Zobrazeno 1 - 10
of 43
pro vyhledávání: '"Lalitha Ponnampalam"'
Autor:
Ian H. White, Siming Chen, Mingchu Tang, Alwyn J. Seeds, Kenichi Nishi, Mitsuru Sugawara, Shujie Pan, Mu-Chieh Lo, Richard V. Penty, Zhixin Liu, Zichuan Zhou, Huiyun Liu, Jianou Huang, Keizo Takemasa, Lalitha Ponnampalam, Zizheng Cao, Zizhuo Liu
Publikováno v:
Photonics Research, 8(12), 1937-1942. OSA Publishing
Semiconductor mode-locked lasers (MLLs) are promising frequency comb sources for dense wavelength-division-multiplexing (DWDM) data communications. Practical data communication requires a frequency-stable comb source in a temperature-varying environm
Autor:
Lalitha Ponnampalam, Zizhuo Liu, Siming Chen, Zichuan Zhou, Shujie Pan, Jianou Huang, Mingchu Tang, Alwyn J. Seeds, Mu-Chieh Lo, Zhixin Liu, Huiyun Liu, Zizheng Cao
Publikováno v:
Conference on Lasers and Electro-Optics.
We report a frequency comb source based on a quantum dot mode-locked laser that generates a frequency comb with a stable 25.5 GHz mode spacing over an ultra-broad temperature range of 20 °C - 120 °C.
Autor:
Paul Dean, Lianhe Li, Edmund H. Linfield, A. Giles Davies, Reshma A. Mohandas, Lalitha Ponnampalam, Alwyn J. Seeds, Joshua R. Freeman
The accuracy of high-resolution spectroscopy depends critically on the stability, frequency control, and traceability available from laser sources. In this work, we report exact tunable frequency synthesis and phase control of a terahertz laser. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a6135ce4028a2afc675e7366137f03d3
https://eprints.whiterose.ac.uk/163236/8/optica-7-9-1143.pdf
https://eprints.whiterose.ac.uk/163236/8/optica-7-9-1143.pdf
Autor:
Lalitha Ponnampalam, A. Giles Davies, Joshua R. Freeman, Cyril C. Renaud, Reshma A. Mohandas, Martyn J. Fice, Edmund H. Linfield, Alwyn J. Seeds
Publikováno v:
2019 International Topical Meeting on Microwave Photonics (MWP).
We present a highly coherent tunable THz source based on an optical frequency comb generator with frequencies referenced to primary frequency standards. The THz synthesizer is continuously tunable from 122.5 GHz to greater than 2.7 THz, with a spectr
Autor:
Lalitha Ponnampalam, Paul Dean, Joshua R. Freeman, A. Giles Davies, Reshma A. Mohandas, Alwyn J. Seeds, Edmund H. Linfield
Publikováno v:
2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
We report on the high-resolution frequency and phase control of a terahertz (THz) quantum cascade laser (QCL). The 2.0 THz QCL is locked to a stable microwave reference frequency via an all-fibre infrared frequency comb. The frequency of the QCL is c
Autor:
Martyn J. Fice, Haymen Shams, Katarzyna Balakier, Luis Gonzalez-Guerrero, Alwyn J. Seeds, Lalitha Ponnampalam, Cyril C. Renaud, Manoj P. Thakur, Chris Graham
Publikováno v:
Broadband Access Communication Technologies XIII
In this paper we present two different techniques for photonic generation of millimeter and THz waves. Each of them tackles the phase noise problem associated with optical sources in a different way. The first one relays on the heterodyne down-conver
Publikováno v:
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
We present an optical frequency comb generator with a record span of 3.8 THz suitable for high resolution THz spectroscopy, based on a single phase modulator system. The line spacing, exactly referenced to a microwave synthesizer, can be continuously
Autor:
Haymen Shams, Cyril C. Renaud, Alwyn J. Seeds, Chris Graham, Katarzyna Balakier, Martyn J. Fice, Lalitha Ponnampalam
Publikováno v:
2017 International Topical Meeting on Microwave Photonics (MWP).
This paper describes the first optical phase lock loop (OPLL) based on a photonic integrated circuit (PIC) fabricated using a generic foundry process and off-the-shelf electronic components. The PIC contains a DBR laser that is for the first time fre
Autor:
Cyril C. Renaud, Lalitha Ponnampalam, Martyn J. Fice, Frederic van Dijk, Haymen Shams, Chris Graham, Alwyn J. Seeds, Katarzyna Balakier
Publikováno v:
2017 International Topical Meeting on Microwave Photonics (MWP).
We demonstrate experimentally, for the first time, the photonic generation of a continuous tunable THz wireless signal based on using an optical phase lock loop (OPLL) subsystem and optical frequency comb generator (OFCG). The OPLL is employed to sel
Autor:
Katarzyna Balakier, Martyn J. Fice, Cyril C. Renaud, Alwyn J. Seeds, Lalitha Ponnampalam, Haymen Shams, Chris Graham
Publikováno v:
2017 IEEE Photonics Conference (IPC) Part II.
We report the first foundry-fabricated photonic integrated circuit (PIC) optical phase lock loop (OPLL) tuneable active optical filter for optical frequency comb line selection and amplification. The PIC containing DBR lasers and photodiodes is integ