Dual-wavelength distributed feedback laser array based on four-phase-shifted sampled Bragg grating for terahertz generation

We propose and experimentally demonstrate a dual-wavelength distributed feedback (DFB) laser array utilizing a four-phase-shifted sampled Bragg grating. By using this grating, the coupling coefficient is enhanced by approximately 2.83 times compared to conventional sampled Bragg gratings. The device...

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Bibliographic Details
Published in:Optics letters 2024-06, Vol.49 (12), p.3472
Main Authors: Fan, Yizhe, Yuan, Bocheng, Al-Rubaiee, Mohanad, Sun, Yiming, Zhu, Simeng, Marsh, John H, Hou, Lianping
Format: Article
Language:English
Subjects:
Bragg gratings
Coupling coefficients
Distributed feedback lasers
Laser arrays
Lasers
Lasing
Misalignment
Semiconductor optical amplifiers
Terahertz frequencies
Waveguides
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Summary:We propose and experimentally demonstrate a dual-wavelength distributed feedback (DFB) laser array utilizing a four-phase-shifted sampled Bragg grating. By using this grating, the coupling coefficient is enhanced by approximately 2.83 times compared to conventional sampled Bragg gratings. The devices exhibit a stable dual-mode lasing achieved by introducing further π-phase shifts at 1/3 and 2/3 positions along the cavity. These devices require only one stage of lithography to define both the ridge waveguide and the gratings, mitigating issues related to misalignment between them. A dual-wavelength laser array has been fabricated with frequency spacings of 320 GHz, 500 GHz, 640 GHz, 800 GHz, and 1 THz. When integrated with semiconductor optical amplifiers, the output power of the device can reach 23.6 mW. Furthermore, the dual-wavelength lasing is maintained across a wide range of injection currents, with a power difference of
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.524107