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AssigneeKorea Research Institute of Standards and Science, Republic of Korea
InventorsHo Suh, Han Moon, Won Lee, Han Ryu, Seon Kang
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Provided is a fiber ring laser capable of obtaining a back-up laser light and standard light having a wavelength continuously tuned in a single mode with equal spacing of 12.5 GHz, 25 GHz, 50 GHz or 100 GHz recommended by ITU-T Recommendation G. 692 & G. 694.1 in a C-band and an L-band using a fiber tunable etalon filter, an air gap etalon filter and a saturable absorber in an optical fiber laser resonator having a serial ring shape using a C-band optical amplifier and an L-band optical amplifier. The fiber ring laser can generate laser light having a wavelength tuned by more than 70 nm, excellent output power flatness and a source spontaneous emission ratio of more than 70 dB in 361 channels with equal spacing of 25 GHz by applying a bias voltage to a voltage-operated piezoelectric element of a tunable etalon filter. A single longitudinal mode operation of the fiber ring laser can be obtained by using a saturable absorber serving as a narrow-bandwidth filter.
A discretely ITU-T channel grid wavelength tunable single longitudinal mode erbium-doped fiber ring laser, which is fabricated to discretely tune a channel wavelength satisfying ITU-T grid channel value of 193.1 THz±n*12.5 GHz (n is an integer) specified by ITU-T Recommendation G.692 and G694.1 in a C-band and an L-band in a discrete wavelength tunable single longitudinal mode ring type optical fiber structure, wherein first and second erbium-doped optical fibers that are saturable absorbers having first and second optical fiber amplification stages having a unidirectional structure, an air gap etalon filter having an air gap, a fiber wavelength tunable etalon filter, and a saturable absorber composed of an erbium-doped optical fiber are serially connected with one another such that they can be simultaneously used.
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