Abstract
We propose and demonstrate a novel and cost-effective photonic
down-conversion scheme for millimeter wave (mm-wave) over fiber (MoF)
uplinks using an electro-absorption modulator (EAM) at a base station. Two
wavelengths with frequency difference of ${\rm f}_{\rm lo}$, used as dual wavelength, are incident to an EAM that is driven
by an mm-wave signal at ${\rm f}_{mm}$ to obtain optical subcarrier modulation. Due to four-wave mixing
(FWM), two new wavelengths are generated inside the EAM and used for the
optical carriers for the uplink. One of the generated two wavelengths and
one of two mm-wave signal subcarriers is separated by ${\rm f}_{mm}-{\rm f}_{\rm lo}$ in frequency, thus down-converted. Furthermore, down-conversion
with tunability of optical carrier to optical subcarrier power ratio can be
achieved by simply controlling the dual wavelength power into the EAM. We
experimentally investigate the efficiency of the FWM versus EAM reverse bias
voltage and input optical power. The performance of the proposed scheme for
down-conversion of a 30 GHz multiband (MB) orthogonal frequency division
multiplexing (OFDM) ultra-wideband (UWB) is also investigated in terms of
error vector magnitude (EVM) versus RF and LO modulation index, and received
optical power at the photodetector.
© 2010 IEEE
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