Browsing by Author "Lu, Hai-Han"

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Coupling-ratio controlled wavelength tunability of a power conversion efficiency improved L-band Erbium-doped fiber laser
(2006-01-01)
Lin, Gong-Ru
;
Chang, Jun-Yuan
;
Liao, Yu-Sheng
;
Lu, Hai-Han
;
光電工程學系
A coupling-ratio controlled wavelength tunable L-band erbium-doped fiber laser with tuning range of 45nm (1567 1612 nm), quantum efficiency of 42%, power conversion efficiency of 37%, tuning resolution of 0.3 mn is reported. The wavelength-tuning is achieved by a tunable band-pass filter (TBPF) or by adjusting the tunable-ratio optical coupler (TROC) without TBPF because of the difference of intracavity loss. The output wavelength can be tunable in the full L-band with TBPF, from 1567 to 1612 nm, and the pulse-width is < 14.2 ps. Specially, during the wavelength-tunable process without TBPF, the modulation frequency of about 1 GHz remains unchanged and near-transform-limited pulses are generated by linear compression with 32.5 in single mode fiber (SMF) under 10% output coupling ratio.
L-band Erbium-doped fiber laser with coupling-ratio controlled wavelength tunability
(2006-10-16)
Lin, Gong-Ru
;
Chang, Jun-Yuan
;
Liao, Yu-Sheng
;
Lu, Hai-Han
;
光電工程學系
By controlling the output coupling ratio, we demonstrate a novel wavelength-tunable L-band Erbium-doped fiber laser (EDFL) with a maximum tuning range up to 58 nm ( from 1567 to 1625 nm) by controlling its output coupling ratio between 1% and 99%. The L-band EDFL is configured by using a bi-directionally dual-wavelength pumped EDFA in close-loop with an output coupler of tunable coupling ratio and an air-gap inserted FC/PC connector pair. Such an EDFL exhibits a quantum efficiency of 42% and an ultra-high power conversion efficiency of 37% under optimized pumping scheme, providing the small-signal gain and output power of similar to 34 dB and 91 mW, respectively. Low variation of < 1.2 dB on channel power, power fluctuation of 0.04% and a narrow linewidth of 0.03 nm are obtained. (c) 2006 Optical Society of America
Underwater 6.4-m Optical Wireless Communication with 8.8-Gbps Encoded 450-nm GaN Laser Diode
(2016)
Chi, Yu-Chieh
;
Wu, Tsai-Chen
;
Lin, Che-Yu
;
Lu, Hai-Han
;
Kuo, Hao-Chung
6.4-m underwater optical wireless communication based on a GaN blue laser diode under direct 8.8-Gbps QAM-OFDM encoding is demonstrated with an average signal-to-noise ratio of 16 dB and a bit error rate of 3.8 x 10(-3).