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PAM signal all-optical regeneration device and method

A regenerative device and signal light technology, which is applied in the field of optical communication, can solve the problems of limited number of regenerative levels, poor working stability, and low noise tolerance, and achieve the effects of large noise tolerance, convenient design, and good effect

Active Publication Date: 2018-05-25
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

On the other hand, during the transmission process of the PAM signal, there will be amplitude jitter, which will gradually degrade the signal and eventually affect the judgment. Therefore, it is necessary to perform all-optical regeneration on it before a bit error occurs.
[0004] Existing all-optical PAM regeneration schemes mainly include structures such as nonlinear fiber gratings, single nonlinear optical loop mirrors, and Mach-Zehnder interferometers based on highly nonlinear fibers. The number of levels is limited, or the work stability is poor, etc.

Method used

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  • PAM signal all-optical regeneration device and method

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[0026] For the convenience of description, the relevant technical terms appearing in the specific implementation are explained first:

[0027] PAM (Pulse Amplitude Modulation): pulse amplitude modulation;

[0028] NOLM (Nonlinear optical fiber loop mirror): nonlinear optical fiber loop mirror;

[0029] ASE (Amplified Spontaneous Emission): Amplified spontaneous emission.

[0030] figure 1 It is a schematic diagram of a device for all-optical regeneration of PAM signals in the present invention.

[0031] In this example, if figure 1 As shown, a device for all-optical regeneration of PAM signals in the present invention includes: multiple PAM signal all-optical regeneration units connected to input matching optical amplifiers and output matching optical amplifiers, for realizing all-optical regeneration of PAM signals;

[0032] Among them, such as figure 1 As shown, the last PAM signal all-optical regeneration unit only has an optical isolator and NOLM, and each of the rema...

example 1

[0051] Example 1—Amplitude regeneration of a PAM-4 signal

[0052] According to the actual needs of PAM-4 amplitude regeneration, two-stage NOLM is used to realize the specific structure as Figure 4 shown. Assuming that the PAM-4 signal level interval output from the input matching optical amplifier is 0.27W, it is matched by adjusting the parameters of the first-stage NOLM. Specifically, a 2km-long high-non-linear optical fiber with an attenuation coefficient of 0.21dB / km and a non-linear coefficient of 14 / W / km is used to form the first-stage NOLM, and the pass-through efficiency of the optical coupler is 0.96. Figure 5 is the normalized power transfer curve of the first-stage NOLM, and the corresponding operating point is also marked in the figure.

[0053] Then design the parameters of the second-level NOLM so that its normalized operating point corresponds to the normalized operating point of the first-level NOLM. If a high nonlinear fiber with the same parameters is ...

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Abstract

The invention discloses a PAM signal all-optical regeneration device and method. The regeneration of the PAM signal all-optical is realized by reusing multiple PAM signal all-optical regeneration units, specifically, an input-output power transfer function meets a step function through a non-linear effect of NOLM (non-linear optical fiber loop mirror); through the above input power, the shake caused by the noise thereof can become smooth at an output end, the process is realized in a full-optical domain, the transmission rate cannot be influenced, and the device and method can adapt to the existing high-speed transmission system.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and more specifically relates to a device and method for all-optical regeneration of a PAM signal. Background technique [0002] In the optical fiber communication system, ASE noise, fiber dispersion, fiber nonlinear effects, etc., will cause the degradation of the optical signal, and they will cause the signal strength to jitter or even be distorted, thereby affecting the judgment. The process of suppressing the amplitude noise of the signal is called shaping regeneration technology, which has experienced three development stages: full electric domain processing, optical / electrical / optical processing and all optical domain processing. The all-optical plastic regeneration technology can avoid the "electronic bottleneck" problem, and has become the focus of research in recent years. [0003] As a popular signal transmission technology for high-speed signal interconnection in next-ge...

Claims

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Application Information

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IPC IPC(8): H04B10/25
CPCH04B10/25H04B10/25891
Inventor 郭飚武保剑文峰邱昆
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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