The so-called dense is relative to the interval between two adjacent wavelengths. In the past, the wavelength interval of the wavelength division multiplexing system was several tens of nanometers. Now the wavelength interval is only 02 to 1.2 nm. The spectrum allocation is shown in Figure 2-1. DWDM technology is actually a specific form of wavelength division multiplexing. Generally, the wavelength division multiplexing system refers to the dense wavelength division multiplexing system.

There are many kinds of equipment used in the optical wavelength division multiplexing transmission system, and the realization method of each equipment module is different. In practical application, the selection of equipment should be selected according to the actual situation and the focus of system performance. In general, DWDM system has 5 basic parts: optical transmitter/receiver, wavelength division multiplexer, optical amplifier, optical monitoring channel and optical fiber.

The nonlinear effect of optical fiber is a major factor affecting the performance of DWDM system, which is inseparable from factors such as optical power density, channel spacing and optical fiber dispersion; the nonlinear effect of optical fiber is positively related to optical power density and negatively related to channel spacing; However, the relationship between the dispersion of the fiber and the nonlinear effect of the fiber is more complicated. With the development of DWDM technology, the number of channels that can be transmitted by optical fibers has increased sharply, the spacing between channels has become more dense, and the transmission power has also increased. increasingly prominent.

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