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The 1.25Gbps Bi-Directional SFP Optical Transceiver is designed for ultra-long-distance communication over single-mode fiber (SMF) up to 120 kilometers. Utilizing LC connectors, the module integrates a 1490nm DFB laser with a 1550nm APD receiver or a 1550nm DFB laser with a 1490nm APD receiver, depending on the configuration. It supports a single +3.3V power supply and a data rate of 1.25Gbps, making it ideal for Ethernet, telecom, and Fiber Channel applications. The module is compliant with IEC-60825 laser safety standards and RoHS directives, ensuring safety and environmental responsibility.
This transceiver operates reliably within a temperature range of 0°C to 70°C for commercial applications and -40°C to 85°C for industrial use, with a power dissipation of only 1W. The transmitter offers an average output power of 0 to +5dBm, with an extinction ratio between 9dB and 15dB, while the receiver provides a sensitivity of -32dBm and an overload threshold of -7dBm. Advanced diagnostic features, including Loss of Signal (LOS) detection, enhance performance monitoring and fault management, making the module a dependable solution for long-distance, high-speed optical communication.
These BiDi SFP modules provide cost-effective long-haul connectivity over a single strand of SMF, supporting Ethernet, Fibre Channel, and telecom networks. Operating from a single +3.3 V supply, they offer LVPECL-compatible I/O, low EMI, and high ESD protection. The devices meet IEC-60825 laser safety and RoHS compliance 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 1490 | 1480 | 1490 | 1500 | nm |
| Center wavelength | Tx 1550 | 1540 | 1550 | 1560 | nm |
| RMS spectral width | Tx 1490 / Tx 1550 | — | — | 1 | nm |
| Average output power | Tx 1490 / Tx 1550 | 0 | — | +5 | dBm |
| Extinction ratio | — | 9 | — | 15 | dB |
| Rise/fall time (20–80%) | — | — | — | 0.26 | ns |
| Total jitter | — | — | — | 0.43 | UI |
| Optical eye: IEEE 802.3z and ANSI Fibre Channel compatible. |
| Parameter | Variant | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Center wavelength | Rx 1550 | 1500 | 1550 | 1600 | nm |
| Center wavelength | Rx 1490 | 1440 | 1490 | 1540 | nm |
| Sensitivity (Rsen) | — | — | — | −32 | dBm |
| Overload (Rov) | — | −7 | — | — | dBm |
| Return loss | — | 12 | — | — | dB |
| LOS assert (LOSA) | — | −45 | — | — | dBm |
| LOS de-assert (LOSD) | — | — | — | −32 | dBm |
| LOS hysteresis | — | 0.5 | — | 5 | dB |
BiDi pair mapping
CT-SFP-BX-120U: 1490 nm DFB Tx / 1550 nm APD Rx
CT-SFP-BX-120D: 1550 nm DFB Tx / 1490 nm APD 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, wavelength codes (1490/1550 nm), vendor PN/revision/date fields.
Pin functions: TX Disable (input with internal 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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