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Fiber-optic millimeter-wave downlink system using 60 GHz-band external modulation

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4 Author(s)
T. Kuri ; Div. of Photonics Technol., Minist. of Posts & Telecommun., Tokyo, Japan ; K. Kitayama ; A. Stohr ; Y. Ogawa

In this paper, a fiber-optic millimeter-wave (mm-wave) downlink system using 60 GHz-band external modulation is investigated. We prepare the fiber-optic 60 GHz-band mm-wave downlink testbed. It consists of an optical modulation section with a mm-wave signal generator, an optical single sideband (SSB) filter, a standard single-mode fiber (SMF), an optical detection section with a 60 GHz-band radio transmitter and a 60 GHz-band radio receiver. To modulate the laser output with 60 GHz-band mm-wave signals directly, a specially designed electro-absorption modulator with high-efficiency at around 60 GHz is used. The use of this modulator makes the simpler system configuration possible. Using the downlink testbed, the 5 m-long free-space propagation of subcarrier multiplexed 156 Mb/s-DPSK 60 GHz-band mm-wave signals recovered by optical direct detection is successfully demonstrated. The transmission of the mm-wave signals over 85 km-long standard SMF is also successfully demonstrated, using an optical SSB filtering technique to overcome the fiber dispersion. The BER of 10-9 is achievable at the optical received power of -7.0 dBm

Published in:

Journal of Lightwave Technology  (Volume:17 ,  Issue: 5 )