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Continuous-wave short-cavity laser based on the Er- Yb-codoped phosphorosilicate optical fiber

In this work, a single-frequency continuous-wave fiber laser based on the developed in-house Er-Yb-codoped phosphorosilicate fiber was created as a reference signal source for the 1.55 μm-wavelength band operation. Absorption in this particular fiber at 976 nm was 500 dB/m and 60 dB/m at 1535 nm. Small-signal gain measured at 1550 nm was as high as 30 dB/m. The laser generation spectrum had a single narrow peak centered at the 1551.6 nm-wavelength with line width less than 100 kHz. The total cavity length of the laser was 2.5 cm.