A fast wavelength switchable fiber laser

By combining the fiber micro-nano ring with a single-mode-less-mode fiber hybrid structure and a fast-responsive thermally sensitive two-dimensional polymer composite nanomaterial in a multi-wavelength fiber laser, the problem of small wavelength tuning range and slow response speed in the prior art is solved, and efficient and fast wavelength switchable laser output is achieved.

CN114976837BActive Publication Date: 2025-03-25NANJING UNIV OF POSTS & TELECOMM
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Patent Information

Application Number
CN202210460714.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-06-29
Publication Date
2025-03-25
Estimated Expiration
2042-06-29

AI Technical Summary

Technical Problem

The existing multi-wavelength fiber lasers have problems such as small tuning range, slow response speed, large loss and complex structure in terms of wavelength tuning.

Method used

Using closed-loop connected wavelength division multiplexer, gain fiber, polarization controller, isolator, fiber micro-nano ring and coupler, the fiber micro-nano ring realizes strong light field coupling and interference effect through a single-mode-less-mode fiber hybrid structure, and covers the coating of the rapidly responding to thermally sensitive two-dimensional polymer composite nanomaterials on the surface of the melting cone area.

Benefits of technology

It realizes high contrast and thermally tunable interference spectrum, ensuring the mode selection and thermal tuning capabilities of fiber lasers, and also has the characteristics of simple structure, fast thermal response speed and high sensitivity.

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Abstract

The invention discloses a fast wavelength switchable fiber laser, comprising a wavelength division multiplexer, a gain fiber, a polarization controller, an isolator, an optical fiber micro-nano ring and a coupler connected in a closed loop; the optical fiber micro-nano ring comprises a first single-mode fiber, a first few-mode fiber, a second single-mode fiber, a second few-mode fiber and a third single-mode fiber which are sequentially spliced ​​by offset fusion, the second single-mode fiber is bent into a ring shape, and the first few-mode fiber and the second few-mode fiber are coupled and connected by fusion taper to form an optical fiber micro-nano ring with a Sagnac structure; the end of the first single-mode fiber away from the first few-mode fiber is connected to the isolator, and the end of the third single-mode fiber away from the second few-mode fiber is connected to the coupler; the wavelength division multiplexer and the coupler are also connected to a pump source and a spectrometer respectively; the invention can realize fast tuning, wavelength-switchable multi-wavelength laser output, and has the advantages of a large tuning range, a fast response speed, a small loss and a simple structure.
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