Semiconductor optical amplifiers(SOAs) application are not as widespread as one would expect. The reason lies in the
severe interchannel crosstalk experienced by the signals in a wavelength-division multiplexing(WDM) link using SOA.
Theoretical study on channel crosstalk due to gain saturation in SOAs is presented. A significantly higher penalty is paid
at more channels because of the gain saturation characteristic of SOAs. Crosstalk mitigation techniques in SOAs are
studied. We have demonstrated theoretically and experimentally that a CW light propagating with signal can mitigate
crosstalk in SOAs at channel rates of 40Gb/s. Reduction of crosstalk in SOA by amplifying dispersed WDM signals is
confirmed experimentally. Based on the results of the experiment, a novel dispersion management scheme is proposed to
prevent the interchannel crosstalk caused by cross-gain modulation.
Optical crosstalk imposes a major limit to the practical implementation of optical cross-connects (OXCs). Inraband
crosstalk contributions in three types of OXCs topologies based on the dilated Benes (DB) and generally modified dilated
Benes (GMDB) networks are investigated and compared. Numerical simulation and experimental results confirm that
OXCs based on GMDB networks can eliminate intraband crosstalk influence effectively compared with OXCs based on
DB networks.
Optical crosstalk imposes a major limit to the practical implementation of optical cross-connects (OXCs). Intraband crosstalk characteristics of OXCs based on the dilated Benes (DB) and generally modified DB (GMDB) networks are investigated and compared. Numerical simulation and experimental results confirm that OXCs based on GMDB networks can eliminate intraband crosstalk influence effectively compared with OXCs based on DB networks.
Intraband crosstalk characteristics of the dilated Benes (DB) network and generally modified dilated Benes (GMDB) network are studied experimentally. The signal-to-noise ratio (SNR) characteristic of the GMDB network is estimated and compared with the DB network. Bit error rate (BER) produced by crosstalk is experimentally investigated and compared. Results show that the GMDB network can eliminate crosstalk influence effectively even though the crosstalk coefficient of the switching element is high.
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