1000BASE-BX-D SFP BiDi 1550nm-TX/1310nm-RX 20km DOM Simplex LC/UPC SMF Optical Transceiver Module

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.

Absolute Maximum Ratings

Operating Conditions

Optical Characteristics (0 °C to +70 °C, Vcc = 3.3 V)

Transmitter

Receiver

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.

Electrical Characteristics (0 °C to +70 °C, Vcc = 3.3 V)

Transmitter I/O

Receiver I/O

EEPROM & Pins (summary)

• 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.

• Gigabit Ethernet and access links over SMF up to 20 km.
• Telecom access and aggregation networks using BiDi optics.
• Fibre Channel SAN extension in campus and metro environments.

• Compact SFP form factor with LC interface.
• Single-fiber BiDi operation with 1310/1550 nm transmitters and PIN receivers.
• Supports up to 20 km reach on SMF.
• 3.3 V power supply, LVPECL-compatible I/O.
• Low EMI, strong ESD protection.
• IEC-60825 laser safety compliant and RoHS compatible.

At Carritech, we pride ourselves on our exceptional service and commitment to meeting our customers’ needs. Our extensive range of SFP transceivers, including the CT-SFP-BX-20D, 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.

What Does Our Lifetime Warranty Cover?

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:

• Defects in Materials and Workmanship: If your product experiences any issues related to manufacturing or materials, we’ll repair or replace it free of charge.
• Performance Assurance: Our optical transceivers are rigorously tested to meet industry standards, and we guarantee they’ll perform as expected in your network environment.

Easy Claims Process

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.

Your Network’s Performance, Guaranteed

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.