• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.16-17
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• 2003

지난 수년간 인터넷 보급에 따른 급격한 통신량 증가에 따른 요구는 차세대 통신 기술인 WDM을 구축하게 되었고 이에 따라 WDM 라우팅 기술과 스위칭 기술이 절실히 필요로 하게 되었다. WDM에 있어서 다른 경로나 목적지로 신호를 보내기 위해서는 신호의 파장이 변환 되어야 하므로 신호의 파장변환은 라우팅에 있어 핵심적인 기술 중 하나로 인식되어지고 있다 현재 사용되어지고 있는 전광 파장 변환기는 주로 SOA (Semiconductor Optical Amplifier)의 비선형 특성인 XGM, XPM, FWM등을 이용한 것으로서 편광 민감성, ASE에 의한 SNR 감소, 신호크기 변형과 높은 가격으로 인해 안정적인 파장변환기로 쓰기에는 다소 무리가 있다. (중략)

• Korean Journal of Optics and Photonics
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• v.14 no.5
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• pp.530-534
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• 2003

A novel all-optical NOR gate is proposed and demonstrated for the first time by use of gain saturation in a semiconductor optical amplifier (SOA). It is operated by the nonlinearity of the SOA gain. Hence, to obtain sufficient gain saturation of the SOA, pump signals are amplified by an Er-doped fiber amplifier at the input of the SOA. The operation characteristics of the all-optical NOR gate are successfully measured at 10 Gbit/s.

• Korean Journal of Optics and Photonics
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• v.23 no.4
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• pp.143-146
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• 2012

All-optical data extraction, one of the key technologies for all-optical computing and optical communication to perform add-drop, packet switching, and data reset, etc., is experimentally demonstrated by using cross-gain modulation (XGM) of semiconductor optical amplifiers (SOAs). Also, all-optical data extraction based on numerical simulation is performed by using the VPI simulation tool. In this paper, the suggested optical system based on SOAs shows the potential for high speed, and highly integrable and low power optical data computing.

• Korean Journal of Optics and Photonics
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• v.19 no.1
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• pp.60-67
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• 2008

An all-optical 4-bit Gray code to binary coded decimal (BCD) converter by means of commercially available numerical analysis tool (VPI) was demonstrated, for the first time to our knowledge. Circuit design approach was modified appropriately in order to fit the electrical method on an all-optical logic circuit based on a cross gain modulation (XGM) process so that signal degradation due to the non-ideal optical logic gates can be minimized. Without regenerations, Q-factor of around 4 was obtained for the most severely degraded output bit (least significant bit-LSB) with 2.5 Gbps clean input signals having 20 dB extinction ratio. While modifying the two-level simplification method and Karnaugh map method to design a Gray code to BCD converter, a general design concept was also founded (one-level simplification) in this research, not only for the Gray code to BCD converter but also for any general applications.

• Korean Journal of Optics and Photonics
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• v.17 no.6
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• pp.564-568
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• 2006

Using the cross-gain modulation (XGM) characteristics of semiconductor optical amplifiers (SOAs), multi-functional all-optical logic gates, including XOR, AND, and OR gates are successfully simulated and demonstrated at 10Gbit/s. A VPI component maker^TM simulation tool is used for the simulation of multi-functional all-optical logic gates and the10 Cbit/s input signal is made by a mode-locked fiber ring laser. A multi-quantum well (MQW) SOA is used for the simulation and demonstration of the all-optical logic system. Our suggested system is composed of three MQW SOAs, SOA-1 and SOA-2 for XOR logic operation and SOA-2 and SOA-3 for AND logic operation. By the addition of two output signals XOR and AND, all-optical OR logic can be obtained.

• Korean Journal of Optics and Photonics
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• v.16 no.4
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• pp.392-396
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• 2005

A new structure of tunable wavelength converter based on XCM in SOA was tried and analyzed. This converter used single SOA and had very simple structure. In this paper, results were experimentally obtained and demonstrated. Pump signal was generated with NRZ $(PRBS\;2^{31}-1)$ and data rate 2.5 Gbps. WDM multi conveted signals showed more than 8.3 dB extinction ratio. For BER performance, all these converted signals had within 5.0 dB power penalty compared with the pump signal. With these results, we showed that this converter was suitable for 2.5 Gbps WDM multi-channel wavelength converting.