For the hybrid transmission system with dispersion compensation, the requirements for the optical power entering the fiber should be consistent with the requirements of the original non-coherent system.

The dispersion coefficient is the time delay difference caused by the optical wavelength signal passing through the unit length of optical fiber in the unit wavelength interval, so which of the following is the unit of the dispersion coefficient?

Please drag the correct answer to the number in the picture.

The instrument test method is generally used to eliminate external problems of transmission equipment and docking problems with other equipment.

For a 9-dimensional site, to realize the Colored&Directionless scene, how many boards do you need to configure at least if all WSMD9 boards are used?