Browsing by Author "Lee, SL"

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High-efficiency wide-band SOA-based wavelength converters by using dual-pumped four-wave mixing and an assist beam
(2004-08-01)
Hsu, DZ
;
Lee, SL
;
Gong, PM
;
Lin, YM
;
Lee, SSW
Wavelength conversion with a high efficiency and wide conversion range can easily be realized by applying an assist beam of short wavelength to a dual-pumped semiconductor optical amplifier (SOA). Experimental results reveal that an assist beam can improve the conversion efficiency and signal-to-background ratio by up to 8.5 and 4.1 dB, respectively, when the SOA is biased at the current that makes the SOA transparent to the assist beam. The efficiency can exceed -10 dB over an 80-nm wavelength conversion range using a 23-dB gain SOA. The assist beam increases the system power budget because it simultaneously improves the conversion efficiency and reduces the receiver power penalty. The power penalties for up-converting and down-converting 10-Gb/s signals to 25 nm of wavelength range are less than 0.5 and 2.5 dB, respectively.
Using superimposed ASK label in a 10-GB/s multihop all-optical label swapping system
(2004-02-01)
Lin, YM
;
Yuang, MC
;
Lee, SL
;
Way, WI
;
資訊工程學系
A novel optical-label-swapping technique is proposed, experimentally verified, and theoretically analyzed in this paper. The technique superimposes a low-speed amplitude-shift-keying (ASK) label on top of a high-speed de-balanced-line-coded ASK payload. A multihop long-distance transmission experiment using a recirculating loop has been successfully demonstrated, and an experimental record is set when compared with other optical-label-swapping techniques.