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Two-way wired/wireless hybrid optical access method and system based on homodyne/heterodyne detection

A wireless access and heterodyne detection technology, applied in the directions of optical fiber radio, optical fiber transmission, etc., can solve the problems such as the inability of users to flexibly change the receiving method, the low utilization rate of equipment and spectrum, and the reduction of signal transmission performance in the optical fiber.

Inactive Publication Date: 2013-11-27
BEIJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

[0004] At present, there have been many 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 still has at least the following problems: it only carries wired and wireless data The spectrum of the optical signal of the information is simply merged and superimposed. In the base station, the wired and wireless receiving signals are independent of each other, which increases the spectral components and is greatly affected by factors such as optical fiber dispersion, thereby reducing the transmission performance of the signal in the optical fiber. The transmission distance, the utilization rate of equipment and spectrum is low, and the user cannot flexibly change the receiving method

Method used

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  • Two-way wired/wireless hybrid optical access method and system based on homodyne/heterodyne detection
  • Two-way wired/wireless hybrid optical access method and system based on homodyne/heterodyne detection
  • Two-way wired/wireless hybrid optical access method and system based on homodyne/heterodyne detection

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Embodiment Construction

[0039] The present invention provides a full-duplex access method, which is used to realize the wired / wireless selective access of hybrid ONU based on homodyne / heterodyne detection, and complete the wired / wireless access optical signal between the central station and the hybrid ONU. Transmission, increase the flexibility of hybrid ONU access methods, realize high-speed data transmission and reception, and improve spectrum utilization. In order to achieve the above effects, the following steps need to be taken:

[0040] First, in the downlink transmitting module: as figure 1 As shown, at the central station, the angular frequency is ω 0 =2πf 0 The narrow-linewidth laser output light waves are injected into a two-electrode lithium niobate Mach-Zehnder modulator (LiNbO 3 Mach-Zehnder modulator, LN-MZM), here at the laser frequency f 0 =193.1THz (1552.5nm), the line width is 100kHz as an example, its spectrum is as figure 2 shown. For intensity modulation signals, a simple l...

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Abstract

The invention discloses a two-way wired / wireless hybrid optical access method and system based on homodyne / heterodyne detection. The two-way wired / wireless hybrid optical access method includes the steps of modulating a digital signal base band on an optical carrier through an I / Q modulator in a junction center, transmitting the digital signal base band to a mixed ONU through a downlink transmission link, providing coherent light vibration of homodyne reception and heterodyne reception by using a tunable laser in the mixed ONU, using the vibration source as the optical carriers of uplink wired / wireless data signals, carrying the wired access uplink signals and the wireless access uplink signals through a base band I / Q modulation method and a single side band modulation method respectively, using the laser as the vibration source in the junction center to carry out coherent reception, and finishing the full-duplex transmissions of the wired / wireless access signals between the junction center and the mixed ONU and the photovoltaic conversion of the wired / wireless access signals based on the homodyne / heterodyne detection. The two-way wired / wireless optical access method enables the flexible selection of mixed ONU access methods to be increased and achieves high-rate data transmission, sending and receiving, and the spectrum efficiency is high.

Description

technical field [0001] The present invention relates to the field of optical communication and millimeter wave communication, in particular to using optical fiber to transmit wired / wireless access baseband optical signals carrying high-speed data, and using optical local oscillators of different frequencies to realize full-duplex wired and wireless communication through homodyne / heterodyne detection. Millimeter wave wireless can choose hybrid optical access. Background technique [0002] With the in-depth development of human society's informatization, people's demand for multiple services such as high-speed and high-quality voice, data and images is becoming more and more urgent. The emergence of new multimedia services such as conference TV, video on demand and online games has made wireless and The demand for communication capacity of the wired access network is increasing rapidly, and low-speed narrowband communication is becoming more and more difficult to meet the data...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25H04B10/2575
Inventor 马健新张瑞姣张俊杰李艳杰王照
Owner BEIJING UNIV OF POSTS & TELECOMM
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