Browsing by Author "Wu, F. M."

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40 GHz Phase Shifter based on Semiconductor Laser
(2008-04-10)
Peng, P. C.
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Wu, F. M.
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Lin, C. T.
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Chen, J. H.
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Kao, W. C.
This investigation experimentally demonstrates a 40 GHz phase shifter based on a semiconductor laser. The phase shift is achieved by adjusting the bias current and wavelength detuning. The device has an optical delay of 23 ps and a phase shift of about 331 degrees.
Electrically Controlled Phase Shifter using Semiconductor Laser in Optical Single Sideband System
(2009)
Wu, F. M.
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Peng, P. C.
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Yeh, S. K.
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Lin, C. T.
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Chen, J. H.
This investigation experimentally explores a microwave phase shifter using a semiconductor laser in an optical single sidebancl system. The operational bandwidth from 12 to 20 GHz is achieved by adjusting the bias current.
Performance Comparison of OFDM Signal and CAP Signal Over High Capacity RGB-LED-Based WDM Visible Light Communication
(2013-08-01)
Wu, F. M.
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Lin, C. T.
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Wei, C. C.
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Chen, C. W.
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Chen, Z. Y.
We experimentally demonstrate a visible light communication (VLC) system based on a single commercially available RGB-type LED. High spectrally efficient carrier-less amplitude and phase (CAP) modulation and orthogonal frequency-division multiplexing (OFDM) are adopted in the intensity-modulation and direct-detection VLC system of limited bandwidth. In order to achieve higher capacity of the uneven-frequency-response LED-based VLC system, OFDM signals are combined with the bit-and power-loading techniques, and CAP signals of various modulation are pre-emphasized to modulate one of the RGB chips. To reach the BER of less than 10(-3), CAP and OFDM signals demonstrate the maximum data rates of 1.32 and 1.08 Gb/s, respectively, employing the blue chip. In addition to spectrally efficient formats, the wavelength-division-multiplexing (WDM) scheme is applied to further increase the capacity. After individually optimizing RGB chips, the maximum aggregate data rates of CAP and OFDM are 3.22 and 2.93 Gb/s, respectively, in our RGB-LED-based WDM VLC system. Hence, compared with OFDM, the CAP scheme shows competitive performance and provides an alternative spectrally efficient modulation for next generation optical wireless networks.
Polarization Switching in 1.3-mu m Quantum Dot Vertical Cavity Surface Emitting Lasers
(2009)
Wu, F. M.
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Lan, R. L.
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Peng, P. C.
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Huang, C. C.
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Peng, R. Y.
This work for the first time, experimentally demonstrates the polarization switching in 1.3 mu m quantum dot VCSEL. The polarization switching in quantum dot VCSEL is achieved by adjusting the optical injection power. (C)2009 Optical Society of America
SOA-based fiber ring laser use in a photonic radio-frequency phase shifter
(2011-03-01)
Wu, F. M.
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Peng, P. C.
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Chen, J.
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Lin, C. T.
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Kao, W. C.
This investigation demonstrates the feasibility of a semiconductor optical amplifier (SOA)-based fiber ring laser use in a photonic radio-frequency (RF) phase shifter. Experimental results indicate that a fiber ring laser can successfully replace an external pump laser in a photonic RF phase shifter. The RF phase shifter can be turned by adjusting the power of the fiber ring laser.
Tunable Slow Light in Quantum Well Vertical-Cavity Surface-Emitting Laser at 40 GHz
(2008)
Peng, P. C.
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Wu, F. M.
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Lin, C. T.
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Chen, J. H.
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Shih, P. T.
This investigation experimentally demonstrates tunable slow fight in a quantum well vertical-cavity surface-emitting laser at 40 GHz. Tunable optical delays are achieved by adjusting the bias current and wavelength detuning. (C) 2008 Optical Society of America