Orthogonal mode multiplexing transmission method based on three-dimensional pulse amplitude position modulation
A pulse amplitude, quadrature mode technology, applied in the field of optical communication, can solve problems such as low spectral efficiency, and achieve the effect of reducing system complexity and cost, reducing system complexity and cost, and eliminating overlap
Active Publication Date: 2021-01-26
NANJING UNIV OF INFORMATION SCI & TECH
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[0005] Purpose of the invention: In order to improve the problem of mode crosstalk in the traditional few-mode transmission system and the problem of low spectral efficiency in the traditional APPM modulation, the purpose of the invention is to provide an orthogonal mode multiplexing transmission method based on three-dimensional pulse amplitude position modulation, based on large-capacity , low-complexity, high-spectrum-efficiency transmission requirements and the mechanism of mode crosstalk, using an orthogonal mode multiplexing system based on three-dimensional pulse amplitude position modulation for transmission
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[0052]figure 1 Shown is the system flow chart of the present invention. The original data is subjected to three-dimensional APPM mapping to achieve multi-dimensional multiplexing of 3 APPM signals. At the same time, N laser sources obtain multiple orthogonal mode lights with different mode spot radii after SLM. Then, under the action of Mach-Zehnder modulator (MZM), the three-dimensional APPM signal that has passed through the digital-to-analog converter (ADC) is subjected to orthogonal mode multiplexing. The three-dimensional pulse amplitude position modulation is the core content of the present invention, such asfigure 2 As shown, the process can be divided into serial-to-parallel conversion, APPM mapping, up-sampling, filter and adder. The specific workflow of each module is:
[0053](1) Serial-to-parallel conversion unit
[0054]In order to perform multi-dimensional multiplexing, the input original data is divided into three data streams after serial-to-parallel conversion.
[0055](2) A...
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The invention discloses an orthogonal mode multiplexing transmission method based on three-dimensional pulse amplitude position modulation, which belongs to the field of optical transmission technology. After the input original data undergoes serial-to-parallel conversion by a serial-to-parallel conversion unit, the encoding mapping is completed in the APPM mapping unit. After encoding, After the signal passes through the up-sampling unit, it is orthogonally filtered by the filter unit, and the filtered signal is added by the adder unit to synthesize a three-dimensional APPM signal for orthogonal mode transmission; this method realizes the three-way APPM signal based on three sets of orthogonal filters. The multiplexing of Pulse Amplitude Modulation (APPM) signals, combined with the orthogonal mode multiplexing transmission method, further realizes a substantial doubling of transmission capacity, improves the problem of low spectrum efficiency of APPM, increases transmission capacity, and expands APPM to more Dimensionality provides a possibility; at the same time, the transmission scheme of orthogonal mode multiplexing eliminates the mode crosstalk in few-mode fibers, and does not require MIMO‑DSP processing at the receiving end, reducing system cost and realizing low-complexity large-capacity transmission .
Description
Technical field[0001]The invention belongs to the field of optical communication technology, and specifically relates to an orthogonal mode multiplexing transmission method based on three-dimensional pulse amplitude position modulation.Background technique[0002]With the acceleration of the informatization construction process, network users have increased sharply, and network traffic has shown explosive growth. According to the report, mobile data traffic will grow at a compound annual growth rate (CAGR) of 46% from 2017 to 2022, to 2022 Annually will reach 77.5 exabytes per month. In order to solve this problem, mode multiplexing technology based on few-mode fiber is an indispensable technical solution, because it uses different modes in the few-mode fiber as different spatial channels for data transmission, which doubles the transmission capacity. In the mode multiplexing system, although all orthogonal spatial modes and polarization modes in the few-mode fiber (FMF) are used as i...
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IPC IPC(8): H04J14/04H04B10/524
CPCH04B10/524H04J14/04
Inventor 刘博忻向军任建新毛雅亚张靖怡王瑞春沈磊李良川周锐王光全吴泳锋孙婷婷赵立龙
Owner NANJING UNIV OF INFORMATION SCI & TECH