Robust electrically tunable 1.5 μm mode-locked fiber-external-cavity laser

We demonstrate a robust, broadly tunable pulse source operating near 1.55 μm wavelength consisting of a silica fiber external cavity coupled to an antireflection-coated InGaAsP two-section distributed-Bragg-reflector laser. The laser is actively mode locked at a repetition rate of 1.92 GHz to produce nearly transform-limited pulses with full width at half-maximum as low as 24 ps and can be electrically tuned over a wavelength range exceeding 8 nm.