Abstract

We proposed a novel scheme to generate polarization-insensitive optical millimeter-wave (mm-wave) wavelength-division-multiplexing (WDM) signals by using an external modulator and a semi conductor optical amplifier (SOA). In the scheme, two copolarized pumps and a WDM signal are mixed in the SOA based on four wave mixing (FWM), and the quadruple frequency mm-wave signal, similar to the single-sideband mm-wave signal, is obtained by using an optical filter to remove one sideband after FWM. Based on the scheme, we have experimentally demonstrated the generation of a two- channel $2.5\mathrm{Gb}\mathrm{i}\mathrm{t}\mathrm{/}\mathrm{s}$ WDM optical mm-wave signal with a repetitive frequency up to $40\mathrm{GHz}$ by a $10\mathrm{GHz}$ local oscillator, and the downstream signal delivery over a $20\mathrm{km}$ fiber with power penalty less than $1\mathrm{dB}$.

© 2009 Optical Society of America

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