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A pilot-based bias voltage control device and method for an iq modulator

An IQ modulator and bias control technology, applied in electromagnetic transmitters, electrical components, electromagnetic wave transmission systems, etc., can solve the problems of limited control accuracy, and the correlation coefficient cannot be strictly 0, so as to improve the sensitivity and facilitate the detection of frequency. point change, the effect of reducing the influence of noise

Active Publication Date: 2022-04-26
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, due to the influence of noise, the correlation coefficient can never be strictly 0, and the control accuracy is limited

Method used

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  • A pilot-based bias voltage control device and method for an iq modulator
  • A pilot-based bias voltage control device and method for an iq modulator
  • A pilot-based bias voltage control device and method for an iq modulator

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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 further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0043] The present invention proposes a bias voltage control system for an IQ modulator, which includes the following parts: laser, coupler, frequency shifter (AOM), IQ modulator, photodetector, modulation sub-board, control sub-board, and data processing module .

[0044] The three couplers used in the system include: two optical couplers with a splitting ratio of 95:5 and one optical coupler ...

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Abstract

The invention discloses a pilot-based bias voltage control device and method for an IQ modulator, belonging to the field of optical signal modulation. Including: generating a pair of orthogonal pilot signals with the same amplitude, correlating the sampled electrical signals with the corresponding pilot signals, calculating the correlation coefficient under different bias voltages within the fine adjustment range, and using the bias voltage corresponding to a correlation coefficient of 0 as the bias Set the voltage value, the electrical signal is the coherent detection electrical signal after the center frequency shifts the second optical signal and the third optical signal, the second optical signal is the remaining optical signal of the optical carrier except the first optical signal, and the third optical signal is K of the optical signal modulated by the IQ modulator 2 %. The invention combines coherent detection and correlation detection, adds relatively high-power local oscillator light when the signal light power is small, obtains a relatively high-power signal output, is easy to detect weak signals, and improves sensitivity. The bias voltage control is realized by monitoring the correlation coefficient, so that the correlation coefficient is 0 at the optimum bias voltage, which effectively improves the system sensitivity and control accuracy.

Description

technical field [0001] The invention belongs to the field of optical signal modulation, and more particularly relates to a pilot-based bias voltage control device and method for an IQ modulator. Background technique [0002] In recent years, optical fiber communication systems have been continuously developing towards higher speeds, longer distances, and higher capacities. It has been found through research that combining multiple modulation and multiplexing technologies can effectively help improve the total transmission capacity of optical fiber communication systems. Therefore, In order to meet the needs of the system today, various high-order modulation techniques have become a hot topic of research. [0003] The IQ modulator plays a key role in generating high-order modulation format signals at the transmitting end of the optical fiber communication system. The IQ modulator consists of two Mach-Zed (MZM) modulators and a phase modulator. During normal operation, the th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/50H04B10/077
CPCH04B10/50575H04B10/0775
Inventor 杨奇黄嘉琦吴金洋敖学渊戴潇潇邓磊程孟凡刘德明
Owner HUAZHONG UNIV OF SCI & TECH
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