Browsing by Author "Peng, Jin-Long"

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A terahertz plastic wire based evanescent field sensor for high sensitivity liquid detection
(2010)
You, Borwen
;
Lu, Ja-Yu
;
Pan, Ci-Ling
;
Liu, Tze-An
;
Peng, Jin-Long
A highly sensitive detection method based on the evanescent wave of a terahertz subwavelength plastic wire was demonstrated for liquid sensing. A 20ppm melamine alcohol solution is successfully identified with refractive-index sensitivity of 0.01. (C)2010 Optical Society of America
A terahertz plastic wire based evanescent field sensor for high sensitivity liquid detection
(2009-11-09)
You, Borwen
;
Liu, Tze-An
;
Peng, Jin-Long
;
Pan, Ci-Ling
;
Lu, Ja-Yu
A highly sensitive detection method based on the evanescent wave of a terahertz subwavelength plastic wire was demonstrated for liquid sensing. Terahertz power spreading outside the wire core makes the waveguide dispersion sensitive to the cladding index variation, resulting in a considerable deviation of waveguide dispersion. Two liquids with transparent appearances, water and alcohol, are easily distinguished based on the waveguide dispersion, which is consistent with theoretical predictions. A melamine alcohol solution with various concentrations is identified successfully, and the detection limit is up to 20ppm, i.e. equivalent to the index variation on the order of 0.01. (C) 2009 Optical Society of America
Characterization of Subwavelength Plastic Fiber Utilizing Terahertz Time-Domain Spectroscopy
(2009-01-01)
You, Borwen
;
Liu, Tze-An
;
Peng, Jin-Long
;
Pan, Ci-Ling
;
Lu, Ja-Yu
We present the first characterization of a simple subwavelength-diameter plastic wire by using wideband terahertz time-domain spectroscopy. The propagation characteristics including waveguide dispersion, group velocity, and attenuation constant of various plastic wires with different diameters and refractive indices are studied. The experimental results show the subwavelength plastic wire has extremely low waveguide dispersion and low attenuation constant (<0.01cm(-1)) at its THz transmission band due to much reduced fractional power delivered inside the lossy core, which is consistent with the theoretical calculations. With the large evanescent-fields, the subwavelength plastic wire has capability to integrate with micro-fluid channel for sensitive bio-sensing applications.
Compact 84 GHz passive mode-locked fiber laser using dual-fiber coupled fused-quartz microresonator
(2017-10-01)
Liu, Tze-An
;
Hsu, Yung
;
Chow, Chi-Wai
;
Chuang, Yi-Chen
;
Ting, Wei-Jo
We propose and demonstrate a compact and portable-size 84-GHz passive mode-locked fiber laser, in which a dual-fiber coupled fused-quartz microresonator is employed as the intracavity optical comb filter as well as the optical nonlinear material for optical frequency comb generation. About eight coherent optical tones can be generated in the proposed fiber laser. The 20-dB bandwidth is larger than 588 GHz. The full-width halfmaximum pulse-width of the proposed laser is 2.5 ps. We also demonstrate the feasibility of using the proposed passive mode-locked fiber laser to carry a 5-Gbit/s on-off-keying signal and transmit over 20-km standard single mode fiber. A 7% forward error correction requirement can be achieved, showing the proposed fiber laser can be a potential candidate for fiber-wireless applications. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Relative carrier-envelope phase stabilization of hybridly synchronized ultrafast Yb and Er fiber-laser systems with the feed-forward scheme
(2015-03-15)
Fong, Bo-Jyun
;
Lin, Wei-Ting
;
Wu, Shang-Ying
;
Peng, Jin-Long
;
Hsiang, Wei-Wei
Stabilization of the relative carrier-envelope (CE) phase for hybridly synchronized two-color fs Yb and Er fiber-laser systems is demonstrated for the first time by utilizing the feed-forward scheme based on an acousto-optic frequency shifter. The slow drift issues arising from the feed-forward scheme are solved by adding the in-loop relative CE frequency coarse stabilization via modulating the laser pump current. Sub-fs timing locking between the two-color pulses is still maintained due to the fast response and large locking range of hybrid synchronization. The approach provides an alternative way to obtain phase-stable synchronized two-color pulses with higher pulse energies. (C) 2015 Optical Society of America
Simultaneously Transfer Microwave and Optical Frequency Through Fiber Using Mode-Locked Fiber Laser
(2009-01-01)
Kang, Chun-Wei
;
Liu, Tze-An
;
Shu, Ren-Huei
;
Pan, Ci-Ling
;
Peng, Jin-Long
Microwave and optical frequency references are simultaneously transferred through fiber using a frequency-stabilized mode-locked Er-fiber laser comb. The instability for transferred microwave and optical frequencies are 2.0x10(-3) and 7.5x10(-1)5@1 s, respectively, for 3 km transmission. (C) 2009 Optical Society of America
Stabilizing the relative carrier-envelop phase of hybridly synchronized ultrafast Yb and Er fiber laser systems by the feed-forward scheme
(2015)
Hsiang, Wei-Wei
;
Fong, Bo-Jyun
;
Lin, Wei-Ting
;
Wu, Shang-Ying
;
Peng, Jin-Long
Stabilization of the relative carrier-envelope (CE) phase for hybridly synchronized two-color fs Yb and Er fiber laser systems is demonstrated for the first time by utilizing the feed-forward scheme based on an acousto-optic frequency shifter.