Abstract
We experimentally investigate the transmission performance of 56 Gb/s four-level pulse amplitude modulation (PAM-4) over 30-km standard single mode fiber (SMF) using a C-band EML for low-cost metro and short-reach wavelength division multiplexing (WDM) applications. Bit error rate (BER) performance below the HD-FEC threshold is achieved for up to 30-km maximum reported distance without employing dispersion compensation fiber (DCF) in the link.
Highlights
Bit-rates up to 100 Gb/s and 400 Gb/s are currently investigated due to the ever-increasing capacity demands in metro and short-reach segments of the network [1]
Low-cost deployment is essential in such cost-sensitive network segments, and cost-effective solutions that make use of C-band (i.e., 1550-nm wavelength) that do not imply the deployment of in-line dispersion compensating fiber (DCF) spans are desired
digital signal processing (DSP) we we investigated investigated two cases: cases: (i) when the the multi-modulus multi-modulus algorithm (MMA) used for the finite impulse response (FIR) taps convergence is set to deliver a four level signal signal at at its its output; output; and (ii) when the MMA is modified so as its output corresponds to a seven-level poly-binary signal instead of a four-level one due to strong filtering imposed by the CD dominating the link
Summary
Bit-rates up to 100 Gb/s and 400 Gb/s are currently investigated due to the ever-increasing capacity demands in metro and short-reach segments of the network [1]. Low-cost deployment is essential in such cost-sensitive network segments, and cost-effective solutions that make use of C-band (i.e., 1550-nm wavelength) that do not imply the deployment of in-line dispersion compensating fiber (DCF) spans are desired. This approach would reduce the sensitivity requirements of such links and avoid the deployment of in-line amplifiers due to minimum fiber attenuation in that region. Much research effort has been put forth to investigate and develop intensity-modulated and direct-detection (IM/DD) 100-Gb/s optical links targeting a distance of up to 80 km over standard single mode fiber (SSMF) without the use of dispersion compensating fiber. The most recent transmission records in terms of data-rate and maximum transmission distance achieved involve the employment of high-performance Mach-Zenhder modulators (MZMs) and
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