Browsing by Author "Wei, Chia-Chien"

Now showing 1 - 20 of 96

1.1-Gb/s White-LED-Based Visible Light Communication Employing Carrier-Less Amplitude and Phase Modulation
(2012-10-01)
Wu, Fang-Ming
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Lin, Chun-Ting
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Wei, Chia-Chien
;
Chen, Cheng-Wei
;
Huang, Hou-Tzu
We demonstrate 1.1-Gb/s visible light communication (VLC) employing carrier-less amplitude and phase modulation (CAP) and a commercially available phosphorescent white light emitting diode (LED). Optical blue filtering, pre-compensation, and decision feedback equalization are used to compensate the frequency response of the phosphor-based white LED. Various modulation orders of CAP signals are investigated to maximize the capacity of the VLC system. The record data rate of 1.1 Gb/s with the bit error rate performance below the FEC limit of 10(-3) is successfully achieved >23-cm air-transmission via a 220-MBaud 32-CAP signal.
100-GHz DD-OFDM-RoF system over 150-km fiber transmission employing pilot-aided phase noise suppression and bit-loading algorithm
(2014-02-24)
Huang, Hou-Tzu
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Liang, Wan-Ling
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Lin, Chun-Ting
;
Wei, Chia-Chien
;
Chi, Sien
This study extended the transmission distance of a 100-GHz DD-OFDM-RoF system through the reduction of chromatic dispersion-induced phase noise. The implementation of a pilot-aided phase noise suppression (PPNS) scheme enabled the transmission of distance-insensitive 16.97-Gbps QPSK OFDM over 0 similar to 150-km fiber and 2-m air transmission via a DFB laser with linewidth of 1 similar to 10-MHz. We applied a bit-loading algorithm in conjunction with PPNS to maximize spectral efficiency, resulting in a 93% improvement in the data rate from 11.53 to 22.27 Gbps at a fiber transmission of 150 km. (C) 2014 Optical Society of America
106-fJ/(bit.km) 2-km OFDM OM4 MMF Transmissions for Energy Efficient Optical Interconnects
(2013)
Lu, I-Cheng
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Chen, Hsing-Yu
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Wei, Chia-Chien
;
Shi, Jin-Wei
;
Tsai, Sheng-Fan
Employing high-performance 850-nm VCSELs with oxide-relief and Zn-diffusion structures, we demonstrate 17.8-Gbps 2-km OM4 fiber transmissions. Meanwhile, ultra-low EDDR of 106 fJ/(bit km) with bias current as low as 1.9 mA is achieved.
150-km 103-GHz Direct-Detection OFDM-RoF System Employing Pilot-aided Phase Noise Suppression
(2014-01-01)
Huang, Hou-Tzu
;
Liang, Wan-Ling
;
Wei, Chia-Chien
;
Lin, Chun-Ting
;
Chi, Sien
Pilot-aided phase noise suppression (PPNS) is employed to demonstrate distance-and linewidth-insensitive 103-GHz DD-OFDM-RoF systems. With 10.3-MHz linewidth, PPNS lowers BER of -6-dBm signal from >10(-2) to <10(-3) over 150-km fiber and 2-m wireless transmission.
2 x 2 MIMO OFDM-RoF System Employing LMS-Based Equalizer With I/Q Imbalance Compensation at 60 GHz
(2014-06-01)
Huang, Hou-Tzu
;
Shih, Po-Tsung
;
Lin, Chun-Ting
;
Cheng, Yu-Hsuan
;
Liang, Wan-Ling
Multiple-input-multiple-output (MIMO) technology is a promising method to increase spectral efficiency in wireless communications. In this paper, a 60-GHz orthogonal frequency-division multiplexing radio over fiber (OFDM-RoF) system employing 2 x 2 MIMO wireless technology is demonstrated. With the proposed equalizer employing least mean squares (LMS) algorithm, MIMO channel mixing and I/Q-mismatch can be compensated simultaneously. 16-QAM and 32-QAM OFDM signal transmissions under forward error correction (FEC) threshold (1 x 10(-3)) are demonstrated. A data rate of 76.3 Gb/s can be achieved with a bit-loading algorithm over 25-km fiber transmission and 3.5-m wireless transmission.
2 x 2 MIMO radio-over-fiber system at 60 GHz employing frequency domain equalization
(2012-01-02)
Lin, Chun-Ting
;
Ng'oma, Anthony
;
Lee, Wei-Yuan
;
Wei, Chia-Chien
;
Wang, Chih-Yun
This work experimentally demonstrates the efficacy of the 2 x 2 multiple-input multiple-output (MIMO) technique for capacity improvement of a 60-GHz radio-over-fiber (RoF) system employing single-carrier modulation format. We employ frequency domain equalization (FDE) to estimate the channel response, including frequency response of the 60 GHz RoF system and the MIMO wireless channel. Using FDE and MIMO techniques, we experimentally demonstrate the doubling the of wireless data capacity of a 60 GHz RoF system to 27.15 Gb/s using 16-QAM modulation format, with transmission over 25 km of standard single-mode fiber and 3 m wireless distance. (C) 2011 Optical Society of America
2.1-Tb/s.km OFDM Long-Reach PON Transmission using a Cost-Effective Electro-Absorption Modulator
(2011-01-01)
Hsu, Dar-Zu
;
Wei, Chia-Chien
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Chen, Hsing-Yu
;
Chen, Jyehong
;
Yuang, Maria C.
We experimentally demonstrate a superior performance of 2.1-Tb/s.km OFDM-signal transmission over 100-km long-reach PONs, which is achieved by using an EAM and direct-detection, and adopting the 128-QAM format and adaptive subcarrier power weighting.
2.5 dB sensitivity improvement by optimizing the driving voltage of an MZM and electrical filter bandwidth of optical duobinary transmission systems
(2006)
Lu, Yu-Chang
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Wei, Chia-Chien
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Chen, Jason (Jyehong)
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Tsao, Cheng
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Chi, Sien
We numerically and experimentally demonstrated that 100% driving voltage doesn't necessarily yield optimal results in duobinary systems. Compared with conventional condition, a 2.5 dB sensitivity improvement is obtained using 3 GHz LPFs with optimum voltage. (C) 2006 Optical Society of America.
20-Gbps WDM-PON Transmissions Employing Weak-resonant-cavity FPLD with OFDM and SC-FDE Modulation Formats
(2013-01-01)
Lu, I-Cheng
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Chen, Hsing-Yu
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Wei, Chia-Chien
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Chi, Yu-Chieh
;
Lee, Yi-Cheng
We experimentally demonstrate a superior performance of 20-Gbps OFDM/SC-FDE transmission over 20-km WDM-PONs, using a channelized weak-resonant-cavity FPLD with a modulation bandwidth of only 1.25 GHz by using injection-locking, direct detection and adopting the power-loading algorithm.
20-Gbps WDM-PON transmissions employing weak-resonant-cavity FPLD with OFDM and SC-FDE modulation formats
(2013-04-08)
Lu, I-Cheng
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Wei, Chia-Chien
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Jiang, Wen-Jr
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Chen, Hsing-Yu
;
Chi, Yu-Chieh
Using a colorless weak-resonant-cavity (WRC) FPLD injected by a centralized light source, we have experimentally demonstrated a superior performance of 20-Gbps uplink transmission in a WDM-PON. Even though the typical modulation bandwidth of a WRC-FPLD is only similar to 1.25 GHz, using spectrally-efficient 32-QAM OFDM or SC-FDE modulation, 20-Gbps uplink signals can achieve the FEC limit after 25-km dispersion-uncompensated single-mode fiber transmission. Because of the advantage of lower PAPR, the SC-FDE signals outperform the OFDM signals with the fixed 32-QAM format in the proposed system; moreover, SC-FDE scheme can be another promising candidate for uplinks in WDM-PONs, for its simplification to ONUs. The signal at the mode of 1560.7 nm shows similar quality with the signal at the modes of 1545.3 nm and 1574.7 nm, the WRC-FPLD, accordingly, has wide injection wavelength range from at least 1545.3 nm to 1574.7 nm. With the mode spacing of 0.55 nm, consequently, we have demonstrated the applicability of the colorless WRC-FPLD on supporting up to 36 channels in the WDM-PON. (C) 2013 Optical Society of America
21 Gb/s after 100 km OFDM long-reach PON transmission using a cost-effective electro-absorption modulator
(2010-12-20)
Hsu, Dar-Zu
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Wei, Chia-Chien
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Chen, Hsing-Yu
;
Chen, Jyehong
;
Yuang, Maria C.
We experimentally demonstrate a superior performance of 2.1-Tb/s.km OFDM signal transmission over 100-km long-reach PONs. While the bandwidth of a 100-km SMF transmission system is limited to 4.3 GHz due to positive chirp, we successfully achieve spectrally-efficient 21-Gb/s signaling by using a cost-effective and low-chirp EAM, and adopting the 128-QAM format and adaptive subcarrier pre-emphasis. (C)2010 Optical Society of America
224-Gbps Transmission for Next-Generation WDM Long-Reach PON Using CAP Modulation
(2016)
Chen, Kuan-Zhou
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Chen, Li-Wei
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Lin, Che-Yu
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Huang, Wan-Jou
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Wei, Chia-Chien
Leveraging high transmission bandwidth and loss budget provided by high launch power, we experimentally demonstrate 4-lambda 224-Gbps 32-CAP 60-km transmission using cost-effective 10-GHz-class EAM/PIN, supporting > 3-Gbps/ONU for a 64-ONU LR-PON, without inline and pre-amplifier.
3.22-Gb/s WDM Visible Light Communication of a Single RGB LED Employing Carrier-Less Amplitude and Phase Modulation
(2013)
Wu, Fang-Ming
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Lin, Chun-Ting
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Wei, Chia-Chien
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Chen, Cheng-Wei
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Chen, Zhen-Yu
We experimentally demonstrate WDM-VLC employing CAP modulation and commercially available RGB-type LED. The record aggregate data rate of 3.22 Gb/s with the BER of less than 10(-3) is successfully achieved over >25-cm air-transmission.
30-Gbps 100-km OFDM Transmission Using 10-GHz DML and Adiabatic-Chirp-Involved SSII Cancellation
(2016)
Cheng, Hsuan-Lin
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Wang, Yi-Hsiang
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Wei, Chia-Chien
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Chen, Jyehong
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光電工程學系
We experimentally verified the influences of adiabatic chirp on DML-based OFDM transmission, including fading and nonlinear distortion. Employing the proposed SSII cancellation, the capacity over 100-km transmission was increased by 55% to record-high 30 Gbps.
32-dB Loss Budget High-Capacity OFDM Long-Reach PON over 60-km Transmission without Optical Amplifier
(2014-01-01)
Wei, Chia-Chien
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Chen, Hsing-Yu
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Chu, Hsuan-Hao
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Chen, Yu-Chao
;
Song, Cih-Yuan
For the first time, 33-Gbps 60-km OFDM transmission is demonstrated to show 32-dB loss budget without inline and pre-amplifier. Employing 10-GHz EAM and PIN, the long-reach PON can economically support 32 ONUs with >1-Gbps/ONU capacity.
32.65-Gbps OFDM RoF Signal Generation at 60GHz Employing an Adaptive I/Q Imbalance Correction
(2010)
Jiang, Wen-Jr
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Lin, Chun-Ting
;
He, Li-Ying Wang
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Wei, Chia-Chien
;
Ho, Chun-Hung
We experimentally demonstrated an adaptive I/Q imbalance correction scheme to compensate I/Q-imbalance. With I/Q correction, a 32.65-Gbps OFDM signal at 60 GHz within 7-GHz license-free band is successfully generated and, following 25km SMF transmission, negligible power penalty is observed.
43.63-Gbit/s Multiple-User SC-FDMA PON With Sub-Nyquist Receiver and PAPR Reduction
(2018-10-01)
Lin, Chi-Hsiang
;
Fang, Ruei
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Lin, Chun-Ting
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Wei, Chia-Chien
;
Chi, Sien
In this letter, we propose a novel delay-division-multiplexing (DDM) scheme to enable SC-FDMA PON with a sub-Nyquist sampling rate ADC and lower PAPR, named time-interleaved FDMA (TI-FDMA). The proposed pre-processing method reduces the sampling rate of the ADC to 1/2 similar to 1/32 of the Nyquist sampling rate. The FFT size can be reduced to 1/32 (i.e., from 1024 to 32) due to lower sampling ratio and each user just needs to recover and demodulate their corresponding data without any additional DSP, which greatly reduces the complexity of the receiver. Meanwhile, the proposed TI-FDMA has lower PAPR than traditional localized FDMA (L-FDMA), interleaved FDMA (I-FDMA), and OFDM. Such the PAPR reduction makes TI-FDMA support the modulation format of 1 order higher compared to OFDM, thereby, leading to 12.5% capacity improvement. Employing the proposed scheme, up to 43.63-Gbps PON is experimentally demonstrated, and each of 32 users requires only 0.5-GSample/s ADC.
43.63-Gbit/s Multiple-User SC-FDMA PON with sub-Nyquist Receiver and PAPR Reduction
(2018-01-01)
Chang, Hao-Hsiang
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Lin, Chi-Hsiang
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Fang, Ruei
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Lin, Chun-Ting
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Wei, Chia-Chien
We demonstrate 43.63-Gbps SC-FDMA with 0.5-GSample/s sampling-rate receiver (1/32 Nyquist sampling rate) for each 32-user, which was experimentally demonstrated in commercial optical transmitter and receiver. A brief introduction of traditional SC-FDMA including L-FDMA and I-FDMA is contained. Meanwhile, a PAPR reduction is included in the proposed SC-FDMA system. The method of PAPR reduction makes the PAPR of SC-FDMA be isolated with the number of users and be lower than that of OFDM over 1-dB. Compared to OFDM, such reduction enables SC-FDMA to carry higher-order modulation format, achieving 12.5% capacity improvement (i.e. increases from 37.76 Gbit/s to 43.63 Gbit/s). Moreover, receivers' FFT size will be reduce to 1/32 of that in conventional SC-FDMA. We also compare results with L-FDMA, I-FDMA, and OFDM utilizing high sampling-rate ADC.
5-bit/s/Hz 50-Gbps W-band Optical/Wireless System Employing Single-Sideband Single-Carrier Modulation
(2014-01-01)
Ho, Chun-Hung
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Cheng, Yu-Hsuan
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Huang, Hou-Tzu
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Lin, Chun-Ting
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Wei, Chia-Chien
We experimentally demonstrate W-band radio-over-fiber system employing single-sideband single-carrier modulation with lower PAPR than OFDM. Up to 50-Gbps wireless transmission with the highest spectral efficiency of 5-bit/s/Hz at 103GHz can be achieved over 25-km fiber.
50-Gbps 100-km EAM-based OFDM-IMDD Transmission Employing Novel SSII Cancellation
(2014-01-01)
Chen, Hsing-Yu
;
Wei, Chia-Chien
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Chen, Yu-Chao
;
Chu, Hsuan-Hao
;
Song, Cih-Yuan
We build a new SSII cancellation technique to compensate both modulator nonlinearity and dispersion-induced nonlinear distortion. Employing the SSII cancellation to optimize EAM operation, superior 50-Gbps EAM-based OFDM-IMDD transmission over 100-km SSMF is successfully demonstrated.