1. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Parallel structure of DQPSK transmitter. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

2. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Serial structure of DQPSK transmitter. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

3. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. (a) Single-phase modulator structure. (b) Dual-drive MZIM structure as a phase modulation scheme. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

4. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Allocating vector si in a cycle of radius 1∕2rmax. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

5. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. 16-ary QAM signal: (a) grid presentation; (b) cycle presentation: r1=21∕2=1.4142, r2=101∕2=3.1622, r3=181∕2=4.2426. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

6. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Decomposition of constellation into three cycles: (a) outer, (b) middle, (c) inner. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

7. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. (a) Constellation of 4-ary signal in the outer cycle and (b) vectors of the corresponding output signal. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

8. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. (a) 8-ary signal of the middle cycle and (b) vectors of corresponding output signals. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

9. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. (a) Quaternary signal constellation of the inner cycle and (b) corresponding output signal vectors. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

10. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Simulated signal constellation of multilevel amplitude differential phase shift keying modulation scheme in (a) the linear regime and under ASE noise loading after transmission over 10 cascaded optically amplified spans and (b) nonlinear regime with launched power of 15dBm into standard single-mode optical fiber. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

11. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. (a) Simulink model of the dual-drive MZIM. Note that the sinusoidal driving signal sources are used for driving the modulator into carrier suppression. (b) Model of either Arm1 or Arm 2 as an optical phase modulated path of the optical waveguide. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

12. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Simulink implementation of the MZIM data modulator. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

13. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. MATLAB Simulink model of a dual-drive MZIM optical transmitter. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

14. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Carrier phase changes under the time-domain signals using a dual-drive MZIM transmitter. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

15. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Amplitude direct detection and photonic phase comparator with balance receiver for MADPSK demodulation. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

16. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. BER versus receiver sensitivity for MADPSK format and other modulation formats of duobinary and ASK (simulation). Legend: * far left=MDAPSK, ○ far right ASK, ○ duobinary 33%, duobinary 50%, * duobinary 67%. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

17. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Simulated BER versus launched power into standard single-mode fiber for MADPSK format of different pulse shapes. Legend: * far left=MDAPSK ̱ NRZ, ○ MADPSK ̱ RZ50 (50% pulse period RZ), * (right) MADPSK ̱ RZ33 (33% pulse period RZ). Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513

18. Date of download: 6/22/2016 Copyright © 2016 SPIE. All rights reserved. Error probability of MADPSK system versus the dispersion-length product with pulse shaping of NRZ, RZ 50%, and 67% bit period. Figure Legend: From: Generation and transmission of multilevel quadrature amplitude modulation formats using only one optical modulator: MATLAB Simulink simulation models Opt. Eng. 2009;48(4):045005-045005-10. doi:10.1117/1.3102513