Introduction to the differences between gray light Modules and color light Modules

      ⦁ Background
      We often hear about gray light module and color light module, what are the differences in their characteristics and applications? The following is a brief chat.
      ⦁ Wavelength window for optical communication
      The first window of 850nm, the second window of 1310nm, the third window of 1550nm and the fourth window of 1625nm are used for optical communication, as shown in the figure below:

Figure 1 Wavelength windows for optical communication and attenuation in optical fiber

      From the above figure, it can be seen that the wavelength for optical communication is mainly 850-1625nm, while the wavelength of light visible to the naked eye (red, orange, yellow, green, blue, blue and purple) is mainly distributed in the 780-380nm, so the gray and colored light module does not mean that the light module emits a gray or colored.
      ⦁ Definition and difference between gray and colored light modules
      Gray light module (Grey): the wavelength is fluctuating within a certain range, there is no specific standard wavelength, such as the customer side of the wavelength division equipment optical port, the corresponding interface is called gray light interface.
      Color light module (Color): wavelength fluctuations in a very small range near the center wavelength, can be connected to the combined wave device, with a standard wavelength, wavelength division system in the line veneer wavelength division side of the optical signal, the corresponding interface is called a color light interface.
      Color optical module according to the different wavelength density can be divided into CWDM (coarse wavelength division multiplexing) optical module and DWDM (dense wavelength division multiplexing) optical module, color optical module ride with the wavelength of the wave will be synthesized with different wavelengths of the optical signal all the way to transmission, greatly reducing the link cost.
      The following figure briefly describes the application scenarios of gray light and color light modules:

Figure 2 gray light and color light module application scenarios

      A brief summary of the differences between gray light and color light modules, the following table:

Table 1 gray light and color light module differences

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