Title :
A finesse-enhanced Er-doped-fiber ring resonator
Author :
Okamura, Haruo ; Iwatsuki, Katsumi
Author_Institution :
NTT Transmission Syst. Lab., Kanagawa, Japan
fDate :
11/1/1991 12:00:00 AM
Abstract :
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
Keywords :
erbium; fibre lasers; optical losses; ring lasers; spectral analysers; spectral line breadth; beat noise; finesse-enhanced Er-doped-fiber ring resonator; high-resolution optical spectrum analyzer; mode-filtered heterodyne method; optical amplification; resonant-linewidth measurements; resonator passband; round-trip optical loss; two-coupler-type; Light sources; Noise measurement; Optical fiber filters; Optical filters; Optical losses; Optical mixing; Optical noise; Optical ring resonators; Resonance; Stimulated emission;
Journal_Title :
Lightwave Technology, Journal of
