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A Broadband Linearization Method for Microwave Photonic Links Based on Dual Driver DPMZM

A microwave photonic link, dual-drive technology, applied in electromagnetic wave transmission systems, electromagnetic receivers, electrical components, etc., can solve problems such as bias points without third-order intermodulation, achieve simple structure, overcome power fading, realize The effect of broadband linearization

Active Publication Date: 2016-08-10
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0006] Research since the 1990s has found that a single MZM has an available bias point to suppress the second-order harmonic, but there is no available bias point to suppress the third-order intermodulation, so it is necessary to find a modulation scheme that suppresses the third-order intermodulation , requires the use of cascaded or parallel MZ modulators

Method used

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  • A Broadband Linearization Method for Microwave Photonic Links Based on Dual Driver DPMZM
  • A Broadband Linearization Method for Microwave Photonic Links Based on Dual Driver DPMZM
  • A Broadband Linearization Method for Microwave Photonic Links Based on Dual Driver DPMZM

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Embodiment Construction

[0016] exist figure 1 In , the microwave photonic link is composed of a transmitting end A and a receiving end B. In part A of the transmitting end, the microwave source (1) emits radio frequency electrical signals of different frequencies and sends them to the phase control module (2) composed of an electric phase shifter, and then loads them on the four driving electrodes of the electro-optical modulation device DPMZM (3). (3) It consists of its uplink sub-MZM (4) and downlink sub-MZM (5). Part B of the receiving end uses a photodiode PD (6) for direct detection.

[0017] figure 2 , the microwave source (1) emits two frequencies w 1 and w 2 radio frequency signal with , loaded onto the four driving electrodes a, b, c, and d of the two sub-MZMs (4) (5) of the DPMZM (3) after phase control (2). For the uplink sub-MZM(4), the RF signal with Pass through the electric phase shifter PS before loading to electrode a 2 A phase shift of 90 degrees is carried out, and n...

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Abstract

The invention provides a double-drive DPMZM (Dual-Parallel-Mach-Zehnder-Modulator)-based broadband linearization method for directly detecting a microwave photon link. According to the method, by controlling phase position relation of microwave signals, input into the double-drive DPMZM, among four electrodes of two sub MZMs (Mach-Zehnder Modulator) and offset points of the two sub MZMs of the DPMZM, the two sub MZMs are used for modulation for same single side bands, after synthesis, main sources of IMD3 (Third-Order Intermodulation) and HMD2 (Second-Order Harmonic Distortion) in output optical spectrum output by the DPMZM are offset, and thus, the broadband linearization of the link is realized.

Description

technical field [0001] The present invention relates to a broadband linearization method in a microwave photonic link, more specifically, to a microwave photonic link based on a dual-drive dual-parallel Mach-Zehnder modulator (Dual-Parallel Mach-Zehnder Modulator, DPMZM) wideband linearization method. Background technique [0002] In recent years, microwave photonics is a rapidly developing subject field at home and abroad. Microwave photonic links have the advantages of large transmission capacity, anti-electromagnetic interference, and no traditional electrical bottlenecks. Microwave photonics has very important applications in communication, sensing, national defense and other fields. Among them, the microwave photonic link with a large dynamic range is a research direction in this field. [0003] The dynamic range of a microwave photonic link refers to the power range between the smallest signal and the largest signal that the link can transmit. It is restricted by tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/548H04B10/66
Inventor 喻松李健张一辰蒋天炜张阮彬谢倩顾畹仪
Owner BEIJING UNIV OF POSTS & TELECOMM
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