Browsing by Author "Wen, SF"

Now showing 1 - 6 of 6

Adjusting the detection window to improve the soliton communication system
(2000-12-01)
Chi, S
;
Kao, CY
;
Dung, JC
;
Wen, SF
;
光電工程學系
The improvements of the Q factors of 10-Gb/s soliton systems detected by adjusting detection window are studied. We have found that the optimal width of the detection window depends on the noise-induced timing jitter, noise-induced soliton energy fluctuation, amplifier noise, dispersive wave, and soliton pulse width. (C) 2000 Elsevier Science B.V. All rights reserved.
Derivation of a wave equation for pulse propagation beyond a slowly varying envelope approximation
(1996-10-01)
Chi, S
;
Wen, SF
;
光電工程學系
;
Department of Photonics
An iterative method is used to derive an accurate wave equation that governs ultrashort pulse propagation in a single mode fibre. In the derivation, the slowly varying envelope approximation (SVEA) is not required. Therefore, the wave equation can be used to describe the propagation of an ultrashort pulse of a few optical cycles. It is found that, compared with the wave equation obtained by making an SVEA, an accurate wave equation has the same coefficients of the linear dispersion terms and different coefficients of the high-order time derivatives of the non-linear terms.
Gain flattening of erbium-doped fibre amplifier using fibre Bragg gratings
(1998-03-19)
Dung, JC
;
Chi, S
;
Wen, SF
;
光電工程學系
;
Department of Photonics
A new technique, using fibre-Bragg gratings with different centre frequencies to reflect the different channel signals at different positions, is proposed for flattening the gain spectrum of an erbium-doped fibre amplifier. A designed gain excursion of <0.1dB can be achieved for 16 channel multiplexed signals with 0.1mW input power in the 1532-1562nm wavelength region.
Improving soliton transmission by filters and optical phase conjugation
(1996)
Chi, S
;
Dung, JC
;
Wen, SF
;
光電工程學系
;
Department of Photonics
Reduction of soliton interactions by sliding-frequency second-order Butterworth filters
(1996-03-01)
Dung, JC
;
Chi, S
;
Wen, SF
;
光電工程學系
;
Department of Photonics
The reduction of the soliton interaction by use of optical sliding-frequency second-order Butterworth filters is studied numerically. It is found that the second-order Butterworth filters can reduce the soliton interaction more effectively than Fabry-Perot filters or third-order Butterworth filters because the second-order Butterworth filter induces larger frequency chirping on the soliton, compressing it as it propagates in the fiber after the filter. (C) 1996 Optical Society of America
The application of optical phase conjugation in soliton communications
(1996)
Chi, SE
;
Wen, SF
;
Dung, JC
;
交大名義發表
;
光電工程學系
Recent theoretical works on the application of optical phase conjugation in the soliton communications are reviewed and the effect of the in-line filter on the optical phase conjugation is numerically studied. It is shown that, by properly applying the conjugators and choosing the filter bandwidth, the soliton transmission can be significantly improved and its performance is better than applying the sliding-frequency filter for the considered system of 14.3 Gbits/s bit rate.