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Description:
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Linear tuning the frequency of an erbium -doped fiber ring laser using both a Fabry -Perot filter and an electro -optic tunable filter has been experimentally demonstrated . The rate of frequency change is determined by monitoring the fringes produced by laser light transmitted through a fiber Fabry -Perot interferometer . The fiber ring laser has been tuned over a 50 nm spectral range when using the Fabry -Perot filter and a tuning rate of 16480 nm /s has been achieved . The spectral width of the laser is 0 .049 nm and the nearest sidelobe to the main peak is more than 30 dB below the central lobe . When the electro -optic tunable filter is used , a spectral range of 11 nm is reached . The spectral width is 2 .33 nm and is in close agreement with the filter theoretical results . The sidelobe to main peak difference is around 13 dB . |