Control method of IQ modulator and system thereof

A technology of IQ modulator and control method, which is applied in the field of communication, and can solve the problems of transmission fluctuation, affecting adjustment speed and sensitivity, affecting control efficiency and accuracy, etc.

Active Publication Date: 2017-05-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the non-patent literature (Gui T, Li C, Yang Q, et al. Auto bias control technique foroptical OFDM transmitter with bias dithering. [J]. Optics Express, 2013, 21 (5): 5833-5841.) published a The automatic control method of a kind of IQ modulator, this method needs to do frequency spectrum analysis (FFT calculation) in microcontroller (MCU), so calculation process is comparatively complicated; And in this method, the power of IQ modulator and rel

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  • Control method of IQ modulator and system thereof
  • Control method of IQ modulator and system thereof
  • Control method of IQ modulator and system thereof

Examples

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Example Embodiment

[0091] Example 1

[0092] This embodiment provides a control method and control circuit of an IQ modulator. The structure of the IQ modulator in this embodiment is as follows figure 1 As shown, it consists of a beam splitter, I channel MZM modulator (MZM I), Q channel MZM modulator (MZM P) phase delayer (P), coupler and output fiber; the first output end of the beam splitter is connected The input terminal of the I channel MZM modulator, the second output terminal is connected to the input terminal of the Q channel MZM modulator, the output terminal of the Q channel MZM modulator is connected to the phase retarder, and the output terminal of the I channel MZM modulator is connected to the first of the coupler At the input end, the output end of the phase retarder is connected to the second input end of the coupler, and the output end of the coupler is connected to the input fiber; the control signal of the IQ modulator is: with bias V I I control signal V I ’, with bias V Q Q con...

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Abstract

The invention discloses a control method of an IQ modulator and a system thereof. The control method comprises the following steps of adding disturbance signals of a first disturbance frequency f1 and a second disturbance frequency f2 in an I bias voltage and a Q bias voltage of a light IQ modulator; detecting an output light signal output of the light IQ modulator and the added disturbance signals in real time, and monitoring direct current light power and calculating a correlation coefficient of the input disturbance signals and the output light signal; and using a light power value and the correlation coefficient to carry out feedback adjusting on the bias voltages of the light IQ modulator so that a bias state of the light IQ modulator satisfies an adjusting object. In the invention, through establishing connection between a bias voltage VI of an I path, a bias voltage VQ of Q path control and a bias voltage VP of a P path and the first disturbance frequency f1 and the second disturbance frequency f2, spectrum analysis in the prior art is replaced so that a calculating method is simplified; and an adjusting process possesses directivity, and a bias resolution of a control signal is less than 0.005Vpi.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method and system for controlling an IQ modulator. Background technique [0002] Optical IQ modulation refers to optical in-phase / quadrature modulation (In-phase and Quadraturephase, IQ). Since this modulation technology can be used to generate various optical-carrying radio frequency signals in complex modulation formats related to amplitude and phase, optical IQ modulation technology is widely used in the field of optical communication. Such as figure 1 As shown, the IQ modulator is composed of two MZM modulators (Mach-Zehnder modulators) and a phase delay P, and the I-way MZM modulator (MZM I) and the Q-way MZM modulator (MZM Q) are respectively for the optical The two orthogonal phases of the carrier signal are modulated, and the phase delay P ensures the orthogonality of the two optical carrier phases. Due to the sensitivity of the IQ modulator to temperature and stres...

Claims

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Application Information

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IPC IPC(8): H04L27/20
CPCH04L27/20
Inventor 邓磊李晓雷刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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