a hybrid wdm - tdm optical link employing a hybrid modelocked multi - wavelength semiconductor which provides approximately 4 to approximately 20 wavelength channels that makes possible modulated multiplexed data which when demultiplexed by ultra fast optical demultiplexing provides rates suitable for conventional electronic photo receivers . the link uses single - stripe gaas / algaas semiconductor optical amplifiers which simultaneously generate from approximately four to more than approximately twenty tunable wdm channels . diode laser can also include inp , ingaalp , ingaasp , ingap , ingaas . a four channel version transmits approximately 12 picosecond pulses at approximately 2 . 5 ghz for an aggregate pulse rate of 100 ghz . when generating approximately 20 wavelength channels , each transmitting approximately 12 picosecond pulses at a rate of approximately 600 mhz , there is provided optical data and transmission systems operating at rates in excess of 800 gbits / s .