Journal
OPTICS EXPRESS
Volume 26, Issue 16, Pages 20450-20458Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.26.020450
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Funding
- National Natural Science Foundation of China [61404056, 61475050]
- Natural Science Foundation of Hubei Province [2017CFB258]
- Fundamental Research Funds for the Central Universities (HUST) [2017KFXKJC002]
- Engineering and Physical Sciences Research Council (EPSRC)
- UK [EP/K034480/1, 1375564]
- EPSRC [EP/K034480/1] Funding Source: UKRI
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We propose and experimentally demonstrate wideband and continuously tunable fractional-order photonic Hilbert transformers (FrHT). These are realized by a single apodized planar Bragg grating within a high-birefringence planar substrate. The fractional order of the FrHT is continuously tuned and precisely controlled by changing the polarization state of the input light. The experimental characterization demonstrates an operating bandwidth up to 120 GHz with amplitude ripples below 3 dB. The optical phase shift response is directly measured to verify the proposed tuning property, demonstrating transform orders of around 1, 0.7, and 0.5. This approach is simple, stable, and compact compared to other existing methods and has great potential in the fields of ultrafast all-optical signal processing. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
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