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Bias control method and system for multiple MZ modulator

A technology of bias control and modulator, applied in the field of optical transmission network, can solve the problems of serious system power cost, large disturbance range of main service optical signal intensity, affecting the quality of main service optical signal, etc., to reduce impact and reduce power cost Effect

Inactive Publication Date: 2009-02-11
HUAWEI TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] To sum up, in the process of implementing the present invention, the inventors have found at least the following problems in the prior art: when performing bias control on multiple MZ modulators, the amplitude of the intensity disturbance of the main service optical signal will be large, so that The quality of the optical signal of the main service is affected, and the resulting system power cost is relatively serious

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  • Bias control method and system for multiple MZ modulator
  • Bias control method and system for multiple MZ modulator
  • Bias control method and system for multiple MZ modulator

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Embodiment 1

[0028] Embodiment 1: for the method for carrying out bias control to a plurality of MZ modulators, such as image 3 Shown is the flowchart of the method described in this embodiment, including in the figure:

[0029] Step 11: Load the low-frequency disturbance signal. By controlling the disturbance frequency generator, only one low-frequency disturbance signal is loaded on the main service optical signal at the same time. Specifically, in this embodiment, multiple low-frequency disturbance signals are controlled in a time-division multiplexing manner to have only one are loaded on the corresponding MZ modulator, so that only one low-frequency disturbance signal is loaded on the main service optical signal at the same time.

[0030] Taking the time-division multiplexing of two low-frequency disturbance signals as an example, Figure 4 It is a schematic diagram of time-division multiplexing of two low-frequency disturbance signals. In the figure: two low-frequency disturbance ...

Embodiment 2

[0037] Embodiment 2: The difference between this embodiment and Embodiment 1 is that instead of controlling the loading of multiple low-frequency disturbance signals by means of time division multiplexing, a controllable switch is used to control the alternate loading of multiple low-frequency disturbance signals to the corresponding MZ adjusters, so that only one low-frequency disturbance signal is loaded on the main service optical signal at the same time.

[0038] Specifically, the controllable switch is used to turn on only one low-frequency disturbance signal channel at the same time, and the other low-frequency disturbance signal channels are turned off, so that the low-frequency disturbance signal can be alternately loaded into the main service optical signal; Then use the bias control method described in step 12 of Embodiment 1 to perform bias control on multiple MZ modulators.

[0039] Taking the bias control of two MZ modulators as an example, the controllable switch...

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Abstract

The inventive embodiment provides a bias control method for a plurality of MZ modulators in an optical transmission network, and a system. The method can achieve bias control of only one MZ modulator in the same time point by controlling low-frequency disturbing signals in such a manner that only one low-frequency disturbing signal is loaded on a main service optical signal at the same time point. According to the above technical scheme, only one low-frequency disturbing signal is loaded on the main service optical signal at the same time point, thereby effectively reducing the influence on the main service optical signal in the optical path while achieving bias voltage control, and reducing the system power penalty.

Description

technical field [0001] The invention relates to the field of optical transmission networks, in particular to a bias control method and system for multiple MZ modulators in the optical transmission network. Background technique [0002] In the optical transmission system, electro-optic conversion has various modulation methods, and can also generate various modulation patterns. Currently, electro-optic conversion modulators commonly used include EA (Electro Absorption, electric absorption) type and MZ (Mach-Zehnder, Mach-Zehnder, Mach- Zender) type. Among them, the characteristic curve of the MZ modulator is as follows figure 1 As shown, the horizontal axis V in the figure represents the bias voltage of the modulator, and the vertical axis Power Out represents the output optical power, that is, the intensity of the output optical signal; here, Vpi is defined as the output optical power MAX (maximum) and MIN of the modulation curve The voltage difference between the (minimum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/00G02F1/01H04B10/50
CPCH04B10/50575H04B10/5051G02F2203/20G02F2001/212G02F1/212
Inventor 王国忠樊晓燕田丁温晔
Owner HUAWEI TECH CO LTD
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