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Ultra-Narrow Dual-Channel Filter Based on Symmetrical Sampled Fibre Bragg Grating |
| LIU Xue-Ming;WANG Lei-Ran;GONG Yong-Kang;WANG Tao;LU Ke-Qing;ZHANG Tong-Yi;ZHAO Wei |
| State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710068 |
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| Cite this article: |
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LIU Xue-Ming, WANG Lei-Ran, GONG Yong-Kang et al 2007 Chin. Phys. Lett. 24 1302-1204 |
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Abstract A kind of ultra-narrow dual-channel filter is proposed in principle and demonstrated experimentally. This filter is designed by means of two sampled fibre Bragg gratings (SFBGs), where one is periodic 0--π sampling and the other is symmetrical spatial sampling. The former can create two stopbands in the transmission spectra and the latter can produce two ultra-narrow passbands. Our filter has the 3-dB bandwidth of about 1pm, whose value is two orders of magnitude less than the bandwidth of the traditional SFBG filters. The proposed filter has a merit that the channel spacing remains unchanged when tuning the filter.
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| Keywords:
42.81.Qb
42.79.Ci
42.79.-e
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Received: 28 February 2007
Published: 23 April 2007
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| PACS: |
42.81.Qb
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(Fiber waveguides, couplers, and arrays)
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42.79.Ci
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(Filters, zone plates, and polarizers)
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42.79.-e
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(Optical elements, devices, and systems)
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[7] Blais S R et al 2006 IEEE Photon. Technol. Lett. 18 2230
[8] Minasian R A 2006 IEEE Trans. Microwave Theory Tech. 54832 |
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