Abstract
We present extensive numerical simulations of an optical link deploying
four electroabsorption modulated lasers (EMLs) at 25 Gb/s over up to 40 km
of standard single-mode fiber. The receiver comprises a semiconductor optical
amplifier (SOA) as a preamplifier. We analyze the bit error ratio (BER) along
different link lengths under varying conditions such as output power and extinction
ratio of the EML transmitters, the noise figure of the SOA preamplifier and
the bit and word alignment of the four wavelength channels. We demonstrate
that the EML transmitters require a minimum extinction ratio of 8 to 10 dB
and a minimum output power of ${+}$2 to ${+}$4 dBm
in order to meet the BER requirements for 100 Gigabit Ethernet (100 GbE) using
4$\,\times\,$25-Gb/s physical
media dependent (PMD) devices. Furthermore, we show that single-channel performance
analyses can be used to estimate the behavior for multichannel amplification
in the SOA preamplifier.
© 2008 IEEE
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