A High Linearity Method for Microwave Photonic Links Based on Dual-Wavelength Microring Modulator
A microwave photonic link and micro-ring modulator technology, applied in electromagnetic transmitters, electromagnetic wave transmission systems, electrical components and other directions, can solve the complex theory of Lorentz transfer function, can not meet the high linearity requirements of microwave photonic links, High control accuracy requirements, etc., to achieve the effect of small loss, simple structure, and low experimental difficulty
Active Publication Date: 2018-08-07
ZHEJIANG UNIV
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There is also a method of dual polarization or dual wavelength combined with parallel MZM to suppress third-order intermodulation, but the control accuracy is relatively high
Compared with MZM, the microring modulator has a simpler structure and smaller size, but the unique Lorentz transfer function theory is more complicated. The traditional single-wavelength microring modulator adjusts the working wavelength to Lorentz transfer At the maximum slope of the function, the first-order harmonic (HD1) reaches the maximum at this time, but the third-order intermodulation (IMD3) does not reach the minimum at this time, which cannot meet the high linearity requirements of microwave photonic links
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0022] Such as image 3 As shown, in the present invention, the microwave photonic chain is composed of two lasers (LD) at the transmitting end 1 and LD 2 ), an optical attenuator (optical attenuator, OA), an optical fiber coupler (optical fiber coupler, OFC), a microring modulator and a photodiode (Photodiode, PD) at the receiving end.
[0023] Two lasers LD 1 and LD 2 (1) The main wave (wavelength λ) can be independently generated 1 ) and auxiliary wave (wavelength λ 2 ), the optical power of the main wave is denoted as P 1 , LD 2 The optical attenuator (5) is connected to the optical fiber link so that the optical power of the auxiliary wave can be adjusted, denoted as P 2 , and combine the two wavelengths through the fiber coupler (4), load them onto the microring modulator (2), and finally directly detect them through the photodiode (3) at ...
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The invention discloses a micro-wave photon-link high linearity method based on a double-wavelength micro-ring modulator. In the method, through two lasers and one variable optical attenuator, double wavelengths of an adjustable power ratio are generated. Through an optical fiber coupler, a combined wave is taken as an optical carrier wave signal of a micro-ring modulator, and a photodiode is used to carry out direct detection on a link receiving end. One wave is a main wave and a main wave wavelength is adjusted to an optimum work point and is maintained. Another wave is an auxiliary wave, and a work wavelength and optical power of the auxiliary wave are adjusted to assist and compensate third-order cross modulation of the main wave so as to realize a micro-wave photon link with high linearity.
Description
technical field [0001] The invention relates to a method for realizing high linearity in a microwave photon link, in particular to a method for high linearity in a microwave photon link based on a dual-wavelength microring modulator. Background technique [0002] In recent years, microwave photonic technology, which combines microwave technology and light wave technology, has been widely used in cable television, fiber optic wireless systems, etc. It mainly studies how to use optoelectronic devices and methods to realize the generation, transmission distribution, and processing of microwave / millimeter wave signals. With the development of technology, microwave photonic technology requires devices and systems to have small size, light weight, low power consumption and stronger electromagnetic interference resistance while achieving higher speed, bandwidth, processing capability and dynamic range. [0003] In an analog optical link, however, a modulator such as a Mach-Zehnder...
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IPC IPC(8): H04B10/516H04B10/58
CPCH04B10/516H04B10/58
Inventor 余辉金浩王超江晓清
Owner ZHEJIANG UNIV