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We present a novel and efficient L-band wavelength-tunable Er~ 3+ doped fiber laser of ring structure.In the cavity two segments of Er~ 3+ doped fiber and a fiber Bragg grating are used to improve pump efficiency.Tunable filters based on fiber loop mirrors are also applied inside the cavity to act as both a wavelength selector and a line-width compressor.Using these techniques,a tunable laser with tuning range up to 42 nm,output power larger than 1 mW,power uniformity controlled within 1.75 dB and side mode suppression ratio about 40 dB is achieved.
We present a novel and efficient L-band wavelength-tunable Er ~ 3 + doped fiber laser of ring structure. In the cavity two segments of Er ~ 3 + doped fiber and a fiber Bragg grating are used to improve pump efficiency. Tunable filters based on fiber loop mirrors are also applied inside the cavity to act as both a wavelength selector and a line-width compressor. Use these techniques, a tunable laser with tuning range up to 42 nm, output power larger than 1 mW, power uniformity controlled within 1.75 dB and side mode suppression ratio about 40 dB is achieved.