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Adjusting method and device for dispersion compensation

A technology of dispersion compensation and adjustment method, applied in the direction of eliminating distortion/dispersion, optical fiber transmission, electrical components, etc., can solve the problem of long adjustment time at the receiving end of the system, achieve low cost and reduce adjustment time

Active Publication Date: 2011-03-30
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention is proposed to solve the problem of long adjustment time at the receiving end of the system in the prior art. Therefore, the main purpose of the present invention is to provide an adjustment method and device for dispersion compensation to solve at least one of the above-mentioned problems

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  • Adjusting method and device for dispersion compensation
  • Adjusting method and device for dispersion compensation

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Embodiment 1

[0027] figure 1 It is a preferred flowchart of the method for adjusting dispersion compensation according to an embodiment of the present invention, which includes the following steps:

[0028] S102: Acquire multiple dispersion values ​​adjusted by a predetermined step length by the tunable dispersion compensation module within a predetermined range of dispersion values;

[0029] S104: Calculate the peak signal contrast corresponding to each output dispersion value, and select the peak signal contrast with the largest value among the calculated peak signal contrasts;

[0030] S106. Input the dispersion control voltage corresponding to the peak signal contrast with the maximum value to the tunable dispersion compensation module, so that the tunable dispersion compensation module outputs a dispersion value corresponding to the peak signal contrast with the maximum value. .

[0031] In this preferred embodiment, the TDC can be automatically adjusted to an appropriate value through closed...

Embodiment 2

[0038] At the receiving end, the optical signal is first amplified by an erbium-doped fiber amplifier (EDFA), the amplified optical signal is compensated for the residual dispersion of the long fiber with a TDC module, and then the DQPSK demodulator is used to realize the optical phase demodulation. The DLI output The four optical signals enter the double-balanced receiver to complete the photoelectric conversion. The peak signal detector at the receiving end detects the peak of the received optical signal and converts it into a voltage signal for output. The difference between the maximum value and the minimum value of the peak signal is defined as the peak signal contrast. The theoretical calculation shows that when the dispersion value is not appropriate, the peak signal contrast becomes smaller; when the dispersion value is appropriate, the peak signal contrast becomes larger.

[0039] figure 2 It is a schematic diagram of a preferred structure of the DQPSK receiving end acco...

Embodiment 3

[0045] image 3 It is another preferred structural schematic diagram of the DQPSK receiving end according to an embodiment of the present invention. Such as image 3 As shown, the DQPSK receiving end includes: DQPSK optical demodulator 301, double-balanced receiver 302, signal amplification unit 303 (including operational amplifier circuit), signal acquisition unit 304 (including analog-to-digital converter ADC), signal processing unit 305 ( It includes a microprocessor (MCU), a feedback control unit 306 (including a digital-to-analog converter DAC), an erbium-doped fiber amplifier (EDFA) 307, and a TDC module 308.

[0046] The input optical signal is amplified by EDFA, then adjusted by TDC dispersion, and then decoded by the DQPSK optical demodulator. The decoded optical signal is converted by the double-balanced receiver to complete the photoelectric conversion, and the peak signal detector of the double-balanced receiver is output The voltage VPDET is amplified and translated ...

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Abstract

The invention discloses an adjusting method and device for dispersion compensation, wherein, the method comprises: acquiring an adjustable dispersion compensation module in a predetermined value range to predetermine a plurality of dispersion values of step size adjustment; calculating a peak signal contrast ratio corresponding to each output dispersion value, and selecting the peak signal contrast ratio with the maximum value from the obtained peak signal contrast ratios by calculating; and inputting a dispersion control voltage corresponding to the peak signal contrast ratio with the maximum value to the adjustable dispersion compensation module so as to enable the adjustable dispersion compensation module to output the dispersion value corresponding to the peak signal contrast ratio with the maximum value. The invention solves the problem of longer time adjustment of the system receiving end in the prior art, and has the effects of flexibility and low cost.

Description

Technical field [0001] The present invention relates to the field of optical fiber transmission, and in particular to a method and device for adjusting dispersion compensation. Background technique [0002] In recent years, with the increase in speed and capacity of optical transmission systems, optical phase modulation methods represented by DQPSK (Differential Quadrature Phase Shift Keying) have attracted more and more attention in the industry. The DQPSK modulation method uses four different phases of light waves to represent different data signals, so its symbol speed is only half of the traditional light amplitude modulation method. Because the DQPSK modulation method has more superior performance, it is more suitable for large-capacity, long-distance optical transmission systems. [0003] The traditional DQPSK receiving end adopts manual adjustment receiving technology. When the optical delay interferometer (Delay Line Interference, referred to as DLI) performs phase adjustm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/18H04B10/17H04B10/158H04B10/2513
CPCH04B10/25133
Inventor 王栋沈百林
Owner ZTE CORP
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