C. Lim et al., Millimeter-wave broad-band fiber-wireless system incorporating baseband data transmission over fiber and remote LO delivery, J LIGHTW T, 18(10), 2000, pp. 1355-1363
We present the first demonstration of a millimeter-wave (mm-wave) broadband
fiber-wireless system which incorporates baseband data transmission in bot
h the downstream (622 Mb/s) and upstream (155 Mb/s) directions. The local o
scillator (LO) required at the remote antenna base station for up- and down
conversion to/from the mm-wave radio frequency (RF) is delivered remotely v
ia a modulation scheme that is tolerant to the effects of fiber chromatic d
ispersion on the detected LO carrier power. The technique employs a single
dual-electrode modulator located at the central office (CO) and the data an
d an RF signal at a frequency equal to half the LO frequency, are applied s
imultaneously to the device, The modulation scheme was optimized as a funct
ion of the modulator operating conditions. Simultaneous bidirectional radio
transmission in the mm-wave fiber-wireless network was implemented using s
pecially designed mm-wave diplexers located at the base station (BS) and cu
stomer unit, and a single Ka-band printed antenna array at the BS operating
simultaneously in transmit and receive mode. Error-free data transmission
was demonstrated for both down- (34.8 GHz) and uplinks (37.5 GHz) after 20
km of single-mode optical fiber and a bit error rate (BER) of 10(-6) was ac
hieved after the inclusion of a 2-m radio link.