Prof. Sze-Chun Chan Profile

Prof. Sze-Chun Chan

Professor at City Univ of Hong Kong

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Publications (8)

Proceedings Article | 20 June 2024 Presentation + Paper

Coherent approaches on chaotic semiconductor lasers for dimensional enhancement

Jingya Ruan, Luan Zhang, Sze-Chun Chan

Proceedings Volume 13002, 130020N (2024) https://doi.org/10.1117/12.3022916

KEYWORDS: Homodyne detection, Semiconductor lasers, Chaos, Laser frequency, Signal detection, Principal component analysis, Optical coherence, Continuous wave operation, Simulations

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Proceedings Article | 4 March 2016 Paper

Randomness extraction from a chaotic laser diode with dispersive self-injection

Song-Sui Li, Xiao-Zhou Li, Jun-Ping Zhuang, Sze-Chun Chan

Proceedings Volume 9742, 97420C (2016) https://doi.org/10.1117/12.2214841

KEYWORDS: Semiconductor lasers, Chaos, Feedback, Chromium, Fiber Bragg gratings, Picosecond phenomena, Mirrors, Coherence (optics), Linear filtering, Reflectivity, Dispersion

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Proceedings Article | 29 November 2012 Paper

40-Gbps random bit generation by oversampling chaos from an injected semiconductor laser

Xiao-Zhou Li, Sze-Chun Chan

Proceedings Volume 8552, 85520K (2012) https://doi.org/10.1117/12.999791

KEYWORDS: Semiconductor lasers, Chaos, Oscilloscopes, Laser optics, Numerical simulations, Light emitting diodes, Photodetectors, Optical amplifiers, Standards development, Laser damage threshold

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Proceedings Article | 15 May 2012 Paper

Conversion between optical ASK and optical FSK using nonlinear dynamics of semiconductor lasers

Sheng-Kwang Hwang, Sze-Chun Chan, Shiuan-Li Lin, Cheng-Hao Chu, Yu-Han Hung

Proceedings Volume 8432, 843210 (2012) https://doi.org/10.1117/12.922878

KEYWORDS: Amplitude shift keying, Frequency shift keying, Semiconductor lasers, Modulation, Nonlinear optics, Laser optics, Nonlinear dynamics, Frequency conversion, Signal to noise ratio, Eye

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Proceedings Article | 27 April 2010 Paper

Direct modulation of stably injection-locked semiconductor lasers for photonic microwave transmission

Sheng-Kwang Hwang, Sze-Chun Chan, Shie-Chin Hsieh, Cheng-Yu Li

Proceedings Volume 7720, 77200V (2010) https://doi.org/10.1117/12.854414

KEYWORDS: Microwave radiation, Modulation, Semiconductor lasers, Radio optics, Microwave photonics, Photonic microstructures, Single sideband modulation, Laser optics, Double sideband modulation, Singular optics

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Photonic transmission of microwave signals from a central office to remote base stations is a key functionality in broadband radio-over-fiber access networks. Because of chromatic dispersion, a strong fluctuation of the microwave power along fiber transmission happens to microwave-modulated optical carriers with double-sideband features. Therefore, optical single-sideband modulation characteristics are preferred. Direct modulation of a semiconductor laser is the simplest scheme for photonic microwave generation and transmission. However, the symmetric property of the laser in the modulation sideband intensity makes the scheme unattractive for radio-over-fiber applications. In this study, we apply the injection locking technique to the laser for optical single-sideband generation. Proper optical injection can drive the laser to the stable-locking dynamical state before entering the Hopf bifurcation. The field-carrier coupling of the injected laser is radically modified due to the dynamical interaction between the injection-shifted cavity resonance and the injection-imposed oscillation. Therefore, the relaxation resonance sidebands of the injected laser are considerably shifted in frequency and asymmetrically modified in intensity, the extent of which depends strongly on the injection condition. Under the range of our study, direct modulation of the injected laser can thus generate microwave signals that are broadly tunable up to 4 times its free-funning relaxation resonance frequency and are highly asymmetric up to 20 dB in modulation sidebands. The microwave frequency can be tuned over a broad range while keeping a similar level of modulation sideband asymmetry, or different levels of modulation sideband asymmetry can be obtained while keeping a similar microwave frequency. This adds the flexibility and re-configurability to the proposed system. No optical phase-locking electronics, no high driving voltages, and no narrow-bandwidth optical filters are necessary as in many other systems.

Proceedings Article | 8 May 2008 Paper

Frequency division multiplexed radio-over-fiber transmission using an optically injected laser diode

Sze-Chun Chan

Proceedings Volume 6997, 69971Y (2008) https://doi.org/10.1117/12.781638

KEYWORDS: Microwave radiation, Modulation, Fused deposition modeling, Semiconductor lasers, Radio over Fiber, Laser optics, Photodiodes, Radio optics, Multiplexing, Nonlinear dynamics

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Proceedings Article | 12 February 2007 Paper

Dual-frequency multifunction lidar

Rosemary Diaz, Sze-Chun Chan, Jia-Ming Liu

Proceedings Volume 6457, 64570O (2007) https://doi.org/10.1117/12.699822

KEYWORDS: Microwave radiation, Doppler effect, Velocity measurements, LIDAR, Semiconductor lasers, Ranging, Signal detection, Photodiodes, Laser optics, Target detection

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Proceedings Article | 7 February 2007 Paper

Radio-over-fiber transmission from an optically injected semiconductor laser in period-one state

Sze-Chun Chan, Sheng-Kwang Hwang, Jia-Ming Liu

Proceedings Volume 6468, 646811 (2007) https://doi.org/10.1117/12.699170

KEYWORDS: Microwave radiation, Semiconductor lasers, Laser optics, Single sideband modulation, Radio optics, Radio over Fiber, Modulation, Dispersion, Microwave photonics, Double sideband modulation

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Showing 5 of 8 publications

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