Destructively Interfered Beating Dual-Mode VCSEL for Carrierless MMW Fiber-Wireless Access Link With Suppressed RF Fading

Long-reach fiber-wireless access link using a dual-mode vertical-cavity surface-emitting laser (DM-VCSEL) is established for carrierless millimeter-wave (MMW) transmission with suppressed RF fading. By destructively interfered beating the orthogonally polarized dual carrier from the DM-VCSEL, the remotely beat MMW central carrier suppresses its central peak power up to 33 dB, which ensure more gain for the carried quadrature-amplitude modulation orthogonal frequency-division multiplexing (QAM-OFDM) data during electrical amplification to lengthen the distance of wireless link. With suppressing the MMW central carrier and mitigating the RF fading by destructively interfered beating and optical single-carrier modulation of the DM-VCSEL, the received optical signal-to-noise ratio as high as 18.1 dB is determined after fiber transmission. Such a long-reach 38-GHz carrierless MMW over fiber system enables 12-Gb/s 16-QAM OFDM data transmission over 50 km in single-mode fiber and 4 m in free space. After the proposed fiber-wireless access, the single-carrier modulated QAM-OFDM data certifies to pass the forward error correction criterion with an error vector magnitude of 17.2% and a bit error rate of 3.6 × 10
^-3
.