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Investigation of fibre optical parametric amplifiers in telecommunications. / Mehdi Jamshidi Far

Swansea University Author: Mehdi Jamshidi Far

Abstract

Fibre optical parametric amplifiers have been attracting much attention since their first demonstrations. They are capable of providing a high amount of gain over large bandwidth ranges. Since what we call a fibre optical parametric amplifier is technically a combination of one or two pumps and a su...

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Published: 2010
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42681
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last_indexed 2018-08-03T10:10:49Z
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spelling 2018-08-02T16:24:30.1021998 v2 42681 2018-08-02 Investigation of fibre optical parametric amplifiers in telecommunications. dccbfc41e7de673b136bb07e2c78f767 NULL Mehdi Jamshidi Far Mehdi Jamshidi Far true true 2018-08-02 Fibre optical parametric amplifiers have been attracting much attention since their first demonstrations. They are capable of providing a high amount of gain over large bandwidth ranges. Since what we call a fibre optical parametric amplifier is technically a combination of one or two pumps and a suitable highly-nonlinear fibre, their evolution is closely dependent on the improvements in the highly-nonlinear fibre technology and on that of the pumps. Recently, the advent of silica-based highly-nonlinear fibres with proper dispersion characteristics and the availability of high-power erbium-doped fibre amplifiers capable of delivering several Watts of continuous-wave power have led to great improvements in achieving better performances with fibre optical parametric amplifiers. The fibre length required is reduced and fibre optical parametric amplifiers can be operated in the continuous-wave regime, which is necessary for being useful in telecommunications. This work is a report of an investigation of different aspects of fibre optical parametric amplifiers. After reviewing the fundamentals of the operation of this kind of amplifiers, the difficulties facing them are discussed. Among these issues, the problem of nonlinear cross-talk is investigated in more details. 1 experimentally proved that by reducing fibre length, it is possible to keep the crosstalk in a tolerable range. The amplification of 26 communication channels modulated at about 40 Gb/s aggregating to the total capacity of more than 1 Tb/s, while obtaining performance results comparable to those of erbium-doped fibre amplifiers may tone down the chief criticism on the parametric amplifiers. Two amplifiers with a record gain (60 dB for a two-pump amplifier) and a record bandwidth (270 nm in a one-pump amplifier) were demonstrated and it has been shown that there might be possibilities for improving the adverse effect of the Raman gain on the flatness of the gain spectra of the parametric amplifiers at the expense of losing some gain. A sample of a newly-developed bismuth-oxide highly-nonlinear fibre is used to construct a novel scheme for wavelength demultiplexing, and the possibility of simultaneous time- and wavelength demultiplexing is discussed. E-Thesis Electrical engineering. 31 12 2010 2010-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:30.1021998 2018-08-02T16:24:30.1021998 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Mehdi Jamshidi Far NULL 1 0042681-02082018162513.pdf 10807450.pdf 2018-08-02T16:25:13.6270000 Output 11965468 application/pdf E-Thesis true 2018-08-02T16:25:13.6270000 false
title Investigation of fibre optical parametric amplifiers in telecommunications.
spellingShingle Investigation of fibre optical parametric amplifiers in telecommunications.
Mehdi Jamshidi Far
title_short Investigation of fibre optical parametric amplifiers in telecommunications.
title_full Investigation of fibre optical parametric amplifiers in telecommunications.
title_fullStr Investigation of fibre optical parametric amplifiers in telecommunications.
title_full_unstemmed Investigation of fibre optical parametric amplifiers in telecommunications.
title_sort Investigation of fibre optical parametric amplifiers in telecommunications.
author_id_str_mv dccbfc41e7de673b136bb07e2c78f767
author_id_fullname_str_mv dccbfc41e7de673b136bb07e2c78f767_***_Mehdi Jamshidi Far
author Mehdi Jamshidi Far
author2 Mehdi Jamshidi Far
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publishDate 2010
institution Swansea University
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
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description Fibre optical parametric amplifiers have been attracting much attention since their first demonstrations. They are capable of providing a high amount of gain over large bandwidth ranges. Since what we call a fibre optical parametric amplifier is technically a combination of one or two pumps and a suitable highly-nonlinear fibre, their evolution is closely dependent on the improvements in the highly-nonlinear fibre technology and on that of the pumps. Recently, the advent of silica-based highly-nonlinear fibres with proper dispersion characteristics and the availability of high-power erbium-doped fibre amplifiers capable of delivering several Watts of continuous-wave power have led to great improvements in achieving better performances with fibre optical parametric amplifiers. The fibre length required is reduced and fibre optical parametric amplifiers can be operated in the continuous-wave regime, which is necessary for being useful in telecommunications. This work is a report of an investigation of different aspects of fibre optical parametric amplifiers. After reviewing the fundamentals of the operation of this kind of amplifiers, the difficulties facing them are discussed. Among these issues, the problem of nonlinear cross-talk is investigated in more details. 1 experimentally proved that by reducing fibre length, it is possible to keep the crosstalk in a tolerable range. The amplification of 26 communication channels modulated at about 40 Gb/s aggregating to the total capacity of more than 1 Tb/s, while obtaining performance results comparable to those of erbium-doped fibre amplifiers may tone down the chief criticism on the parametric amplifiers. Two amplifiers with a record gain (60 dB for a two-pump amplifier) and a record bandwidth (270 nm in a one-pump amplifier) were demonstrated and it has been shown that there might be possibilities for improving the adverse effect of the Raman gain on the flatness of the gain spectra of the parametric amplifiers at the expense of losing some gain. A sample of a newly-developed bismuth-oxide highly-nonlinear fibre is used to construct a novel scheme for wavelength demultiplexing, and the possibility of simultaneous time- and wavelength demultiplexing is discussed.
published_date 2010-12-31T07:22:06Z
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score 11.057537

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