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The CT-SFP-BX-20U and CT-SFP-BX-20D are compact, high-performance bi-directional (BIDI) SFP optical transceivers designed for 1.25Gbps data transmission over single-mode fiber (SMF) up to 20 kilometers. The modules utilize a 1310nm FP laser and a 1550nm PIN photodetector for CT-SFP-BX-20U and a 1550nm DFB laser with a 1310nm PIN photodetector for CT-SFP-BX-20D. These transceivers are housed in an SFP package with LC connectors, ensuring compatibility with Ethernet, Telecom, and Fiber Channel applications. The design adheres to the IEC-60825 laser safety standards and complies with RoHS requirements.
Key features include a single +3.3V power supply, LVPECL-compatible data interfaces, excellent ESD protection, and low electromagnetic interference (EMI). Operating temperatures range from -40°C to +85°C for industrial-grade and 0°C to +70°C for commercial-grade applications. Optical characteristics like a 1310nm/1550nm center wavelength, low jitter, and high extinction ratios further enhance performance, making these transceivers suitable for robust and reliable long-distance communication systems.
These BiDi SFP modules are designed for Ethernet, Fibre Channel, and telecom networks where reliable short-to-medium reach single-fiber connectivity is required. They operate on a single +3.3 V supply, provide LVPECL-compatible I/O, and are built with low EMI and high ESD protection. Modules comply with IEC-60825 laser safety and RoHS standards.
| Parameter | Symbol | Min | Max | Units |
|---|---|---|---|---|
| Storage temperature | Tst | −40 | +85 | °C |
| Supply voltage | Vcc | 0 | +3.6 | V |
| Operating relative humidity | RH | 5 | 95 | % |
| Parameter | Symbol | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply voltage | Vcc | 3.15 | 3.3 | 3.45 | V |
| Case temperature (Commercial) | Tc | 0 | — | +70 | °C |
| Case temperature (Industrial) | — | −40 | — | +85 | °C |
| Power dissipation | — | — | — | 1 | W |
| Data rate | — | — | 1.25 | — | Gbps |
| Parameter | Variant | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Center wavelength | Tx 1310 | 1260 | 1310 | 1360 | nm |
| Center wavelength | Tx 1550 | 1540 | 1550 | 1560 | nm |
| RMS spectral width | Tx 1310 | — | — | 4 | nm |
| RMS spectral width | Tx 1550 | — | — | 1 | nm |
| Average output power | Tx 1310 | −8 | — | −3 | dBm |
| Average output power | Tx 1550 | −8 | — | 0 | dBm |
| Extinction ratio | — | 10 | — | 15 | dB |
| Rise/fall time (20–80%) | — | — | — | 0.26 | ns |
| Total jitter | — | — | — | 0.43 | UI |
| Optical eye: IEEE 802.3z and ANSI Fibre Channel compliant. |
| Parameter | Variant | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Center wavelength | Rx 1550 | 1500 | 1550 | 1600 | nm |
| Center wavelength | Rx 1310 | 1260 | 1310 | 1360 | nm |
| Sensitivity (Rsen) | — | — | — | −24 | dBm |
| Overload (Rov) | — | −3 | — | — | dBm |
| Return loss | — | 12 | — | — | dB |
| LOS assert (LOSA) | — | −36 | — | — | dBm |
| LOS de-assert (LOSD) | — | — | — | −24 | dBm |
| LOS hysteresis | — | 0.5 | — | 5 | dB |
BiDi pair mapping
CT-SFP-BX-20U: 1310 nm FP Tx / 1550 nm PIN Rx
CT-SFP-BX-20D: 1550 nm DFB Tx / 1310 nm PIN Rx.
| Parameter | Symbol | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input differential impedance | Zin | 90 | 100 | 110 | Ω |
| Data input swing (diff.) | Vin | 500 | — | 2400 | mV |
| TX Disable — High (disable) | — | 2.0 | — | Vcc | V |
| TX Disable — Low (enable) | — | 0 | — | 0.8 | V |
| TX Fault — Assert | — | 2.0 | — | Vcc | V |
| TX Fault — De-assert | — | 0 | — | 0.8 | V |
| Parameter | Symbol | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Output differential impedance | Zout | — | 100 | — | Ω |
| Data output swing (diff.) | Vout | 370 | — | 2000 | mV |
| Rx_LOS — Assert | — | 2.0 | — | Vcc | V |
| Rx_LOS — De-assert | — | 0 | — | 0.8 | V |
EEPROM (A0h): includes SFP identifier, LC connector, 1.25 Gbps nominal BR, LOS/TX_DISABLE/TX_FAULT support, and wavelength codes for 1310/1550 nm operation.
Key pins: TX Disable (input with pull-up), TX Fault (open collector), LOS (open collector), MOD-DEF[0:2] for 2-wire serial ID. TD± and RD± are AC-coupled differential 100 Ω pairs.
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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