Prof. Sheng-Kwang Hwang Profile

Prof. Sheng-Kwang Hwang

SPIE Involvement:

Author

Area of Expertise:

semiconductor laser , nonlinear dynamics , optical communications , microwave photonics

Publications (11)

SPIE Journal Paper | 17 April 2018

Measurement of ambient vibration by self-mixing interferometry and its application to intrusion detection

Silvano Donati, Giuseppe Martini, Sheng-Kwang Hwang

OE, Vol. 57, Issue 05, 051508, (April 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.5.051508

KEYWORDS: Analog electronics, Sensors, Interferometry, Signal detection, Signal processing, Switching, Semiconductor lasers, Computer intrusion detection, Photodiodes, Linear filtering

Read Abstract +

Proceedings Article | 25 February 2016 Paper

Highly efficient local-oscillator-free photonic microwave down-converters based on period-one nonlinear dynamics of semiconductor lasers

Yu-Han Hung, Sheng-Kwang Hwang

Proceedings Volume 9747, 974718 (2016) https://doi.org/10.1117/12.2212952

KEYWORDS: Microwave radiation, Semiconductor lasers, Microwave photonics, Photonic microstructures, Nonlinear dynamics, Modulation, Oscillators, Photodetectors, Nonlinear optics, Spectrum analysis

Read Abstract +

Proceedings Article | 5 September 2014 Paper

Generation of an octave-spanning supercontinuum in highly nonlinear fibers pumped by noise-like pulses

Shih-Shian Lin, Sheng-Kwang Hwang, Jia-Ming Liu

Proceedings Volume 9198, 919816 (2014) https://doi.org/10.1117/12.2061258

KEYWORDS: Optical fibers, Fiber amplifiers, Supercontinuum generation, Fiber lasers, Polarization, Picosecond phenomena, Optical amplifiers, Pulsed laser operation, Femtosecond phenomena, Temporal coherence

Read Abstract +

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

Read Abstract +

Proceedings Article | 18 August 2010 Paper

Four-wave mixing of strongly injection-locked semiconductor lasers for all-optical frequency conversion

Sheng-Kwang Hwang, Shin-Hung Tsai

Proceedings Volume 7781, 778109 (2010) https://doi.org/10.1117/12.860654

KEYWORDS: Frequency conversion, Data conversion, Four wave mixing, Semiconductor lasers, Modulation, Optical amplifiers, Wavelength division multiplexing, Semiconductor optical amplifiers, Signal to noise ratio, Frequency converters

Read Abstract +

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

Read Abstract +

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

All-optical frequency conversion using nonlinear dynamics of semiconductor lasers subject to external optical injection

Sheng-Kwang Hwang, Che-Yang Lin, Dian-Hao Liang

Proceedings Volume 6997, 69970J (2008) https://doi.org/10.1117/12.781218

KEYWORDS: Frequency conversion, Semiconductor lasers, Optical filters, Nonlinear dynamics, Electronic filtering, Optical communications, Frequency converters, Modulation, Laser systems engineering, Telecommunications

Read Abstract +

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

Read Abstract +

Proceedings Article | 20 December 2004 Paper

Reduction of harmonic distortion in injection-locked semiconductor lasers

Sheng Kwang Hwang, Jia Ming Liu, J. Kenton White

Proceedings Volume 5577, (2004) https://doi.org/10.1117/12.567459

KEYWORDS: Distortion, Modulation, Semiconductor lasers, Resonance enhancement, Stereolithography, Wave plates, Analog electronics, Laser applications, Beam splitters, Spectrum analysis

Read Abstract +

Proceedings Article | 18 June 2004 Paper

Period-one oscillations in optically injected semiconductor lasers

Sheng Kwang Hwang, Jia Ming Liu, J. Kenton White

Proceedings Volume 5349, (2004) https://doi.org/10.1117/12.529569

KEYWORDS: Semiconductor lasers, Laser optics, Modulation, Laser systems engineering, Chaos, Stereolithography, Spectrum analysis, Laser applications, Wave plates, Beam splitters

Read Abstract +

Proceedings Article | 12 June 2002 Paper

Chirp reduction and bandwidth enhancement for direct current modulation in an optically injected semiconductor laser

Sheng-Kwang Hwang, Yuichiro Okajima, Jiaming Liu

Proceedings Volume 4646, (2002) https://doi.org/10.1117/12.470549

KEYWORDS: Modulation, Semiconductor lasers, Optical communications, Laser optics, Telecommunications, Optical fibers, Laser systems engineering, Stereolithography, Spectrum analysis, Resonance enhancement

Read Abstract +

Showing 5 of 11 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years