Abstract
A directly modulated dual-mode laser diode (DMLD) with third-order intermodulation distortion (IMD3) suppression is proposed for a 60-GHz millimeter-wave over fiber (MMWoF) architecture, enabling new fiber-wireless communication access to cover 4-km single-mode-fiber (SMF) and 3-m wireless 16-QAM OFDM transmissions. By dual-mode injection-locking, the throughput degradation of the DMLD is mitigated with saturation effect to reduce its threshold, IMD3 power and relative intensity noise to 7.7 mA, −85 dBm and −110.4 dBc/Hz, respectively, providing huge spurious-free dynamic range of 85.8 dB/Hz2/3. This operation suppresses the noise floor of the DMLD carried QPSK-OFDM spectrum by 5 dB. The optical receiving power is optimized to restrict the power fading effect for improving the bit error rate to 1.9 × 10−3 and the receiving power penalty to 1.1 dB. Such DMLD based hybrid architecture for 60-GHz MMW fiber-wireless access can directly cover the current optical and wireless networks for next-generation indoor and short-reach mobile communications.
Highlights
Nowadays, the 60-GHz millimeter wave (MMW) carrier with high bandwidth availability and license-free features has comprehensively investigated to develop next-generation indoor wireless networks, which effectively releases the explosive data traffic with the use of carriers at ultra-high frequency (UHF) and super-high frequency (SHF) bands[1]
After implementing the dual-mode injection-locking with double-sideband master, such a colorless Fabry-Perot laser diode (FPLD) can deliver the 36-Gb/s 16-quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM) data over 25-km SMF and perform the MMW wireless transmission at 4 Gb/s27
For dual-mode operation, the adjacent dual longitudinal modes of a LD with 600-μm cavity length of and 2% front-facet reflectance is injection-locked by a dual-sideband modulated single-mode master with a central carrier suppression ratio (CCSR) of 15.5 dB
Summary
The 60-GHz millimeter wave (MMW) carrier with high bandwidth availability and license-free features has comprehensively investigated to develop next-generation indoor wireless networks, which effectively releases the explosive data traffic with the use of carriers at ultra-high frequency (UHF) and super-high frequency (SHF) bands[1]. By further using a dual-MZM consisted I/Q modulator, the double-sideband carriers can construct a 24-Gb/s data link over 40-km single-mode-fiber (SMF) and 1.5-m wireless transmissions[19]. After implementing the dual-mode injection-locking with double-sideband master, such a colorless FPLD can deliver the 36-Gb/s 16-QAM OFDM data over 25-km SMF and perform the MMW wireless transmission at 4 Gb/s27. With the use of a third-order intermodulation distortion (IMD3) suppressed dual-mode laser diode (DMLD), a 60-GHz MMW embedded fiber-wireless access architecture is demonstrated for delivering the 6-Gb/s 16-QAM OFDM data over 4-km SMF and 3-m wireless transmissions. By employing the 16-QAM OFDM data, the transmission performances including signal-to-noise ratio (SNR), error vector magnitude (EVM) and bit error rate (BER) are examined at different optical receiving powers after 60-GHz wireless transmission over 3 m on free space. The temperature related optical stability of the dual-mode injection-locked DMLD is discussed
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