RFWavelength Blocker: Basics and Function in Fiber Optics
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This page explains the basics of a Wavelength Blocker, a crucial component used in fiber optic networks. We’ll delve into its function, particularly within Reconfigurable Optical Add-Drop Multiplexers (ROADMs).
The image above illustrates a Wavelength Blocker (WB) ROADM. Let’s explore the key features of this type of ROADM:
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Dynamic Channel Equalization: It functions as a dynamic channel equalizer, ensuring signal strength consistency across different wavelengths.
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ON/OFF Switch Functionality: The maximum attenuation setting provides a complete cutoff functionality, effectively acting as an ON/OFF switch for specific wavelengths.
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‘Broadcast and Select’ Architecture: It utilizes a ‘broadcast and select’ architecture, allowing any input wavelength to be routed to any output.
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Long Haul Network Applications: It’s primarily used in long-haul fiber optic networks where signal degradation is a significant concern.
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Channel Capacity: Typically handles around 80 channels with a spacing of approximately 50GHz between them.
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Colored Ports: The ports are ‘colored,’ meaning they are designed for specific wavelengths.
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Cost and Functionality: It tends to be expensive compared to other ROADM types, especially considering the limited functionalities offered.
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Legacy Systems: Commonly found in older fiber optic systems.
