| 摘要 |
An optical transmission system comprises a plurality of mode-locked diode lasers each providing an output pulse at a different respective sub-carrier frequency and means for modulating each sub-carrier in response to respective input signals for providing a plurality of optical signals for transmission. A reference sub-carrier having a frequency such that the intervals between the reference sub-carrier frequency and each of the respective signal carrying sub-carrier channel frequencies are distinguishable from the intervals between respective signal carrying sub-carrier channels can be employed. Laser sources comprising a short wavelength mode locked laser source coupled to a waveguide second harmonic generator or bulk crystal, and a driver laser which provides seed pulses to a passively mode locked laser at its resonance frequency are described. <IMAGE>
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