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A design method of all-optical shaper for multi-level pulse-amplitude modulation signal

A pulse amplitude modulation and optical shaper technology, applied in optics, instruments, optical demodulation, etc., can solve difficult multi-level PAM signals, limit the transmission distance of multi-level PAM optical signals, and realize difficulties in all-optical shapers and other problems, to achieve the effect of extending the transmission distance and solving the problem of signal degradation

Inactive Publication Date: 2018-07-10
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

Compared with OOK optical signals, multi-level PAM optical signals are more sensitive to degradation factors such as fiber dispersion, ASE, and nonlinearity, which limits the transmission distance of multi-level PAM optical signals to a certain extent
At present, most all-optical shapers are designed for OOK optical signals, and their implementation schemes and corresponding design methods are difficult to directly apply to multi-level PAM signals.
In fact, it is much more difficult to implement an all-optical shaper for multi-level PAM signals, one of the reasons is the lack of a more general design method to guide

Method used

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  • A design method of all-optical shaper for multi-level pulse-amplitude modulation signal
  • A design method of all-optical shaper for multi-level pulse-amplitude modulation signal
  • A design method of all-optical shaper for multi-level pulse-amplitude modulation signal

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Embodiment

[0023] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0024] MZI (Mach-Zehnder Interferometer): Mach-Zehnder Interferometer;

[0025] PAM (pulse amplitude modulation): pulse amplitude modulation;

[0026] figure 1 It is a structural diagram of an all-optical shaper for multi-level pulse amplitude modulation signals in the present invention.

[0027] In this example, if figure 1 Shown, a kind of all-optical shaper of multi-level pulse-amplitude modulation signal of the present invention comprises: linear matching optical amplifier and MZI shaping module;

[0028] Wherein, the MZI shaping module includes input, output coupler, optical nonlinear unit and optical phase shifter; as figure 1 As shown, the transmission coefficient ratio of the optical nonlinear unit and the optical phase shifter is a constant value or an approximately linear relationship with the input optical power, and the phase d...

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Abstract

The invention discloses a design method of a multi-level pulse amplitude modulation signal all-optical shaper. Firstly, the MZI shaping module is determined according to the regeneration level number to realize the shaping function of the multi-level PAM signal, and then the multi-level is input according to the degradation. The difference between the PAM signal power and the working range of the MZI shaping module adjusts the gain of the linear matching optical amplifier so that the degraded multi-level PAM optical signal power matches the working range of the MZI shaping module; where the MZI shaping module is an all-optical shaping module The core of the device can be realized by a section of nonlinear optical medium, which mainly completes the shaping function of the multi-level PAM signal; in this way, the problem of signal degradation of the multi-level PAM optical signal in the optical fiber communication system is solved, and the multi-level PAM optical signal is extended. The transmission distance of the signal provides a strong support for the long-distance effective transmission of the multi-level PAM optical signal in the optical fiber communication system.

Description

technical field [0001] The invention belongs to the technical field of all-optical information processing, and more specifically relates to a design method of an all-optical shaper for multi-level pulse amplitude modulation signals. Background technique [0002] In optical fiber communication systems, with the continuous improvement of transmission bandwidth and speed requirements, optical-electrical-optical conversion technology can no longer meet the demand, and all-optical information processing technology has become the direction of future development. In an all-optical communication system, due to the ASE noise accumulation of optical amplifiers, fiber dispersion, fiber nonlinear effects, and interaction within or between channels, the optical signal is degraded, which seriously affects the quality of communication and limits To improve the capacity and transmission distance of the communication system, it is necessary to regenerate the degraded optical signal. At prese...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F2/00
CPCG02F2/004G02F2203/26
Inventor 孔祥健武保剑文峰周恒邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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