546 km, 140 Mbit/s FSK Coherent Transmission Experiment Through 10 Cascaded Semiconductor Laser Amplifiers

S. Ryu, H. Taga, S. Yamamoto, K. Mochizuki, H. Wakabayashi

Research output: Contribution to journalArticle

2 Citations (Scopus)


The effect of the spontaneous emission noise on coherent systems in a multistage semiconductor laser amplifier repeater system is experimentally examined. By appropriate adjustment of the input power level to each amplifier, 546 km FSK transmission at 140 Mbit/s using 10 cascaded amplifiers is demonstrated without power penalty.

Original languageEnglish
Pages (from-to)1682-1684
Number of pages3
JournalElectronics Letters
Issue number25
Publication statusPublished - 1 Sep 1989



  • FSK
  • Optical communications
  • Optical transmission
  • Semiconductor lasers

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