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Photoelectric modulator noise reduction and bias point automatic control method and device

A photoelectric modulator and modulator technology, applied in the field of optical communication, to achieve stable control and reduce system noise

Active Publication Date: 2021-07-13
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the object of the present invention is to propose a method and device for photoelectric modulator noise reduction and bias point automatic control, to solve the problem of determining the bias operating point and reducing noise of the IQ-MZM modulator

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  • Photoelectric modulator noise reduction and bias point automatic control method and device
  • Photoelectric modulator noise reduction and bias point automatic control method and device
  • Photoelectric modulator noise reduction and bias point automatic control method and device

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Embodiment Construction

[0042] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0043] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present invention shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. "First", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Comprising" or "comprising" and similar words mean that the elements or items appearing before the word include the elements or items listed after the word and their equivalents, without excluding other elements or items. Words such as "connected" or "connected" are not limited to physical or mechan...

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Abstract

The present invention provides a photoelectric modulator noise reduction and bias point automatic control method and device, including: separately determine the corresponding relationship between the bias operating point and the DC bias voltage of two MZM modulators and a P-way phase shifter ; Determine the target bias operating points of the two MZM modulators and the P-way phase shifter respectively, and determine the corresponding target according to the corresponding relationship between each target bias operating point and the corresponding bias operating point and the DC bias voltage DC bias voltage; superimpose the first pilot signal to the DC bias voltage of the I-way MZM modulator, superimpose the second pilot signal to the DC bias voltage of the Q-way MZM modulator, the first pilot signal and the first pilot signal The phase difference of the two pilot signals is 180 degrees; dynamic amplitude modulation processing is performed on the first pilot signal and the second pilot signal, so that the jitter amplitudes output by the two MZM modulators are close to each other. The invention can determine the bias operating point of the IQ-MZM modulator and reduce system noise.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a noise reduction and bias point automatic control method and device for a photoelectric modulator. Background technique [0002] The IQ-MZM modulator is composed of two MZM modulators (Mach-Zehnder modulators) of I and Q and a phase shifter of P. Two quadrature phases are used for modulation, and the P-way phase shifter is used to adjust the phase of the two-way optical carrier signals. When applied to an optical communication system, due to the influence of environmental changes, the bias operating point of the MZM modulator and the P-way phase shifter is prone to drift, which affects the transmission performance and stability of the optical communication system. Therefore, it is necessary to adjust the IQ -The bias operating point of the MZM modulator is controlled to ensure that the modulator works in a normal working state. [0003] The existing control metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/50
CPCH04B10/505H04B10/50575
Inventor 朱门张会彬李良灿张杰赵永利高文杰
Owner BEIJING UNIV OF POSTS & TELECOMM
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