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Spectrally Efficient WDM Nyquist Pulse-Shaped Subcarrier Modulation Using a Dual-Drive Mach–Zehnder Modulator and Direct Detection
| Content Provider | Semantic Scholar |
|---|---|
| Author | Erkilinc, M. Sezer Thakur, Manoj P. Pachnicke, Stephan Griesser, Helmut Mitchell, J. E. Thomsen, Benn Charles Bayvel, Polina Killey, Robert I. |
| Copyright Year | 2016 |
| Abstract | High data transmission capacity is increasingly needed in shortand medium-haul optical communication links. Cost-effective wavelength division multiplexed (WDM) transceiver architectures, achieving high information spectral densities (ISDs) (>1 b/s/Hz) and using low-complexity direct detection receivers are attractive solutions for such links. In this paper, we assess the use of dual-drive Mach-Zehnder modulators (DD-MZMs), and compare them with in-phase quadrature (IQ)-modulators for generating spectrally-efficient single sideband Nyquist pulse-shaped 16-QAM subcarrier (N-SCM) modulation format signals. The impact of the extinction ratio (ER) of a modulator on the optical sideband suppression ratio (OSSR) was investigated for the SSB signals in WDM systems, together with the resulting impact on inter-channel crosstalk penalties. First, in back-to-back operation, an IQ-modulator with an ER of 30 dB and a DD-MZM with an ER of 18 dB were experimentally compared in a 6×25 Gb/s WDM system by varying the channel spacing. Following this comparison, 16 GHz-spaced 6×25 Gb/s WDM signal transmission was experimentally demonstrated using the DD-MZM. The experiment was performed using a recirculating loop with uncompensated standard single-mode fiber (SSMF) and EDFA-only amplification. The maximum achievable transmission distances for single channel and WDM signals were found to be 565 and 242 km, respectively, at a net optical ISD of 1.5 b/s/Hz. This is the first experimental comparison of such modulator types for SSB N-SCM signal generation and the highest achieved ISD using a DD-MZM in direct-detection WDM transmission. |
| Starting Page | 1158 |
| Ending Page | 1165 |
| Page Count | 8 |
| File Format | PDF HTM / HTML |
| DOI | 10.1109/JLT.2015.2497343 |
| Volume Number | 34 |
| Alternate Webpage(s) | http://discovery.ucl.ac.uk/1475174/1/Erkilinc_selection.pdf |
| Alternate Webpage(s) | https://doi.org/10.1109/JLT.2015.2497343 |
| Journal | Journal of Lightwave Technology |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
