Browsing by Author "Yeh, Chien Hung"

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C plus L band wavelength division multiplexing access network with distributed-controlled protection architecture
(2011-12-01)
Yeh, Chien Hung
;
Chow, Chi Wai
;
光電工程學系
;
Department of Photonics
In this work, we propose and experimentally demonstrate a novel distributed-controlled protection architecture for automatic and fast network restoration in wavelength division multiplexing-passive optical network (WDM-PON). The proposed scheme can support both C and L bands. Besides, duplication of network equipments, such as optical networking unit (ONU) or optical line terminal, is not required. In this distributed-controlled system, each ONU can always keep track of the network status. Hence, this can facilitate the network manage by removing the work loads from the central office. Besides, the proposed scheme can tolerate simultaneous fiber cuts in the feeder and distributed fibers. (C) 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.3658759]
Cost-effective wavelength-tunable fiber laser using self-seeding Fabry-Perot laser diode
(2008-01-07)
Yeh, Chien Hung
;
Shih, Fu Yuan
;
Wang, Chia Hsuan
;
Chow, Chi Wai
;
Chi, Sien
We propose and experimentally demonstrate a continuous wave (CW) tunable-wavelength fiber laser using self-seeding Fabry-Perot laser diode (FP-LD) without optical amplifier inside gain cavity. By employing a tunable bandpass filter (TBF) and a fiber reflected mirror (FRM) within a gain cavity, the fiber laser can lase a single-longitudinal wavelength due to the self-seeding operation. The proposed tunable wavelength laser has a good performance of the output power (> -15 dBm) and optical side-mode suppression ratio (> 40 dB) in the wavelength tuning range of 1533.75 to 1560.95 nm. In addition, the output stabilities of the fiber laser are also investigated. (c) 2007 Optical Society of America.
Rayleigh Backscattering Mitigation Using Wavelength Splitting for Heterogeneous Optical Wired and Wireless Access
(2010-09-01)
Chow, C. W.
;
Yeh, Chien Hung
;
Xu, Lin
;
Tsang, Hon Ki
;
光電工程學系
We propose and demonstrate a heterogeneous optical access network using wavelength-splitting at remote-node to mitigate the Rayleigh backscattering (RB) noises. Two continuous-wave carriers are generated from each laser for wired and wireless applications, respectively. Results show that the scheme can effectively mitigate RB noises.
Reliable tree-type passive optical networks with self-restorable apparatus
(2008-03-31)
Yeh, Chien Hung
;
Shih, Fu-Yuan
;
Chang, Gee-Kung
;
Chi, Sien
;
光電工程學系
We propose and investigate a simply self-restored tree-type time-division-multiplexed passive optical network (TDM-PON) with duplex fiber system against the fiber failure. The new proposed optical line terminal (OLT), optical network unit (ONU), and remote node (RN) can be used to prevent and protect the occurrence of fiber failure in the self-protected tree-type PON. The protection and restoration time of the access network can be archived within 7 ms in this experiment. In addition, the performances of data traffic for the fiber access network are also analyzed and discussed. (C) 2007 Optical Society of America.
Triple-wavelength erbium fiber ring laser based on compound-ring scheme
(2007-12-24)
Yeh, Chien Hung
;
Shih, Fu Yuan
;
Chen, Chang Tai
;
Chi, Sien
;
光電工程學系
A triple-wavelength erbium-doped compound ring fiber laser using the fiber-based triple-ring filter (TRF) is proposed and experimentally investigated. Using the fiber-based TRF laser scheme, the proposed laser can lase three wavelengths simultaneously. The fiber laser retrieve the optical side-mode suppression ratios (SMSRs) of 40.2, 40.4 and 41.6 dB and the output powers of -9, -8.8 and -7.6 dBm at the wavelengths 1555.89, 1556.77 and 1557.66 nm, respectively. The mode spacing of the triple-wavelength fiber laser is nearly 0.9 nm. Moreover, the output power stability of the ring laser has also been measured and analyzed. (c) 2007 Optical Society of America.
Using 10 Gb/s remodulation DPSK signal in self-restored colorless WDM-PON system
(2009-06-01)
Yeh, Chien Hung
;
Chow, Chi Wai
;
Chi, Sien
;
光電工程學系
;
Department of Photonics
In this investigation, we propose and experimentally demonstrate the remodulation technique using DPSK format in both downlink and uplink traffics with high extinction ratio (ER) in colorless WDM-PON; together with a simple self-restored architecture against fiber fault. Error free operation was achieved in a 20-km-reach 10-Gb/s WDM-PON without dispersion compensation. Comparison with other wavelength remodulation schemes for WDM-PONs is also performed, showing the proposed scheme can be a potential candidate for next generation wavelength reuse WDM-PONs. In addition, the performance of self-protection has also been discussed and analyzed. Crown Copyright (C) 2008 Published by Elsevier Inc. All rights reserved.
Utilization of four WDM channels with signal rernodulation of OFDM-QAM for 10 Gb/s uplink passive optical networks
(2009-09-15)
Yeh, Chien Hung
;
Chow, Chi Wai
;
光電工程學系
;
Department of Photonics
In this investigation, we experimentally investigate an extended reach (ER) time-division-multiplexed passive optical network (TDM-PON) using four wavelength-multiplexed channels to achieve 16Gb/s downlink and 10 Gb/s uplink traffic. Each downlink signal uses the highly spectral efficient 4 Gb/s OFDM-QAM, and each uplink signal is generated by signal remodulating the downlink signal via a reflective semiconductor amplifier (RSOA) at 2.5 Gb/s non-return-to-zero (NRZ). In addition, the performance of the proposed ER TDM-PON has also been analyzed and discussed. (c) 2009 Elsevier B.V. All rights reserved.
Utilization of self-injection Fabry-Perot laser diode for long-reach WDM-PON
(2010-01-01)
Shih, Fu Yuan
;
Yeh, Chien Hung
;
Chow, Chi Wai
;
Wang, Chia Hsuan
;
Chi, Sien
In this investigation we propose and demonstrate a wavelength widely tunable laser source employing a self-injected Fabry-Perot laser diode (FP-LD) for long-reach wavelength-division-multiplexed passive optical network (WDM-PON). By using a tunable bandpass filter and an optical circulator inside the gain cavity, a stable and single-longitudinal-mode (SLM) laser output is achieved. Besides, the proposed laser sources are directly modulated at 2.5 Gb/s for both downlink and uplink transmissions of 85 km single mode fiber (SMF) in PON without dispersion compensation. (c) 2009 Elsevier Inc. All rights reserved.