Tunable fiber laser based on cascade structure consisted of an in-line M-Z and Sagnac loop

摘要

A tunable Erbium-doped fiber laser is proposed by cascading an in-line M-Z and Sagnac loop. Four laser output was gotten and were stable. With the combined effect of erbium-doped fiber gain spectrum and in-line M-Z structure transmission, gain maximum was at 1550nm waveband. At the same time, four laser output was gotten because of the frequency selecting effect of Sangac. When temperature increased from 30 °C to 150 °C, the center wavelength output of the first wavelength in the laser can be tuned from 1548.5nm to 1557.4nm. And the output power of the four wavelength is stable.