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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 9 — May. 1, 2014
  • pp: 2778–2781

Continuously tunable photonic fractional Hilbert transformer using a high-contrast germanium-doped silica-on-silicon microring resonator

Hiva Shahoei, Patrick Dumais, and Jianping Yao  »View Author Affiliations


Optics Letters, Vol. 39, Issue 9, pp. 2778-2781 (2014)
http://dx.doi.org/10.1364/OL.39.002778


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Abstract

We propose and experimentally demonstrate a continuously tunable fractional Hilbert transformer (FHT) based on a high-contrast germanium-doped silica-on-silicon (SOS) microring resonator (MRR). The propagation loss of a high-contrast germanium-doped SOS waveguide can be very small (0.02dB/cm) while the lossless bend radius can be less than 1 mm. These characteristics lead to the fabrication of an MRR with a high Q-factor and a large free-spectral range (FSR), which is needed to implement a Hilbert transformer (HT). The SOS MRR is strongly polarization dependent. By changing the polarization direction of the input signal, the phase shift introduced at the center of the resonance spectrum is changed. The tunable phase shift at the resonance wavelength can be used to implement a tunable FHT. A germanium-doped SOS MRR with a high-index contrast of 3.8% is fabricated. The use of the fabricated MRR for the implementation of a tunable FHT with tunable orders at 1, 0.85, 0.95, 1.05, and 1.13 for a Gaussian pulse with the temporal full width at half-maximum of 80 ps is experimentally demonstrated.

© 2014 Optical Society of America

OCIS Codes
(070.0070) Fourier optics and signal processing : Fourier optics and signal processing
(130.3120) Integrated optics : Integrated optics devices
(350.4010) Other areas of optics : Microwaves
(310.5448) Thin films : Polarization, other optical properties
(060.5625) Fiber optics and optical communications : Radio frequency photonics

ToC Category:
Thin Films

History
Original Manuscript: January 28, 2014
Revised Manuscript: March 25, 2014
Manuscript Accepted: March 27, 2014
Published: April 30, 2014

Citation
Hiva Shahoei, Patrick Dumais, and Jianping Yao, "Continuously tunable photonic fractional Hilbert transformer using a high-contrast germanium-doped silica-on-silicon microring resonator," Opt. Lett. 39, 2778-2781 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-9-2778

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