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Experimental investigation of large time-bandwidth product photonic Hilbert transformer based on compact Bragg grating

Experimental investigation of large time-bandwidth product photonic Hilbert transformer based on compact Bragg grating
Experimental investigation of large time-bandwidth product photonic Hilbert transformer based on compact Bragg grating
We propose and experimentally demonstrate an integrated photonic Hilbert transformer (PHT) with substantial time bandwidth product (TBP). Due to the current substrate material and fabrication technique, PHT devices find it challenging to achieve ultrawide operative bandwidth while maintaining the minimum bandwidth level presented as the narrow central notch in frequency response. This implies that the TBP value is restricted. Here, we investigate the synthesized refractive index profile in compact Bragg grating design for theoretical simulation and the linearity-enhanced direct UV grating writing fabrication for experimental implementation. The fabricated device could process microwave photonic signals as Hilbert transformation between 50 GHz and 3 THz, with the TBP above 60, which is the largest experimental data to the best of our knowledge. This technique allows the PHT with improved spectral performance to be suitable for analog all-optical signal processing.
1943-0655
1-8
Liu, B.
75418c0a-f2b1-49fd-bf77-86227be5cca6
Sima, C.
5d4e6b29-c400-4881-952e-63d0768aee6f
Yang, W.
1cf3160d-b41e-4228-8909-c1580b31462d
Cai, B.
2fda4c47-626f-4a72-bea7-bf0b59bdd934
Liu, D.
fa317aa7-0f6d-4d60-9329-4b476debd724
Yu, Y.
dd85cd77-4fc3-4972-b9b8-cc785af3be64
Gates, J.C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Liu, B.
75418c0a-f2b1-49fd-bf77-86227be5cca6
Sima, C.
5d4e6b29-c400-4881-952e-63d0768aee6f
Yang, W.
1cf3160d-b41e-4228-8909-c1580b31462d
Cai, B.
2fda4c47-626f-4a72-bea7-bf0b59bdd934
Liu, D.
fa317aa7-0f6d-4d60-9329-4b476debd724
Yu, Y.
dd85cd77-4fc3-4972-b9b8-cc785af3be64
Gates, J.C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Zervas, M.N.
1840a474-dd50-4a55-ab74-6f086aa3f701
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6

Liu, B., Sima, C., Yang, W., Cai, B., Liu, D., Yu, Y., Gates, J.C., Zervas, M.N. and Smith, P.G.R. (2016) Experimental investigation of large time-bandwidth product photonic Hilbert transformer based on compact Bragg grating. IEEE Photonics Journal, 8 (4), 1-8, [7803907]. (doi:10.1109/JPHOT.2016.2590941).

Record type: Article

Abstract

We propose and experimentally demonstrate an integrated photonic Hilbert transformer (PHT) with substantial time bandwidth product (TBP). Due to the current substrate material and fabrication technique, PHT devices find it challenging to achieve ultrawide operative bandwidth while maintaining the minimum bandwidth level presented as the narrow central notch in frequency response. This implies that the TBP value is restricted. Here, we investigate the synthesized refractive index profile in compact Bragg grating design for theoretical simulation and the linearity-enhanced direct UV grating writing fabrication for experimental implementation. The fabricated device could process microwave photonic signals as Hilbert transformation between 50 GHz and 3 THz, with the TBP above 60, which is the largest experimental data to the best of our knowledge. This technique allows the PHT with improved spectral performance to be suitable for analog all-optical signal processing.

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Accepted/In Press date: 9 July 2016
e-pub ahead of print date: 13 July 2016
Published date: August 2016

Identifiers

Local EPrints ID: 441672
URI: http://eprints.soton.ac.uk/id/eprint/441672
ISSN: 1943-0655
PURE UUID: 86c3fd69-3442-4b45-b138-e0905b2e9da2
ORCID for J.C. Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for M.N. Zervas: ORCID iD orcid.org/0000-0002-0651-4059
ORCID for P.G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X

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Date deposited: 23 Jun 2020 16:56
Last modified: 17 Mar 2024 02:52

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Contributors

Author: B. Liu
Author: C. Sima
Author: W. Yang
Author: B. Cai
Author: D. Liu
Author: Y. Yu
Author: J.C. Gates ORCID iD
Author: M.N. Zervas ORCID iD
Author: P.G.R. Smith ORCID iD

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