1.6-&#181;m single-frequency erbium-doped fiber laser based on two cascaded subrings

Yaqi Zhai; Han Wen; Haowei Chen; Baole Lu; Jintao Bai

doi:10.3788/COL202422.041406

Journals >Chinese Optics Letters >Volume 22 >Issue 4 >Page 041406 > Article

Chinese Optics Letters
Vol. 22, Issue 4, 041406 (2024)

1.6-µm single-frequency erbium-doped fiber laser based on two cascaded subrings

Yaqi Zhai^1,2, Han Wen^1,2, Haowei Chen^1,2,*, Baole Lu^1,2,**, and Jintao Bai^1,2

Author Affiliations

¹State Key Laboratory of Energy Photon-Technology in Western China, International Collaborative Center on Photoelectric Technology and Nano Functional Materials, Institute of Photonics & Photon-Technology, Northwest University, Xi’an 710127, China

²Shaanxi Engineering Technology Research Center for Solid State Lasers and Application, Shaanxi Provincial Key Laboratory of Photo-electronic Technology, Northwest University, Xi’an 710127, China

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DOI: 10.3788/COL202422.041406 Cite this Article Set citation alerts

Yaqi Zhai, Han Wen, Haowei Chen, Baole Lu, Jintao Bai, "1.6-µm single-frequency erbium-doped fiber laser based on two cascaded subrings," Chin. Opt. Lett. 22, 041406 (2024) Copy Citation Text

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Abstract

We demonstrate a stable narrow linewidth single-frequency erbium-doped fiber laser (EDFL) operating at 1.6 µm. A Fabry–Perot fiber Bragg grating and two cascaded subrings are incorporated in the main ring cavity to achieve single-frequency operation. The experimentally measured optical signal-to-noise ratio is greater than 73 dB. Furthermore, the linewidth of the EDFL is measured to be about 480 Hz by the self-built short-delayed self-heterodyne interferometry device. The laser shows superior stability, with no mode-hopping during the 60-min observation period. The proposed EDFL provides a new experimental idea for realizing a single-frequency fiber laser in the L-band.

Keywords

erbium-doped fiber laser single frequency two cascaded subrings

\frac{E_{3}}{E_{1}} = \sqrt{1 - α_{1}} \frac{\sqrt{1 - γ_{1}} - \sqrt{1 - α_{1}} \sqrt{1 - δ_{1}} e^{- β L_{1}} e^{i ω τ_{1}}}{1 - \sqrt{1 - δ_{1}} \sqrt{1 - α_{1}} \sqrt{1 - γ_{1}} e^{- β L_{1}} e^{i ω τ_{1}}} .

(1)

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\frac{E_{7}}{E_{5}} = \sqrt{1 - α_{2}} \frac{\sqrt{1 - γ_{2}} - \sqrt{1 - α_{2}} \sqrt{1 - δ_{2}} e^{- β L_{2}} e^{i ω τ_{2}}}{1 - \sqrt{1 - δ_{2}} \sqrt{1 - α_{2}} \sqrt{1 - γ_{2}} e^{- β L_{2}} e^{i ω τ_{2}}} .

(2)

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E_{5} = \sqrt{1 - msub} e^{i ω τ_{3}} e^{- β L_{3}} E_{3} .

(3)

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T = (\frac{E_{7}}{E_{1}}) \cdot {(\frac{E_{7}}{E_{1}})}^{*} = (\sqrt{1 - δ} e^{- β L_{3}} e^{i ω τ_{3}} \frac{E_{3}}{E_{1}} \frac{E_{7}}{E_{5}}) {(\sqrt{1 - δ} e^{- β L_{3}} e^{i ω τ_{3}} \frac{E_{3}}{E_{1}} \frac{E_{7}}{E_{5}})}^{*} .

(4)

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Δ ν^{'} = \frac{c ψ}{2 π n L}, ψ = \ln (\frac{I_{in}}{I_{out}}),

(5)

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S (f) = \frac{P_{0}^{2}}{4 π} \frac{Δ ν}{Δ ν^{2} + {(f - f_{0})}^{2}} (1 - e^{- 2 π τ_{d} Δ ν} (\cos (2 π τ_{d} (f - f_{0})) + Δ ν \frac{\sin (2 π τ_{d} (f - f_{0}))}{f - f_{0}})) + \frac{π P_{0}^{2}}{2} e^{- 2 π τ_{d} Δ ν} δ (f - f_{0}),

(6)

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Δ S = 10 \log_{10} S_{H} - 10 \log_{10} S_{L} = 10 \log_{10} \frac{(Δ ν^{2} + {(\frac{c}{n L})}^{2}) (1 + e^{msup})}{(Δ ν^{2} + {(\frac{3 c}{2 n L})}^{2}) (1 - e^{msup})},

(7)

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Yaqi Zhai, Han Wen, Haowei Chen, Baole Lu, Jintao Bai, "1.6-µm single-frequency erbium-doped fiber laser based on two cascaded subrings," Chin. Opt. Lett. 22, 041406 (2024)

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