Analysis and optimization of intensity noise reduction in spectrum-sliced WDM systems using a saturated semiconductor optical amplifier

Abstract

Abstract-Theoretical and experimental results on the reduction of the intensity noise in spectrum-sliced wavelength-divisionmultiplexing systems using a saturated semiconductor optical amplifier (SOA) are presented. The influence of the injected current and the input power to the saturated SOA on the noise reduction and its bandwidth are studied. The optimum condition for a high noise suppression ratio and a large bandwidth is derived. For the optimum operation of the SOA, an increase of 13.5 dB in the intensity-noise-limited signal-to-noise ratio for a bitrate of 2.488 Gb/s and of 17.5 dB for a bitrate of 622 Mb/s are obtained experimentally in a single-stage SOA.Index Terms-Optical fiber communication, optical noise, semiconductor optical amplifier, wavelength-division multiplexing.

Filtering Effects in a Spectrum-Sliced WDM System Using SOA-Based Noise Reduction

“…The noise suppression offered by the saturated SOA is the result of small signal gain compression and intrachannel four-wave mixing (IC-FWM) [5], [8]. The spectral broadening due to the IC-FWM has been observed previously and can be significant depending on the input bandwidth and spectral shape [7].…”

“…One such approach uses the nonlinear gain compression of a saturated semiconductor optical amplifier (SOA) to suppress the intensity noise of the input thermal light [5]. This technique has the added benefit in that, ideally the SOA can also be used for signal modulation and amplification [6].…”

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

“…As discussed in [15], the extent of the achievable noise suppression is influenced by the operating point of the amplifier. To ensure optimum performance for our experiments, this dependence is measured as a function of amplifier drive current and input power.…”

“…The noise also depends on the shape and width of the input spectrum slice; it decreases with increasing spectral width [14]. Studies have shown that this intensity noise can be significantly reduced by introducing a saturated SOA at the transmitter before modulation [8], [15] (block diagram shown in Fig. 1).…”

A Designed Model About Amplification and Compression of Picosecond Pulse Using Cascaded Soa and Nolm Device

“…One such a approach uses the nonlinear gain compression of a saturated SOA to suppress the intensity noise of the input thermal light [10]. This technique has the added benefit, in which ideally the SOA can also be used for signal modulation and amplification [11].…”