electrical output channels.The central wavelengths of the four LAN WDM channels are 1295.56nm, 1300.05nm, 1304.58nm, and 1309.14nm, consistent with the LAN WDM wavelength grid defined in IEEE 802.3ba. Equipped with high-performance cooled LAN WDM DFB transmitters and high-sensitivity APD receivers, the module ensures exceptional performance for 100Gigabit Ethernet applications over links up to 40km.Designed according to the QSFP+ Multi-Source Agreement (MSA), the transceiver features a compact form factor, reliable optical/electrical connections, and a digital diagnostic interface. Built to withstand extreme operating conditions, including high temperatures, humidity, and EMI interference, it ensures robust and reliable performance in demanding environments.
| SPECIFICATIONS | |||
|---|---|---|---|
| Product Model | QSFP28-103/112-LW-40(ER4)-LCD | Manufacturer brand | FC-LINK |
| Package Type | QSFP28 | Optical connector | LC DX |
| Max Data Rate | 103.1Gbps | Channel Data Rate | 25.78125Gbps |
| Effective transmission distance | 40km | ||
| Wavelength | 1310nm | Operating voltage | 3.3V |
| Fiber Type | SMF | Core Size | 9/125 |
| Transmitter Type | DFB | Receiver Type | PIN |
| TX Power | -2.9~4.5dBm | Receiver Sensitivity | -18.6dBm |
| Digital Optical Monitoring(DOM) | YES | Receiver Overload | -4.9dBm |
| Power Consumption | <4.5W | Protocols | 100GBASE-ER4 Ethernet Links Infiniband QDR and DDR interconnects |
| Operating temperature(Commercial) | 0℃~+70℃ | Storage Temperature(Commercial) | -40℃~+85℃ |

Server-to-Switch Data Center Links
Used for 10G/25G/100G optical uplinks between servers and top-of-rack switches in high-density data center deployments.

Building-to-Building Campus Backbone
Suitable for 1G/10G fiber links between office buildings, campus distribution rooms, and backbone aggregation points.

Access-to-Core Enterprise Uplinks
Designed for switch uplinks from access to aggregation or core layers in enterprise and campus network architectures.

Industrial Switching in Harsh Environments
Applied in industrial Ethernet, automation systems, and outdoor cabinets where wider temperature tolerance and stable fiber communication are required.
| Absolute Maximum Ratings | |||||||||
| Parameter | Symbol | Min. | Max. | Unit | |||||
| Supply voltage | VCC | -0.5 | 3.6 | V | |||||
| Storage temperature | TC | -20 | 85 | ℃ | |||||
| Relative humidity | RH | 5 | 85 | % | |||||
| These values represent the damage threshold of the module.Stress in excess of any of theindividual absolute maximum ratings can cause immediate catastrophic damage to the module even if all other parameters are within recommended operating conditions. | |||||||||
| Recommended Operating Environment | |||||||||
| Parameter | Symbol | Min | Typical | Max | Unit | ||||
| Power supply voltage | VCC | 3.13 | 3.3 | 3.47 | V | ||||
| Operating case temperature | Tca | 0 | - | 70 | ℃ | ||||
| Data rate per lane | fd | - | 25.78125 | - | Gb/s | ||||
| Link distance | D | - | - | 40 | km | ||||
| Electrical Characteristics | |||||||||
| Parameter | Symbol | Min | Typical | Max | Unit | Ref | |||
| Transmitter Section: | |||||||||
| Input differential impedance | Rin | 90 | 100 | 110 | Ω | 1 | |||
| Differential input voltage amplitude | Vin | 900 | - | - | mVp-p | 2 | |||
| Receiver | |||||||||
| Output differential impedance | Rout | 90 | 100 | 110 | Ω | 1 | |||
| Differential output voltage amplitude | Vout | - | - | 900 | mVp-p | 3 | |||
| Notes: [1]AC coupled. [2]Differential input voltage amplitude is measuredbetween TxnP and TxnN. [3]Differentialoutput voltage amplitude is measured between RxnP and RxnN. | |||||||||
| TransmitterSpecifications-Optical | |||||||||
| Parameter | Symbol | Min | Typical | Max | Unit | ||||
| Center wavelength | Ch0 | λ0 | 1294.53 | 1295.56 | 1296.59 | nm | |||
| Ch1 | λ1 | 1299.02 | 1300.05 | 1301.09 | nm | ||||
| Ch2 | λ2 | 1303.54 | 1304.58 | 1305.63 | nm | ||||
| Ch3 | λ3 | 1308.09 | 1309.14 | 1310.09 | nm | ||||
| Bit rate per channel | BR | 25.78125±100ppm | Gb/s | ||||||
| Side mode suppression ratio | SMSR | 30 | - | - | dB | ||||
| Average launch power,each lane | - | -2.9 | - | 4.5 | dBm | ||||
| Launch power in OMA minus TDP,each lane | OMA-TDP | -0.65 | - | - | dBm | ||||
| Transmission & dispersion penalty, each lane | TDP | - | - | 2.5 | dB | ||||
| Relative intensity noise | RIN | - | - | -130 | dB/Hz | ||||
| Transmitter reflectance | RT | - | - | -12 | dB | ||||
| Extinction ratio | ER | 7 | - | - | dB | ||||
| Transmitter eyemask definition {X1,X2,X3,Y1,Y2,Y3} | {0.25,0.4,0.45,0.25,0.28,0.4} | ||||||||
| Average launch power of OFF transmitter,each lane | - | - | - | -30 | dBm | ||||
| Optical return loss tolerance | - | - | - | 20 | dB | ||||
| Receiver Specifications-Optical | |||||||||
| Parameter | Symbol | Min. | Typical | Max. | Unit | ||||
| Center wavelength | Ch0 | λ0 | 1294.53 | 1295.56 | 1296.59 | nm | |||
| Ch1 | λ1 | 1299.02 | 1300.05 | 1301.09 | nm | ||||
| Ch2 | λ2 | 1303.54 | 1304.58 | 1305.63 | nm | ||||
| Ch3 | λ3 | 1308.09 | 1309.14 | 1310.09 | nm | ||||
| Bit rate per channel | BR | 25.78125±100ppm | Gb/s | ||||||
| Damage threshold,each lane | - | - | - | -3 | dBm | ||||
| Averagereceive power,each lane | - | -20.9 | - | -4.9 | dbm | ||||
| Unstressed sensitivity(OMA) at 5×10⁵BER | OMA | - | - | -18.6 | dBm | ||||
| LOS assert | LOSA | -30 | - | - | dBm | ||||
| LOS de-assert | LOSD | - | - | -24 | dBm | ||||
| Pin Descriptions |
| Pin Definition | |||||||||
| Pin | Symbol | Name/Description | |||||||
| 1 | GND | Ground | |||||||
| 2 | Tx2n | Transmitter inverted data input | |||||||
| 3 | Tx2p | Transmitter non-inverted data input | |||||||
| 4 | GND | Ground | |||||||
| 5 | Tx4n | Transmitter inverted data input | |||||||
| 6 | Tx4p | Transmitter non-inverted data input | |||||||
| 7 | GND | Ground | |||||||
| 8 | ModSelL | Module select | |||||||
| 9 | ResetL | Module reset | |||||||
| 10 | VCCRx | +3.3V power supply receiver | |||||||
| 11 | SCL | 2-wire serial interface clock | |||||||
| 12 | SDA | 2-wire serial interface data | |||||||
| 13 | GND | Ground | |||||||
| 14 | Rx3p | Receiver non-inverted data output | |||||||
| 15 | Rx3n | Receiver inverted data output | |||||||
| 16 | GND | Ground | |||||||
| 17 | Rxlp | Receiver non-inverted data output | |||||||
| 18 | Rx1n | Receiver inverted data output | |||||||
| 19 | GND | Ground | |||||||
| 20 | GND | Ground | |||||||
| 21 | Rx2n | Receiver inverted data output | |||||||
| 22 | Rx2p | Receiver non-inverted data output | |||||||
| 23 | GND | Ground | |||||||
| 24 | Rx4n | Receiver inverted data output | |||||||
| 25 | Rx4p | Receiver non-inverted data output | |||||||
| 26 | GND | Ground | |||||||
| 27 | ModPrsL | Module present | |||||||
| 28 | IntL | Interrupt | |||||||
| 29 | VCCTx | +3.3V power supply transmitter | |||||||
| 30 | VCC1 | +3.3V power supply | |||||||
| 31 | LPMode | Low power mode | |||||||
| 32 | GND | Ground | |||||||
| 33 | Tx3p | Transmitter non-inverted data input | |||||||
| 34 | Tx3n | Transmitter inverted data input | |||||||
| 35 | GND | Ground | |||||||
| 36 | Txlp | Transmitter non-inverted data input | |||||||
| 37 | Tx1n | Transmitter inverted data input | |||||||
| 38 | GND | Ground | |||||||

Performance Testing
Each module is tested before shipment to help ensure stable optical and electrical performance.

Compatibility Verification
Compatibility validation is available for major switch and router platforms.

Reliability Screening
Selected products support aging, temperature cycle, and stability testing for demanding applications.

Traceable Quality Control
Inspection and production records support more consistent quality control and batch traceability.
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