Abstract
We report on the mode-hop-free operation of a distributed Bragg reflector (DBR) diode laser with an external cavity consisting of an optical fiber. A simple method is implemented, using feedback to the DBR drive current, to suppress mode hops due to frequency mismatch between the intrinsic mode of the DBR laser and the resonant mode of the fiber cavity. The error signal is derived from the change in the output power of the whole system. The feedback allows long-term operation over hours without mode hops, as well as continuous frequency scans of about 1 GHz with a reduced short-term linewidth.
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