10-Gb/s external modulation in optical CPFSK format

Takahide Sakamoto*, Tetsuya Kawanishi, Tetsuya Miyazaki, Masayuki Izutsu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


We demonstrated a synchronous control technique for external optical modulation in a format of continuous-phase frequency-shift keying (CPFSK) at 10 Gb/s. In this method, the FSK signal in the upper- or lower-sideband state synchronously shifts to the other state at the timing when their phases are the same. We investigated the accuracy of the timing control required for the synchronous control. Experimental results show that the allowable timing misalignment to keep power penalty of the receiver sensitivity less than 1 dB was more than 25 ps, 25% of each bit period.

Original languageEnglish
Pages (from-to)968-970
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number8
Publication statusPublished - 2006 Apr 15
Externally publishedYes


  • Continous-phase modulation
  • Demodulation
  • Electrooptic modulation
  • Frequency modulation
  • Optical fiber communication
  • Optical modulation

ASJC Scopus subject areas

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


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