Demonstration of a directly modulated laser achieving bandwidth exceeding 50 GHz with an integrated active feedback waveguide

Dechao Ban; Jia Chen; Ya Jin; Renheng Zhang; Keqi Cao; Jian Wang; Bei Chen; Yu Liu; Jinhua Bai; Mengbo Fu; Ming Li; Ninghua Zhu

doi:10.1364/PRJ.529799

Photonics Research, Volume. 12, Issue 12, 2855(2024)

Demonstration of a directly modulated laser achieving bandwidth exceeding 50 GHz with an integrated active feedback waveguide

Dechao Ban¹, Jia Chen^1,2, Ya Jin^1、*, Renheng Zhang^1,2, Keqi Cao^1,2, Jian Wang^1,2, Bei Chen¹, Yu Liu¹, Jinhua Bai¹, Mengbo Fu³, Ming Li¹, and Ninghua Zhu^1,4

Author Affiliations

¹Key Laboratory of Optoelectronic Materials and Devices, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

²Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100083, China

³Communication and Integrated Photonics Laboratory, Xiongan Institute of Innovation, Chinese Academy of Sciences, Xiongan 071899, China

⁴Institute of Intelligent Photonics, Nankai University, Tianjin 300071, China

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Figures & Tables(7)

Fig. 1. (a) Structure of PCG-AFDFB. (b) Unit of transmission matrix.

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Fig. 2. (a) Simulated in-cavity etalon profile. (The red circle represents the lasing mode, and the blue rectangle represents the PPR mode.) FRS versus (b) different reflectivity r2, (c) different κ, (d) different rate of LM at 450 μm cavity length, (e) different LF, and (f) different LM. (In the legend, the former and latter numbers represent the LM and LF, respectively.)

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Fig. 3. Laser-A: (a) L-I curve at IF=0 mA to 10 mA, (b) S21 at different IM with IF=10 mA, (c) spectra at different IF with IM=55 mA, and (d) S21 at different IF with IM=55 mA.

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Fig. 4. Laser-B: (a) spectra at different IM with IF=5 mA and (b) S21 at different IM with IF=5 mA. Laser-C: (c) spectra at different IM with IF=5 mA and (d) S21 at different IM with IF=5 mA.

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Fig. 5. Laser-D: (a) spectra at IM=50 mA and 60 mA with IF=5 mA and 10 mA, (b) S21 at IM=50 mA and 60 mA with IF=5 mA and 10 mA, (c) spectra at IM=70 mA with IF=0 mA and 3 mA, and (d) S21 at IM=70 mA with IF=0 mA and 3 mA.

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Fig. 6. Eye diagram of (a) 45 Gbps NRZ BtB, (b) 55 Gbps NRZ BtB, (c) 60 Gbps PAM4 BtB, and (d) 70 Gbps PAM4 BtB.

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Table 1. Structural Parameters of Four PCG-AFDFBs
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Table 1. Structural Parameters of Four PCG-AFDFBs
Waveguide Lengths (μm) Grating
Laser Type $L_{total}$ $L_{M}$ $L_{F}$ Length (μm) Duty Cycle
A 450 150 300 90 0.75
B 450 200 250 100 0.50
C 450 200 250 120 0.75
D 500 200 300 80 0.50

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Dechao Ban, Jia Chen, Ya Jin, Renheng Zhang, Keqi Cao, Jian Wang, Bei Chen, Yu Liu, Jinhua Bai, Mengbo Fu, Ming Li, Ninghua Zhu, "Demonstration of a directly modulated laser achieving bandwidth exceeding 50 GHz with an integrated active feedback waveguide," Photonics Res. 12, 2855 (2024)

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