In the Coarse Wavelength Division Multiplexing system, there are mainly two kinds of CWDM multiplexers/demultiplexers: dual-fiber bidirectional CWDM multiplexer/demultiplexer and single fiber ones.
Among them, the dual-fiber bidirectional one uses two optical fibers to transmit and receive optical signals, and the wavelength of the optical signals transmitted on the two optical fibers is the same, while the single-fiber one’s transmitter only uses one optical fiber to transmit and receive optical signals, so the transmitted optical signal and the received optical signal on the optical fiber must be transmitted at different wavelengths. The latter is usually used in fiber expansion applications with only one fiber.
The single-fiber bidirectional CWDM multiplexer/demultiplexer
Single-fiber bidirectional CWDM multiplexer/demultiplexer usually has only one line port (as shown above), but there are still some single-fiber bidirectional CWDM multiplexer/demultiplexers that still use duplex line ports, but only one interface is working For example, the FMU single fiber CWDM multiplexer/demultiplexer supplied by us in the figure below, although it is configured with a duplex line port, actually only one interface is working, and the other interface is marked as "N/A" means "unavailable":
The figure below is the working principle diagram of the single-fiber bidirectional CWDM
multiplexer/demultiplexer. In the figure, a total of 16 wavelengths are used to realize the transmission of 8 kinds of optical carrier signals on a single fiber. Among them, the wavelength of the transmitted optical signal at end A The wavelength of the received optical signal at the B end is the same, and the transmitted optical signal at the B end has the same wavelength as the received optical signal at the A end.
The picture comes from the Internet.
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