Pattern compensation in SOA-based gates

Original citationDailey, J.M.; Power, M.J.; Webb, R.P.; Manning, R.J.; (2011) 'High- Abstract: We report on the novel all-optical generation of duobinary (DB) and alternate-mark-inversion (AMI) modulation formats at 42.6 Gb/s from an input on-off keyed signal. The modulation converter consists of two semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer gates. A detailed SOA model numerically confirms the operational principles and experimental data shows successful AMI and DB conversion at 42.6 Gb/s. We also predict that the operational bandwidth can be extended beyond 40 Gb/s by utilizing a new pattern-effect suppression scheme, and demonstrate dramatic reductions in patterning up to 160 Gb/s. We show an increasing trade-off between pattern-effect reduction and mean output power with increasing bitrate.

Section: 6 Gb/s Experimental Resultsmentioning

confidence: 99%

Section: 6 Gb/s Experimental Resultsmentioning

confidence: 99%

High-bandwidth generation of duobinary and alternate-mark-inversion modulation formats using SOA-based signal processing

Dailey¹,

Power²,

Webb³

et al. 2011

“…an AND gate) operating at the same bitrate due to the increased excitation frequency of the SOAs in an XOR configuration [14]. This requirement will be difficult to fulfill at speeds above 40 Gbps, however, a compensation scheme whereby inverted data is co-injected into the SOAs [12,21,22] may be useful in reducing the patterning.…”

Section: Numerical Simulation and Resultsmentioning

confidence: 99%

“…We anticipate many of the transmission benefits of AMI modulation to be maintained with such performance. Furthermore, we expect that improved modulation converter performance may be possible at 40 Gbps and even higher bitrates by modifying previously demonstrated pattern compensation schemes [12,21,22] .…”

Section: Discussionmentioning

confidence: 99%

All-optical technique for modulation format conversion from on-off-keying to alternate-mark-inversion

Dailey¹,

Webb²,

Manning³

2010

Self Cite

Access to the full text of the published version may require a subscription. Abstract: We propose and numerically investigate for the first time a novel all-optical on-off-keying to alternate-mark-inversion modulation format converter operating at 40 Gbps employing a semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer (MZI). We demonstrate that this SOA-MZI operates as a pulse subtractor, and in the absence of patterning will produce perfectly phase inverted pulses regardless of the individual SOA phase excursions. RightsWe use a comprehensive computer model to illustrate the impact of patterning on the output phase modulation which is quantified through the definition of the phase compression factor.

“…This configuration has numerous advantages, including high stability, possibility of integration and low switching power. On the other hand, it is well known that such switches still suffer from nonlinear PEs [4] that are partly responsible for the large observed power penalties [1,2] and would require additional effort to eliminate [5,6,7,8]. As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Simple and efficient methods for the accurate evaluation of patterning effects in ultrafast photonic switches

Ding

Peucheret

et al. 2010

Although patterning effects (PEs) are known to be a limiting factor of ultrafast photonic switches based on semiconductor optical amplifiers (SOAs), a simple approach for their evaluation in numerical simulations and experiments is missing. In this work, we experimentally investigate and verify a theoretical prediction of the pseudo random binary sequence (PRBS) length needed to capture the full impact of PEs. A wide range of SOAs and operation conditions are investigated. The very simple form of the PRBS length condition highlights the role of two parameters, i.e. the recovery time of the SOAs as well as the operation bit rate. Furthermore, a simple and effective method for probing the maximum PEs is demonstrated, which may relieve the computational effort or the experimental difficulties associated with the use of long PRBSs for the simulation or characterization of SOA-based switches. Good agrement with conventional PRBS characterization is obtained. The method is suitable for quick and systematic estimation and optimization of the switching performance.