Introduction - What Is BiDi Optical Transceiver？
BiDi optical modules, also known as bidirectional optical modules, usually consist of two different wavelengths and can achieve transmission in two directions on one optical fiber (single-mode or multi-mode). Unlike ordinary optical modules with two ports, BiDi optical modules have only one port. BiDi allows duplex signals to be transmitted over a single fiber, allowing for more efficient networking and cabling. To achieve this, bidirectional transceivers must operate on two different wavelengths.
BiDi transceivers use wavelength division multiplexing (WDM) technology to send and receive signals in two directions with different center wavelengths. The most common wavelengths of BiDi optical modules are 1310nm/1550nm, 1310nm/1490nm, and 1510nm/1590nm. It is easy to distinguish BiDi transceivers from ordinary transceivers from the picture below.
BiDi transceivers have become synonymous with reliable and high-performance networks, enabling bidirectional fiber optic communications by operating on a single fiber. Understanding the role of BiDi optical modules requires recognizing their importance in facilitating simplified connections. Unlike traditional optical modules that use separate optical fibers to transmit and receive data, BiDi modules complete this bidirectional data transmission on a single optical fiber, optimizing space utilization and paving the way for improved network efficiency.
How Does BiDi Works
Before delving further into the importance of fiber selection, it is necessary to understand how BiDi optical transceivers work. Traditional fiber optic modules use separate optical fibers to transmit and receive data. In contrast, BiDi can use a single fiber to perform both functions, assigning different wavelengths to upstream and downstream data. This enables more efficient use of available fiber resources and increases network capacity.
BiDi transceivers are equipped with a WDM coupler, which combines and separates the data transmitted over a single fiber based on the wavelength of light. The technology is formally known as wavelength division multiplexing (WDM) and is standardized according to the SFP multi-source agreement (MSA). This standardization allows you to purchase equipment with a certain level of compatibility and functionality. Just look for MSA compliance so you know your hardware is up to the task.
It's important to note that bidirectional SFPs have the same advantages and disadvantages as unidirectional SFPs. That is, fiber is great for long distances and medium speeds, but not ideal for the fastest speeds.
Specifically, the BiDi network can support speeds up to 10G over a distance of 80 kilometers. Alternatively, it can support 25G speeds over distances up to 10 kilometers. The QSFP+ setup can reach speeds of up to 40G, but only over a distance of about 150 meters.
With these pros and cons in mind, BiDi is great for saving cabling and improving communication efficiency when you need to run very long cables at moderate speeds. This includes application scenarios such as CCTV, MANs and 5G deployments.As shown in the figure below, we installed a BiDi transceiver at point A to transmit TX at 1310nm wavelength to point B through a single fiber. At point B, there is a transceiver that receives the RX at a wavelength of 1310nm and sends it on the same fiber at a wavelength of 1550nm to point A, and then at point A, the RX frequency is 1550nm. BiDi transceiver A transmits 1310nm wavelength signals and receives 1550nm wavelength signals. BiDi transceiver B, on the other hand, transmits a 1550nm wavelength signal and accordingly receives a 1310nm wavelength signal. This is why BiDi transceivers must be used in pairs.
The Type Of Bidi Transceiver Provided By Sanopti
The BIDI transceiver has a variety of different rates, range and wavelengths.
The following is Snaopti provided BIDI optical transceiver:
1.25G SFP BIDI Optical Transceiver 20KM SC
Data rate: 1.25Gbps
Wavelength: 1550nm TX/1310nm RX
Media type: Single-Mode Fiber
Distance: 20KM
10G SFP+ BIDI Optical Transceiver 20KM
Data rate: 10Gbps
Wavelength: 1330nm TX/1270nm RX
Media type: Single-Mode Fiber
Distance: 20KM
25G SFP28 BIDI 10KM
Data rate: 10Gbps
Wavelength: 1330nm TX/1270nm RX
Media type: Single-Mode Fiber
Distance:10KM
Advantages Of BIDI Optical Transceive
Single fiber interface
Simplify communications with bi-directional data transmission over a single fiber
Minimizes cable tangles, simplifies network setup, and improves efficiency
Enables fast data transfer rates for improved operational efficiency
Hot Plug SFP
Facilitates seamless transceiver integration to avoid system downtime
Supports multiple data rates and interfaces to ensure seamless integration
Conforms to industry-standardized physical dimensions and electrical interfaces
Compatibility
Compatible with a wide range of network devices, including media converters
Facilitates easy upgrades and instant additions to ensure uninterrupted network functionality
Improves the efficiency of data communication networks and simplifies operational procedures
Factors To Consider When Selecting A BiDi Transceiver
Compatibility
Choosing the right module requires considering the unique requirements of each device, as modules cannot detect the environment in which they are used. Choosing compatible BiDi fiber optic cables and transceivers ensures reliable and efficient connectivity throughout your network.
Distance Requirement
Modules supporting up to 10 km may be sufficient for shorter connections up to 10 km. Longer distances between buildings or campuses may require modules rated for 60 km or 80 km.
Sanopti BIDI modules provide connectivity up to 120 kilometers.
Wavelength Options
Here are the wavelength options you can choose from:
1330nm/1270nm
1270nm/1330nm
1550nm/1490nm
1490nm/1550nm
Wavelength selection is based on factors such as distance requirements, existing fiber optic infrastructure, and compatibility with other network components. Ensure that the wavelength match between the transceivers at both ends of the fiber link is correct.
Environmental Considerations
Choose modules designed for the temperature, humidity, and electromagnetic interference (EMI) conditions of your deployment environment.
Single Fiber Or Double Fiber
Choosing the right BiDi fiber for a BiDi transceiver is not an easy task. Different types of BiDi optical modules require different types of optical cables.
Applications of BiDi Transceivers
Data Center
BiDi optical modules optimize data center connections, increasing data transfer rates and efficient space utilization.
Telecommunications
In telecommunications networks, BiDi technology enables cost-effective and high-performance data transmission over long distances.
5G Point-To-Point Optical Fiber Direct Drive Solution
BiDi optical modules have also been used in 5G fronthaul, especially 25G BiDi SFP28 optical modules. Sanopti currently provides point-to-point optical fiber direct drive solutions (single
Conclusion
In summary, BIDI optical transceivers reduce the need and cost of fiber optic infrastructure, and adopting BiDi optical modules and selecting appropriate fibers can significantly improve overall network performance. There are many key factors to consider when selecting a module, such as compatibility, distance, wavelength, environment and warranty. Sanopti offers a full range of high-performance, standards-compliant option BiDi transceivers, please feel free to contact us if you have any needs.
