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The output spectrum have been numerically analyzed in order to investigate the temperature characteristics of the all-optical add-drop multiplexer (ADM). It is shown that the center Bragg wavelength shifts by 0.0142237 nm when the temperature increases by 1degC in a range of -30 degC to 110 degC. An experiment was conducted to observe the output spectrum for the all-optical ADM. The experiment results were analyzed and compared to the results of the numerical analysis of the output spectrum of the all-optical ADM. The experiment results show that there is a shift of 0.0112666 nm when the temperature changes by 1 degC and output power is on the average -10 dBm.