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Synthesis and regeneration of advanced optical modulation formats

Synthesis and regeneration of advanced optical modulation formats
Synthesis and regeneration of advanced optical modulation formats
This thesis explores all-optical regeneration techniques for advanced modulation formats with the overall aim of increasing the transmission reach of optical data links. In order to carry out this work, a number of tools were developed for the generation of advanced optical modulation formats. They included a combination of techniques involving the use of a delay line interferometer (DLI), time gating and coherent temporal superposition. A BPSK seed signal was used to generate QPSK (with a single DLI) and 16-QAM (with two concatenated DLIs) signals. The all-optical regeneration schemes studied in this thesis take several forms: phase preserving amplitude regeneration; phase only regeneration; and phase and amplitude regeneration, many of them including PSA configurations as building blocks.

Firstly, phase preserving amplitude regenerators were numerically and/or experimentally investigated. A multilevel amplitude regenerator in a PSA configuration, which was based on parametric pump-saturation, was analysed. A highly nonlinear fibre based dual-pump degenerate scheme was used to effect amplitude regeneration on a 4-level amplitude shift keying signal. Another amplitude regeneration scheme, this time based on optical injection locking, was also experimentally analysed, transmitting a BPSK signal over a 600-km long dark fibre link.

Secondly, a wavelength converting PSA-based phase regenerator for an M-PSK signal was developed by coherently summing the conjugated signal with the (M - 1)th phase harmonic, where M is the number of modulated symbols in the signal. This regenerator offers flexibility of operating power and harmonic mixing coefficient. Both numerical and experimental studies prove the feasibility of the proposed scheme. Another proposed regenerator, operating at the gain minima in a PSA configuration and working by coherently summing the signal to the π phase shifted (M+1)th harmonic, offers squeezing in both the amplitude and phase of the input signal. The latter work of this thesis introduces a phase regenerator which is designed to target higher-order M-PSK signals using a (simpler) M/2-PSK PSA-based regenerator.
University of Southampton
Jones, Liam
327a654f-5492-4d67-9fc9-76da4fa18061
Jones, Liam
327a654f-5492-4d67-9fc9-76da4fa18061
Petropoulos, Periklis
522b02cc-9f3f-468e-bca5-e9f58cc9cad7

Jones, Liam (2016) Synthesis and regeneration of advanced optical modulation formats. University of Southampton, Doctoral Thesis, 167pp.

Record type: Thesis (Doctoral)

Abstract

This thesis explores all-optical regeneration techniques for advanced modulation formats with the overall aim of increasing the transmission reach of optical data links. In order to carry out this work, a number of tools were developed for the generation of advanced optical modulation formats. They included a combination of techniques involving the use of a delay line interferometer (DLI), time gating and coherent temporal superposition. A BPSK seed signal was used to generate QPSK (with a single DLI) and 16-QAM (with two concatenated DLIs) signals. The all-optical regeneration schemes studied in this thesis take several forms: phase preserving amplitude regeneration; phase only regeneration; and phase and amplitude regeneration, many of them including PSA configurations as building blocks.

Firstly, phase preserving amplitude regenerators were numerically and/or experimentally investigated. A multilevel amplitude regenerator in a PSA configuration, which was based on parametric pump-saturation, was analysed. A highly nonlinear fibre based dual-pump degenerate scheme was used to effect amplitude regeneration on a 4-level amplitude shift keying signal. Another amplitude regeneration scheme, this time based on optical injection locking, was also experimentally analysed, transmitting a BPSK signal over a 600-km long dark fibre link.

Secondly, a wavelength converting PSA-based phase regenerator for an M-PSK signal was developed by coherently summing the conjugated signal with the (M - 1)th phase harmonic, where M is the number of modulated symbols in the signal. This regenerator offers flexibility of operating power and harmonic mixing coefficient. Both numerical and experimental studies prove the feasibility of the proposed scheme. Another proposed regenerator, operating at the gain minima in a PSA configuration and working by coherently summing the signal to the π phase shifted (M+1)th harmonic, offers squeezing in both the amplitude and phase of the input signal. The latter work of this thesis introduces a phase regenerator which is designed to target higher-order M-PSK signals using a (simpler) M/2-PSK PSA-based regenerator.

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Published date: May 2016

Identifiers

Local EPrints ID: 419063
URI: http://eprints.soton.ac.uk/id/eprint/419063
PURE UUID: 095bf0ae-8798-4f05-8ed5-a4f4caf8ecd5
ORCID for Periklis Petropoulos: ORCID iD orcid.org/0000-0002-1576-8034

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Date deposited: 28 Mar 2018 16:30
Last modified: 14 Mar 2019 01:50

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