Introduction to 155M SFPs
Optical transceivers play a crucial role in modern telecommunications and data networks. Among the widely used options, 155M SFPs—often referred to as OC-3 or STM-1 transceivers—are a standard for low to medium-speed optical communications. These transceivers are used in applications such as SONET (Synchronous Optical Network), SDH (Synchronous Digital Hierarchy), and Ethernet-based network solutions.
Within this category, two important types of optical transceivers exist: BIDI (Bi-Directional) transceivers and Duplex transceivers. Understanding the differences and advantages of each can help in selecting the right solution for specific networking requirements.
What Are 155M Duplex SFPs?
Duplex optical transceivers use two fiber strands for communication: one for transmitting (Tx) and one for receiving (Rx). This traditional setup ensures reliable data transmission with minimal interference. These transceivers typically use LC, SC, or ST connectors and operate on various wavelengths depending on the required transmission distance.
Key Features of Duplex 155M SFPs:
- Uses Two Fibers: One for transmitting and one for receiving.
- Higher Stability: Ideal for longer distances with reduced crosstalk.
- Common Wavelengths: 850nm (multimode) and 1310nm/1550nm (single mode).
- Applications: SDH/SONET networks, Ethernet links, and industrial automation.
What Are 155M BIDI SFPs?
BIDI (Bi-Directional) transceivers, unlike Duplex transceivers, use a single fiber to transmit and receive data by leveraging wavelength-division multiplexing (WDM) technology. These transceivers work in pairs, with one device transmitting at one wavelength (e.g., 1310nm) and receiving at another (e.g., 1550nm), while the paired transceiver does the opposite.
Key Features of BIDI 155M SFPs:
- Uses Single Fiber: Reduces fiber usage by 50% compared to Duplex.
- Wavelength-Paired Operation: Typical combinations include 1310nm/1550nm or 1490nm/1550nm.
- Cost-Efficient: Ideal for networks where fiber resources are limited.
- Applications: Fiber-to-the-Home (FTTH), Passive Optical Networks (PON), and point-to-point connections.
Comparing BIDI vs. Duplex SFPs
| Feature | BIDI Transceivers | Duplex Transceivers |
|---|---|---|
| Fiber Usage | Single fiber | Two fibers |
| Transmission Method | Wavelength-division multiplexing (WDM) | Separate Tx/Rx fibers |
| Cost Efficiency | More cost-effective when fiber availability is limited | Requires additional fiber infrastructure |
| Common Applications | FTTH, PON, point-to-point links | SDH/SONET, Ethernet, industrial automation |
| Connector Types | LC simplex | LC, SC, ST duplex |
Choosing the Right 155M SFP
When deciding between a BIDI and Duplex 155M optical transceiver, consider the following:
- Network Infrastructure: If fiber is limited, BIDI transceivers can help optimize resource usage.
- Transmission Distance: Duplex transceivers are often preferred for longer distances.
- Cost Considerations: BIDI transceivers reduce fiber leasing costs but require compatible WDM configurations.
- Application Requirements: Ensure compatibility with existing networking equipment and protocols.
Learn More About Optical Transceivers
To further explore optical transceivers, including specifications and standards, visit the following resources:
- Understanding SONET/SDH Networking
- Wavelength-Division Multiplexing (WDM) Explained
- Fiber Optic Connector Types and Standards
For more information about Carritech Optics and our 155M transceiver solutions, feel free to browse our Knowledge Centre or contact our team for expert advice.
By understanding the different types of 155M optical transceivers, network engineers and IT professionals can make informed decisions to optimize their network infrastructure, ensuring reliable and efficient communication.
Click here to view our 155M Duplex and 155M BIDI optical transceivers.
