1500-km SSMF transmission of mixed 40-Gb/s CS-RZ duobinary and 100-Gb/s CS-RZ DQPSK signals

Zhaohui Li, Linghao Cheng, Yanfu Yang, Chao Lu, Pak Tao Lau, Hwa Yaw Tam, Ping Kong Alexander Wai, Chao Wang, Xiaogeng Xu, Jian Deng, Qianjing Xiong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


We demonstrated transmission of eight channelsof 200-GHz channel spacing and 100-Gb/s carrier-suppressed return-to-zero (CS-RZ) differential quadrature phase-shift keying (DQPSK) signals together with eight channels of 40-Gb/s CS-RZ duobinary (DRZ) signals also with 200-GHz channel spacing in order to improve the optical spectral efficiency of the wavelength-division-multiplexing system. Each DRZ channel is inserted in the middle of two adjacent CS-RZ DQPSK channels. A bit-error rate (BER) of less than 5E-4 is achieved for the 40-Gb/s DRZ channel after 1500-km SSMF transmission while a BER of 1E-3 is achieved for the 100-Gb/s CS-RZ DQPSK signals.
Original languageEnglish
Pages (from-to)1148-1150
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number16
Publication statusPublished - 15 Aug 2009


  • Carrier-suppressed return-to-zero (CS-RZ)
  • Differential quadrature phase-shift keying (DQPSK)
  • Mixed transmission
  • Modulation format
  • Optical duobinary

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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