A Finesse-Enhanced Er-Doped-Fiber Ring Resonator

Haruo Okamura, Katsumi Iwatsuki

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


A two-coupler-type Er-doped-fiber ring resonator is proposed which compensates for the round-trip optical loss by optical amplification thereby attaining a high finesse. Also proposed is a mode-filtered heterodyne method for resonant-linewidth measurements which does not demand narrow-linewidth light sources but uses the beat noise between two uncorrected lights filtered by the resonator passband. With the proposed measurement method, a finess -500 and a resonant linewidth -17 kHz are confirmed from the Er-doped fiber ring resonator. The ring resonator is operated as a high-resolution optical spectrum analyzer.

Original languageEnglish
Pages (from-to)1554-1560
Number of pages7
JournalJournal of Lightwave Technology
Issue number11
Publication statusPublished - 1991 Nov


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