Dynamics of frequency detuning in a hybrid Er-doped mode-locked fiber laser

Chenyue Lv; Baole Lu; Jintao Bai

doi:10.1364/PRJ.475036

Photonics Research, Volume. 11, Issue 3, 383(2023)

Dynamics of frequency detuning in a hybrid Er-doped mode-locked fiber laser

Chenyue Lv^1,2, Baole Lu^1,2,3、*, and Jintao Bai^1,2,4、*

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, Provincial Key Laboratory of Photo-Electronic Technology, Northwest University, Xi’an 710069, China

³e-mail: lubaole1123@163.com

⁴e-mail: baijt@nwu.edu.cn

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Figures & Tables(6)

Fig. 1. Schematic of hybrid amplitude modulation actively and passively all-polarization-maintaining erbium-doped mode-locked fiber laser. (PM, polarization-maintaining; LD, laser diode; WDM, wavelength-division multiplexer; EDF, erbium-doped fiber; OC, optical coupler; PC, polarization controller; ISO, isolator.)

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Fig. 2. (a)–(c) Output oscilloscope traces, (d)–(f) time-averaged spectra, and (g)–(i) RF spectra of the mode-locked fiber laser as frequency detuning increases. (a), (d), (g) Doubly periodic mode-locking; (b), (e), (h) fundamental mode-locking; (c), (f), (i) second-harmonic mode-locking.

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Fig. 3. Mode-locked pulses under a single Q-switched envelope: (a) doubly periodic Q-switched mode-locked pulse; (b) fundamental Q-switched mode-locked pulse; (c) second-harmonic Q-switched mode-locked pulse.

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Fig. 4. Numerical simulation plots of fundamental mode-locking (a) time domain, (b) frequency domain, and (c) peak values under different detuning conditions with fd=0.0, −0.5, −1.5, and −2.5 MHz.

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Fig. 5. Numerical simulation plots of doubly periodic mode-locking (a) time domain, (b) frequency domain, and (c) peak values under different detuning conditions with fd=0.0, −0.25, −0.75, and −1.25 MHz.

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Table 1. Parameters in the Numerical Simulation of Hybrid Amplitude Modulation Actively and Passively Erbium-Doped Mode-Locked Fiber Laser

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Table 1. Parameters in the Numerical Simulation of Hybrid Amplitude Modulation Actively and Passively Erbium-Doped Mode-Locked Fiber Laser

Variable	Value	Variable	Value	Variable	Value
$β_{2 PMF}$	$- 22 {ps}^{2} / km$	$β_{2 EDF}$	$- 20 {ps}^{2} / km$	$γ_{PMF}$	$1.3 W^{- 1} {km}^{- 1}$
$γ_{EDF}$	$4.7 W^{- 1} {km}^{- 1}$	$G$	5	$P_{sat}$	130 pJ
$l$	$0.15 m^{- 1}$	$Ω_{g}$	13 nm	$V_{AM}$	8 V
$V_{π}$	2.75 V	$f_{AM}$	Varying (Hz)	$f_{R}$	12.24 MHz
$α$	30°	$β$	45°	$θ$	Varying