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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 28,
  • Issue 11,
  • pp. 1646-1651
  • (2010)

Coherence-Free High-Resolution RF/Microwave Photonic Bandpass Filter With High Skirt Selectivity and High Stopband Attenuation

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Abstract

A new coherence-free high-resolution RF/microwave photonic bandpass filter with high skirt selectivity and high stopband attenuation is presented. It is based on a frequency shifting amplified recirculating delay line loop with a wavelength dependent element at the output. The amplitudes of the delayed optical signals at the output of the frequency shifting loop are windowed by a wavelength dependent element to improve the signal processor frequency response performance. The frequency shifting amplified recirculating delay line enables a large number of taps to be generated using a simple structure for high-resolution signal processing. It has no coherent interference and phase-induced intensity noise limitations, and can be inserted into conventional fibre optic links. Experimental results demonstrate a high-resolution bandpass filter having a high performance with a shape factor of only 3.1 and an extremely high stopband attenuation of over 70 dB.

© 2010 IEEE

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