Method and device for realizing passive ONU (optical network unit) in multi-user OFDM-PON (orthogonal frequency division multiplexing-passive optical network)
An OFDM-PON, multi-user technology, applied in multiplexing system selection device, selection device, multi-frequency code system, etc., can solve the problem of single frequency of radio frequency source, interference, inability to apply to multi-user OFDM-PON system, etc. problems, to achieve the effect of reducing costs
Inactive Publication Date: 2015-01-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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However, for a multi-user OFDM-PON system such as an OFDM-PON system with the number of access users greater than or equal to 64, the frequency of the radio frequency source generated by each ONU is single, so the uplink signals generated by multiple ONUs will cause serious problems during transmission. interference, thereby greatly reducing the performance of the system, so this method can only be used for OFDM-PON systems with a small number of users, but not for multi-user OFDM-PON systems
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[0046] figure 1 It is a schematic diagram of a specific implementation of an OFDM-PON with passive ONU optical and electrical domains of the present invention;
[0047] Such as figure 1 As shown, in order to thoroughly realize the passive characteristics of the ONU in the OFDM-PON system, thereby further reducing the cost of the entire OFDM-PON system, the present invention proposes an OFDM-PON device using an optical comb generator to realize the ONU optical domain Passive at the same time as the electric domain.
[0048] Such as figure 1 As shown, at the optical line terminal OLT, an optical comb generator is driven by a radio frequency source with a frequency of fc to generate an optical comb signal containing 2n optical carriers and a frequency interval between adjacent optical carriers of fc.
[0049] Using an optical circulator L1 and a narrow-band FBG reflective filter, the comb signal containing 2n optical carriers and the adjacent optical carrier frequency interval is fc is ...
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The invention discloses a method and a device for realizing a passive ONU (optical network unit) in a multi-user OFDM-PON (orthogonal frequency division multiplexing-passive optical network). 2n optical carriers are produced by utilizing an optical comb generator at an optical line terminal (OLT), thus (2n-2) pure radio source signals at different radio frequencies are produced by virtue of a beat frequency at the ONU to help each ONU to carry out up and down frequency conversion process, and each ONU obtains the pure radio source signals at different radio frequencies, so as to realize that (2n-2) different ONUs have no radio source; meanwhile, a concentrated light source technology and an optical filtering separation technology are combined to realize that each ONU has no light source, thus the ONU is thoroughly passive, namely the ONU is passive in an optical domain and an electrical domain, cost of the ONU is greatly reduced while an uplink signal is effectively transmitted, and further cost of a multi-user OFDM-PON system is reduced.
Description
Technical field [0001] The present invention belongs to the field of optical communication technology, and more specifically, relates to a method and device for implementing ONU passive by using an optical comb generator in a multi-user OFDM-PON. Background technique [0002] OFDM-PON (Orthogonal Frequency Division Multiplexing-Passive Optical Network, namely Orthogonal Frequency Division Multiplexing-Passive Optical Network) combines the respective characteristics of OFDM technology and PON system, and transmits OFDM signals in optical fiber systems with high spectrum utilization and strong The combination of anti-dispersion performance and the large-capacity and low-cost characteristics of the PON system makes the OFDM-PON system an important research topic in the field of optical communications. In recent years, research teams from major research institutions and universities have conducted a lot of research work on the low cost, which is one of the most significant features o...
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IPC IPC(8): H04L27/26H04Q11/00
Inventor 张崇富陈晨冯元
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA