Optical repeater using two mode-locked laser diodes for regenerating output pulses of same wavelength as incident optical pulses

An optical repeater comprising:

• an optical splitter for splitting an optical input data pulse stream of first wavelength into first and second components;
• a first mode-locked laser diode connected to receive the first component of the optical data pulse stream from the optical splitter for producing therefrom a first clock pulse stream of second wavelength different from said first wavelength, the first clock pulse stream being synchronized to the optical input data pulse stream;
• a second mode-locked laser diode connected to receive the first clock pulse from the first mode-lock laser diode for producing therefrom a second clock pulse stream of wavelength equal to said first wavelength, the second clock pulse stream being synchronized to the first clock pulse stream;
• a light amplifier for amplifying the second component of the optical input data pulse stream from the optical splitter;
• and
• an optical modulating device for modulating said second clock pulse stream with the amplified data pulse stream.