System and methods for fiber and wireless integration
AssigneeZte Corporation
InventorJianjun Yu
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Abstract
Embodiments of the present invention pertain to optical wireless architecture and, in particular, to novel optical architecture to provide fiber-optic and wireless communication systems, links, and access networks. Certain embodiments of the invention pertain to a novel method and apparatus to provide 109.6 Gb/s capacity over spans of 80-km SMF and 2×2 MIMO. Conversion of PM-QAM modulated wireless mm-wave signal to an optical signal as well as 80-km fiber transmission of the converted optical signal is also realized.
Claims10
A fiber-wireless transmitting system comprising:
- a transmitter central office, wherein a first lightwave is (i) externally modulated by transmitter data, and (ii) polarization multiplexed, to generate a PM-QAM modulated optical baseband signal;
- and
- a transmitter base station, wherein, after fiber transmission from the transmitter central office, the PM-QAM modulated optical baseband signal is (i) heterodyne beating with a second lightwave, and (ii) up-converted to a PM-QAM modulated wireless signal.
A fiber-wireless receiving system comprising:
- a receiver base station, wherein a received PM-QAM modulated wireless signal externally modulates a lightwave to generate an E-field modulated signal at an optical carrier suppression point, and wherein a sideband of the E-field modulated signal and an optical carrier is filtered out by a tunable optical filter resulting in an equivalent PM-QAM modulated optical baseband signal;
- and
- a receiver central office, wherein, after fiber transmission from the receiver base station, transmitter data is recovered from the equivalent PM-QAM modulated optical baseband signal by homodyne coherent detection and baseband digital signal processing.
A fiber-wireless method comprising:
- polarization multiplexing an externally modulated first lightwave to generate a PM-QAM modulated optical baseband signal;
- fiber transmitting the PM-QAM modulated optical baseband signal;
- and
- heterodyne beating with a second lightwave and up-converting the PM-QAM modulated optical baseband signal to a PM-QAM modulated wireless signal.
A fiber-wireless method comprising:
- receiving a PM-QAM modulated wireless signal;
- externally modulating a lightwave by the PM-QAM modulated wireless signal to generate an E-field modulated signal at an optical carrier suppression point;
- filtering out a sideband of the E-field modulated signal and an optical carrier resulting in an equivalent PM-QAM modulated optical baseband signal;
- fiber transmitting the equivalent PM-QAM modulated optical baseband signal;
- and
- recovering transmitter data from the equivalent PM-QAM modulated optical baseband signal by homodyne coherent detection and baseband digital signal processing.
Dependencies are inferred from the claim text.