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Single-SOA-Based Ultrahigh-Speed All-Optical Half Subtracter with PolSK Modulated Signals |
| LI Pei-Li1;HUANG De-Xiu2;ZHANG Xin-Liang2;WANG Yang2 |
| 1College of Optoelectronic Engineering, Nanjing University of Posts and Telecommunications, Nanjing 2100462Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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LI Pei-Li, HUANG De-Xiu, ZHANG Xin-Liang et al 2008 Chin. Phys. Lett. 25 1705-1708 |
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Abstract A novel ultrahigh-speed all-optical half subtracter based on four-wave mixing (FWM) in a single semiconductor optical amplifier (SOA) is proposed. This scheme only requires a single SOA and two input signals without additional light source, so it is quite simple and compact. Due to the polarization-shift-keying (PolSK) modulated signals being used in this scheme, pattern-dependent degradation can be avoided. By numerical simulation, dependence of the critical factors of the logic gate performance, e.g., the output power of logic 1 and extinction ratio (ER), on two input signals power is investigated. In addition, the effect of the gain polarization dependence of SOA is analysed.
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| Keywords:
42.79.Ta
85.60.-q
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Received: 03 January 2008
Published: 29 April 2008
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| PACS: |
42.79.Ta
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(Optical computers, logic elements, interconnects, switches; neural networks)
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85.60.-q
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(Optoelectronic devices)
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