Abstract
A new optical millimeter-wave generation scheme to double the beating
frequency without suppressing the carrier by taking advantages of the
out-of-phase property between sidebands of a phase-modulated optical carrier
is proposed for the first time. Theoretical analysis shows that the
generated 60 GHz optical millimeter-wave (mm-wave) can tolerant ${\pm}0.016$ nm wavelength drifting with filter bandwidth ranging from 70 to
100 GHz to sustain first to second harmonic suppression ratio of 18 dB. The
doubled frequency is continuously tunable from 60 to 90 GHz within 100 GHz
filter bandwidth with RF power variation of less than 2 dB. In addition,
simultaneously generating and transmitting multi-band signal:
millimeter-wave band, microwave band, and baseband leveraging the same
concept is also proposed. Error-free transmission of 2.5 Gb/s wireless
baseband signals carried by the generated 60 GHz mm-wave is successfully
demonstrated in both single- and multi-band network environments over a
combined optical fiber and wireless distance with a proper equivalent
isotropically radiated power of about 20 dBm for in-building access.
Moreover, dispersion effect on the generated frequency-doubled optical
mm-wave is analyzed by experimentally comparing the link performance of both
single mode fiber (SMF-28) and dispersion-shifted fiber cases. It is
concluded that for single-band service delivery, the proposed scheme is
immune to the interference from the dispersion-induced, redundant 1st
harmonics; however, to deliver multi-band services, launching lightwave at
zero-dispersion wavelength over SMF-28 is highly recommended to mitigate
inter-band interference.
© 2010 IEEE
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