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MZ modulator random point bias control device and method

A technology of bias control and modulator, which is applied in the field of optical communication and optical sensing, and can solve the problems such as the drift of the working point of the MZ modulator

Inactive Publication Date: 2015-09-09
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is how to solve the problem of the drift of the operating

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  • MZ modulator random point bias control device and method
  • MZ modulator random point bias control device and method
  • MZ modulator random point bias control device and method

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0026] figure 1 is a schematic diagram of the structure of the MZ modulator; figure 2 A graph of the transfer characteristic. The MZ modulator includes an optical waveguide 1, a bias input terminal 3, and a radio frequency input terminal 2; wherein a radio frequency signal is input from the radio frequency input terminal, and a bias voltage is input from the bias input terminal. The transfer characteristic curve of the MZ modulator is as figure 2 As shown, it is a cosine-like function curve and has periodicity, so the control of the working point of the MZ modulator only needs to realize the bias control within one cycle. MZ modulator output optical power P o (t) can be expressed as:

[0027] ...

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Abstract

The invention provides an MZ modulator random point bias control device and method. The device comprises an optical branching device, an optical detector, a power detector, an analog-to-digital converter, a digital signal processing controller and a digital-to-analog converter. Part of the output optical signal of an MZ modulator is separated out by the optical branching device to serve as a feedback signal; the feedback signal is converted to an electric signal by the optical detector; the average optical power of the output optical signal is obtained through power detection; the signal is converted to a digital signal by the analog-to-digital converter; the digital signal is sent to the digital signal processing controller for calculation processing; a bias point is determined; the proper bias voltage is set through conversion of the digital-to-analog converter and thus the bias control is finished. The device and the method solve the problem of operating point drift of the MZ modulator and can control the operating point of the MZ modulator at random points. Compared with the effect of the prior art, the MZ modulator bias control process is free of the influence of optical power fluctuation and the structure and the method are relatively simple.

Description

technical field [0001] The invention relates to the technical fields of optical communication and optical sensing, and more particularly relates to a device and method for controlling an arbitrary point bias of an MZ modulator. Background technique [0002] Lithium niobate (LiNbO3) Mach-Zehnder (MZ) modulator is an optoelectronic device widely used in optical fiber communication systems, optical fiber sensing and other fields. The MZ modulator is composed of two waveguide arms and two Y-shaped branches. By adjusting the electric field on the two waveguide arms, the transmission speed of the light beams in the two waveguide arms is different to generate an optical path difference, so that the two beams of light interfere. Realize the modulation of the optical signal. The transmission characteristic curve of the MZ modulator is a cosine-like function curve, which is generally periodic. Due to the structure of the MZ modulator itself, such as environmental stability, mechanic...

Claims

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Application Information

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IPC IPC(8): G02F1/03
CPCG02F1/0327G02F1/21G02F1/212
Inventor 袁学光陶金晶张阳安张锦南
Owner BEIJING UNIV OF POSTS & TELECOMM
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