High eye‐quality improvement by a single‐SOA regenerative wavelength converter

Ribeiro, Napoleão S.; Gallep, Cristiano M.; Conforti, Evandro

doi:10.1002/mop.24906

Cited by 2 publications

(12 citation statements)

References 19 publications

(34 reference statements)

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“…Different deterioration cases were obtained by combining these elements. The block for regeneration and wavelength conversion is the last one (Ribeiro et al, 2009a). In this block the modulated signal at λ 1 was converted to the wavelength of the laser 2 (λ 2 ), occurring regeneration and wavelength conversion simultaneously.…”

Section: Methodsmentioning

confidence: 99%

“…Two deterioration cases are studied. The first case is "LINK+SOA", which presented a medium quality input signal ( Figure 5(a)) with Q-factor of 5.7, presenting intense pulse distortion due to the intrinsic dispersion caused by the 18-km standard buried fiber link (Ribeiro et al, 2009a). The dispersion effect could be noted by the triangular form of the pulse.…”

Section: Eye Diagramsmentioning

confidence: 99%

“…In Figure 5(b), the regenerated output signal presents a higher eye opening, a reduction of the overshoots, and of the bit level (at both "1" and "0") variance, facts quantified by the Q-factor increasing to Q=10. The second deterioration case is "SOA" (Ribeiro et al, 2009a). In Figure 5(c), the eye diagram presents low quality (Q=4.8) due to the pattern dependence effect, overshoots, and the great amount of noise added to both bit levels by the SOA used as a booster.…”

Section: Eye Diagramsmentioning

confidence: 99%

“…The last deterioration case illustrated involves all the degeneration effects: "SOA+LINK+EDFA". For this last case, a bit rate of 7 Gbps NRZ as well as output signal attenuation are used (Ribeiro et al, 2009a). The Figure 8(a) illustrates the input signal which presents a higher overshoot caused by the SOA used as a booster.…”

Section: Eye Diagramsmentioning

confidence: 99%

“…Although good results can be obtained, this technique demonstrates to be complex since it used optical delay line and two SOAs. In this chapter, we introduce a more simple technique based on XGM (using just one SOA, an optical isolator, an optical circulator, and a CW laser) with easy robust operation at high speed reconfiguration (Ribeiro et al, 2008;Ribeiro et al, 2009a). The regeneration is based on the abrupt profile of the SOA cross-gain modulation efficiency, which is compressed at high input optical powers.…”

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confidence: 99%

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Wavelength Conversion and 2R-Regeneration in Simple Schemes with Semiconductor Optical Amplifiers

Ribeiro¹,

Gallep²,

Conforti³

2010

Advances in Lasers and Electro Optics

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Future optical networks may require both wavelength conversion and bit shape regeneration in an all-optical domain. The possibility of pulse reshaping while providing wavelength conversion may support new demands over medium and large distances links (Kelly, 2001). Indeed, during propagation the optical data signal suffers deterioration due to the amplified spontaneous emission (ASE) from optical amplifiers, pulse distortion from intrinsic dispersion, crosstalk, and attenuation. All-optical regenerators may be important components for the restoration of these signals, providing complexity and cost reductions with the avoidance of optoelectronic conversions. The regeneration could be 2R (reamplification and reshaping) or 3R, which also provide retiming to solve jitter (Simon et al., 2008). Several 3R regenerators using the semiconductor optical amplifier (SOA) have been proposed, such as cascaded SOAs setups (Funabashi et al., 2006) or SOA based Mach-Zehnder interferometers (MZI) (Fischer et al., 1999). However for small and medium distances systems, where the signal amplitude noise and distortions form the main problem and where jitter has fewer magnitudes, the simpler 2R processes can be adequate to keep signal quality (Simon et al., 1998). In addition, the SOA is a helpful device for both 2R-regeneration (Ohman et al., 2003) and wavelength conversion (Durhuus et al., 1996). Several techniques for 2R-regeneration based on SOAs have been proposed and tested, for example by using four-wave mixing (FWM) (Simos et al., 2004), cross-gain modulation (XGM) (Contestabile et al., 2005), integration within MZI (Wang et al., 2007), multimode interferometric SOA (Merlier et al., 2001), cross-phase modulation (XPM) with filtering (Chayet et al., 2004), and feed forward technique (Conforti et al., 1999). However, these techniques require complex designs and involve critical operation points, even the simplest ones based on XGM features. In addition, most of these techniques are not capable of wavelength conversion and regeneration simultaneously. Recently a regenerator based on cross-gain modulation was proposed using one SOA for wavelength conversion (in a counter-propagating mode) and another deeply saturated SOA (synchronized by an optical delay line) to achieve cross-gain compression (Contestabile 2005). This efficient approach has similarities with the all-optical feed-forward techniques. In addition, this regenerator could not done wavelength conversion if the wavelength of the

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Section: Methodsmentioning

confidence: 99%

Section: Eye Diagramsmentioning

confidence: 99%

Section: Eye Diagramsmentioning

confidence: 99%

Section: Eye Diagramsmentioning

confidence: 99%

mentioning

confidence: 99%

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