|Commenced in January 2007||Frequency: Monthly||Edition: International||Publications Count: 29524|
 N. Avlonitis E. M. Yeatman M. Jones "Multilevel amplitude shift keying in dispersion uncompensated optical systems" , UK Optoelectronics, IEE Proceedings - Publication Date: 12 June 2006 Volume: 153 ,
 Michael Eiselt "Cost-effective 100Gbps Optical Modulation Format for Metro Networks", Brian Teipen, Presentations of the 9th ITG Conference “Photonische Netze” Germany Leipzig 2008.
 Majed Omar Al-Dwairi, Ziad A. AlQadi "Low-cost Multilevel Formats for 100Gbps Transmission with Direct Detection" , International Review of Physics (IREPHY) vol.3 N.5, october 2009,p
 Annika Dochhan, Majed Omar Al-Dwairi, and Werner Rosenkranz "Optimization of Cost Efficient Multilevel-ASK Modulation Formats under the Constraint of Chromatic Dispersion" OFC 2010, paper OMJ7, 23.-25.03.2010, San Diego, California, USA
 S. K. Andoh Okai "Investigation of multi-Level Modulation Formats with Polarisation Multiplexing in Optical Communication Systems" Master Thesis, Christian-Alberchts University, Germany 2009.
 M. Ohm and J. Speidel, “Quaternary optical ASK-DPSK and receivers with direct detection (ASK-DPSK/DD),” IEEE Photon. Technol. Lett. 15, pp. 159–161, Jan. 2003.
 X. Liu, X. Wei, Y.-H. Kao, J. Leuthold, C. Doerr, and L. Mollenauer, “Quaternary differential-phase amplitude-shift-keying for DWDM transmission,” in Proc. ECOC’03, paper Th 2.6.5, 2003.
 S. Hayase, N. Kikuchi, K. Sekine, and S. Sasaki, “Proposal of 8-state per symbol (binary ASK and QPSK) 30-Gbit/soptical modulation / demodulation scheme,” in Proc. ECOC’03, paper Th 2.6.4, 2003.
 Ohm, M; Speidel, J: "Optimal amplitude and chromatic dispersion tolerances of optical quaternary ASK-DPSK and 8-ary ASK-DQPSK", Asia-Pacific Optical Communication (APOC). Beijing, China, November 2004, paper 5625-38.
 T. Tokle et al, “Penalty-free Transmission of Multilevel 240 Gbit/s RZDQPSK- ASK using only 40 Gbit/s Equipment”, in Proc. ECOC 2005, post deadline paper Th4.1.6, Vol. 6, pp. 11-12.
 M. Serbay et al, “Experimental Investigation of RZ-8DPSK at 3x10.7Gbps”, in Proc. LEOS 2005, paper We3, pp. 483-484.
 S. S. Walkin, "Multilevel Signaling for Increasing the Capacity of High- Speed Optical Communication Systems", Ph.D. thesis, University of Alberta, Canada, 1997.
 E. Collett, Polarized light: Fundamentals and Applications, Marcel Dekker, 1993, ISBN 0-8247-8729-3.
 D. B. Chenault, "Polarization: Nomenclature and Background", in Conference 6682 as part of SPIE's Optics + photonics, San Diego, California, USA, August 2007.