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Optical time-domain differentiation based on intensive differential group delay |
| Li Zheng-Yong(李政勇)†, Yu Xiang-Zhi(余向志), and Wu Chong-Qing(吴重庆) |
| Key Laboratory of Luminescence and Optical Information of the Ministry of Education and Institute of Optical Information, Beijing Jiaotong University, Beijing 100044, China |
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Abstract An optical time-domain differentiation scheme is proposed and demonstrated based on the intensive differential group delay in a high birefringence fibre waveguide. Results show that the differentiation waveforms agree well with the mathematically calculated derivatives. Both error and efficiency will increase when the birefringence fibre becomes longer, and the error rises up more quickly while the efficiency approaches to a maximum of ～0.25. By using a 1-m birefringence fibre a lower error of ～0.26% is obtained with an efficiency of 1% for the first-order differentiation of 10-ps Gaussian optical pulses, and the high-order optical differentiation up to 4th order is achieved with an error less than 3%. Due to its compact structure being easy to integrate and cascade into photonic circuits, our scheme has great potential for ultrafast signal processing.
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Received: 01 April 2011
Revised: 04 May 2011
Accepted manuscript online:
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PACS:
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42.79.Hp
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(Optical processors, correlators, and modulators)
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42.81.Qb
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(Fiber waveguides, couplers, and arrays)
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42.81.Gs
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(Birefringence, polarization)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60907027 and 60877057) and the Specialized Research Fund for the Doctoral Program of Higher Education of Ministry of Education of China (Grant No. 20090009120035). |
Cite this article:
Li Zheng-Yong(李政勇), Yu Xiang-Zhi(余向志), and Wu Chong-Qing(吴重庆) Optical time-domain differentiation based on intensive differential group delay 2011 Chin. Phys. B 20 104208
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