25G LWDM O-Band SFP28 Transceiver for 40km SMF Links, Duplex LC
SFP28-25-LWD-40-LCD
- Broad Multi-Brand Compatibility
- Flexible Customization Support
- Tested for Reliable Performance
- Fast Response & Delivery
- Professional Technical Support
The FC-LINK SFP28 25G LWDM 40km LC DX transceiver is a compact and high-performance optical module designed for 25GBASE-ER Ethernet applications. It converts 25Gbps serial CML electrical signals into serial optical data and ensures compliance with the 25GBASE-ER standard.Equipped with an EML transmitter and an APD receiver, this transceiver delivers exceptional performance for single-mode fiber (SMF) links up to 40km. It adheres to SFF-8431, SFF-8432, and IEEE 802.3CC standards, offering reliable and consistent functionality.Digital diagnostic monitoring is accessible via a 2-wire serial interface, as defined by the SFF-8472 specification. The fully compliant SFP28 form factor supports hot pluggability, simplifies optical port upgrades, and minimizes EMI emissions, making it an ideal solution for high-speed network environments.
| SPECIFICATIONS | |||
|---|---|---|---|
| Product Model | SFP28-25-LWO-40-LCD | Manufacturer Brand | FC-LINK |
| Package Type | SFP28 | Optical Connector | Duplex LC |
| Max Data Rate | 25.78G | Channel Data Rate | - |
| Effective Transmission Distance | 40km | ||
| Wavelength | 1286.66nm 1291.10nm 1295.56nm 1300.05nm 1304.58nm 1309.14nm | Operating Voltage | 3.3V |
| Fiber Type | SMF | Core Size | 9/125µm |
| Transmitter Type | EML LWDM | Receiver Type | APD |
| TX Power | -2~6dBm | Receiver Sensitivity | <-19dBm |
| Digital Optical Monitoring(DOM) | YES | Receiver Overload | - |
| Power Consumption | 1.5W | Protocols | SFF-8431, SFF-8472, IEEE 802.3CC |
| 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.
Compatible Brands
Customization Options
Vendor Coding
Private Label
Custom Part Number
Packaging Design
Temperature Grade Selection
| Absolute Maximum Ratings | |||||||||
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref. | |||
| Storage temperature | TS | -40 | - | +85 | ℃ | - | |||
| Case operating temperature | TA | 0 | - | 70 | ℃ | - | |||
| Maximum supply voltage | VCC | 0 | - | 3.6 | V | - | |||
| Relative humidity | RH | 5 | - | 95 | % | - | |||
| Electrical Characteristics | |||||||||
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref. | |||
| Supply voltage | VCC | 3.135 | - | 3.465 | V | - | |||
| Supply current | Icc | - | - | 606 | mA | - | |||
| Power consumption | P | - | - | 2 | W | - | |||
| Data rate | R | - | 25.78 | - | Gb/s | - | |||
| Transmitter section: | |||||||||
| Input differential impedance | Rin | - | 100 | - | Ω | 1 | |||
| Tx input single ended DC voltage tolerance (ref VeeT) |
V | -0.3 | - | 4 | V | - | |||
| Differential input voltage swing | Vin,pp | 180 | - | 700 | mV | 2 | |||
| Transmit disable voltage | VD | 2 | - | VCC | V | - | |||
| Transmit enable voltage | VEN | Vee | - | Vee+0.8 | V | - | |||
| Receiver section: | |||||||||
| Single ended output voltage tolerance | V | -0.3 | - | 4 | V | - | |||
| Rx output diff voltage | VO | 150 | - | 900 | mV | - | |||
| Rx output rise and fall time | Tr/Tf | 9.5 | - | - | ps | 3 | |||
| LOS fault | VLOS fault | 2 | - | VCCHOST | V | 4 | |||
| LOS normal | VLOS norm | Vee | - | Vee+0.8 | V | 4 | |||
| Notes: 1.Connected directly to TX data input pins. AC coupling from pins into laser driver IC. 2.Per SFF-8431 Rev 3.0 3.20%～80% 4.LOS is an open collector output. Should be pulled up with 4.7k – 10kΩ on the host board. Normal operation is logic 0; loss of signal is logic 1. Maximum pull-up voltage is 5.5V. |
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| Optical Characteristics | |||||||||
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Ref. | |||
| Transmitter section: | |||||||||
| Center Wavelength | λt | 1285.51 | 1286.66 | 1287.81 | nm | - | |||
| 1289.95 | 1291.1 | 1292.25 | |||||||
| 1294.41 | 1295.56 | 1296.71 | |||||||
| 1298.9 | 1300.05 | 1301.2 | |||||||
| 1303.43 | 1304.58 | 1305.73 | |||||||
| 1307.99 | 1309.14 | 1310.29 | |||||||
| spectral width | △λ | - | - | 1 | nm | - | |||
| Average optical power | Pavg | -2.0 | - | +6 | dBm | 1 | |||
| Laser off power | Poff | - | - | -30 | dBm | - | |||
| Extinction ratio | ER | 4 | - | - | dB | - | |||
| Receiver section: | - | - | - | - | - | - | |||
| Center wavelength | λr | 1295 | - | 1325 | nm | - | |||
| Receiver sensitivity(OMA) | Sen | - | - | -19 | dBm | 2 | |||
| Stressed sensitivity(OMA) | Sen2 | - | - | -16.5 | dBm | 2 | |||
| Los sssert | LOSA | -30 | - | - | dBm | - | |||
| Los dessert | LOSD | - | - | -20 | dBm | - | |||
| Los hysteresis | LOSH | 0.5 | - | 5 | dB | - | |||
| Overload | Sat | -6 | - | - | dBm | 3 | |||
| Receiver reflectance | Rrx | - | - | -12 | dB | - | |||
| Notes: 1.Average power figures are informative only, per IEEE802.3CC. 2.Conditions of stressed receiver tests per IEEE802.3CC. At 5E-5 BER. 3.Receiver overload specified in OMA and under the worst comprehensive stressed condition. |
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| Timing Characteristics | |||||||||
| Parameter | Symbol | Min. | Typ. | Max. | Unit | ||||
| TX_disable assert time | t_off | - | - | 100 | us | ||||
| TX_disable negate time | t_on | - | - | 2 | ms | ||||
| Time to initialize include reset of TX_FAULT | t_int | - | - | 300 | ms | ||||
| TX_FAULT from fault to assertion | t_fault | - | - | 1 | ms | ||||
| TX_disable time to start reset | t_reset | 10 | - | - | us | ||||
| Receiver loss of signal assert time | TA,RX_LOS | - | - | 100 | us | ||||
| Receiver loss of signal de assert time | Td,RX_LOS | - | - | 100 | us | ||||
| Rate-select chage time | t_ratesel | - | - | 10 | us | ||||
| Serial ID clock time | t_serial-clock | - | - | 100 | kHz | ||||
| Digital Diagnostic Monitoring Information | |||||||||
| Data Address | Parameter | Accuracy | Unit | ||||||
| 96-97 | Transceiver internal temperature | ±3.0 | ℃ | ||||||
| 98-99 | VCC3 internal supply voltage | ±3.0 | % | ||||||
| 100-101 | Laser bias current | ±10 | % | ||||||
| 102-103 | Tx output power | ±2.0 | dBm | ||||||
| 104-105 | Rx input power | ±2.0 | dBm | ||||||
| PIN ASSIGNMENT |
| Pin | Name | Function | Notes | ||||||
| 1 | VeeT | Module transmitter ground | 1 | ||||||
| 2 | TX fault | Module transmitter fault | 2 | ||||||
| 3 | TX disable | Transmitter disable; Turns off transmitter laser output | 3 | ||||||
| 4 | SDL | 2 wire serial interface data input/output (SDA) | 4 | ||||||
| 5 | SCL | 2 wire serial interface clock input (SCL) | 4 | ||||||
| 6 | MOD_ABS | Module absent, connect to VeeR or VeeT in the module | 2 | ||||||
| 7 | RS0 | Rate select0, optionally control SFP+ receiver. When high, input data rate >4.5Gb/ s; when low, input data rate <=4.5Gb/s | - | ||||||
| 8 | LOS | Receiver Loss of signal indication | - | ||||||
| 9 | RS1 | Rate select0, optionally control SFP+ transmitter. When high, input data rate >4.5Gb/s; when low, input data rate <=4.5Gb/s |
- | ||||||
| 10 | VeeR | Module receiver ground | 1 | ||||||
| 11 | VeeR | Module receiver ground | 1 | ||||||
| 12 | RD- | Receiver inverted data out put | - | ||||||
| 13 | RD+ | Receiver non-inverted data out put | - | ||||||
| 14 | VeeR | Module receiver ground | 1 | ||||||
| 15 | VccR | Module receiver 3.3V supply | - | ||||||
| 16 | VccT | Module transmitter 3.3V supply | - | ||||||
| 17 | VeeT | Module transmitter ground | 1 | ||||||
| 18 | TD+ | Transmitter non-inverted data out put | - | ||||||
| 19 | TD- | Transmitter inverted data out put | - | ||||||
| 20 | VeeT | Module transmitter ground | 1 | ||||||
| Notes: 1.The module ground pins shall be isolated from the module case. 2.This pin is an open collector/drain output pin and shall be pulled up with 4.7K-10Kohms to Host_Vcc on the host board. 3.This pin shall be pulled up with 4.7K-10Kohms to VccT in the module. 4.This pin is an open collector/drain output pin and shall be pulled up with 4.7K-10Kohms to Host_Vcc on the host board. |
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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.
