Improving signal quality in a spectrum-sliced WDM system using SOA-based noise reduction

McCoy, A.D.; Horák, Péter; Thomsen, Benn C.; Ibsen, M.; Mokhtar, M.R.; Richardson, David J.

doi:10.1109/lpt.2004.837916

Cited by 22 publications

(6 citation statements)

References 10 publications

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“…1, the measured RIN values at the SOA input, output, and decoder path outputs are shown in Table I. Simulation results for channel 1 are also given and were obtained using a travelingwave SOA model based on the amplifier carrier density and field equations as described in [16]. As expected, simulation values show good agreement with the experiment.…”

Section: B Results and Discussionsupporting

confidence: 54%

Feasibility Study of SOA-Based Noise Suppression for Spectral Amplitude Coded OCDMA

McCoy

Ibsen

Horák

et al. 2007

J. Lightwave Technol.

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Abstract-We investigate the benefits of employing a saturated semiconductor optical amplifier (SOA) to reduce the optical noise in an incoherent light optical code division multiple access (OCDMA) system. In the context of spectrum slicing, SOA-based noise suppression has shown significant potential in enhancing the signal quality of noisy light. In this paper, we evaluate the viability of the technique for spectral amplitude coded OCDMA and show that the benefits of SOA-based noise suppression do not extend readily to this application due to post-SOA opticalfiltering effects at the receiver. However, appreciable performance improvements can in principle be realized through optimized system and decoder design.Index Terms-Optical code division multiple access (OCDMA), optical noise, semiconductor optical amplifier (SOA).

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Section: B Results and Discussionsupporting

confidence: 54%

Feasibility Study of SOA-Based Noise Suppression for Spectral Amplitude Coded OCDMA

McCoy

Ibsen

Horák

et al. 2007

J. Lightwave Technol.

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“…Good agreement between simulation and experiment indicate that this approximation is valid in most cases for the high signal strengths considered in this study. Some consequences of ignoring ASE are discussed in Section IV, and also in [20] and [21].…”

Section: Spectral Distortion and Post-soa Filteringmentioning

confidence: 99%

“…This reduces the impact of post-SOA filtering, resulting in improved RIN. For α = 0, slight broadening occurs in the tails of the spectrum [20], due to remaining FWM contributions. These simulation results clearly show that the post-SOAfiltered signal quality can be improved significantly by reducing the linewidth-enhancement factor.…”

Section: B Soa Design Optimizations 1) Linewidth-enhancement Factormentioning

confidence: 99%

Noise suppression of incoherent light using a gain-saturated SOA: implications for spectrum-sliced WDM systems

McCoy

Horák

Thomsen

et al. 2005

J. Lightwave Technol.

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116

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Abstract-In this paper, we present an experimental and numerical study of semiconductor optical amplifier (SOA)-based noise suppression and its relevance to high-channel-density spectrumsliced wavelength-division-multiplexed systems. We show that the improvement in signal quality is accompanied by spectral distortion, which renders it susceptible to deterioration in the presence of subsequent optical filtering. This phenomenon originates from the loss of intensity correlation between spectral components of the SOA output when the signal spectrum is altered. As a consequence, a design tradeoff is introduced between intensity noise and crosstalk in high-channel-density systems. These adverse effects can be overcome by optimized SOA design, resulting in a significant improvement in signal quality.Index Terms-Optical noise, semiconductor optical amplifier (SOA), spectrum slicing, wavelength-division multiplexing(WDM).

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“…The term α is closely related to spectral distortion (broadening) of input signal (Agrawal and Olsson 1989;McCoy et al 2005) in an SOA. It influences the dynamics of semiconductor and hence plays an important role in describing the device's performance under CW operation as well as frequency chirp under high speed modulation (Schneider et al 2004).…”

Section: Carrier Induced Materials Dispersion and αmentioning

confidence: 99%

Mode Amplification in Inhomogeneous QD Semiconductor Optical Amplifiers

2006

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We present modelling results investigating the carrier dynamics of an SOA composed of an inhomogeneous array of quantum dots designed to produce broad gain amplification when optically pumped. We use a set of rate equations that describe the QDs inhomogeneity and include an energy dependent occupation factor within each inhomogeneously broadened level and numerically solve them with the propagation equation to investigate the amplification of optical signals in the waveguide. By treating the carrier filling according to the quasi-equilibrium distribution, we are able to investigate the effect of band-filling (BFE) on the gain and refractive index. The linewidth enhancement factor (α) is computed and analysed with respect to optical signal intensity as well as electrical current density.

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Improving signal quality in a spectrum-sliced WDM system using SOA-based noise reduction

Cited by 22 publications

References 10 publications

Feasibility Study of SOA-Based Noise Suppression for Spectral Amplitude Coded OCDMA

Feasibility Study of SOA-Based Noise Suppression for Spectral Amplitude Coded OCDMA

Noise suppression of incoherent light using a gain-saturated SOA: implications for spectrum-sliced WDM systems

Mode Amplification in Inhomogeneous QD Semiconductor Optical Amplifiers

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