




Generic Compatible 200G FR4 QSFP56 2km DOM Duplex LC SMF Optical Transceiver Module
QSFP56-200(4×50)-CW4-2(FR4)-LCD
- Broad Multi-Brand Compatibility
- Flexible Customization Support
- Tested for Reliable Performance
- Fast Response & Delivery
- Professional Technical Support
The FC-LINK QSFP56 200G (4x50G) CWDM4 2km FR4 LC DX Transceiver is a high-performance, hot-pluggable module designed for optical data transmission at 50Gbps per channel using PAM4 modulation. It supports data links over single-mode fiber at distances of up to 2km and is housed in a compact QSFP56 package. The transceiver integrates advanced components, including a high-performance laser diode (LD), photodetector (PIN), and digital signal processor (DSP), ensuring reliable and efficient operation for demanding data communication applications.
| SPECIFICATIONS | |||
|---|---|---|---|
| Product Model | QSFP56-200(4x50)-CW4-2(FR4)-LCD | Manufacturer brand | FC-LINK |
| Package Type | QSFP56 | Optical connector | LC DX |
| Max Data Rate | 200Gbps | Channel Data Rate | 26.5625Gbps |
| Effective transmission distance | 2km | ||
| Wavelength | 1310nm | Operating voltage | 3.3V |
| Fiber Type | SMF | Core Size | 9/125 |
| Transmitter Type | CWDM LD&PD | Receiver Type | PIN |
| TX Power | -4.2~4.7dBm | Receiver Sensitivity | -6dBm |
| Digital Optical Monitoring(DOM) | YES | Receiver Overload | 4.7dBm |
| Power Consumption | <6.5W | Protocols | 200G BASE-FR4 Ethernet Switch & Router Connections Data Centers Other 200G interconnect Requirements |
| 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 | |||||
| Power supply voltage | VCC | -0.5 | 3.6 | V | |||||
| Storage temperature | TC | -40 | 85 | ℃ | |||||
| Relative humidity | RH | 5 | 85 | % | |||||
| These values represent the damage threshold of the module.Stress in excess of any of the individual absolute maximum ratingscan 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 | 3.135 | 3.3 | 3.465 | V | ||||
| Operating case temperature | Tca | 0 | - | 70 | ℃ | ||||
| Recommended operating environment specifies parameters for which the electrical and optical characteristics hold unless otherwise noted. | |||||||||
| Electrical Characteristics | |||||||||
| Parameter | Symbol | Min | Typical | Max | Unit | Notes | |||
| Signaling rate per lane | - | - | 26.5625 | - | Gbd | - | |||
| Transmitter | |||||||||
| Differential data input voltage | △Vin | 900 | - | - | mVp-p | - | |||
| DifferentialInput Impedance | Zin | 90 | 100 | 110 | ohm | - | |||
| Receiver | |||||||||
| Differential output voltage | Vout | - | - | 900 | mVp-p | - | |||
| Differential output impedance | Rout | 90 | 100 | 110 | ohm | - | |||
| Optical Characteristics | |||||||||
| Parameter | Symbol | Min | Typical | Max | Unit | Notes | |||
| Transmitter | |||||||||
| Center wavelength | Ch0 | λ0 | 1264.5 | 1271 | 1277.5 | nm | - | ||
| Ch1 | λ1 | 1284.5 | 1291 | 1297.5 | |||||
| Ch2 | λ2 | 1304.5 | 1311 | 1317.5 | |||||
| Ch3 | λ3 | 1324.5 | 1331 | 1337.5 | |||||
| Side-mode suppression ratio | SMSR | 30 | - | - | dB | - | |||
| Average optical power | Po | -4.2 | - | 4.7 | dBm | - | |||
| Tx OMA per lane | TxOMA | -1.2 | - | 4.5 | dBm | - | |||
| Extinction ratio | ER | 3.5 | - | - | dBm | - | |||
| Optical modulation amplitude | OMA | -4.5 | - | 3 | dB | - | |||
| Transmitter and dispersion eye closure for PAM4 per lane | TDECQ | - | - | 3.3 | dB | - | |||
| Optical return loss tolerance | ORL | - | - | 16.5 | dB | - | |||
| Relative intensity noise | RIN | - | - | -132 | dB/Hz | - | |||
| Receiver | |||||||||
| Center wavelength | Ch0 | λ0 | 1264.5 | 1271 | 1277.5 | nm | - | ||
| Ch1 | λ1 | 1284.5 | 1291 | 1297.5 | |||||
| Ch2 | λ2 | 1304.5 | 1311 | 1317.5 | |||||
| Ch3 | λ3 | 1324.5 | 1331 | 1337.5 | |||||
| Damage threshold | DT | 5.7 | - | - | dBm | - | |||
| Average receive power ,each lane | - | -8.2 | - | 4.7 | dBm | - | |||
| Receiver reflectance | Rfl | - | - | -26 | dB | - | |||
| Difference in receive power between any two lanes | - | - | - | 4.1 | dB | - | |||
| Receiver sensitivity(OMAouter) | - | - | - | -6 | dBm | - | |||
| Stressed receiver sensitivity(OMAouter) | - | - | - | -3.6 | dBm | - | |||
| The following optical characteristics are defined over the recommended operating environment unless otherwise specified. | |||||||||
| QSFP56 Transceiver Electrical Pad Layout |
| 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 dataInput | |||||||
| 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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