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A finesse-enhanced Er-doped-fiber ring resonator

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2 Author(s)
Okamura, H. ; NTT Transmission Syst. Lab., Kanagawa, Japan ; Iwatsuki, K.

A two-coupler-type Er-doped-fiber ring resonator that compensates for the round-trip optical loss by optical amplification is proposed. 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 uncorrelated lights filtered by the resonator passband. With this method, a finesse ⩾500 and a resonant linewidth ⩽17 kHz were confirmed from the Er-doped fiber ring resonator. The ring resonator was operated as a high-resolution optical spectrum analyzer

Published in:

Lightwave Technology, Journal of  (Volume:9 ,  Issue: 11 )

Date of Publication:

Nov 1991

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