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The 25Gbps Bi-Directional SFP28 Transceiver is a high-performance module designed for single-mode fiber (SMF) communication over distances of up to 10 kilometers. Supporting data rates from 24.33Gbps to 25.78Gbps, it is ideal for applications such as 25GE BASE-LR Ethernet and CPRI Option 10/eCPRI. This transceiver is available in two configurations: the CT-SFP28-BX-20U, which features a 1270nm DML laser transmitter and a 1330nm receiver, and the CT-SFP28-BX-20D, which uses a 1330nm DML laser transmitter and a 1270nm receiver. With compliance to SFP28 MSA, SFF-8472, SFF-8431, and SFF-8432 standards, it ensures compatibility with a wide range of networking equipment.
Operating on a +3.3V power supply and consuming less than 1.2W, the module is highly energy-efficient. The transmitter delivers an average optical power output between -4dBm and +4dBm, with an extinction ratio of 3.5dB, while the receiver supports a sensitivity of -11dBm and an overload threshold of +2dBm. Advanced features like Loss of Signal (LOS) detection and integrated digital diagnostics allow real-time monitoring of parameters such as temperature, voltage, bias current, transmitted power, and received power. Designed for commercial (0°C to 70°C) and industrial (-40°C to 85°C) temperature ranges, the hot-pluggable transceiver ensures reliable performance and easy integration into modern networking systems.
These hot-pluggable transceivers support 24.33 to 25.78 Gbps operation and comply with IEEE 802.3cc, SFP28 MSA, SFF-8431, SFF-8432, and SFF-8472 standards. They use a simplex LC connector for single-fiber transmission: BX-20U transmits at 1270 nm and receives at 1330 nm, while BX-20D transmits at 1330 nm and receives at 1270 nm. Designed for 10 km reach, the modules integrate internal CDR on both Tx and Rx chains to ensure low jitter and stable operation. Power consumption is <1.2 W with a single 3.3 V supply, and both commercial (0 °C to +70 °C) and industrial (−40 °C to +85 °C) temperature ranges are available. Integrated DDMI provides real-time monitoring of key operating parameters.
Key Parameters
| Specification | CT-SFP28-BX-20U | CT-SFP28-BX-20D | Notes |
|---|---|---|---|
| Form factor / connector | SFP28 (hot-pluggable), LC simplex | SFP28 (hot-pluggable), LC simplex | Single-fiber bidirectional |
| Data rate | 24.33 – 25.78 Gbps | 24.33 – 25.78 Gbps | Supports rate adaptation |
| Reach | Up to 10 km SMF | Up to 10 km SMF | — |
| Tx wavelength | 1270 nm | 1330 nm | DML laser |
| Rx wavelength | 1330 nm | 1270 nm | PIN/TIA receiver |
| Tx optical power | −4 to +4 dBm | −4 to +4 dBm | Average |
| Extinction ratio | ≥ 3.5 dB | ≥ 3.5 dB | — |
| Spectral width | ≤ 1 nm | ≤ 1 nm | — |
| Side-mode suppression | ≥ 30 dB | ≥ 30 dB | — |
| Tx off power | ≤ –30 dBm | ≤ –30 dBm | — |
| Receiver sensitivity | ≤ −11 dBm (OMA) | ≤ −11 dBm (OMA) | BER ≤ 5 × 10⁻⁵ |
| Receiver overload | +2 dBm max | +2 dBm max | — |
| Receiver reflectance | ≤ –12 dB | ≤ –12 dB | — |
| LOS assert/de-assert | −30 dBm / −17 dBm | −30 dBm / −17 dBm | 0.5 dB hysteresis |
| Supply voltage | 3.14 – 3.46 V | 3.14 – 3.46 V | Single 3.3 V supply |
| Power consumption | <1.2 W | <1.2 W | — |
| Diagnostics | Temp., bias, Tx/Rx power, Vcc | Temp., bias, Tx/Rx power, Vcc | Digital diagnostics (DDMI) |
| Operating case temp. | 0 °C to +70 °C (commercial), −40 °C to +85 °C (industrial) | Same | — |
| Compliance | IEEE 802.3cc, SFP28 MSA, SFF-8431/8432/8472, RoHS, EN 60825 Class 1 | Same | Standards compliant |
At Carritech, we pride ourselves on our exceptional service and commitment to meeting our customers’ needs. Our extensive range of SFP transceivers is designed to cater to various requirements, ensuring that you receive the best solutions for your projects. We understand the importance of timely delivery, and our efficient processes are geared towards providing you with the products you need as quickly as possible. Our dedicated team works tirelessly to ensure that your orders are processed and dispatched promptly, so you can rely on us for swift and reliable service.
We recognise that every project is unique, and our flexible approach allows us to adapt to your specific needs. Whether you require immediate delivery or have more complex requirements, we are here to support you every step of the way. Our commitment to customer satisfaction means that we go above and beyond to ensure that you receive your SFP transceivers in a timely manner, without compromising on quality. Trust Carritech to deliver the solutions you need, when you need them.
At Carritech Optics, we stand by the quality and reliability of our optical transceivers. That’s why we proudly offer a lifetime warranty on all products as a testament to our commitment to excellence and customer satisfaction.
Our lifetime warranty provides comprehensive coverage for the entire lifecycle of your optical transceivers, ensuring you experience complete peace of mind when choosing Carritech Optics. The warranty covers:
Should you ever need to make a warranty claim, our team is here to assist you. Simply contact our support team with your product details, and we’ll guide you through a quick and hassle-free process to resolve the issue.
Carritech Optics is dedicated to providing high-quality optical solutions that you can trust for the long haul. With our lifetime warranty, you can confidently invest in our products, knowing that we’re with you every step of the way.
At Carritech Optics, every product we supply undergoes a meticulous testing process designed to guarantee exceptional quality, reliability, and consistency. Our manufacturer operates within a professional laboratory environment, where advanced testing equipment and industry-standard procedures are used to carefully evaluate each item.
Carritech’s Opticode is an advanced transceiver programming solution that gives you complete flexibility across your optical network. Designed to ensure seamless compatibility with a wide range of OEM systems, Opticode allows you to quickly reconfigure transceivers to meet your specific requirements. The result is greater control, reduced costs, and a more adaptable, future-proof infrastructure.
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