Browsing by Author "Xie, Yue-Ru"

Now showing 1 - 9 of 9

1.7 to 2.3 Gbps OOK LED VLC Transmission Based on 4 x 4 Color-Polarization-Multiplexing at Extremely Low Illumination
(2019-08-01)
Yeh, Chien-Hung
;
Weng, Jui-Hung
;
Chow, Chi-Wai
;
Luo, Chien-Ming
;
Xie, Yue-Ru
To achieve the high traffic rate of a GaN LED-based visible light communication (VLC), a 4 x 4 color-polarization-multiplexing system is demonstrated by using two blue and two green LEDs. In the measurement, an available bandwidth of blue and green LEDs can be greater than 465 MHz for VLC modulation traffic by using the suitable analogy front end circuit. Hence, the proposed VLC system can deliver 1.7 to 2.3 Gbit/s ON-OFF keying traffic rates in the free space transmission length of 1-4 m under the extremely low illumination of 6.9-136.1 lux for the indoor application. Moreover, the measured BER of each LED is less than the forward error correction target of 3.8 x 10(-3) to maintain the better signal performance.
62nm CW wavelength-selectable erbium-doped fiber compound-ring laser with stable single-mode output
(2019-12-01)
Yeh, Chien-Hung
;
Chang, Yao-Jen
;
Lin, Wen-Piao
;
Xie, Yue-Ru
;
Luo, Chien-Ming
In this demonstration, an erbium-doped fiber (EDF) based laser with stable, wide and wavelength-selectable single-longitudinal-mode (SLM) performances is designed and demonstrated. Here, to achieve SLM oscillation, a compound-ring scheme is constructed in the EDF laser cavity serving as a mode-restriction-filter for densely side-mode suppression. Moreover, the continuous-wave tunability can be scaled from 1520.0 to 1582.0 nm by using the proposed compound-ring scheme and commercial C-band EDF amplifier. In the measurement, the output stability and 3 dB Lorentzian linewidth of each lasing wavelength in the proposed EDF compound-ring laser have also been discussed.
A Selectable Single-Mode Erbium Laser With Power-Flattened Output Employing Dual-Sagnac-Ring
(2019-01-01)
Yeh, Chien-Hung
;
Lin, Wen-Piao
;
Chang, Yao-Jen
;
Xie, Yue-Ru
;
Luo, Chien-Ming
To achieve wavelength-selectable and stable erbium-doped fiber (EDF) laser, a dual-Sagnac-ring configuration is designed to reach single-longitudinal-mode (SLM) oscillation and power-flattened output simultaneously. The presented and experimentally demonstrated EDF laser can also obtain the output power of 7.5 to 11.8 dBm in the continuous-wave (CW) tunability of 1523.0 to 1571.0 nm. Here, the power variation of lasing wavelength can be below than 1.0 dB over a wide working range of 1525.0-1565.0 nm for power-flattened output. Moreover, the 3-dB spectrum linewidth of presented EDF-based laser is measured in the range of 16.4-22.2 kHz via the Lorentzian fitting.
Demonstration of 1-Gbps real-time optical wireless communication by simple transmission scheme
(2020-06-02)
Yeh, Chien-Hung
;
Luo, Chien-Ming
;
Xie, Yue-Ru
;
Chow, Chi-Wai
;
Chen, Ruei-Bin
In the work, we propose and investigate a real-time optical wireless communication (OWC) system with 1 Gbps on-off keying (OOK) traffic rate for indoor and outdoor transmissions. Here, 1 Gbps OWC traffic with error-free operation can be achieved indoors under the free space transmission length of 500 m based on the simulation and experimental results. In addition, 952, 904, 476 Mbps throughput rates of proposed real-time OWC system are measured outdoors after passing through the wireless transmission lengths of 120, 300 and 500 m, respectively.
Integration of FSO Traffic in Ring-Topology Bidirectional Fiber Access Network With Fault Protection
(2020-03-01)
Yeh, Chien-Hung
;
Xie, Yue-Ru
;
Luo, Chien-Ming
;
Chow, Chi-Wai
;
光電工程學系
In this work, we first propose and demonstrate a bidirectional time-division-multiplexing (TDM) free space optical communication (FSO) traffic integrated in ring-based fiber access network together with fiber fault protection. Here, while we add the new designed optical devices in the central office (CO) and each optical wireless unit (OWU) respectively, the TDM-FSO fiber system can achieve the self-protected operation against fault. In addition, according to the proposed ring-based fiber network, the maximum numbers of eight OWUs can be provided for the symmetric 10 Gbps on-off keying (OOK) FSO downstream and upstream connections. As a result, the proposed FSO access network can allow 25 km fiber transmission and proper FSO transmission length depending on the atmospheric attenuation of different weather condition.
Single-mode erbium laser with CW tunability by exploiting saturable absorber and self-injected loop
(2020-03-15)
Yeh, Chien-Hung
;
Luo, Chien-Ming
;
Xie, Yue-Ru
;
Chow, Chi-Wai
;
光電工程學系
We present and demonstrate a stabilized and selectable erbium-doped fiber (EDF) ring laser according to the proposed EDF saturable absorber (SA) and self-injected method to achieve single-longitudinal-mode (SLM) output and narrow the laser linewidth simultaneously. The 60-nm continuous wave (CW) tunability range from 1525.0 to 1585.0 nm is also accomplished here. Moreover, the output performance of wavelength stability and laser linewidth are also performed experimentally.
Survivable and Reliable WDM-PON System With Self-Protected Mechanism Against Fiber Fault
(2019-01-01)
Yeh, Chien-Hung
;
Luo, Chien-Ming
;
Xie, Yue-Ru
;
Chow, Chi-Wai
;
Chen, Yu-Wen
In the paper, we present and design a self-restored wavelength multiplexing division passive optical network (WDM-PON) configuration to prevent the fiber failure and data disconnection. Here, the new remote node (RN) and optical network unit (ONU) are proposed in the fiber network to provide the protection behavior to increase the network reliability and flexibility. Moreover, the network performances of WDM signals are also analyzed and discussed.
Utilizing C-band erbium fiber and saturable absorber for broadband and continuous wavelength tunability laser with single-mode oscillation
(2020-03-01)
Xie, Yue-Ru
;
Luo, Chien-Ming
;
Yeh, Chien-Hung
;
Chow, Chi-Wai
;
光電工程學系
In the paper, we report and exhibit a C-band erbium-doped fiber (EDF) based gain medium laser together with a 5 m unpumped EDF saturable absorber (SA) to attain broadly wavelength-selectable range and single-longitudinal-mode operation. Here, the whole tunability range of 1521.0 to 1601.0 nm (C plus L bands) can be accomplished by the designed EDF laser scheme. The output power and optical signal-to-noise ratio of the EDF laser are detected between -10.9 and 2.3 dBm and 33.1 and 45.1 dB/0.06 nm, respectively. In addition, the achievable SLM operation range runs from 1521.0 to 1581.0 nm due to the absorption limit of the EDF SA. The detected output stability and Lorentzian linewidth are also experimentally considered and significantly discussed.
Utilizing Single Lightwave for Delivering Baseband/FSO/MMW Traffics Simultaneously in PON Architecture
(2019-01-01)
Yeh, Chien-Hung
;
Lin, Wen-Piao
;
Luo, Chien-Ming
;
Xie, Yue-Ru
;
Chang, Yao-Jen
In this work, we demonstrate an integrated optical baseband, free space optical (FSO) communication and millimeter-wave (MMW) traffics through the present passive optical network (PON) architecture by utilizing single wavelength for broadcasting triple-play services. In the execution, we exploit 10 Gbit/s on-off keying (OOK) modulation on 10 GHz Mach-Zehnder modulator (MZM) to produce the downstream baseband signal. And the 10 Gbit/s baseband signal also can cause FSO traffic within the forward error correction (FEC) target after 25 km fiber and 160 m free space transmissions. Moreover, we can utilize the fiber to the extension (FTTE) scheme to provide the 36.42 GHz MMW with 10 Gbit/s OOK data after 25 km fiber link and 8 km extended fiber transmission.