Abstract
A high frequency (33 GHz) optical pulse train from a monolithic mode-locked semiconductor laser at λ = 1554 nm was modulated by pulses from a low repetition rate (1 GHz) gain-switched distributed feedback laser (DFB) at a different wavelength λ = 1542 nm by using a nonlinear optical loop mirror (NOLM). This technique provides a scheme of optical coding of a high repetition rate optical pulse source and can simultaneously perform N × 1 multi-wavelength conversion.
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