Title :
A comparative study of DPSK and OOK WDM transmission over transoceanic distances and their performance degradations due to nonlinear phase noise
Author :
Mizuochi, Takashi ; Ishida, Kazuyuki ; Kobayashi, Tatsuya ; Abe, Junichiro ; Kinjo, Kaoru ; Motoshima, Kuniaki ; Kasahara, Kumio
Author_Institution :
Inf. Technol. R&D Center, Mitsubishi Electr. Corp., Kamakura, Japan
Abstract :
We have compared experimentally the transmission performance of return-to-zero differential phase-shift keying (RZ-DPSK) with RZ-ON-OFF keying (OOK), nonreturn-to-zero differential phase-shift keying (NRZ-DPSK), and NRZ-OOK for 100×10-Gb/s transmission with a spectral efficiency of 0.22 b/s/Hz over transoceanic distances. The Q degradation of the RZ-DPSK after transmission over 9180 km was 3 dB greater than that of RZ-OOK. The experimental results clearly showed the major cause of degradation for DPSK is not cross-phase modulation but self-phase modulation. The calculated nonlinear phase noise, i.e., the Gordon-Mollenauer effect, agreed with the experimental results. A distributed-Raman-amplifier assisted erbium-doped-fiber-amplified transmission line acted well in reducing the nonlinear phase noise.
Keywords :
Raman lasers; amplitude shift keying; differential phase shift keying; optical cables; optical fibre amplifiers; optical modulation; self-phase modulation; submarine cables; wavelength division multiplexing; 10 Gbit/s; 1000 Gbit/s; 9180 km; DPSK; Gordon-Mollenauer effect; OOK WDM; Q degradation; RZ-ON-OFF keying; distributed-Raman-amplifier; erbium-doped-fiber-amplified transmission line; nonlinear phase noise; nonreturn-to-zero differential phase-shift keying; performance degradation; self-phase modulation; spectral efficiency; transmission performance; transoceanic distance; Degradation; Differential phase shift keying; Differential quadrature phase shift keying; Fiber nonlinear optics; Nonlinear optics; Optical fiber communication; Optical receivers; Optical sensors; Phase noise; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2003.816849
