Acta Photonica Sinica, Volume. 42, Issue 12, 1482(2013)
Thermally Expanded Core Fiber Based MZ Filter and Its Application in Widely Tunable Erbiumdoped Fiber Laser
Thermally expanded core fibers were made by heating a singlemode fiber locally with hydrogenoxygen flame. An all fiber MZ filter was fabricated using the thermally expanded core fiber, and it was inserted into a Sagnac filter to make a new structure of tunable fiber Sagnac filter which output spectrum was the uncorrelated superposition between the Sagnac and the MZ interferences. With the new structure Sagnac fiber filter, a tunable erbiumdoped fiber laser was made and investigated experimentally. Tunable output was obtained by adjusting a polarization controller (PC) in the Sagnac interferometer. During the whole tuning process, the laser output wavelength could be tuned from 1 540.3 nm to 1 581.2 nm with the output power flatness better than 2 dB, 3 dB spectral linewidth narrower than 0.1 nm and optical signaltonoise extinction ratio higher than 45 dB.
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ZHOU Yingwu, LUO Zhizao. Thermally Expanded Core Fiber Based MZ Filter and Its Application in Widely Tunable Erbiumdoped Fiber Laser[J]. Acta Photonica Sinica, 2013, 42(12): 1482
Received: Apr. 22, 2013
Accepted: --
Published Online: Dec. 16, 2013
The Author Email: Yingwu ZHOU (ywzhou1073@sina.com)