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Method and device for demodulating pilot-tone modulation signals

An optical modulation and signal technology, applied in the field of optical communication network, can solve the problem of extracting optical modulation top signal and so on

Active Publication Date: 2014-08-20
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method and device for demodulating the optical modulation signal, which is used to solve the problem of how to extract the optical modulation signal under the influence of noise in the optical network containing the frequency of the optical modulation signal

Method used

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  • Method and device for demodulating pilot-tone modulation signals
  • Method and device for demodulating pilot-tone modulation signals
  • Method and device for demodulating pilot-tone modulation signals

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Experimental program
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Embodiment 1

[0080] In the embodiment of the present invention, the modulation method adopted by the signal transmission source end is: use frequency f1 as bit information "1", use frequency f2 as bit information "0", and the signal transmission source end loads a schematic diagram of the frequency of the optical modulation signal Such as Figure 4 shown. In this embodiment, f1 is used as bit information 1, and f2 is used as bit information 0, which is only one of many modulation methods. The source end can use other modulation methods according to specific applications. For example, f1 is used as bit information 1 without top modulation. Frequency is used as bit information 0, etc.

[0081] In the embodiment of the present invention, when receiving such as Figure 4 When the frequency information of the optical modulation signal in the modulation mode is shown, the method for demodulating the optical modulation signal includes:

[0082] Step 1, using the FFT or DFT algorithm to calcula...

Embodiment 2

[0090] In the embodiment of the present invention, the modulation mode adopted by the signal transmission source end is as follows: the frequency f1 is used as the bit information "1", and "0" is indicated when there is no tuning frequency. The schematic diagram of the signal transmission source loading the optical tuning signal frequency is as follows Figure 6 shown.

[0091] In the embodiment of the present invention, when receiving such as Figure 6 When the frequency information of the optical modulation signal in the modulation mode is shown, the method for demodulating the optical modulation signal includes:

[0092] Step 1, utilize the FFT or DFT algorithm to calculate the intensity value at the frequency (f1) of each light modulation signal frequency (f1) place that is received;

[0093] In this embodiment, set the time period as the time value of receiving the 6-bit signal, wherein, for a certain period of time, calculate the intensity value at the frequency of each...

Embodiment 3

[0099] The implementation of this embodiment is based on the premise of any of the above-mentioned embodiments, and is used to judge whether the optical top adjustment signal is lost or the top adjustment signal conflicts through the obtained intensity range, specifically:

[0100] In this embodiment, it is assumed that the intensity range at a certain frequency in several consecutive time periods is counted by using the method described in the above-mentioned embodiment 2, and the number of intensity range distributions in this period of time is obtained.

[0101] Such as Figure 8 As shown, the intensity range of the optical modulation signal frequency f1 is calculated for several consecutive periods of time. It can be seen from the figure that the signal intensity value of f1 is within a certain intensity range during this period of time, and according to the signal transmission source modulation As a rule, the frequency of f1 should not all be the same value during this pe...

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Abstract

Disclosed are a method and a device for demodulating an optical pilot tone signal. The method comprises: according to a set period of time, calculating in a segmented manner the strength value at the frequency of each received optical pilot tone signal; by using the calculated strength value within each period of time, determining the signal strength range and the noise strength range at the frequency of each optical pilot tone signal within each period of time; and matching each strength value with the strength range within a corresponding period of time, and after the strength range to which each strength value belongs is obtained, demodulating a bit value corresponding to each strength value. In the present invention, a strength range of noise and a strength range of an optical pilot tone signal are adjusted dynamically. In any noise distribution status, during demodulation of an optical pilot tone signal, the same correspondence between the frequency and wavelength of an optical pilot tone signal can be adopted to perform demodulation of an optical pilot tone signal.

Description

technical field [0001] The invention relates to the technical field of optical communication networks, in particular to a method and device for demodulating an optical top adjustment signal. Background technique [0002] With the development of WDM (Wavelength Division Multiplex, wavelength division multiplexing), the current optical communication network can simultaneously transmit multiple optical signals or optical channels of different wavelengths in the same optical fiber, and based on ROADM (Reconfigurable Optical Add-Drop Multiplexer , reconfigurable optical add-drop multiplexer) technology facilitates the on-demand configuration of each wavelength in optical communication, so that the wavelength in the optical network does not maintain the same path between two sites, or a certain wavelength is not allocated forever For a certain 2 sites. [0003] In order to carry out network topology identification and optical channel detection, it is possible to superimpose low-f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/07H04B10/25H04B10/075
CPCH04B2210/075H04B10/0775
Inventor 尚迎春
Owner ZTE CORP