Chi-Hsiang Lin

National Yang Ming Chiao Tung University

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Chun-Ting Lin

National Yang Ming Chiao Tung University

Chia-Chien Wei

National Sun Yat-sen University

Sien Chi

Macronix International (Taiwan)

Jhih-Hao Hsu

National Sun Yat-sen University

Fumin Liu

Beijing Aerospace Flight Control Center

Liming Fang

Nanjing University of Aeronautics and Astronautics

Min Yu

National Sun Yat-sen University

Chun-Ting Lin

National Yang Ming Chiao Tung University

Lei Zhou

Huawei Technologies (China)

Hou-Tzu Huang

Corning (United States)

Cooperative Institutions

National Yang Ming Chiao Tung University

National Sun Yat-sen University

Yuan Ze University

Corning (United States)

National Taipei University of Technology

Guizhou University

Industrial Technology Research Institute

National Taiwan Ocean University

Ming Chi University of Technology

National Chi Nan University

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Delay Division Multiplexing DFT Spread FDMA PON by Sub-Nyquist Sampling Rate Receiver

Optical Fiber Communication Conference (2016)

Guangfu Bai Chun-Ting Lin Chi-Hsiang Lin Chun-Hung Ho Chia-Chien Wei

We propose time delay division DFT-S FDMA PON scheme. Each ONU can receive data by using ADCs of 1/2~1/32 Nyquist Sample Rate such that DFT and IDFT are unnecessary for de-mapping and picking out signals.

Nyquist–Shannon sampling theorem

Nyquist rate

Time-division multiplexing

Frequency-division multiple access

10.1364/ofc.2016.th3c.6

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APD-based delay-division-multiplexing OFDM-PONs

Jhih-Hao Hsu Min Yu Chia-Chien Chi-Hsiang Lin Chun-Ting Lin

Based on pre-allocated relative sampling delays among optical network users (ONUs) in an orthogonal frequency-division multiplexing (OFDM) passive optical network (PON), the delay-division-multiplexing (DDM) technique employs signal pre-processing to enable demand data to be received by sub-Nyquist analog-to-digital sampling. This work employed an avalanche photodiode (APD) in a DDM-OFDM-PON to achieve higher loss budget, compared to a p-i-n photodiode (PIN). To successfully enable the pre-processing, however, the knowledge of channel response is required; thus, it is critical to estimate complete channel response in DDM-OFDM systems under the constraint of sub-Nyquist sampling. To avoid spectral overlapping in channel estimation, the subcarriers of training symbols in different frequency zones are allocated to different time slots. Unfortunately, this scheme may sustain inaccurate channel estimation due to different degrees of APD saturation for training subcarriers at different frequency zones, leading to significant penalty in performance. Thus, careful control of electrical driving power and optical received power for the training symbols will be important to reduce the impact of saturation on channel estimation, thereby improving transmission performance. We experimentally examined the impact of the accuracy of channel estimation in a 25-Gbps APD-based OFDM-PON. Compared to a PIN, we successfully demonstrated the DDM scheme based on an APD and 1/32 of Nyquist rate with 5-dB improvement in sensitivity after 25-km fiber transmission.

Nyquist–Shannon sampling theorem

10.1109/wocc.2018.8373788

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Employing Hybrid sub-Nyquist Sampling Rates to Support Heterogeneous Services of Varying Capacity in 25-Gbps DDM-OFDM-PON

IEEE photonics journal (2018)

Jhih-Hao Hsu Min Yu Chia-Chien Wei Chi-Hsiang Lin Chun-Ting Lin

Delay-division-multiplexing (DDM) involves the use of signal preprocessing for the detection of data via sub-Nyquist analog-to-digital sampling, based on preallocated relative sampling delays among optical network users (ONUs) in an orthogonal frequency-division multiplexing (OFDM) passive optical network (PON). If a DDM-PON consists of M virtual groups, the sampling rate at the receivers is only 1/M of the Nyquist rate, but the maximum capacity of each ONU is fixed at 1/M of the total capacity. In this study, we developed a novel DDM scheme that uses hybrid sub-Nyquist sampling rates to accommodate heterogeneous services of different capacities in an OFDM-PON. To equalize the transmission performances using hybrid sub-Nyquist sampling rates, the modification of preprocessing was proposed, and its necessity was demonstrated. Without loss of generality, we experimentally demonstrated a 25-Gbps DDM-OFDM-PON using hybrid sampling at 1/2, 1/8, and 1/32 (or 1/8, 1/16, and 1/32) of the Nyquist rate. Compared to a DDM-PON with a fixed subNyquist rate, the received signals based on hybrid sub-Nyquist sampling rates show similar sensitivities. A loss budget of 26 dB was experimentally achieved using all sub-Nyquist sampling rates after employing the modified preprocessing.

Nyquist–Shannon sampling theorem

Nyquist rate

Nyquist frequency

10.1109/jphot.2018.2815619

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Citations (10)

Simple Receiving Scheme in 100-GHz DD OFDM RoF Systems Employing Low-Sampling-Rate ADCs and Digital Preprocess

Optical Fiber Communication Conference (2015)

Huan-Ching Liu Chi-Hsiang Lin Chun-Ting Lin Chia-Chien Wei Hou-Tzu Huang

A simple low-sampling-rate receiving scheme is proposed for W-band OFDM-RoF systems. Using the proposed preprocess, aliasing-free subcarriers can be received, and employing the optimized delays to ADCs can achieve the performance insensitive to sampling rate.

10.1364/ofc.2015.th2a.7

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Citations (6)

Hybrid Optical Wired/Coherent-Wireless OFDM Access Networks with Baseband Signal Modulation and Envelop-Detection Down-Conversion

Chiao-Wei Chen Hao-Hsiang Chang W. Chen Chien-Cheng Li Chi-Hsiang Lin

We propose hybrid optical wired/wireless access networks integrating fixed/mobile system. Tradeoff between strong carrier of EML modulation and nonlinearity is investigated. Hybrid access is achieved by employing commercial EML, envelop-detection down-conversion, and Volterra compensation.

Modulation (music)

SIGNAL (programming language)

10.1364/cleopr.2018.w2i.4

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Citations (1)

V-band Gapless OFDM RoF System with Power Detector Down-conversion and Novel Volterra Nonlinear Compensation

Optical Fiber Communication Conference (2016)

Shou-Chih Chiang Che-Hao Li Chun-Ting Lin Hou-Tzu Huang Chi-Hsiang Lin

V-band gapless OFDM RoF system with power detector down-conversion is proposed. We propose and successfully employ a novel Volterra nonlinear compensation to mitigate signal-to-signal beating interference, resulting in 22% data rate improvement with bit-loading algorithm.

Gapless playback

SIGNAL (programming language)

10.1364/ofc.2016.w1g.6

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Photodecomposition of Volatile Organic Compounds Using TiO₂ Nanoparticles

Journal of Nanoscience and Nanotechnology (2007)

Ching-Song Jwo Ho Chang Mu-Jnug Kao Chi-Hsiang Lin

This study examined the photodecomposition of volatile organic compounds (VOCs) using TiO2 catalyst fabricated by the Submerged Arc Nanoparticle Synthesis System (SANSS). TiO2 catalyst was employed to decompose volatile organic compounds and compare with Degussa-P25 TiO2 in terms of decomposition efficiency. In the electric discharge manufacturing process, a Ti bar, applied as the electrode, was melted and vaporized under high temperature. The vaporized Ti powders were then rapidly quenched under low-temperature and low-pressure conditions in deionized water, thus nucleating and forming nanocrystalline powders uniformly dispersed in the base solvent. The average diameter of the TiO2 nanoparticles was 20 nm. X-ray diffraction analysis confirmed that the nanoparticles in the deionized water were Anatase type TiO2. It was found that gaseous toluene exposed to UV irradiation produced intermediates that were even harder to decompose. After 60-min photocomposition, Degussa-P25 TiO2 reduced the concentration of gaseous toluene to 8.18% while the concentration after decomposition by SANSS TiO2 catalyst dropped to 0.35%. Under UV irradiation at 253.7 +/- 184.9 nm, TiO2 prepared by SANSS can produce strong chemical debonding energy, thus showing great efficiency, superior to that of Degussa-P25 TiO2, in decomposing gaseous toluene and its intermediates.

Nanocrystalline material

10.1166/jnn.2007.746

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Citations (5)

Effects of Generator Parameters and Transformer Disposal on Dynamics of a High-Penetration No-Storage Wind-Diesel System

Journal of Marine Science and Technology (2015)

Chi-Hsiang Lin

Diesel generator

10.6119/jmst-014-1204-1

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整合慣性感測元件之導波矽基光學平台研究;Optical Performance of Guided-Wave Silicon Optical Bench with Inertial Sensing Element