Full-duplex wired/wireless hybrid access method and system based on passive optical network (PON)/RoF

Abstract

The invention discloses a full-duplex wired / wireless hybrid access method and system based on a passive optical network (PON) / RoF. A radio frequency local oscillator modulates optical waves to generate sidebands through an optical modulator, one path of sideband polarization is separated to form an orthogonal branch B1 and an orthogonal branch B2, the other path of sideband polarization is separated to form an orthogonal branch B3 and an orthogonal branch B4, the B1 is used for a downlink data signal, the polarization of the B3 is adjusted to be parallel to that of the B1, the B1, B2 and B3 are coupled to generate fused optical signals, the fused optical signals are transmitted to a base station through optical fibers; and the B4 is reserved into an optical local oscillator for demodulating an uplink signal. A wireless access scheme of the base station is that quadruple optical millimeter waves and uplink carrier B2 are separated through a polarization beam splitter, and a wired access scheme of the base station is that common-frequency branches B1 and B2 and uplink carrier B3 are separated through a wavelength interleaved optical filter, and coherent demodulation of the branches B1 and B2 is realized. The reserved uplink optical carriers respectively can be used for bearing uplink wired or wireless signals, the uplink wired or wireless signals are transmitted to a central station and are demodulated through the optical fibers, and a full-duplex RoF link is finished.

Description

technical field [0001] The present invention relates to the field of optical communication and millimeter wave communication, and in particular to the use of optical communication technology to transmit long-distance wired and wireless fusion optical signals based on orthogonal polarization, so as to realize full-duplex wired / wireless hybrid access based on the fusion of PON and RoF technology methods and systems. Background technique [0002] With the development of communication, low-speed narrowband communication is becoming more and more difficult to meet the data rate and bandwidth requirements of data, voice, video and multimedia. The development of optical fiber communication has become a feasible solution for long-distance and high-speed signal transmission due to its advantages of low loss, large bandwidth, immunity to electromagnetic interference and easy maintenance. [0003] Passive Optical Network (PON) based on optical fiber access is a high-quality and low-co...

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Problems solved by technology

[0005] At present, there have been literature reports on hybrid wired / wireless access based on PON / RoF, but the hybrid wired / wireless access method of PON / RoF in the prior art has at least the following problems: it only simply couples and transmits wired and wireless signals , the wired and wireless receiving signals are independent of each other, which increases the spectrum component, reduces the transmission performance of the signal in the optical fiber, and the utilization rate of equipment and spectrum is far from enough

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