Abstract
We present a comparative study of the capacity increase brought by bit- and power-loading discrete multi-tone (DMT) modulation for low-cost colorless transmitters. Three interesting reflective semiconductor optical amplifier (RSOA) based colorless transmitter configurations are compared: First, an amplified spontaneous emission (ASE) spectrum-sliced source; second, a self-seeded RSOA fiber cavity laser (FCL) and third, an externally seeded RSOA. With bit- and power-loaded DMT, we report record high line rates of 6.25, 20.1 and 30.7 Gbit/s and line rates of 4.17, 10.1 and 24.5 Gbit/s in a back-to-back and in a 25 km nonzero dispersion shifted fiber (NZDSF) transmission experiments for the three transmitter configurations, respectively. In all the experiments, BER (bit error ratios) below an FEC (forward error correction) limit of 7.5 × 10−3 were achieved.
Highlights
Maximizing the bit-rate of colorless, inexpensive and “poorly” performing transmitters has become a research topic on its own. This is of particular importance in wavelength division multiplexed (WDM) passive optical networks (PONs) that are considered a possible solution to cope with the capacity surge in access networks [1,2]
We study the impact of the WDM filter bandwidth in the remote node (RN), the fiber cavity length the current on the offered by the OnceOnce the optimum operation parameters and andbias the bias current onSNR
We considered cavity lengths with 15 m, 115 m and to a 1 km standard single mode fiberfiber (SSMF) to WDM-PONs in the range of meters upand to a 120 few mA
Summary
Maximizing the bit-rate of colorless, inexpensive and “poorly” performing transmitters has become a research topic on its own. Seeded RSOAs have already shown transmission beyond 20 Gbit/s with pulse amplitude modulation (PAM) [24] and more than 25 Gbit/s using discrete multi-tone (DMT) [14,25] In both cases, controlled offset filtering by a WDM filter or an additional delay line interferometer was required, which makes the system sensitive to any wavelength drift. Polar RZ PAM4 with delay interferometer optical signal processing has achieved 20 Gbit/s [32] Multicarrier schemes such as adaptive orthogonal frequency division multiplexing (Adaptive-OFDM) [33] have been implemented for improved performance of the externally seeded scheme. We compare these results with the optimum SNR of the ASE spectrum-sliced and externally seeded. We present the results of bit- and power-loaded DMT transmission experiments
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