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Pulse amplitude position modulation system based on amplitude reduction type probability shaping

A technology of pulse amplitude and modulation system, applied in the field of optical transmission, can solve the problem of increasing misjudgment, and achieve the effect of reducing transmission power, improving processing efficiency and efficient transmission

Active Publication Date: 2020-04-21
NANJING UNIV OF INFORMATION SCI & TECH
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  • Application Information

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Problems solved by technology

In APPM modulation, increasing the number of amplitude levels can effectively improve the spectral efficiency of the system, but too many amplitude levels will greatly increase the probability of misjudgment between amplitude levels

Method used

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  • Pulse amplitude position modulation system based on amplitude reduction type probability shaping
  • Pulse amplitude position modulation system based on amplitude reduction type probability shaping
  • Pulse amplitude position modulation system based on amplitude reduction type probability shaping

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Embodiment Construction

[0037] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as Figure 4 As shown, a pulse amplitude position modulation system based on the amplitude-decreasing probability shaping of the present invention includes a transmitting end and a receiving end;

[0039] The transmitting end includes a reduced-amplitude probability shaping unit, a position mapping unit, a Mach-Zehnder modulator, an optical attenuator and a single-mode fiber;

[0040] The receiving end includes a pre-amplifier, an optical band-pass filter, a photodetector, a low-pass filter, a position demapping unit and an amplitude decompression unit;

[0041]In the embodiment, at the transmitting end of the system, after the binary data stream signal is processed by the amplitude-decreasing probability shaping unit and the position mapping unit, a 4×16 APPM pulse signal is output, and the amplitude of the output pulse signal is ...

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Abstract

The invention discloses a pulse amplitude position modulation system based on amplitude reduction type probability forming. In a transmitting terminal of a system, a binary data flow signal is processed by a amplitude reduction type probability forming unit and a position mapping unit, and then a PS-4 * 16APPM pulse signal is output. An Mach-Zehnder modulator modulates a generated pulse signal tothe wavelength of 1550 nm, and after power control of the optical attenuator, the optical signal is sent to the single-mode optical fiber to be transmitted to the receiving end of the system. According to the invention, the traditional APPM is combined with the probability forming technology, the introduction of probability forming changes the distribution characteristic of the original pulse amplitude, and the characteristic is transmitted in the mapping process, so that the finally mapped signal is the APPM signal with amplitude compression. The system is suitable for an optical modulation and demodulation system for direct detection, does not need to use a coherent receiver, and can effectively reduce the complexity of the system, thereby improving the processing efficiency.

Description

technical field [0001] The invention belongs to the technical field of optical transmission, and in particular relates to a pulse amplitude position modulation system based on a drop-amplitude probability shaping. Background technique [0002] As social networks, streaming media, and online games have profoundly changed people's lives, Internet data traffic has begun to grow. According to Cisco's analysis, the global network protocol communication capacity is growing at a compound annual growth rate of 23% from 2014 to 2019 increase. According to IEEE, the network needs to support the average demand for bandwidth increasing at a rate of 58% per year. The deployment of cloud computing has accelerated the business's demand for network bandwidth. People urgently need high-speed, low-cost, and short-distance interfaces to meet the continuous growth of data center bandwidth. The continuous exchange of massive data, more powerful data centers, and higher network bandwidth are th...

Claims

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Application Information

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IPC IPC(8): H04B10/50H04B10/516H04B10/524H04B10/54H04B10/66
CPCH04B10/501H04B10/516H04B10/524H04B10/541H04B10/66
Inventor 刘博张丽佳毛雅亚张靖怡忻向军孙婷婷赵立龙吴泳锋刘少鹏宋真真王俊锋哈特
Owner NANJING UNIV OF INFORMATION SCI & TECH
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