1,721,083 research outputs found
FWM-based Phase Preserving Amplitude Limiter employing Cancellation of SPM-Induced Distortions
No full textThe paper which uses this data is Bottrill, Kyle, Parmigiani, Francesca, Richardson, David and Petropoulos, Periklis (2016) FWM-based Amplitude Limiter Realizing Phase Preservation through Cancellation of SPM Distortions. OFC 2016 (doi:10.1364/OFC.2016.W4D.6).</span
Dataset for Optimisation of Amplitude Limiters for Phase Preservation Based on the Exact Solution to Degenerate Four-Wave Mixing
No full textAdopting an exact solution to four-wave mixing (FWM), wherein harmonic evolution is described by the sum of two Bessel functions, we identify two causes of amplitude to phase noise conversion which impair FWM saturation based amplitude regenerators: self-phase modulation (SPM) and Bessel-order mixing (BOM). By increasing the pump to signal power ratio, we may arbitrarily reduce their impact, realising a phase preserving amplitude regenerator. We demonstrate the technique by applying it to the regeneration of a 10 GBaud QPSK signal, achieving a high level of amplitude squeezing with minimal amplitude to phase noise conversion.
Dataset for Bottrill, Kyle, Hesketh, Graham, Parmigiani, Francesca, Richardson, David and Petropoulos, Periklis (2016) Optimisation of Amplitude Limiters for Phase Preservation Based on the Exact Solution to Degenerate Four-Wave Mixing. Optics Express</span
All-optical signal regeneration using four-wave mixing
No full textAll-optical signal processing schemes are being studied as promising candidates for adoption in future optical transmission systems, where they are hoped to offer benefits such as ultra-fast signal processing, reduced energy consumption and in some cases, multi-channel processing, supporting the deployment of new techniques such as optical burst switching and software defined networks.The topic of this thesis is the all-optical phase and amplitude regeneration of complex signals using four-wave mixing (FWM). Many schemes for all-optical signal regeneration which have so far been demonstrated expose a signal to some undesirable concomitant distortion during regeneration, grossly limiting their practicability. Therefore, the work in this thesis focuses upon eliminating these undesirable effects and pursuing the development of regenerators possessing more ideal performance.To this end, an amplitude preserving phase regenerator is first demonstrated using a phase sensitive amplifier (PSA) which functions through the use of an additional phase harmonic beyond that commonly used. The conclusions of this are extended to show that, given a means to coherently add a large number of phase harmonics of a signal, the phase transfer function of a PSA may be tailored exactly as pleased using a method similar to Fourier analysis.Adoption of an exact solution to degenerate FWM allows for the demonstration of phase preservation in a saturated, pump-degenerate FWM-based amplitude regenerator, enabled by adopting a high pump to signal power ratio. Understanding of the phase noise processes present in this amplitude regenerator leads to an alternative scheme for phase preservation being demonstrated, which functions by predistorting the signal using optical nonlinearities, before amplitude squeezing.This technique is then combined with a novel, single stage, wavelength converting idler-free PSA, to realise a system which is capable of regenerating both the phase and amplitude of a signal, and, by making use of the conjugating nature of both stages, allows for the negation of nonlinearity induced phase distortion between the two stages to realise a system which is greater than the sum of its two parts
SOA-based, idler-free phase quantiser
No full textEnergy consumption, system complexity and potential for integration are important factors when considering the suitability of all-optical processing, and depend upon both the scheme used and the medium in which it is performed. We have recently proposed a simple, wavelength-converting phase quantising scheme based on an idler-free phase-sensitive amplifier, notable for its flexibility of operating power and relative compactness [1]. We have demonstrated its performance for QPSK regeneration using an operating power of 24 dBm in 300 m of highly nonlinear fibre (HNLF). Despite offering low loss and high net nonlinearity, the size and geometry of the HNLF do not make it suitable for integration in a photonic device. Semiconductor optical amplifiers (SOAs) on the other hand, offer a particularly compact medium for nonlinear signal processing, combining an amplifier and nonlinear medium in one device. BPSK phase regeneration has been demonstrated in SOAs [2]; in this paper we experimentally demonstrate, to our knowledge, the first realisation of QPSK phase regeneration in SOAs, making use of the above idler-free scheme to realise a compact and more easily integrated QPSK regenerator
Phase Regeneration of QPSK Signal in SOA using Single-stage, Wavelength Converting PSA
No full textWe demonstrate, for the first time, all-optical phase regeneration of a quaternary phase shift keying (QPSK) signal through phase sensitive amplification (PSA) in nonlinear semiconductor optical amplifiers (SOAs), using a scheme only previously demonstrated in highly nonlinear fibre (HNLF). We make use of a highly tunable phase quantising scheme to circumvent some of the limitations imposed by the use of SOAs and show that it may function in either a conjugating or non-conjugating manner.
Dataset for Bottrill, K., Kakarla, R., Parmigiani, F., Venkitesh, D. and Petropoulos, P. (2015) Phase regeneration of QPSK signal in SOA using single-stage, wavelength converting PSA. IEEE Photonics Technology Letters, 1. (doi:10.1109/LPT.2015.2489843)</span
Multi-channel phase regenerator based on polarization-assisted phase-sensitive amplification
Full text linkWe propose and demonstrate simultaneous phase regeneration of six nonreturn-to-zero binary phase shift keying signals in a single nonlinear medium. The regenerating system,which exhibits binary steplike phase transfer functions, uses four-wave mixing in degenerate dual-pump vector parametric amplifiers implemented in the same nonlinear optical fiber, followed by polarization filtering. Bit-error-ratio measurements confirm optical-signal-to-ratio improvement and negligible crosstalk across all the regenerated channels, which were impaired at the regenerator input by broadband phase noise.</span
Dataset for PAM4 transmission over 360 km of fibre using optical phase conjugation
No full textDataset supports:
Bottrill, K. et al (2018). PAM4 Transmission over 360km of Fibre using Optical Phase Conjugation. OSA Continuum. </span
PAM4 transmission over 360km of fibre using optical phase conjugation
No full textWe demonstrate the transmission of 3x20Gbaud PAM4 signals over a 360km, field-deployed, amplified transmission link. We compare dispersion compensation using optical phase conjugation (OPC) to dispersion compensating fibre (DCF) and find an improvement in received bit error ratio of an order of magnitude using our OPC implementation
Dataset supporting the publication "AMI for Nonlinearity Mitigation in O-Band Transmission"
No full textThis dataset is supporting the publication:
N. Taengnoi, K. R. H. Bottrill, C. Lacava, D. J. Richardson and P. Petropoulos, "AMI for Nonlinearity Mitigation in O-Band Transmission," 2019 Optical Fiber Communications Conference and Exhibition (OFC), San Diego, CA, USA, 2019, pp. 1-3.
https://doi.org/10.1364/OFC.2019.Th2A.33
The data includes excel files that utilise the alternate mark inversion (AMI) scheme to mitigate the nonlinearity in O-band transmission. The results after transmission over 60km of SMF show that AMI outperforms the duobinary and on-off keying formats.
The data for each figure is contained within a directory of the same name. Data files are named after the Figure they correspond to and contain the data necessary to recreate the plots. Data for Fig-1 is not included, as it is a schematic. Data for Fig-3-c is also not included in the dataset as the data is obtained from screenshots.
Data is accessible via CC BY license</span
Phase regeneration of QPSK signal in SOA using single-stage, wavelength converting PSA
Full text linkWe demonstrate, for the first time, all-optical phase regeneration of a quaternary phase shift keying (QPSK) signal through phase sensitive amplification (PSA) in nonlinear semiconductor optical amplifiers (SOAs), using a scheme only previously demonstrated in highly nonlinear fibre (HNLF). We make use of a highly tunable phase quantising scheme to circumvent some of the limitations imposed by the use of SOAs and show that it may function in either a conjugating or non-conjugating manner
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