Abstract: A device for suppressing the transient effect of an optical fiber amplifier in a WDM system includes an input sensor which converts an input optical signal to an electrical signal; a transient effect suppresser for holding the electrical signal received from the input sensor for a predetermined time and for outputting the delayed signal in the form of pulses that are proportional to the variation of the number of channels; a voltage comparator for comparing the predetermined reference voltages with the amplitude of the pulses received from the transient effect suppresser and for outputting a trigger signal when the channel number is changed; a pump laser diode driver for supplying a driving voltage to a pump laser diode in response to the received pump indication signal; and, a controller for outputting the pump indication signal corresponding to the changed channel number in response to the trigger signal.

Abstract: A wavelength division multiplexed transmission system and a transmitting method using the same are provided. The wavelength division multiplexed transmission system includes a transmitting optical terminal station for transmitting a supervision channel, delaying a plurality of data channels by a predetermined time, and transmitting the delayed data channels, a plurality of wavelength division multiplexed optical amplifying portions for controlling amplification gain according to gain information included in the supervision channel and amplifying the delayed and incident data channels according to the controlled gain, and a receiving optical terminal station for receiving the supervision channel and the data channels output from the wavelength division multiplexed optical amplifying portion.

Abstract: A device for suppressing the transient effect of an optical fiber amplifier in a WDM system includes an input sensor which converts an input optical signal to an electrical signal; a transient effect suppresser for holding the electrical signal received from the input sensor for a predetermined time and for outputting the delayed signal in the form of pulses that are proportional to the variation of the number of channels; a voltage comparator for comparing the predetermined reference voltages with the amplitude of the pulses received from the transient effect suppresser and for outputting a trigger signal when the channel number is changed; a pump laser diode driver for supplying a driving voltage to a pump laser diode in response to the received pump indication signal; and, a controller for outputting the pump indication signal corresponding to the changed channel number in response to the trigger signal.

Abstract: A wavelength division multiplexed optical amplifier controlling system and method. The wavelength division multiplexed optical amplifier controlling system includes an optical exchange system for generating and interpreting a supervision channel optical signal, multiplexing the supervision channel and data channels including optical signals having different wavelengths, and transmitting and receiving the multiplexed channels. Optical amplifying stages located in a transmission path are connected to the optical exchange system for amplification with uniform gain over a wavelength range including the data channel optical signals, according to information on the supervision channel optical signal. State information concerning amplification are inserted into the supervision channel when the optical exchange system requests the state information.