Consider an EDFA with maximum 26 dB gain and maximum output power of 0 {13111. Please calculate the actual EDFA gains when 1, 2, 3 or 8 wavelength channels are multiplexed in WDM systems. Each channel input power is 0.001 mW. (Hint: when the output power is lower than the maximum output power, the EDFA is not saturated and the actual gain is the maximum gain; otherwise the actual gain is smaller than the maximum gain)