# Frequency Comb-Based WDM Transmission Systems Enabling Joint Signal Processing
## 5 Conclusions and Outlook
### Future Outlook
(2015) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] On the impact of carrier phase estimation on phase correlations in coherent fiber transmission. In Proceedings of the Tyrrhenian International Workshop on Digital Communications, Florence, Italy, 22 September 2015. * [PERSON] et al. (2017) [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Nonlinear mitigation on subcarrier-multiplexed PM-16 QAM optical systems. _Opt. Exp._**2017**, _25_, 4298-4311. [CrossRef] [PubMed]
* [PERSON] et al. (2015) [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON], [PERSON] DSP-complexity Reduction of QAM-based Coherent Optical Networks Enabled by Seed Lightwave Distribution. In Proceedings of the Conference on Lasers and Electro-Optics (CLEO), San Jose, CA, USA, 10-15 May 2015; p. SW1M.7. * [PERSON] et al. (2016) [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON] [PERSON] Seed Lightwave Distribution over 1600 km for 64 QAM-Based Coherent WDM Optical Networks with Low DSP-complexity. In Proceedings of the European Conference on Optical Communication (ECOC), Dusseldorf, Germany, 18-22 September 2016; p. W.4.P.1.SC5.12. * [PERSON] (2008) [PERSON] Optical frequency combs generated by four-wave mixing in optical fibers for astrophysical spectrometer calibration and metrology. _Opt. Express_**2008**, _16_, 13267-13275. [CrossRef] [PubMed]
* [PERSON] (2005) [PERSON] Phase noise-tolerant synchronous QPSK/BPSK baseband-type intradyne receiver concept with feedforward carrier recovery. _J. Lightw. Technol._**2005**, _23_, 802-808. [CrossRef]
* [PERSON] et al. (2016) [PERSON]; [PERSON]; [PERSON] Joint-Polarization Phase-Noise Estimation and Symbol Detection for Optical Coherent Receivers. _J. Lightw. Technol._**2016**, _34_, 4394-4405. [CrossRef]
* [PERSON] et al. (2012) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Joint Digital Signal Processing Receivers for Spatial Superchannels. _IEEE Photon. Technol. Lett._**2012**, _24_, 1957-1960. [CrossRef]
* [PERSON] et al. (2013) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON]. Single DPLL joint carrier phase compensation for few-mode fiber transmission. _IEEE Photon. Technol. Lett._**2013**, _25_, 1381-1384. [CrossRef]
* [PERSON] et al. (2014) [PERSON] [PERSON]; [PERSON] [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON]. 28-GBd 32 QAM FMF transmission with low complexity phase estimators and single DPLL. _IEEE Photon. Technol. Lett._**2014**, _26_, 765-768. [CrossRef]
* [PERSON] et al. (2013) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Joint digital signal processing for superchannel coherent optical communication systems. _Opt. Exp._**2013**, _21_, 8342-8356. [CrossRef] [PubMed]
* [PERSON] et al. (2012) [PERSON]; [PERSON]; [PERSON]; [PERSON]. Joint-Polarization and Joint-Subchannel Carrier Phase Estimation for 16-QAM Optical Systems. _J. Lightw. Technol._**2012**, _30_, 3185-3191. [CrossRef]
* [PERSON] et al. (2017) [PERSON]; [PERSON]; [PERSON]; [PERSON] [PERSON] Phase-Noise Compensation for Spatial-Division Multiplexed Transmission. In Proceedings of the Optical Fiber Communication Conference (OFC), Los Angeles, CA, USA, 19-23 March 2017; p. Th4C.7. * [PERSON] et al. (2017) [PERSON]; [PERSON]; [PERSON] [PERSON]; [PERSON] Pilot Distributions for Phase Tracking in Space-Division Multiplexed Systems. In Proceedings of the European Conference on Optical Communication (ECOC), Gothenburg, Sweden, 17-21 September 2017, p. P.1 SC3.48. * (107) [PERSON] Digital Coherent Optical Receivers: Algorithms and Subsystems. _IEEE J. Sel. Top. Quantum Electron._**2010**, _16_, 1164-1179. [CrossRef]
* (108) [PERSON]; [PERSON]; [PERSON] Hardware-Efficient Coherent Digital Receiver Concept With Feedforward Carrier Recovery for M-QAM Constellations. _J. Lightw. Technol._**2009**, _27_, 989-999. [CrossRef]
* (109) [PERSON]; [PERSON] _Digital Communications_, 5 th ed. ; McGraw-Hill Higher Education: New York, NY, USA, 2008.