WDM (Wavelength Division Multiplexing) is a method of combining multiple optical signals onto one fiber strand by assigning each signal a unique wavelength. These wavelengths act like separate channels, allowing parallel transmission of data without interference. This dramatically increases the capacity of fiber networks without laying additional fiber.

Each signal is generated by a laser or LED tuned to a specific wavelength. At the receiving end, a demultiplexer separates the combined signals back into individual data streams.

🔧 Key Components

• Multiplexer (MUX): Combines multiple wavelengths into one fiber.
• Demultiplexer (DEMUX): Splits the combined signal back into individual wavelengths.
• Optical Transceivers: Emit and receive light at specific wavelengths.
• Optical Filters: Used to isolate or combine wavelengths.

Benefits

• Scalability: Add more channels without new fiber.
• Efficiency: Maximizes fiber utilization.
• Cost savings: Reduces infrastructure expansion.
• Flexibility: Supports multiple protocols (Ethernet, SONET, etc.).

🏢 Applications

• Data center interconnects
• Metro and long-haul telecom networks
• Enterprise backbone links
• Cloud and content delivery networks

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