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We experimentally demonstrate a switchable dual‐wavelength passively Q‐switched pulsed operation in an Erbium‐doped all‐fiber ring laser utilizing the nonlinear polarization rotation technique.At a low pump power of 25 mW, Q‐switched pulse train possessing a temporal repetition rate of 12.7 kHz as well as a pulse width of 8.4 μs is generated stably with dual wavelengths centered at 1569.92 nm and...
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