Browsing by Author "Yeh"

Now showing 1 - 6 of 6

Fast wavelength-tunable laser system using Fabry-Perot laser diode
(2006-04-11)
Chi
;
Sien
;
Lee
;
Chien-Chung
;
Yeh
The invention relates to a laser system using a multi-longitudinal-mode Fabry-Perot laser diode as an inter-injection light source and a gain cavity formed by other laser diodes of such type so as to achieve the function of fast wavelength switching, so that it is possible to achieve repetitively fast switching of wavelength by varying and controlling the bias voltage of maximum optical gain in said inter-injection type multi-longitudinal-mode Fabry-Perot laser diode so as to achieve three different wavelengths with tuning range of 3.5 nm for a side-mode suppression ratio (SMSR) greater than 19 dB and a response time of wavelength switching in the order of nanosecond.
Fiber sensing system with self-detection mechanism
(2011-04-12)
Chow
;
Chi-Wai
;
Chi
;
Sien
;
Wang
The present invention discloses a fiber sensing system with self-detection mechanism which utilizes a central office to control secondary ring architecture formed by fiber sensor, remote node and optical coupler primarily. The secondary ring architecture is connected serially to form a primary ring architecture. The central office has a tunable laser light source that can deliver the light source to the fiber sensor. Since the fiber sensor has reflective ability, all light source signal sent by the tunable laser light source will be detected and measured by the fiber sensor. Thus central office can detect all signals reflected by the fiber sensor and produce a spectrum for analyzing fault point locations. The present invention can greatly enhance survivability and sensing capacity of all fiber sensors, so that when a fault point caused by environmental change within the fiber, it will not effect the overall operation of the sensing mechanism. The application of fiber sensor can also reduce cost and complexity of the overall fiber network topology.
Image processing system for integrating multi-resolution images
(2010-05-18)
Hung
;
Yi-Ping
;
Yeh
;
Wei-Shian
The image processing system for integrating multi-resolution images mainly applies several different multi-resolution image capture devices to extract the images from the observed scene and using the multi-resolution imaging devices to present the scene images relative to the observed scenes, respectively. In order to present a seamless image according to two different-resolution image sources, the coordinate conversions among the image capture devices, and among the imaging devices are mainly applied to extract and present the entire image to be able to resemble having a single image capturing source and a single imaging source.
Method for fabrication of polycrystallin silicon thin film transistors
(2006-09-19)
Yeh
;
Ching-Fa
;
Chen
;
Tien-Fu
;
Lou
A method for fabricating polycrystalline silicon film transistors, which includes a polysilicon spacer capping onto a sidewall of an active layer in the thin film transistors by an isotropic dry etching of the silicon film. This method suppresses the shrinkage of the active layer during recrystallization by the laser. Large grains are formed in the channel after recrystallization utilizing a high-energy continuous wavelength laser or an excimer laser annealing the active layer. This process does not require an additional mask. Uniform arrangement of grain boundaries and large grain sizes promotes uniformity of performance of the device, which is important in the fields of low temperature polycrystalline silicon thin film transistors (LTPS-TFTs).
Method for fabrication of polycrystalline silicon thin film transistors
(2006-10-03)
Yeh
;
Ching-Fa
;
Chen
;
Tien-Fu
;
Lou
The present invention provides a method for fabrication of polycrystalline silicon thin film transistors, which forms a silicon spacer on the sidewall of the active layer of a thin film transistor (TFT) by way of anisotropic plasma etching in a single direction. The silicon spacer provides a mechanism for laser recrystallization on the sidewall to prevent the active layer from shrinkage or shelling-off after the laser recrystallization. According to the present invention, large grains can be formed in the channel without additional mask during production. By doing so, the characteristics of the components are enhanced; the uniformity is improved; and, the production cost is lowered. Therefore, this technique will play an important role in the fields of low temperature polycrystalline silicon thin film transistor (LTPS-TFT).
Optical monitoring apparatus for use in wavelength division multiplexing network
(2006-03-07)
Chi
;
Sien
;
Lee
;
Chien-Chung
;
Yeh
An optical monitoring apparatus based on the scanning of the gain profile of erbium-doped fiber amplifiers (EDFA) and applied in a wavelength division multiplexing network has been proposed and experimentally demonstrated. The EDFA with an injected saturated tone can provide variable gain or loss profile by controlling the pump power. The components used in the present optical monitoring apparatus for use in a wavelength division multiplexing network are easily available and cost-effective, valuable for monitoring frequency and power of a WDM optical communication system, and capable of greatly enhancing resolution of monitoring frequency spectrum for the optical fiber network system.