Phase-preserving multilevel amplitude regeneration using modified nonlinear amplifying loop mirrors

Roethlingshoefer, Tobias; Hierold, Martin; Sponsel, K.; Onishchukov, G.; Schmauß, Bernhard; Leuchs, Gerd

doi:10.1109/ecoc.2010.5621545

Cited by 4 publications

(2 citation statements)

References 5 publications

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“…Erbium-doped fiber amplifier, is used, the influence of its gain, the coupler splitting ratio, the directional phase bias and the filter bandwidth and profile on the NALM transfer characteristics is already known [6,7,8]. The use of a saturable amplifier provides only one additional parameter -the amplifier saturation power.…”

Section: Optimization Of Nalm and Amplifier Parametersmentioning

confidence: 99%

“…Phase-preserving amplitude regeneration was considered to reduce amplitude fluctuations and, therefore, the origin of nonlinear phase noise for binary and quadrature phase-shift keying [4,5]. It has already been demonstrated that the periodic behaviour of the power transfer characteristic of a nonlinear amplifying loop mirror (NALM) is promising to be used also for multilevel formats [6].…”

Section: Introductionmentioning

confidence: 99%

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Using saturation effects in a nonlinear amplifying loop mirror for multilevel phase-preserving amplitude regeneration

Roethlingshoefer

Onishchukov

Schmauß

et al. 2011

2011 13th International Conference on Transparent Optical Networks

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The influence of amplifier gain saturation in nonlinear amplifying loop mirror on simultaneous phase-preserving regeneration of two power states has been studied. Numerical simulations have shown an improvement of up to 4 dB for the first, low-power state and 8 dB for the second high-power state. Compared to the linear amplifier case an improvement of 3 dB for the second power state has been achieved.

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Section: Optimization Of Nalm and Amplifier Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Using saturation effects in a nonlinear amplifying loop mirror for multilevel phase-preserving amplitude regeneration

Roethlingshoefer

Onishchukov

Schmauß

et al. 2011

2011 13th International Conference on Transparent Optical Networks

Self Cite

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Fiber-Based All-Optical Signal Regeneration

Matsumoto

2012

IEEE J. Select. Topics Quantum Electron.

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Multilevel Phase-Preserving Amplitude Regeneration Using a Single Nonlinear Amplifying Loop Mirror

Hierold

Roethlingshoefer

Sponsel

et al. 2011

IEEE Photon. Technol. Lett.

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A possibility of multilevel phase-preserving amplitude regeneration using a nonlinear amplifying loop mirror (NALM) is presented for the optical star-8 quadrature amplitude modulation (QAM) transmission format as an example. Two significantly different state power ratios for the QAM signal, 1:3 and 1:7, were investigated. After the optimization of the coupler splitting ratio and the directional phase bias in the NALM, amplitude noise can be efficiently suppressed at both signal power levels simultaneously. Bit-error-ratio (BER) simulations have shown that in a system limited by nonlinear phase noise, the deployment of the NALM allows an increase of the fiber launch power by 1.9 and 2.2 dB at a BER of 10(-3) for a state power ratio of 1:3 and 1:7, respectively. The regeneration limits due to imperfections of the power transfer characteristic are also discussed

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Phase-preserving multilevel amplitude regeneration using modified nonlinear amplifying loop mirrors

Abstract: Single and cascaded NALM performance was investigated in numerical simulations for star-8QAM. An amplitude noise reduction above 5dB was obtained for each signal state leading to an increase of up to 7dB in signal power, launched in a transmission line.

Cited by 4 publications

References 5 publications

Using saturation effects in a nonlinear amplifying loop mirror for multilevel phase-preserving amplitude regeneration

Using saturation effects in a nonlinear amplifying loop mirror for multilevel phase-preserving amplitude regeneration

Fiber-Based All-Optical Signal Regeneration

Multilevel Phase-Preserving Amplitude Regeneration Using a Single Nonlinear Amplifying Loop Mirror

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