Stable narrow linewidth operation of an erbium fiber ring laser using an intracavity etalon formed from chirped Bragg reflectors

Summary form only given. Single-frequency erbium fiber and lasers are attracting interest. One way of forcing narrow linewidth operation from this type of laser is to use a pair of integrated fiber etalons. 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. Fiber Bragg reflectors have been used to form "continuous-fiber" etalons and we describe the use of such an etalon to eliminate longitudinal-mode hops in an "all-fiber" narrow linewidth ring erbium doped fiber laser.