Longitudinal mode control of an erbium ring fibre laser containing an intracavity chirped Bragg grating etalon

Abstract We present preliminary data which show that it is possible to prevent longitudinal mode hops in a unidirectional erbium ring fibre laser by including an all fibre etalon formed from chirped fibre Bragg reflectors. A reduction in the relative intensity noise of ∼ 10 dB is observed when the laser is frequency stabilised. A resolution limited linewidth of 170 kHz is observed from the laser.