Title :
Improvement of power margin in 10-Gb/s SOA-boosted transmission systems using phase-modulated duobinary modulation formats
Author :
Kim, Yonggyoo ; Lee, Yongnoh ; Lee, Jaehoon ; Kim, Sungki ; Jeong, Jichai
Abstract :
We theoretically investigate the performance of 10-Gb/s semiconductor optical amplifier (SOA)-boosted transmission systems using the nonreturn-to-zero (NRZ), conventional duobinary, and phase-modulated (PM)-duobinary modulation formats. NRZ and conventional duobinary modulation formats are based on the intensity modulation. When the NRZ and conventional duobinary modulation formats are used, the nonlinear characteristics of SOA severely distort the signals. On the other hand, the PM-duobinary modulation format is based on differential binary phase-shift-keying modulation. When the PM-duobinary modulation format is employed, the nonlinear characteristics of SOA scarcely affect the signals which maintain a constant intensity in SOAs. Using the PM-duobinary modulation format, we can significantly improve the power margin in SOA-boosted transmission systems.
Keywords :
differential phase shift keying; intensity modulation; optical communication equipment; optical fibre communication; optical modulation; phase modulation; semiconductor optical amplifiers; 10 Gbit/s; SOA-boosted transmission systems; conventional duobinary modulation format; differential binary phase-shift-keying modulation; intensity modulation; nonreturn-to-zero modulation format; phase-modulated duobinary modulation formats; power margin; semiconductor optical amplifier; Chirp; Laboratories; Nonlinear distortion; Optical amplifiers; Optical distortion; Optical signal processing; Optical transmitters; Phase modulation; Scanning probe microscopy; Semiconductor optical amplifiers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2004.833939
