Abstract

Terahertz bandwidth photonic Hilbert transformers are proposed and experimentally demonstrated. The integrated device is fabricated via a direct UV grating writing technique in a silica-on-silicon platform. The photonic Hilbert transformer operates at bandwidths of up to 2 THz (∼16  nm) in the telecom band, a 10-fold greater bandwidth than any previously reported experimental approaches. Achieving this performance requires detailed knowledge of the system transfer function of the direct UV grating writing technique; this allows improved linearity and yields terahertz bandwidth Bragg gratings with improved spectral quality. By incorporating a flat-top reflector and Hilbert grating with a waveguide coupler, an ultrawideband all-optical single-sideband filter is demonstrated.

© 2013 Optical Society of America

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Electron. Lett. (1)

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[CrossRef]

Front. Optoelectron. (1)

C. Sima, J. C. Gates, M. N. Zervas, and P. G. R. Smith, Front. Optoelectron. 6, 78 (2013).
[CrossRef]

IEEE Photon. Technol. Lett. (2)

Z. Li, W. Li, H. Chi, X. Zhang, and J. P. Yao, IEEE Photon. Technol. Lett. 23, 558 (2011).
[CrossRef]

M. Li and J. Yao, IEEE Photon. Technol. Lett. 22, 1559 (2010).
[CrossRef]

J. Quantum Electron. (1)

R. Feced, M. N. Zervas, and M. A. Muriel, J. Quantum Electron. 35, 1105 (1999).
[CrossRef]

Opt. Express (5)

Opt. Lett. (4)

Other (2)

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X. Wang, M. Hanawa, K. Nakamura, and K. Nakagawa, in Proceedings of the 15th Asia-Pacific Conference on Communications (2009), p. 622.

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