Patent ID: 6178022
Filing Date: 2001-01-23
Classification: H04J

Abstract:
An optical transmitter for optical time-division multiplexing transmission where optical signals are intensity-modulated by data signals and then time-division-multiplexed to output an optical time-division-multiplexed signal, comprising:plural data signal sources of plural channels operatively connected to corresponding ones of plural optical signal outputting means for outputting optical signals;means for outputting a channel identification signal comprising a low-frequency signal with a natural frequency proper to each of the optical signals;means for superposing the channel identification signal comprising the low-frequency signal with the natural frequency proper to each of the plural channels to be multiplexed on each of said optical signals corresponding to said each of plural channels by conducting a small quantity of intensity modulation to output a channel frequently multiplexed optical signal; andmeans for optical time division multiplexing said frequency multiplexed optical signal to output an optically time division multiplexed signal.