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Review of photonic Hilbert transformers |
Chaotan SIMA(), James C. GATES, Michalis N. ZERVAS, Peter G. R. SMITH |
Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK |
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Abstract This paper reviews the demonstrations of photonic Hilbert transformers (PHTs), describing their progress and recent developments. The physical operating principles of PHTs including fractional Hilbert transformers are discussed, together with device applications in all-optical signal processing. Versatile approaches to realize PHTs are discussed, e.g., discrete free space optics, fiber-based schemes and integrated planar geometry. The numerical designs and experimental performances of these PHTs are analyzed in terms of spectral quality, operating bandwidth, system integration, and mechanical and thermal stability. Recent developments of the monolithically integrated photonic Hilbert transform (HT) devices include directional couplers and planar Bragg gratings which allow all-optical single-sideband (SSB) suppression and sideband switching.
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Keywords
photonic Hilbert transformer (PHT)
Bragg reflectors
direct UV writing
all-optical signal processing
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Corresponding Author(s):
SIMA Chaotan,Email:Chaotan.Sima@soton.ac.uk
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Issue Date: 05 March 2013
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