eprintid: 10051627 rev_number: 32 eprint_status: archive userid: 608 dir: disk0/10/05/16/27 datestamp: 2018-07-05 11:55:24 lastmod: 2021-10-15 22:35:25 status_changed: 2018-10-08 12:15:43 type: article metadata_visibility: show creators_name: Shams, H creators_name: Balakier, K creators_name: Gonzalez-Guerrero, L creators_name: Fice, MJ creators_name: Ponnampalam, L creators_name: Graham, C creators_name: Renaud, CC creators_name: Seeds, AJ title: Optical Frequency Tuning for Coherent THz Wireless Signals ispublished: pub divisions: UCL divisions: B04 divisions: C05 divisions: F46 keywords: Photonic THz generation, optical heterodyning, microwave photonics, high-speed wireless, fiber wireless, radioover-fiber, optical frequency comb note: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons.org/licenses/by/3.0/ abstract: OAPACRWN THz wireless signals have become of interest for future broadband wireless communication. In a scenario where the wireless signals are distributed to many small remote antenna units (RAUs), this will require systems which allow flexible frequency tuning of the generated THz carrier. In this paper, we demonstrate experimentally the implementation of two tuning methods using an optical frequency comb generator (OFCG) for coherent optical frequency tuning in THz wireless-over-fiber systems. The first method is based on using a photonic integrated circuit optical phase lock loop (OPLL) sub-system implemented as a high quality optical filter for single comb line selection and optical amplification. The OPLL generates an optical carrier which is frequency and phase stabilized in reference to one of the optical comb lines with a frequency offset precisely selectable between 4 GHz and 12 GHz. The second method is based on optical single sideband suppressed carrier (SSB-SC) modulation from the filtered comb line using an optical IQ modulator. With this technique, it is possible to suppress the other unwanted optical tones by more than 40 dB. This generated optical carrier is then heterodyned with another filtered optical comb line to generate a tuneable and stable THz carrier. The full system implementations for both methods are demonstrated by transmitting THz wireless signal over fiber with 20 Gbps data in QPSK modulation. The system performance and the quality of the generated THz carrier are evaluated for both methods at different tuned THz carrier frequencies. The methods demonstrated confirm that a high quality tuneable THz carrier can easily be implemented in systems where dynamic frequency allocation is required. date: 2018-10-01 date_type: published official_url: http://doi.org/10.1109/JLT.2018.2846031 oa_status: green full_text_type: pub language: eng primo: open primo_central: open_green verified: verified_manual elements_id: 1565598 doi: 10.1109/JLT.2018.2846031 lyricists_name: Balakier, Katarzyna lyricists_name: Fice, Martyn lyricists_name: Gonzalez Guerrero, Luis lyricists_name: Graham, Christopher lyricists_name: Ponnampalam, Lalitha lyricists_name: Renaud, Cyril lyricists_name: Seeds, Alwyn lyricists_name: Shams, Haymen Ahmed Abdelghaffar lyricists_id: KBALA48 lyricists_id: MFICE70 lyricists_id: LGONZ72 lyricists_id: CGRAH68 lyricists_id: LPONN12 lyricists_id: CRENA49 lyricists_id: AJSEE43 lyricists_id: HELGH05 actors_name: Shams, Haymen Ahmed Abdelghaffar actors_id: HELGH05 actors_role: owner full_text_status: public publication: Journal of Lightwave Technology volume: 36 number: 19 issn: 0733-8724 citation: Shams, H; Balakier, K; Gonzalez-Guerrero, L; Fice, MJ; Ponnampalam, L; Graham, C; Renaud, CC; Shams, H; Balakier, K; Gonzalez-Guerrero, L; Fice, MJ; Ponnampalam, L; Graham, C; Renaud, CC; Seeds, AJ; - view fewer <#> (2018) Optical Frequency Tuning for Coherent THz Wireless Signals. Journal of Lightwave Technology , 36 (19) 10.1109/JLT.2018.2846031 <https://doi.org/10.1109/JLT.2018.2846031>. Green open access document_url: https://discovery.ucl.ac.uk/id/eprint/10051627/8/Renaud_08377986.pdf