Transmitter and a signal generator in optical transmission systems

摘要

The present invention provides an optical transmitter using a multiplexer which can maintain a timing margin between a clock and data as an operating reference at an optimal value when data transmission speed, or data rate to be handled is changed. A delay circuit is arranged in a clock path in the multiplexer. A trigger of an operating clock of a frequency divider and a trigger of a delayed flip-flop or a multiplexer block are inverted so that a data margin is in proportion to the data transmission speed. When the data transmission speed is changed, the multiplexer can optimize the timing margin of the delayed flip-flop or the multiplexer block by non-adjustment. The optical transmitter can be operated normally when the operating speed is changed widely.