A 40 GHz regeneratively and harmonically mode-locked erbium-doped fiber laser and its longitudinal-mode characteristics

Masato Yoshida, Taro Yaguchi, Shinji Harada, Masataka Nakazawa

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The oscillation characteristics of a 40 GHz, 1-3 ps regen-eratively and harmonically mode-locked erbium-doped fiber laser have been investigated in detail with respect to stability, linewidth, and mode hopping. We show that because the Q value of the microwave filter in the feedback loop is limited to around 1000, which is almost the same as that in a 10 GHz laser, the cavity length should not be greatly increased as this would result in as much as a fourfold increase in the number of longitudinal beat signals. We undertook a detailed stability analysis by using three cavity lengths, 60, 80, and 230m. The 80m long cavity greatly improved the long-term stability of the laser because the supermode noise was suppressed and there were not too many longitudinal modes. We measured the linewidth of the longitudinal mode of the laser using a heterodyne method, and it was less than 1 kHz. We also point out that there is a longitudinal mode hopping effect with time that is induced by very small changes in temperature.

Original languageEnglish
Pages (from-to)1166-1172
Number of pages7
JournalIEICE Transactions on Electronics
VolumeE87-C
Issue number7
Publication statusPublished - 2004 Jul

Keywords

  • Erbium-doped fiber amplifier
  • Fiber laser
  • Linewidth measurements
  • Mode-locking
  • Ultrashort optical pulses

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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