Identification method and system for polarization-multiplexed optical signals and non-polarization-multiplexed optical signals

A technology for signal identification and multiplexing light, applied in transmission monitoring/testing/fault measurement systems, optical fiber transmission, eliminating distortion/dispersion, etc. , Easy to use, wide range of effects

Inactive Publication Date: 2014-12-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a polarization multiplexing and non-polarization multiplexing optical signal

Method used

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  • Identification method and system for polarization-multiplexed optical signals and non-polarization-multiplexed optical signals
  • Identification method and system for polarization-multiplexed optical signals and non-polarization-multiplexed optical signals
  • Identification method and system for polarization-multiplexed optical signals and non-polarization-multiplexed optical signals

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[0024] Such as figure 1 The modulation format recognition system shown includes: optical filter 1, dispersion module 2, high-speed optical detector 3, sampler and analog-to-digital converter 4, and DSP module 5. Combine below figure 1 To further describe the modulation format identification workflow of this specific embodiment is as follows:

[0025] Step 1. First, extract the channel to be identified through the optical filter, and filter out other signals and noise.

[0026] Step 2. Determine whether the dispersion value of the optical signal of the channel to be identified reaches the set dispersion value, if not, the extracted optical signal to be identified first enters the dispersion module, and the dispersion module applies the set dispersion value to the optical signal, if If yes, go directly to the next step.

[0027] Step 3. Obtain the time-domain digital sampling value of the optical signal, and calculate the output signal power distribution histogram after normalizatio...

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Abstract

The invention relates to the field of optical fiber communication, in particular to an identification method and system for polarization-multiplexed optical signals and non-polarization-multiplexed optical signals. The identification system comprises an optical filter, a dispersion module, a high-speed optical detector, a sampler, an analog-digital converter and a digital signal processing module. The identification method comprises the steps of extracting a channel to be identified, adding a set dispersion value to the signals to be identified, acquiring the time domain digital sampling values of the signals, calculating and outputting a signal power distribution histogram after normalization processing, finding out the abscissa corresponding to the maximum value of the histogram, and identifying the polarization-multiplexed optical signals and the non-polarization-multiplexed optical signals according to the comparison value of the abscissa of the maximum value and a judgment threshold value. The identification system is suitable for the signals with various rates and modulation formats and wide in working waveband, has high tolerance about signal quality deterioration caused by optical fiber dispersion, polarization mode dispersion and amplifier noise in the signal transmission process, and has the advantages of being simple in structure, high in cost performance, wide in application range and convenient and fast to use.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication, signal identification and digital signal processing, in particular to polarization multiplexing and non-polarization multiplexing signal identification and a system. Background technique [0002] Compared with the previous single-polarization optical fiber communication system, the polarization multiplexing technology can double the transmission capacity of the system, but the signal processing and signal detection methods are very different from the single-polarization and polarization-multiplexed signals. Therefore, in the signal processing Two different types of optical signals need to be accurately identified when receiving and receiving. In the past, in order to distinguish two kinds of signals, it is generally realized by using the characteristic that the degree of polarization (DOP) of the single polarization signal is close to 1 and the DOP of the polarization multipl...

Claims

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Application Information

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IPC IPC(8): H04B10/2513H04B10/07
Inventor 崔晟何晟
Owner HUAZHONG UNIV OF SCI & TECH
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