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Novel optical orthogonally modulation scheme for superimposing DPSK signals on dark RZ signals |
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| Authors: | Yufeng Shao Yaoqiang Xiao Lili Cheng Huiwen Xu Yazhi Pi |
| Institution: | School of Computer and Communication, Hunan University, Changsha 410082, China |
| Abstract: | A configuration of transmitter for superimposing DPSK signals on dark RZ signals was proposed. The transmitter comprises two optical phase modulators and a delayed line Mach-Zehnder interferometer. A new orthogonally modulation format with tunable duty cycle and extinction ratio in the optical domain was generated and discussed. The results show that the proposed modulation format offers significant advantages in offering high spectral efficiency values, high extinction ratio, and requiring electronics with reduced bandwidth. |
| Keywords: | Differential phase-shift-keying (DPSK) Dark return-to-zero (dark RZ) Optical phase modulator Delayed line Mach-Zehnder interferometer |
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