Abstract
Single-frequency erbium fiber and lasers are attracting interest for remote sensing and wavelength-division multiplexed applications. One way of forcing narrow linewidth operation from this type of laser is to use a pair of integrated fiber etalons.1 One etalon defines the oscillating wavelength, the other is used to stop longitudinal-mode hops. These etalons are the integrated-optic equivalents of bulk devices requiring the light to exit the cavity fibre so that it can traverse the etalon.2 Fiber Bragg reflectors have been used to form "continuous-fiber" etalons3 and we describe the use of such an etalon to eliminate longitudinal-mode hops in an "all-fiber" narrow linewidth ring erbium fiber laser.
© 1996 Optical Society of America
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