Tunable true time delay test device and method based on discrete chirped fiber gratings

A chirped fiber grating and experimental device technology, applied in optical fiber transmission, electrical components, electromagnetic wave transmission systems, etc., can solve the problems of multi-path error, low tuning accuracy, etc., and achieve good real-time performance, high tuning accuracy, and save delay. Effect of Time Difference Compensation Unit

Active Publication Date: 2017-05-31
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this system introduces multipath errors and has low tuning accuracy

Method used

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  • Tunable true time delay test device and method based on discrete chirped fiber gratings
  • Tunable true time delay test device and method based on discrete chirped fiber gratings
  • Tunable true time delay test device and method based on discrete chirped fiber gratings

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Embodiment 1

[0054] Experimentally tested a fixed-wavelength laser 2 with an output wavelength of 1542.9nm; a tunable laser 1 with a center wavelength of 1550.9nm and a tuning range of ; The first wavelength division multiplexer 3-1, the second wavelength division multiplexer 3-2 and the third wavelength division multiplexer 3-3 are all the same, and the wavelength ranges of the two wavelength division channels are respectively: , ; The reflection wavelength of the first uniform fiber grating 7-1 is 1542.9nm, the grating length is 6mm, the central reflection wavelength of the first linear chirped fiber grating 8-1 is 1550.9nm, the chirp coefficient is 3nm / cm, and the grating length is 12mm, the head-to-tail distance between two fiber gratings is 11mm; the reflection wavelength of the second uniform fiber grating 7-2 is 1542.9nm, the grating length is 6mm, the center reflection wavelength of the second linearly chirped fiber grating 8-2 is 1550.9nm, the chirped The coefficient is 6nm / cm...

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Abstract

The invention discloses a tunable true time delay test device and method based on discrete chirped fiber gratings. Light emitted by a tunable laser and a fixed wavelength laser at the same time enters a discrete chirped fiber grating time delay unit composed of uniform fiber gratings and linear discrete chirped fiber gratings successively in two times after microwave signal modulation so as to complete two-stage time delay, and four paths of electric signals with equal time delay difference are output at last; and meanwhile, the output wavelength of the tunable laser and the tunable linear fiber gratings are synchronously tuned to realize the change of the time delay difference. By adoption of the tunable true time delay test device and method disclosed by the invention, the output of four paths of signals with equal time delay difference and fine tuning can be realized, the instantaneity is good, although a path of error sources is imported, the system can neglect the error sources by means of smart combination of the linear chirped fiber gratings, meanwhile the test device is simplified, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a tunable true delay experimental device and method based on a discrete chirped optical fiber grating. Background technique [0002] In optical fiber communication technology, fiber grating is a rising star in recent years. It is considered to be another major breakthrough after the erbium-doped fiber amplifier, and plays an important role in promoting the development of optical fiber communication technology. In the field of phased arrays, the fiber delay line with fiber grating as the core can provide real-time delay beam steering with no skew and wide instantaneous bandwidth for high-performance radar systems. It is light in weight, small in size, not susceptible to electromagnetic radiation interference, and has the advantages of extremely low electrical noise, which is very suitable for airborne or spaceborne applications. [0003] Scholars at home...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/25H04B10/079
CPCH04B10/0795H04B10/25891
Inventor 马骏王朕朱日宏
Owner NANJING UNIV OF SCI & TECH
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