In the field of modern optical fiber communication, wavelength division multiplexing (WDM) technology stands out as an advanced innovation. It effectively transmits data by converging multiple optical signals of different wavelengths and rates into one optical fiber.
A wavelength division multiplexing system usually consists of four main components: the optical transmitter, the optical relay amplifier, an optical receiver and an optical monitoring channel. Among them, the MUX and DEMUX devices are the key components, and they play a vital role in the WDM system.
Optical transmitter
For generating optical signals of specific wavelengths. Each channel corresponds to an optical transmitter, which consists of a laser and a modulator. The laser generates an optical carrier, and the modulator modulates the optical carrier according to the input electrical signal.
Multiplexer (Mux)
Merges different wavelength signals from multiple optical transmitters into one optical fiber. Multiplexers are usually implemented by optical filters or arrayed waveguide gratings (AWG).
Optical fiber
As a transmission medium, optical fiber shows low loss and excellent transmission performance in the relevant wavelength spectrum.
Optical relay amplifier:
It is used to amplify the signal that has attenuated on the way. In long-distance transmission, due to signal attenuation, the signal needs to be amplified periodically to maintain its strength. Common amplifier is Erbium-Doped Fiber Amplifier (EDFA).
Demultiplexer (DeMux)
At the receiving end, the demultiplexer separates the combined signal into each original wavelength and guides them to the corresponding optical receiver. The working principle of the demultiplexer is similar to that of the multiplexer, but the process is reversed.
Optical receiver
Converts the optical signal received from the demultiplexer back to an electrical signal. The optical receiver includes a photodetector and an electrical signal recovery device.
Optical monitoring channel
Used for system management and performance monitoring, it can monitor the system status in real time to ensure the communication quality.
Network management system
For the configuration, management and troubleshooting of the entire WDM system.
Since the optical fiber is made of glass, why should it be protected from water?
2024-07-02
When the optical cable is laid, there are two protection requirements for the fiber: less stress and waterproof.
Usually there are 4 waterproof barriers: Outer...
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