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16:00 - 16:15
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Manuscript ID. 0339
Paper No. 2023-SAT-S0305-O001
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| Tzu-En Yen
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Quantum Key Distribution Using Master-to-Slave Injection-Locked O-band DFBLD with Differential Phase Shift Protocol
Cheng-Lin Tsou, Tzu-En Yen, National Taiwan University (Taiwan); Chih-Hsien Cheng, National Institute of Information and Communications Technology (Japan); Gong-Ru Lin, National Taiwan University (Taiwan), Tektronix Inc. and National Taiwan University (Taiwan)
The QKD with a DPS protocol at O-band is performed by employing a master-DFBLD to injection-lock a slave-DFBLD at almost identical wavelength. With the stabilization the master wavelength at 1308.4 nm for 10-min, the 1-bit delayed-interferometric decoding of the secure single-photon QKD codes with DPS states switched between 0 to pi is performed. By adding a small bias change under Ipp of 0.15mA or Vpp of 60 mV with corresponding wavelength of 0.6 pm (=phase change to pi) can be converted to on-off-keying format for QKD decryption with a QBER of 30% at a data rate of 1 Mbit/s.
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16:15 - 16:30
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Manuscript ID. 0752
Paper No. 2023-SAT-S0305-O002
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| Chin-Hao Tseng
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Generation of sub-THz signals using two semiconductor lasers with highly asymmetric mutual coupling
Chin-Hao Tseng, Bin-Kai Liao, Sheng-Kwang Hwang, National Cheng Kung University (Taiwan)
This research proposes a novel all-optical sub-THz signal generation based on period-one dynamics of two mutually coupled semiconductor lasers under highly asymmetric coupling strength. As a result, the generation of sub-THz signals ranging from 100 to 300 GHz with similar good phase quality, including a 3-dB linewidth below 2 kHz and a side-peak suppression ratio of about 46 dB, is achieved all-optically.
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16:30 - 16:45
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Manuscript ID. 0671
Paper No. 2023-SAT-S0305-O003
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| Hsu-Ting Tang
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Cascaded injection of semiconductor lasers in Period-one nonlinear dynamic for optical frequency comb generation
Hsu-Ting Tang, Department of Photonics (Taiwan); Yu-Han Hung, Department of Photonics (Taiwan), Miniaturized Photonic Gyroscope Research Center (Taiwan)
The study focuses on stabilizing subharmonic nonlinear dynamics in semiconductor lasers for optical frequency comb (OFC) generation. The proposed system consists of two cascaded optical injection stages. By injecting the first stage with proper power and frequency, period-one (P1) dynamics are invoked, then leading P1 dynamic injection into the second stage. With adjusted power in the second stage, undamped relaxation oscillations trigger subharmonic nonlinear dynamics. This achieves OFC generation with subharmonic oscillation sidebands, generating over 15 comb lines, and a bandwidth greater than 140 GHz. We have also proposed a cascaded injection-locking scheme to improve microwave comb signal quality.
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16:45 - 17:00
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Manuscript ID. 0322
Paper No. 2023-SAT-S0305-O004
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| Katsumoto Ikeda
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Full vectorial simulation of VCSEL devices using a self-consistent MQW solver and the FDTD method
Manuel Mendez, Priscila Romagnoli, Ansys Japan (Japan); Bozidar Novakovic, Ansys Canada (Canada); Katsumoto Ikeda, Ansys Japan (Japan)
In this work, we demonstrate a workflow to simulate VCSEL and SOA devices. The electronic part is calculated using a self-consistent MQW solver, the optical section of the device is solved using the FDTD method and the thermal model with a Joule heating solver. The connection between MQW and FDTD is achieved by implementing a current driven model in FDTD that allows for solving the rate equations using the fitted MQW data. Additionally, the heat distribution of the cavity can be used in the FDTD solver. With this workflow we can calculate the I-V and I-L curves of the VCSEL.
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