WDM-PON wired/wireless selectable access system and method

A WDM-PON, access system technology, applied in the field of optical access network, can solve the problems of reducing signal transmission performance, insufficient utilization of equipment and spectrum, increasing spectrum components, etc.

Active Publication Date: 2013-12-18
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] At present, there have been literature reports on hybrid wired / wireless access based on WDM-PON-RoF, but the hybrid wired / wireless access method of WDM-PON-RoF in the prior art has at least the following problems: only wired and wireless signals Simple coupling and transmission, 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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  • WDM-PON wired/wireless selectable access system and method
  • WDM-PON wired/wireless selectable access system and method
  • WDM-PON wired/wireless selectable access system and method

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Embodiment Construction

[0099] The invention provides a WDM-PON-RoF wired / wireless selective access system and method based on SSB-OFDM. At the remote switching node, one optical OFDM signal and two optical carrier signals are coupled into one combined signal. According to different needs of users, the optical OFDM signal is selected to beat with one of the optical carriers to generate signals for wireless services and For the radio frequency OFDM signal of the wired service, the remaining optical carrier can be used to modulate the uplink signal.

[0100] like figure 1 Shown is a system schematic for this application example.

[0101] downlink:

[0102] First, at the OLT end, it includes 5 WDM subsystems for outputting SSB-OOFDM signals, a coupler for coupling the signals output by the 5 subsystems, and 5 lasers. The frequencies of light waves output by the five lasers are f o1 =193.100THz, f o2 =193.124THz, f o3 =193.148THz, f o4 =193.172THz, f o5 =193.196THz, the channel frequency interval...

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Abstract

The invention provides a WDM-PON-RoF wired/wireless selectable access system and method based on SSB-OFDM. In the WDM-PON wired/wireless selectable access system, an OLT enables N ways of 4QAM-OFDM radio frequency signal single side bands to be modulated on N different optical carriers, and the N ways of 4QAM-OFDM radio frequency signal single side bands are reused as down link signals. RN distributes one way of optical OFDM signals and two ways of optical carriers with different radio frequencies for each ONU. According to the different user demands, each ONU conducts beat frequency on the optical OFDM signals and one way of optical carriers with small/large frequency spaces with the optical OFDM signals, therefore, wired/wireless access is achieved, and the other way of optical carriers are used as a modulating light source of up-link signals. The WDM-PON wired/wireless selectable access system and method are used, selectable access of wired signals or 60 GHz frequency band wireless signals can be achieved, the purpose of being free of light sources of the ONUs is achieved, and the cost and the complexity of the ONUs are lowered. An SSB and OFDM modulating technology is used in the WDM-PON wired/wireless selectable access system, and the spectrum efficiency is improved.

Description

technical field [0001] The invention relates to optical access network technology, in particular to an SSB-OFDM-based WDM-PON-RoF wired / wireless optional access system and method. Background technique [0002] Mobility, wireless, digitization, and broadband are the development trends of today's information industry, and ultra-high speed and ultra-large capacity have become the main goals pursued by information transmission. With the deepening of social informatization, metropolitan Ethernet, IPTV, high-definition TV, mobile multimedia, video streaming and other new services are constantly emerging. Higher and higher. [0003] At present, the access network is mainly divided into a wired access network and a wireless access network. In the wired access technology, the wavelength division multiplexing passive optical network (WDM-PON) based on optical fiber access has protocol transparency, large capacity, long transmission distance, low cost and full service support. and o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03H04J14/02
Inventor 马健新王照郑国立张瑞姣李艳杰
Owner BEIJING UNIV OF POSTS & TELECOMM
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