Adjacent Channel Beating With Recombined Dual-Mode Colorless FPLD for MMW-PON

By delivering a reference carrier through adjacent dense-wavelength-division-multiplexing (DWDM) channel to remotely beat with the downstream transmitted optical carrier, a full-duplex millimeter-wave DWDM passive-optical-network (MMW-DWDM-PON) is demonstrated to transmit 36-Gb/s data over 25-km single-mode fiber (SMF) and to remotely deliver a 28-GHz MMW carrier for wireless 6-Gb/s data transmission. Such a remotely recombined dual-mode beating scheme provides baseband 36-Gb/s data with corresponding bit error rate (BER) of 2.7 × 10
^-3
, which is better than the directly dual-mode injection-locked colorless Fabry-Perot laser diode (FPLD) does because of the less fiber chromatic dispersion during 25-km SMF transmission. In a hybrid 25-km SMF-wired and 1.6-m wireless link, it successfully transmits 4-Gb/s data to fit the forward error correcting criterion. By maintaining the free-space distance at 1.6 m, the allowable raw data rate for MMW wireless transmission can be increased up to 6 Gb/s with BER of 1.9 × 10
^-3
. For optical baseband upstream transmission, the 36-Gb/s data is also directly encoded onto the upstream colorless FPLD injection-locked by reusing the downstream pure carrier delivered through adjacent DWDM channel, and the received data reveals a BER of 2.9 × 10
^-3
.