Browsing by Author "Lu, H. H."

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Tunable erbium-doped fiber ring laser with signal-averaging function for fiber-optic sensing applications
(2011-01-01)
Kuo, S. T.
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Peng, P. C.
;
Kao, M. S.
;
Lu, H. H.
;
Chen, J. F.
This work proposes a novel erbium-doped fiber ring laser as a sensing control center (CC) for long-haul fiber Bragg grating (FBG) sensor systems. The tunable erbium-doped fiber laser with signal averaging functionality not only provides intense and stable laser light, but also suppresses the effect of noise on the system performance. A sample 30/60 km FBG sensor array is connected to the fiber ring laser to demonstrate experimentally the feasibility and effectiveness of the laser as a CC. The experimental results indicate that the signal averaging operation inside the proposed setup increases the system signal-to-noise ratio (SNR).
Wavelength switching based on quantum-dot vertical-cavity surface-emitting laser
(2012-09-01)
Peng, P. C.
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Wang, H. Y.
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Lan, R. L.
;
Lu, H. H.
;
Lin, G. R.
This study investigates, for the first time, static and dynamic wavelength switching characteristics of the 1.3 mu m quantum-dot vertical-cavity surface-emitting laser (QD VCSEL). The free-running QD VCSEL with lambda 1 and lambda 2 state innately is injected by a laser source with lambda 1 state. When the injection power exceeds the threshold power, the dominant state of the QD VCSEL changes from lambda 2 to lambda 1 state. Results of this study demonstrate that the wavelength switching based on a 1.3 mu m QD VCSEL has a simpler and more cost-effective configuration than those of previous systems.