[show abstract][hide abstract] 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 optical-filtering effects at the receiver. However, appreciable performance improvements can in principle be realized through optimized system and decoder design
Journal of Lightwave Technology 02/2007; 25(1):394-401. · 2.56 Impact Factor
[show abstract][hide abstract] ABSTRACT: We compare three semiconductor optical amplifier (SOA)-based noise suppression approaches employed in incoherent light spectrum-sliced systems. Although the SOA at the transmitter provides the best absolute noise suppression, it is susceptible to performance degradation in the presence of optical filtering and dispersion. Using the SOA at the receiver can provide good performance while avoiding these limitations, and may provide better value in last-mile access applications.
[show abstract][hide abstract] ABSTRACT: We compare three SOA-based noise suppression approaches employed in spectrum-sliced WDM systems. Although the SOA at the transmitter provides best noise suppression, the SOA at the receiver may provide better value in last-mile access applications.
[show abstract][hide abstract] 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 spectrum-sliced 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.
[show abstract][hide abstract] ABSTRACT: We present an experimental and numerical study into the filtering effects in a spectrum-sliced incoherent light system incorporating a semiconductor optical amplifier (SOA) for noise reduction. Techniques to reduce the signal degradation caused by post-SOA filtering are investigated. The alignment of the receiver/demultiplexer filter relative to the input spectrum-slice is demonstrated to have a noticeable impact on the received signal quality. We also show that the linewidth enhancement factor α of the SOA has a marked effect on the observed spectral distortion, which results in a strong dependence of the received signal quality on α. Our results illustrate the potential to improve system performance by optimized SOA design.
[show abstract][hide abstract] ABSTRACT: We review the use of a semiconductor optical amplifier for intensity noise reduction of incoherent sources and describe our recent experimental and theoretical work in this area. We focus in particular on understanding the physical mechanisms underpinning the noise reduction process and which govern the associated spectral broadening. We also describe in detail how onward filtering and transmission degrade the noise reduction and impact use of the technique within a high density spectrum-sliced system.
Signals, Systems and Computers, 2004. Conference Record of the Thirty-Eighth Asilomar Conference on; 12/2004
[show abstract][hide abstract] ABSTRACT: We present an experimental investigation into the effects of receiver filtering on the intensity noise in a spectrum-sliced incoherent light system incorporating semiconductor optical amplifier (SOA) based noise reduction. Spectral filtering of the SOA output degrades the signal quality, reducing the benefit offered by the SOA. However, narrow filters are required to reduce the crosstalk in high channel density systems. We characterize this tradeoff and find the optimum receiver bandwidth for varying channel spacing configurations in a spectrum-sliced wavelength-division multiplexed (WDM) system.
[show abstract][hide abstract] ABSTRACT: Experimental results of a simple, all-optical technique to reduce low-frequency intensity noise in an Er-Yb codoped fibre distributed feedback (DFB) laser are reported. This method utilises the gain dynamics of a saturated semiconductor optical amplifier (SOA) to produce a reduction of 30 dB in the relaxation oscillation noise component of the fibre laser.
[show abstract][hide abstract] ABSTRACT: We report the experimental results of a simple, all optical technique to reduce the relative intensity noise peak of a fibre distributed feedback laser. A noise reduction of 30 dB is achieved.
Annals of Physical and Rehabilitation Medicine. 01/2004;