Browsing by Author "Chen, J."

Now showing 1 - 12 of 12

Adaptive 84.44-190 Mbit/s phosphor-LED wireless communication utilizing no blue filter at practical transmission distance
(2014-04-21)
Yeh, C. H.
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Chow, C. W.
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Chen, H. Y.
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Chen, J.
;
Liu, Y. L.
We propose and experimentally demonstrate a white-light phosphor-LED visible light communication (VLC) system with an adaptive 84.44 to 190 Mbit/s 16 quadrature-amplitude-modulation (QAM) orthogonal-frequency-division-multiplexing (OFDM) signal utilizing bit-loading method. Here, the optimal analogy pre-equalization design is performed at LED transmitter (Tx) side and no blue filter is used at the Rx side. Hence, the similar to 1 MHz modulation bandwidth of phosphor-LED could be extended to 30 MHz. In addition, the measured bit error rates (BERs) of < 3.8 x 10(-3) [forward error correction (FEC) threshold] at different measured data rates can be achieved at practical transmission distances of 0.75 to 2 m. (C) 2013 Optical Society of America
Demonstration of an optical FIFO multiplexer
(2008-01-01)
Feng, K-M.
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Wu, C. -Y.
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Hsueh, D. -H.
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Ku, C. -S.
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Chang, C. -P.
A novel 2-to-1 optical FIFO multiplexer under a simple packet routing policy, with maximum buffer size 2((n-2))-1, is proposed and experimentally demonstrated using an nxn AWG, wavelength converters and fiber delay lines at 10 Gbps. (c) 2008 Optical Society of America.
Equalization of PAM-4 Signal Generated by Silicon Microring Modulator for 64-Gbit/s Transmission
(2017-11-15)
Tzu, T. C.
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Hsu, Y.
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Chuang, C. Y.
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Wu, X.
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Chow, C. W.
We propose and demonstrate a 64-Gbit/s four-level pulse-amplitude-modulation transmission by using a limited modulation bandwidth silicon microring modulator (SiMRM) and the Volterra equalization scheme. Severe intersymbol interference caused by both the chromatic dispersion of the optical fiber and the bandwidth limitation of components can be compensated. Besides, several equalization schemes are compared and analyzed in terms of performance and complexity. In addition, the design and characteristics of the SiMRM used in the experiment are also discussed.
Fast and slow light property improvement in erbium-doped amplifier
(2013-01-01)
Peng, P. C.
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Wu, F. K.
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Kao, W. C.
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Chen, J.
;
Lin, C. T.
This work experimentally demonstrates improvement of the fast light property in erbium-doped amplifiers at room temperature. The difference between the signal power and the pump power associated with bending loss is used to control the signal power at the different positions of the erbium-doped fiber (EDF) to improve the fast light property. Periodic bending of the EDF increases the time advance of the probe signal by over 288%. Additionally, this concept also could improve the fast light property using coherent population oscillations in semiconductor optical amplifiers.
High-Speed Phosphor-LED Wireless Communication System Utilizing No Blue Filter
(2014-01-01)
Yeh, C. H.
;
Chow, C. W.
;
Chen, H. Y.
;
Chen, J.
;
Liu, Y. L.
In this paper, we propose and investigate an adaptively 84.44 to 190 Mb/s phosphor-LED visible light communication (VLC) system at a practical transmission distance. Here, we utilize the orthogonal-frequency-division-multiplexing quadrature-amplitude-modulation (OFDM-QAM) modulation with power/bit-loading algorithm in proposed VLC system. In the experiment, the optimal analogy pre-equalization design is also performed at LED-Tx side and no blue filter is used at the Rx side for extending the modulation bandwidth from 1 MHz to 30 MHz. In addition, the corresponding free space transmission lengths are between 75 cm and 2 m under various data rates of proposed VLC. And the measured bit error rates (BERs) of < 3.8x10(-3) [forward error correction (FEC) limit] at different transmission lengths and measured data rates can be also obtained. Finally, we believe that our proposed scheme could be another alternative VLC implementation in practical distance, supporting > 100 Mb/s, using commercially available LED and PD (without optical blue filtering) and compact size.
Novel Electromagnetic Targeting System for Navigating Surgery in Endobronchoscopy
(2018-01-01)
Chen, C.
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Lin, C.
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Cheng, Y.
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Chung, T.
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Chang, C.
Optical Vector Signal Generation Using Double Sideband with Carrier Suppression and Frequency Multiplication
(2008)
Lin, C. T.
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Jiang, W. J.
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Wong, E. Z.
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Chen, J.
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Shih, P. T.
This work experimentally demonstrates optical vector signal generation using frequency multiplication based on double sideband with carrier suppression. After transmission over 50-km SMF, the power penalty of 15-GHz 1.25-Gb/s RF signals is less than 0.2-dB. (C)2008 Optical Society of America
Polarization-insensitive, 40 Gb/s wavelength and RZ-OOK-to-RZ-BPSK modulation format conversion by XPM in a highly nonlinear PCF
(2008-08-04)
Astar, W.
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Wei, C. -C.
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Chen, Y. -J.
;
Chen, J.
;
Carter, G. M.
Polarization-insensitive wavelength conversion, as well as the conversion of return-to-zero (RZ) ON-OFF keying (RZ-OOK) to RZ binary phase-shift keying (RZ-BPSK), has been simultaneously achieved at 40 Gb/s for the first time by cross-phase modulation (XPM) in a highly birefringent, nonlinear photonic crystal fiber (PCF). A 10(-9)-BER receiver sensitivity conversion penalty of < 3 dB was achieved for a polarization scrambled, 40 Gb/s 25%-RZ-OOK pump, when the 40 Gb/s RZ probe was launched at 45 degrees with respect to the birefringence axes of the PCF and when the pump-probe detuning was greater than about 6 nm. (C) 2008 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.
Theoretical investigation of polarization-insensitive data format conversion of RZ-OOK to RZ-BPSK in a nonlinear birefringent fiber
(2009-03-16)
Wei, C. C.
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Astar, W.
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Chen, J.
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Chen, Y. -J.
;
Carter, G. M.
Polarization-insensitive conversion of return-to-zero (RZ) ON-OFF keying (RZ-OOK) to RZ binary phase-shift keying (RZ-BPSK) has been achieved by cross-phase modulation (XPM) in a nonlinear birefringent fiber. This work presents a theoretical analysis of the dependence of format conversion on pump-probe detuning, and the pump state-of-polarization (SOP) that can fluctuate unpredictably in a realistic system. An investigation of the impact of pump polarization fluctuation on receiver sensitivity and receiver optimal threshold for the converted RZ-BPSK probe is also carried out. It was found that although the desired XPM-induced pi phase shift can be achieved by launching both the RZ-OOK pump and the probe along the same birefringent axis of the fiber, the phase shift degrades to pi/3 the SOP of the RZ-OOK pump unpredictably switches to the other axis of the fiber, resulting in a large receiver sensitivity penalty fluctuation of 14 dB. By contrast, launching the probe at 45 degrees relative to the birefringent axes can reduce the polarization-dependent receiver sensitivity penalty fluctuation to about 2 dB as the SOP of the RZ-OOK pump is swept over the Poincare sphere. These conclusions are in good agreement with recently published experimental results. (C) 2009 Optical Society of America
Transmission Performance Improvement of PAM-4 Signal Direct-Detected by Ge-Si Photodiode using Volterra Equalization
(2017-01-01)
Hsu, Y.
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Chuang, C. Y.
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Chen, G. H.
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Chang, Y. C.
;
Wu, X.
We demonstrate a 4-level pulse-amplitude-modulation (PANT-4) transmission system direct-detected by germanium-silicon (Ge-Si) photodiode (PD). Volterra-equalization is used to compensate signal distortion and 40-Gibt/s and 50-Gbit/s PANT-4 signals after 20-km and 10-km fiber transmissions are achieved.
Using Injection-Locked Fabry-Perot Laser Diode with 10% Frond-Facet Reflectivity for 10 Gbps Upstream PON Access
(2013)
Yeh, C. H.
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Chen, H. Y.
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Chow, C. W.
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Liu, Y. L.
;
Chen, J.
We demonstrate a 10-Gbit/s upstream 16-QAM OFDM signal transmission using injection-locked Fabry-Perot laser diode with 10% frond-facet reflectivity for the long-reach PON access. Moreover, the relationship of BER and injection power is also analyzed.