A method to realize flexible and controllable light wave delay
A time-delay and flexible technology, applied in the optical field, to achieve the effect of flexible and controllable parameters, free to erase and write
Active Publication Date: 2018-09-11
ANSHAN REALPHOTONICS TECH CO LTD
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Problems solved by technology
As an all-optical generation and control grating technology introduced into the field of microwave photonics, the Brillouin dynamic grating provides a new way for all-optical microwave signal processing; but the current international research is limited to the uniform Brillouin dynamic grating. Production and application, this is because the Brillouin dynamic grating is generated by the interference of two beams of highly coherent pump light in the optical fiber, and the period of the grating is determined by the wavelength of the pump light, so a grating with a uniform period is produced
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[0026] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Furthermore, it should be understood that development work, while potentially complex and time-consuming, would be a routine undertaking for those skilled in the art having the benefit of this disclosure.
[0027] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the solution ac...
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The invention provides a method for realizing flexible and controllable light wave time delay amount, belongs to the field of optics and aims at solving the problems that existing Brillouin dynamic gratings are gratings of uniform cycles generated by coherent light and cannot realize linear chirp and adjustable light time delay amount. According to the method, a liquid filling high birefringence photonic crystal fiber and a Brillouin dynamic grating technology are combined, and temperature gradient is provided by utilizing a high absorption fiber heating mode and fiber birefringence linear distribution is realized so that the Brillouin dynamic gratings having the linear chirp features are generated. The light wave time delay amount of the gratings generated by the method can be flexibly controlled so that a wider application space can be developed in the field of all-optical microwave signal processing.
Description
technical field [0001] The invention relates to a method for realizing flexible and controllable light wave delay, which belongs to the field of optics. Background technique [0002] The fiber Bragg grating (FBG) technology developed in the mid-1990s provides a flexible method for all-optical processing of microwave signals. As a wavelength-selective delay device, FBG can provide true delay independent of microwave frequency. Among them, linear chirped FBG is widely used because of its continuous controllable delay, such as microwave phase shifter for optically controlled phased array antenna. and microwave photonic filters, etc. From the characteristics of the linear chirped FBG, it can be seen that the position of the light wave reflection point is linearly related to the wavelength, so the continuous delay can be obtained by continuously tuning the output wavelength of the laser. However, FBG is a permanent static grating. Once fabricated, its various parameters are dif...
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IPC IPC(8): H01S3/30G02F1/35
CPCG02F1/35H01S3/30H01S3/302
Inventor 张洪英袁治君刘子叶张绍鹏高玮
Owner ANSHAN REALPHOTONICS TECH CO LTD