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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 30, Iss. 12 — Jun. 15, 2012
  • pp: 1948–1953

A Continuously Tunable Microwave Fractional Hilbert Transformer Based on a Nonuniformly Spaced Photonic Microwave Delay-Line Filter

Ze Li, Yichen Han, Hao Chi, Xianmin Zhang, and Jianping Yao

Journal of Lightwave Technology, Vol. 30, Issue 12, pp. 1948-1953 (2012)


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Abstract

A continuously tunable microwave fractional Hilbert transformer (FHT) implemented based on a nonuniformly spaced photonic microwave delay-line filter is proposed and demonstrated. An FHT has a frequency response with a unity magnitude response and a phase response having a phase shift between 0 and π at the center frequency. A seven-tap photonic microwave delay-line filter with nonuniformly spaced taps is designed to provide such a frequency response. The advantage of using nonuniform spacing is that an equivalent negative coefficient can be achieved by introducing an additional time delay leading to a π phase shift, corresponding to a negative coefficient. An FHT operating at a center frequency around 8.165 GHz with a tunable order between 0.24 and 1 is implemented. A classical HT operating at a center frequency of 7.573 GHz with a bandwidth greater than 4.5 GHz is also implemented. The use of the classical HT to perform temporal Hilbert transform of a Gaussian-like electrical pulse is demonstrated.

© 2012 IEEE

Citation
Ze Li, Yichen Han, Hao Chi, Xianmin Zhang, and Jianping Yao, "A Continuously Tunable Microwave Fractional Hilbert Transformer Based on a Nonuniformly Spaced Photonic Microwave Delay-Line Filter," J. Lightwave Technol. 30, 1948-1953 (2012)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-30-12-1948

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